Ultimate Guide to Power Efficiency

The Nomad Power System

The product is the result of years and hours of research from one of the best engineers and power saving enthusiasts, it is a guide that will show you instructions on how to make your own power generator. In other words, it is going to show you how to assemble pieces to make a generator of electricity in order to save you power, money, and risk like Hank, the creator of the product had to go through. It is going to take very little time, roughly 3 hours and very cheap gear pieces to assemble in order to make the electricity generator:The Nomad Power System. It is a revolutionary product that is used by Hank's clients all over the world to help you save up on electricity bills. The power generator itself is very easy to build, requires very little experience and has its own instructions on how to build. It is also very safe to use as it has been tried by tens of thousands of people and has been tried by Hank, the power that it generates is even better than regular electricity and it will definitelycover all your need from multimedia devices to the AC to keep your house warm and cook your meals. Read more...

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Low Energy Electron Impact on Films of Passivated Nanoparticles

In contrast to the wealth of knowledge on SAMs of alka-nethiol molecules on planar metal surfaces, the nature of the adsorption of organic ligands on metal clusters is a relatively unexplored field 60, 61 . Moreover, the specific characteristics of the clusters, such as the shape, electronic structure, and surface reactivity derived from their limited size, may introduce new aspects to the interaction of the ligands with low energy electrons. The effect of electron impact on the organic shells of passivated metal nanoclusters is thus not only of relevance to practical e-beam writing but is also of fundamental scientific interest. Chen et al. have investigated films of gold particles, passivated with alkanethiol (octanethiol, C8H17S) ligands and deposited from a toluene solution onto the graphite surface, using high resolution electron energy loss spectroscopy (HREELS) 62 . A typical HREELS spectrum from this film (Fig. 1) shows vibrational modes of the CHx groups of the ligands,...

Nanotech Products For Architectural Energy Efficiency

The drive to make any Australian 'house of the future' as energy-efficient as possible is fuelled by the observation that current domestic and commercial buildings draw 6 and 12 respectively of Australia's total electricity generated 5 . A proportion of this is for heating water and for cooking, two areas which will not be further considered here, except to note that some improvements are possible by making greater use of thermal solar power and natural gas. A further proportion of the power is consumed for climate control and lighting and it is specifically these two items that can benefit from the application of nanotechnologies. The situation in other countries is broadly similar, and, for example, it has been stated that about one third of the energy consumed in the USA is used to heat, cool or light buildings 6 , Since the issue of staying warm in cold climates has already received much attention in the literature, the focus of the present paper will be on nanotechnological...

Hydrogen Interaction With Carbon Nanotubes

On the other hand Ma et al. first used a many body Tersoff-Brenner potential to simulate low energy collision of atomic H on the sidewall of an armchair (5,5) SWNT 28 . On top of this they performed minimal HF STO-3G ab initio calculations to some selected snapshots of the molecular dynamics simulations. The interesting part of their work is the sorting of the collision results with respect to the hydrogen energy. Their results indicate that if the hydrogen energy is in the range of 1-3 eV the H will be adsorbed in the tube sidewall while with a energy between 4 and 14 eV the H has large possibility to rebound off the wall. With energy in the interval of 16-25 eV the H has a high probability of penetrating into the tube and being trapped inside forming hydrogen molecules and gradually condensing to become liquid hydrogen inside the tube. Finally with an energy range from 20 to 30 eV the H atom can enter the tube from one side and escape from the other or break a C-C bond 28 .

Preparation of a NanoscaleSOFCGrade Yttria Stabilized Zirconia Material A Quasi Optimization of the Hydrothermal

The Institute of Nuclear Energy Research, CAEC, Lung-Tan, 325 Taiwan, ROC 8YSZ is a well-recognized material used as an electrolyte of a solid oxide fuel cell (SOFC). It consists of 8mol of Y203 and 92mol of Zr02 (zirconia). The basic requirements of yttria-stabilized zirconia (YSZ) for a good electrolyte are (1) to have good media for pure O transport, (2) to have zero electronic conduction, (3) to be porosity free to prevent gas from permeating, and (4) to be thin to minimize ohmic loss.1'2 The typical specifications of a commercial product of YSZ material and SOFC development at the Institute of Nuclear Energy Research (INER) were well summarized.3,4 It shows that the SOFC-grade YSZ material has characteristics of low particle size (nanoscale for electrolyte and submicrometer scale for an anode) and high thermal stability (100 cubic crystal structure). The

Research is needed for the European Construction Industry but it should help shifting existing paths towards

Enormous efforts remain consumption of resources needs to be drastically reduced, in buildings, during their construction and during materials processing. Also, if energy consumption of buildings could be reduced by 30 (which is easily achievable), the Kyoto objective of reducing CO2 emissions at the level of 8 could be achieved.

Cellular Nanomachines and the Building Blocks of Life

Proteins are nanoscale components that are essential in biology and medicine 1 . They consist of long chains of polymeric molecules assembled from a large number of amino acids like beads on a necklace. There are 20 basic amino acids. The sequence of the amino acids in the polymer backbone, determined by the genetic code, is the primary structure of any given protein. Typical polypeptide chains contain about 100-600 amino-acid molecules and have a molecular weight of about 15,000-70,000 Da. Because amino acids have hydrophilic, hydrophobic, and amphiphilic groups, they tend to fold to form a locally ordered, three-dimensional structure, called the secondary structure, in the aqueous environment of the cell this secondary structure is characterized by a low-energy configuration with the hydrophilic groups outside and the hydrophobic groups inside. In general, simple proteins have a natural configuration referred to as the a-helix configuration. Another natural secondary configuration...

Mechanism of Electron Beam Writing in Passivated Nanoparticles

When the incident electrons impinge on the nanoparticle film, they experience many small angle scattering events (forward scattering) and propagate through the cluster film into the substrate. Here the electrons occasionally undergo large angle scattering events and may thus return to the cluster film (possibly at some distance from the incident beam), causing additional resist exposure. The electron backscat-tering probability depends on the substrate material low atomic number materials give less backscattering. Like the primary electrons, the backscattered electrons can also generate secondary electrons, with energies less than 50 eV. The cross-section for bond breaking is generally large for these low energy electrons.

About the Contributors

Wiesner, Ph.D., is a professor of Environmental Engineering at Duke University where he holds the James L. Meriam Chair in Civil and Environmental Engineering. His work has focused on applications of emerging nanomaterials to membrane science and water treatment, and an examination of the fate, transport, and effects of nanomaterials in the environment. Before joining the Duke University faculty in 2006, he served on the Rice University faculty for 18 years in the Departments of Civil and Environmental Engineering and Chemical Engineering, and as director of the Environmental and Energy Systems Institute. He is a co-founder of the Houston-based nanomaterials company Oxane Materials. Dr. Wiesner holds a B.A. in Mathematics and Biology from Coe College, an M.S. in Civil and Environmental Engineering from the University of Iowa, a Ph.D. in Environmental Engineering from the Johns Hopkins University, and has completed postdoctoral training at the cole Nationale Sup rieure des...

Plethora of Potential Applications

Nanotechnology will enable manufacturers to produce computer chips and sensors that are considerably smaller, faster, more energy efficient, and cheaper to manufacture than their present-day counterparts. Specifically, nanotechnology is now giving rise to many new applications such as quantum computing, surface and materials modification, novel separations, sensing technologies, diagnostics, and human biomedical replacements.

Automobiles and Aeronautics

Planes, trains, and automobiles will be lighter, faster, and more fuel-efficient and constructed of lighter, stronger materials. Some of these lightweight materials will include aluminum bodies for automobiles, brake systems for high-speed trains, and quieter aircraft engines. The stronger, lighter materials will help in energy efficiency and reducing mass and weight of finished products. See Chapter 6 for more information about automobiles and aircraft.

Sensors and Spacecraft Components

NASA's challenge to detect ultra-weak signals from sources at astronomical distances make every photon or particle a precious commodity that must be fully analyzed to retrieve all of the information it carries. Nanostructured sensing elements, in which each absorbed quantum generates low-energy excitations that record and amplify the full range of information, provide an approach to achieve this goal. NASA will also develop field and inertial sensors with many orders of magnitude enhancement in the sensitivity by harnessing quantum effects of photons, electrons, and atoms. A gravity gradiometer based on interference of atom beams is currently under development by NASA with the potential space-based mapping of the interior of the Earth or other astronomical bodies. Miniaturization of entire spacecraft will entail reduction in the size and power required for all system functionalities, not just sensors. Low-power, integrable nano devices are needed for inertial sensing, power generation...

Multifunctional and Smart CNTs Reinforced Cement Based Materials

Cement-based materials reinforced with low concentration of CNTs. A key problem related with this issue is to find a simple, repeatable, large-scale and low-energy consumption method for distributing CNTs in cement-based materials without altering the manufacturing process of cement-based materials. It is necessary to develop a simple and convenient evaluation method of dispersion quality of CNTs. In addition, it is suggested that the subsequent studies should be aimed at establishing the optimum CNTs' types and CNTs' concentration values as the mix design parameters.

Vibrational Spectroscopies

Of poor resolution, and therefore vibrational spectroscopy is impossible. At the same time, though poor in resolution, the features of inner shell excitation are useful in identifying the elemental constituents and nature of binding of materials at the nanometer regime. At lower excitation energies of the order of a few eV, the electron beam has a very narrow energy width, of the order of 1 meV or less, which allows the use of vibrational spectroscopy. This is normally performed on adsorbate molecules which are present on the surface at monolayer coverages. Because of this fact and also due to the fact that electrons are used, HREELS is done in ultra high vacuum. Due to the extreme surface sensitivity of the low energy electrons, the technique looks at the top monolayer only. In HREELS, one can observe low energy vibrational excitations, such as those representing the adsorbate-surface interactions. These are necessarily low energy vibrations as their force constants are small and the...

Current Status of Nanotechnology in Construction Desk Study

In Europe, an analysis of Eols (expression of interest) submitted to the EC FP6 in 2002 found that there were 20 Eols related to the nanotechnology application in construction. The analysis was based on results published on the E-Core (European Construction Research Network) database which had a total of 250 Eols related to construction applications. The Eols covered a wide range of interests activities, namely understanding & modelling of phenomena at nanoscale, developing nanoscale particles, tubes fibres & nanostructure modified materials components, functional materials, thin films & coatings paints, energy efficient devices, and smart materials & integrated systems incorporating nano sensors actuators.

Microstructure of Nano Sheets of Austenite In Carbide Free Lath Martensite

3.3.2 Functional Coatings and Thin Films. Incorporating certain nanoparticles into transparent coatings thin films can provide enhanced performance and additional functionalities. Currently, several products have been developed and marketed for construction and the built environment, including hard, protective or anti-corrosion coatings for components self-cleaning, thermal control energy saving, anti-reflection coatings for glass windows easy-to-clean, anti-bacteria coatings for work surfaces (i.e. for kitchens, bathrooms, and door handles, etc.) and more durable paints and anti-graffiti coating for buildings structures. Furthermore, nanostructured coatings can be used to selectively reflect and transmit light in different wavebands. These coatings can be produced by either using nanoparticles or forming multiplayer thin films metals and dielectrics.26 These coatings can be used on windows as radiant heat reflectors, with many energy saving applications. There are also coatings...

Experimental Facts for Growth Models

Years of study on the growth of catalyst-grown carbon fibers suggested that growth occurs via precipitation of dissolved carbon from a moving catalytic particle surface 8 . Growth terminates when the catalyst particle gets poisoned by impurities or after the formation of a stable metal carbide. The reason put forward for the tubular nature of carbon fibers is that it is energetically favorable for the newly-formed surface of the growing fiber to precipitate as low-energy basal planes of graphite rather than as high-energy prismatic planes. However, the curving of the graphite layers introduces an extra elastic term into the free-energy equation of nucleation and growth, leading to a lower limit ( 10nm) to the diameters of carbon fibers that can form from curved graphite layers 9 . This implies that to explain the growth of carbon nanotubes, where diameters can be much smaller than this threshold value, new mechanisms have to be considered. There are, however, some notable differences...

Hydrogen Bridge Bonds

The individual hydrogen bond is of relatively low energy, distributing only a weak contribution to the overall energy. In addition, it is easily cleaved. However, several hydrogen bonds between two molecules can stabilize the created aggregate significantly by inducing a cooperative binding.

Mechanical Flexibility of Organosiloxane Based Organic Inorganic Hybrid Nanocomposites

Dimethysiloxane is effective for further decrease in Young's modulus, reaching rubbery regions (106-107 Pa) 19, 24, 44, 45 . The rotation energy of the Si-O bond of PDMS chains is low because the Si-O bond has longer bond-distance and lower electron-density than the C-C bond. The bond angle of O-Si-O is the same as that of C-C-C, but the bond angle of Si-O-Si is larger than that of C-C-C as shown in Fig. 4.3. In addition, since the Si-O bond has an ionic character of 50 , the bond angle of O-Si-O is easily varied with low energy. Thus, it is very easy for PDMS chains to move and bend. PDMS chains are bulky because two methyl groups are bonded to a Si atom. PDMS chains vibrate with relatively large amplitude. Thus, it is difficult for PDMS chains to approach each other. That is, the intermolecular forces or cohesive forces of PDMS chains are low, the distance among PDMS chains is large, and the

Growth from the Gas Phase

The growth of monolayer from the gas phase in UHV allows one to study the process by using various in-situ measurements. The study by low energy electron diffraction (LEED) shows that the first phase, occurring immediately after dosing with the adsorbent molecule, is the stripped phase. On continued deposition, the structure changes to the standing phase with C (4X2) lattice.

Band Structure of Carbon Nanotubes

A remarkable feature of the single-walled carbon nanotubes is that their conduction properties depend on the helical arrangement of the hexagonal carbon rings on the tubular structure. Thus, carbon nanotubes can be metallic or semiconducting as a consequence of their particular geometry and, when a gap develops in the low-energy spectrum, it also depends on the diameter of the nanotube. These properties follow from the band structure of the tubular arrangements, which is composed of a certain number of one-dimensional subbands depending on the thickness of the nanotube. The conducting properties can be formally ascertained by addressing the question of whether the Fermi level crosses or not some of the subbands. The prediction of the metallic and semiconducting properties of the nan-otubes depending on their geometry was actually made on theoretical grounds in 1992 18-20 . Although the electronic properties of the nanotubes had been studied for some time, it was not until 1998 that...

Nanoelectronics and Sensors

And a simultaneous local e-beam-induced irradiation and annealing in a tunneling electron microscopy (TEM) setup causes the two nanotubes to form a spot weld junction at the contact point. Both T- and Y-junctions of the single CNTs, as shown in Figure 2.18, have been fabricated with this approach. The formation mechanism of such T- junctions via an all graphitic (sp2)-type low-energy bonding pathway has been investigated recently and gives the activation energy for the formation pathway to be between 5 and 8 eV, which is not too high for an e-beam- or ion beam-induced process 125 . The intrinsic nature of the rectification behavior of the Y junctions has also been investigated 126,127 , and it has

As Single Electron Transistors

Expression AE hvF 2L (or AE hvF 4L if the degeneracy between the two different low-energy modes in the metallic nanotubes has been lifted). Altogether, the energy needed to add an electron to the island is the sum of the two contributions, the so-called addition energy 67

Magnetic Resonance Imaging MRI the Basics

Objects to be imaged are exposed to a strong magnetic field and a well-defined radio frequency pulse. The external magnetic field (B0) serves to loosely align protons either with (lower energy level) or against (high energy level) the field, the difference between the two energy levels being proportional to B0. Once the protons are separated into these two populations, a short multi-wavelength burst (or pulse) of radio frequency energy is applied. Any particular proton will absorb only the frequency that matches its particular energy (the Larmor frequency). This resonance absorption is followed by the excitation of protons from the low to high energy level and of equivalent protons moving from high to low energy levels. After the radio frequency pulse, protons rapidly return to their original equilibrium energy levels. This process is called relaxation and involves the release of absorbed energy. Once equilibrium is again established, another pulse can be applied.

Double Quantum Dotsartificial Molecules

Figure 47a shows the total potential for the empty double-dot in the plane of the heterointerface for Vt -0.67 V obtained by LSDA-based computer simulations. The two dot regions are visible as depressions in the region 4000 A < x < 8000 A and 2500 A < y < 4200 A. The potentials in the dots are parabolic at low energy as seen more clearly in Figure 47b, which shows the potential along x , the direction of coupling of the two dots for two values of Vt. For Vt 0.67 V, hereafter referred to as the weak-coupling regime, the interdot barrier (A67 in Fig. 47) is 4 meV, while for Vt 0.60 V (i.e., the strong coupling regime), the

Why Nanoscience is Relevant to the Solar Energy Industry

An understanding of the general characteristics of fundamental energy carriers is important in appreciating the connections between nanotechnol-ogy and energy. Table 1.1 summarizes the characteristic length and time scales for energy carriers in liquids, gases, and solids. These scales define the space-time envelope within which, if accessible, the manipulation of matter should critically affect the energy carrier transport and conversion processes, thereby enabling drastic improvement in the performance of energy systems 10 .

Proteins make for finer filters

Membrane interfaces are unsung heroes of the modern world. They permeate its every aspect, yet they rarely get the spotlight. The basic concept is deceptively simple a membrane barrier allows some molecules to pass through it while stopping others. Membranes provide one of the most energy-efficient ways to separate chemical species on the basis of size, charge or chemical properties. Modern industrial membrane technology, dominated by polymer membranes, is used in applications as diverse as dialysis for kidney patients and the supply of clean drinking water. The market for membranes is worth billions of dollars per year, but there is still plenty of scope for

Geometry and Surface Structures of Supported Nanostructures

To reveal the interplay of various factors, we performed a systematic study, mainly using in situ ultrahigh vacuum (UHV) STM, combining with Auger electron spectroscopy (AES) and low-energy electron diffraction (LEED), on the nucleation and growth, shape, and surface atomic structures of nanostructures on highly oriented pyrolytic graphite (HOPG) 43,44 and silicon nitride (SiNx) thin films obtained by thermal nitridation of Si 45-47 . Much previous research work has been carried out with (mostly ex situ) scanning electron microscopy (SEM), cross-sectional transmission electron microscopy (TEM), and X-ray scattering 3-5,8,29,34,48 . Although each of these techniques offers certain strength, UHV STM is unique in providing atomic-resolution surface structural and other geometric information of nanostructures under a well-controlled environment. Of course, STM normally can only image the top surface of an object, so investigations using STM and other techniques should be complementary to...

Electron Beam Lithography And Nanotechnology

It is a well-known fact that microelectronics has advanced at exponential rates during the past four decades. Due to its rich functionality in applications, low energy consumption in operations, and low cost in fabrication, microelectronics has entered into almost all aspects of our lives through the invention of novel small electronic devices. The most important advancement is the extension of microelectronics and its fabrication methodology into many non-electronic areas such as micro-actuators, micro-jet, micro-sensors, and micro DNA probes. In EBL nanofabrication, working conditions at which electron scattering causes minimal resist exposure is required. To achieve this goal, either very high energy or very low energy 8 electrons are used. In high-energy case, the beam broadening in the resist through elastic scattering is minimal 5 and the beam penetrates deeply into the substrate. Low energy electron approaches are effective because the electrons have too low an energy to...

Conclusions and Future Outlook

The shape of 3-D nanoparticles is nearly spherical when they are small. The spherical shape can be maintained for Sb and Ge crystallites up to quite large size (consisting of > 106 atoms). Such faceting threshold sizes, beyond which crystalline facets appear on nanocrystal surface, are significantly bigger than those of many metallic crystallites 8,34,36,131 , including Al in our study. The electronic energy factor, which favors spherical shape, should be insignificant in this size range. We believe that the key factor here is the surface energy of a nanoparticle that, due to limited size, can take very different values than that of macroscopic surfaces.

Miscellaneous Applications

The velocity of electrons approaching the speed of light (3 x 108 ms-1) in vacuum is limited to only a saturation velocity of 105 ms-1 in solids by lattice scattering thus, making vacuum electronic devices attractive for high speed and high frequency applications 262 . Conventional vacuum electronic devices use electrons liberated by thermionic emission from hot filaments that are large and need much energy in heating up the filament. So, replacing the thermionic cathode by a cold cathode (uses field emission, FE, electrons where the electrons are liberated by tunneling from the cathode material at room temperature under intense electric field) can reduce the size of the device and also improve the power efficiency. Cold electron FE materials, with low threshold fields, are seen as potential candidates for flat panel displays (FPD). Some of the novel cold field emission materials include metallic-dielectric nanocomposites such as resin-carbon coatings 263, 264 graphitic clusters...

The Korean connection

So who out there in the real world is set to answer consumer demand for high-resolution, energy-efficient, lightweight display equipment How about Samsung The Korean electronics giant prominent as a maker of display screens has incorporated carbon nanotubes into a working color screen. As in a traditional television (the big, bulky kinds), the carbon nanotubes shoot electrons at phosphors on a glass screen. (A phosphor is any material that emits visible light when exposed to radiation the red, green, and blue colors that you see on your screen.) Unlike traditional TV picture tubes, Samsung's color screens are thin, lightweight, and don't use much power.

Electron Correlations and Luttinger Liquid Behavior

It has been known for decades that electron-electron interactions are of paramount importance in 1D metals 30,31 . As a result, electrons form a correlated ground state called the Luttinger Liquid (LL), which is characterized by some exotic properties such as low-energy charge and spin excitations that propagate with different velocities, and a tunneling Density of States (DOS) that is suppressed as a power-law function of energy, i.e., p(E) < x E EF a. SWNTs are truly 1D conductors and thus are expected

Hybrid Organicinorganic Materials in Electrochemical Supercapacitors

Hybrid nanocomposite materials can provide the added activity of the inorganic clusters in electrochemical supercapacitors. This option represents a different (and complementary) approach to batteries for the storage of charge, based on interfacial processes, and allow for higher power density but lower energy density than batteries. Originally, supercapacitors harnessed double-layer charge storage on the interface between microporous carbon materials and suitable electrolytes in a purely electro-physical capacitive mechanism, but more recently electrochemical supercapacitors are leading the way toward higher specific energy systems. These are based on redox-active materials able to cycle repeatedly between two oxidation states and therefore represent an approximation between traditional supercapacitors and batteries. Current research in electrochemical supercapacitors has been carried out with emphasis on the development of new electrode materials. In this line of work, we can find...

Of Mechanical Molecules And Nanodevices

Upon formation of urethane there is an increase in the periodicity of hindered rotation, and as a result the molecule is trapped in an excited state affording a new low energy position that is now higher in energy. Figure 10. Upon formation of urethane there is an increase in the periodicity of hindered rotation, and as a result the molecule is trapped in an excited state affording a new low energy position that is now higher in energy.

Electron Specimen Interactions in Homogeneous Materials

Low energy electron microscopy (LEEM) may be applicable here if clean surfaces are examined in ultra-high vacuum SEM 33 . In most practical applications, however, this condition will not be met. The drastic reduction in the interaction volume provides many advantages of using low-energy electron beam techniques to characterize a plethora of materials including semiconductor devices and nanoparticles. With low-energy electrons, we can perform high spatial resolution microanalysis of bulk samples we can reduce the

Electron Specimen Interactions in Composite Samples

Easily observed in BE images obtained with 30-keV electrons (Fig. 4f) since the electron backscattering coefficient for the particle-carbon composite sample (np 0.05) does not change appreciably from that for pure carbon. If 3-keV electrons are used (Fig. 4e), this Pt particle, however, can be easily observed with a contrast of about 62 since now np 0.42, much larger than that of pure carbon. Electron interactions with composite samples are complicated, especially when low-energy electrons are used. The interaction processes of low-energy electrons also critically depend on the size of the Pt particle. For example, although 3-keV electrons cannot penetrate through a Pt particle with a size of 50 nm in diameter, electrons scattered to high angles by the Pt particle can exit the particle surface and strongly interact with the carbon substrate.

Measurement Of Mean Inner Potential And Sample Thickness

Where H is the volume of the region over which the integral is evaluated. V0 is proportional to the second moment of the atomic charge density and can be calculated from its mean square radius 84, 85 . Exchange and correlation contributions to the potential are negligible for high-energy electrons 86 , and the measured mean inner potential can be regarded as a basic property of the material and not of the electrons that are used to probe it. For low-energy electrons, exchange and correlation effects cannot be neglected, and the mean inner potential varies with the energy of the incident electrons 87-89 .

Multicomponent Dynamics

Another application of MD techniques is to search for low energy configurations of the system. Based on the ergodic hypothesis, if one assumes that the system can be modeled as a set of oscillators of incommensurate frequencies, a dynamical trajectory will eventually (given sufficient time) sample all of the energetically accessible configuration space. One problem with this method is that in order to sample the whole potential energy surface, an impractically long simulation time is necessary. Typically only the local area around the starting point is sampled 107 . In the event of commensurate vibrational frequencies, resonances occur and the ergodic hypothesis breaks down. Another difficulty with MD

Energy generation and storage

In Germany the development of III V-semiconductor solar cells for space applications is promoted by the DLR and accomplished in a joint project with participation of the Fraunhofer Institute for Solar Energy Systems and the RWE Solar AG. The production of multi junction solar cells with MOCVD and MBE procedures requires process control on a nanoscale level. Disadvantages of III V semiconductor solar cells are relatively high material costs and a complex process technology. Regarding the employment of nanomaterials, in particular electrochemical sensors are concerned. Miniaturized electrochemical gas sensors with sensitive metal oxide coatings (e.g. SnO2) are energy saving and can be easily integrated into CMOS circuits. The use of nanopowders for sensor and electrolyte coatings offers in principle advantages both regarding the production process (reduced sintering temperatures, which allow co-firing of metals and ceramics) and the sensitivity and robustness of the sensors by improved...

How did you and Professor Fisher develop a technique to grow individual carbon nanotubes vertically on top of a silicon

Growing carbon nanotubes vertically on a silicon wafer may be a new way of constructing future microchips that are much faster to make and more energy efficient than conventional chips. Stacking the components on top of each other also cuts the distance and the time an electrical

Small Particle Contrast in High Resolution BE Images

Figure 11b shows the dependence of n(d) on the size of a Pt particle at different electron energies. With low-energy electrons, a smaller Pt particle may have a higher intensity at the center of the particle than that of a larger Pt particle. For example, a 20 nm Pt particle will give a maximum contrast in BE images obtained with 4 keV electrons while both smaller and larger particles will give a lower image contrast. With

Planetary Milling Machines

Specific attention has been paid to the in-situ study of the mechanically injected power during mechanosynthesis 55 . Magini et al. 55 have, for instance, clearly shown that the power consumption due to the milling action can be revealed by suitable electrical power measurements. In the case of single path cumulative reaction, the only factor governing the progress of the reaction is thus found to be the energy consumption during milling. Modifiyng the milling parameters but absorbing the same energy will lead to the same end product.

Milling Induced Vial Heating Milling Temperature

In the case of experimental work performed by Xu et al. 73 studying the deformation-assisted decomposition of an unstable Fe50Cu50 solid solution during low energy ball-milling, the experimental results are interpreted in terms of an effective-temperature model which has been adapted from former models applied to irradiated alloys.

Summary And Perspectives

At high electron energies, nanometer or subnanometer resolution SE images can now be routinely obtained in the new generation FEG-SEM instruments. To achieve the same image resolution at low electron energies, however, is still very challenging. As we discussed in section 3, both Cc and Cs aberration correctors have to be used to significantly reduce the effect of spherical and chromatic aberrations on the formation of low-energy electron nanoprobes. Such an attempt has already resulted in significant resolution improvement 39 . The use of aberration correctors not only makes the obtainable probe size much smaller but it makes possible to obtain high beam current contained within a small nanoprobe high total beam current provides adequate For some samples, high probe current may be detrimental due to electron-beam induced irradiation damage of the sample low probe current, however, usually results in poor signal-to-noise ratio and thus poor image or spectrum quality. Development of...

Supporting Technologies 41 Resist

Because EUV light is attenuated in air, it will be necessary to keep the beam path in vacuum (P > 10-8 torr), although it is probably not practical to maintain ultrahigh vacuum conditions (P < 10-9 torr) inside of the EUVL tool. Long-term exposure of the reflective coatings to EUV light, and in particular under conditions where gaseous species in the ambient may react with, or condense on, the coating, is a serious concern. One mechanism for degradation of the coating reflectance is enhanced oxidation of the Si-terminated Mo Si surface 115 . It has been suggested that low-energy secondary electrons created by exposure of the Si-terminated Mo Si to EUV light could interact with water molecules from the environment to enhance oxidation of the surface 24, 116 . Terminating the Mo Si with a thin Ru film on the surface shows promise for hindering surface oxidation with a minimal impact of the EUV reflectivity from the Ru layer 24 .

Vision Statement Interacting Brain

Brain functional studies are currently performed by several instruments, most having limitations at this time. PET and SPECT use labeled glucose as an indicator of metabolic activity however, they may not be used within a short time interval and also can be expensive. MRI is a versatile brain imaging technique, but is highly unlikely to be wearable. MEG is an interesting technology to measure axon-derived currents with a high accuracy at a reasonable speed this still requires minimal external magnetic fields, and a triply shielded micro-metal cage is required for the entire subject. While thermography has some advantages, the penetration is very small, and the presence of overlying tissues is a great problem. Many brain responses during cognitive activities may be recognized in terms of changes in blood volume and oxygen saturation at the brain part responsible. Since hemoglobin is a natural and strong optical absorber, changes in this molecule can be monitored by near infrared (NIR)...

Getting Nanotechnology Right the First Time

Nanotechnology - the design and manipulation of materials at the molecular and atomic scale - has great potential to deliver environmental as well as other benefits. The novel properties that emerge as materials reach the nanoscale (changes in surface chemistry, reactivity, electrical conductivity, and other properties) open the door to innovations in cleaner energy production, energy efficiency, water treatment, environmental remediation, and 'light-weighting' of materials, among other applications, that provide direct environmental improvements.

Life cycle inventory analysis

Total primary energy consumption (MJ m2 coated aluminum automobile surface area)57 Table 18. Total primary energy consumption (MJ m2 coated aluminum automobile surface area)57 The total primary energy consumption is primarily determined by the energy requirement of the application and includes not only the actual coating process but also energy expenditures for drying, etc. The differences here in the variants studied are minimal. The roughly 35 less total primary energy consumption of the nanocoating results is due to reduced quantity of coating material. However, during the use phase, the reduced mass also leads to savings in fuel consumption. Fig. 15. Total primary energy consumption (MJ m2 coated aluminum automobile surface area)60

Oxygen Electroreduction Reaction on Carbon Supported Platinum Catalysts

Due to the existence of kinetic, mass transport, and design limitations, fuel cells do not operate at equilibrium (Jarvi et al. 1998). The cathode reduction reactions are initiated at potentials lower than their equilibrium potential, and the oxidation reactions at the anode are initiated at potentials higher than their equilibrium potential. The shift in potentials at the cathode and anode are named cathodic and anodic overpotentials respectively. Because of these shifts, there is a decrease of the potential difference across the fuel cell. Therefore its electrical efficiency, defined as the actual potential difference divided by the equilibrium potential difference, is diminished (Jarvi et al. 1998). The standard reversible potential for O2 reduction is 1.23 V on the hydrogen scale (Bard et al. 2001). However, due to the aforementioned effects the fuel cell cathode has a working potential of around 0.8 V (Anderson 2002), so that its overpotential is around 0.4 V (Adzic 1998)....

Casestudy Summary

Due to differing stages of development of the technologies under investigation, the resulting eco-efficiency potential assessments come with a certain degree of uncertainty. In the overall product life cycle, the manufacturing phase is responsible for an ever increasing share of the environmental impacts. The successful implementation in mass production of the material and energy efficiency increases offered by OLEDs will make it possible to realize significant eco-efficiency potentials. At the very least, a 20 savings in energy as compared to LCDs over the entire product life cycle should be possible.

Player business sustainable nanodesign in research and development

In environmental product design, the entire product life cycle becomes an object of the design process. The consequences of alternatives in the stages of raw materials procurement, manufacture, use, and disposal of products are weighed one against the other and compared to other design requirements. Environmental product design implies a greater responsibility on the part of the designers and design engineers. In the design process, right from the start, material and energy inputs, emissions (air, water, waste), minimization of risks and pollutants, as well as product service life and usage, are all looked at and considered over the entire product life cycle. In addition to traditional requirements, goals such as extending useful service life, improving material and energy efficiency, minimizing risks, and improving recyclability are therefore likewise a part of the product development focus.

Variant 1 the cathoderay tube CRT

Due to their construction, CRTs are very heavy as compared to other display technologies, require a lot of space, and are characterized by high energy consumption. Image quality is also negatively affected by screen burn-in, which occurs when a fixed image is displayed over a longer period of time. The advantage they offer over other display technologies is their considerably lower price. the displays and their low energy consumption (see Nocula & Olbrich 2003 and others). mixtures. Charged electrons create tiny gas explosions which cause short-term changes of the aggregate state from gas to plasma. The resulting ultraviolet radiation generates - depending on the coating of the rear and lateral sides of the cell - red, green and blue light via the phosphors. This phosphorescent light is visible as a pixel through the front panel. The process of light generation is similar to that of the fluorescent tube, but on a much smaller scale, with the result that the energy efficiency of the...

Applications of quantum dots

Direct-charge injection In direct-charge injection, electrons in the quantum dots are brought into the excited state by the transport of electrons or electron voids and the resulting collision processes. Research on this method is taking place at the Massachusetts Institute of Technology (MIT, Cambridge) and elsewhere in 2003 they succeeded in making a major step forward in development. The problem in direct-charge injection is to stimulate as many of the electrons flowing through the carrier material as possible to electron excitation in the quantum dots and thus light production. MIT researchers were able to augment the efficiency of direct-charge injection by a factor of 25 by placing CdSe dots (cadmium selenide) between two organic layers (Riebeek 2003). With this technology an efficiency increase of up to 100 (all injected charges generate light) may be possible, more than with any other light source. This would raise the energy efficiency of light sources to a new dimension. The...

Selecting an Environmental Ethic

For those that intend to manipulate nature in the place that environmentalists tend to assume it belongs, namely leaning towards the moral value of the historical evolutionary process. While there are a host of problems in determining just how high that burden of proof will be, the intuition about the value of non-humanized and naturally evolved nature is a useful reference point. And in fact, many proponents of nanotech-nology may be sympathetic to portions of this ethic. Nanotechnology is often advocated for its potential environmental benefits, benefits such as pollution detection, hazardous waste clean-up, and energy efficiency. Those benefits are often measured in terms of their ability to help us protect the evolutionary and ecological values discussed. Both nano-advocates and those that protest the development of nanotechnology seem often to have the same environmental intuition in mind.

Early Age Strength Increase of Belite Cement

Belite cement is a environment friendly (reduce CO2 addition) and energy efficient cement and offers superior durability property. Although, long tern strength gain of belite cement is either comparable or even better than ordinary Portland cement, low early strength due to slow hydration rate is a limitation for its widespread use. Addition of nano-particles to accelerate belite hydration at early ages was studied by different researchers Dolado et al. 2007, Campillo et al. 2007 . Different nano-particles (e.g., nanotechnol) were added to belite cement and both the early age mechanical properties and microstructure modification were studied. The results showed that the addition of nanoparticles can overcome the drawback of this type of eco-friendly cements, which will enable them to be competitive to OPC.

Onchip cooling by superlatticebased thinfilm thermoelectrics

There is a significant need for site-specific and on-demand cooling in electronic1,2, optoelectronic3 and bioanalytical4 devices, where cooling is currently achieved by the use of bulky and or over-designed system-level solutions. Thermoelectric devices can address these limitations while also enabling energy-efficient solutions, and significant progress has been made in the development of nanostructured thermoelectric materials with enhanced figures-of-merit510.However, fullyfunc-tional practical thermoelectric coolers have not been made from these nanomaterials due to the enormous difficulties in integrating nanoscale materials into microscale devices and packaged macroscale systems. Here, we show the integration of thermoelectric coolers fabricated from nanostructured Bi2Te3-based thin-film superlattices into state-of-the-art electronic packages. We report cooling of as much as 15 C at the targeted region on a silicon chip with a high ( 1,300 W cm2) heat flux. This is the first...

Variant 2 Styrene synthesis with carbon nanotube catalyst

A new nanostructure catalyst consisting of multi-wall nanotubes will be used. This not only permits increases in styrene output, it also changes the procedure from an energy-intensive endothermic process to a more energy-efficient exothermic process. Additionally the new catalyst makes it possible to run the reaction by adding air instead of water. Moreover, at the same conversion rate selectivity can be increased and the process temperature lowered by 200 C, which significantly lowers the specific expenditure of energy. Reduction of the specific energy consumption by (at least) 1.2 MJ kg styrene assuming AH 124.9 kJ mol, Reduction of the specific energy consumption Reduction of the specific energy consumption, since production and processing of steam is very energy-intensive Reduction of the specific energy consumption for less distillation and recycling Replacement for heavy metals, no heavy metal contamination Detailed life cycle assessment data for the alternative styrene...

Directional Rotation and Oscillation

One well-known biological example is the bacterial flagellar motor, which provides many species of bacteria such as E. coli the power to swim through the directional rotary motion. It is generated by the successive protonation and deprotonation processes that induce the unbalance of the force balance that was set before the initial step. This force unbalance is rebalanced through the conformation changes, which generates the torque for the directional rotation and thus the power to swim. The asymmetrical packing of proteins seems to be critical for this torque generation and also to provide the guide motion. Another sophisticated example from biological systems is ATP synthase. This highly energy-efficient (nearly 100 ) biological motor uses ATP (adenosine triphosphate) or protons as energy sources. As ATP binds and is hydrolyzed on the specific sites of its surface or as proton fluxes, the asymmetrically packed (or assembled) rotary part of proteins changes its conformational...

Nanotechnology Here and

Nanotechnology has been making its presence felt in industry for some time, and many applications are already standard. Because of the current national debate regarding energy policy and oil, a perfect example may be petroleum refining. Zeolites, the molecular sieves discussed in Chapter 6, are now used to extract as much as 40 percent more gasoline from a barrel of crude than the catalysts they replaced. This technique was first developed by Mobil and by some estimates saves approximately 400 million barrels of oil per year (around 12 billion) in the United States alone. Because this approach has been used for many years, don't expect it to drive down your pump prices any time soon, though it did when it was first developed. Even so, zeolites do show how significant (and how understated) the use of nanotechnology can be. Displays have been a focal point of computer engineering for last few years. Slowly, clunky TV-like cathode-ray tubes (CRTs) have been replaced by flat-panel...

Building from the Bottom

Environmental issues associated with nanotechnology are currently, in winter 2005, the most prominent in the news, and 'environmental and safety issues' is becoming a standard discussion among the nanotechnology community. The public notice of these issues was most noticeably drawn by a Washington Post article in February 2004 (Weiss 2004) but other news has continued to keep the topic current. To some people, these are 'technical' issues, separate from social and ethical issues. To others, the inherently social process of identifying what constitutes a risk and what constitutes safety make these issues 'social and ethical' ones. Generally, nanotechnology proponents argue that making things much smaller will make them more energy efficient, thus reducing energy demands. Others argue that the presence of very tiny manufactured nano-particles in the environment may cause health problems associated with inhalation. Some people associated with nanotechnology have also ex

Sampling the Ethical Issues

On the other hand, since the promises and threats of nanotechnology are so multiple and varied, it also seems wise to evaluate them on a case-by-case basis. Better pollution sensors made possible by nanotechnology are hard for environmentalists to reject. Materials made out of carbon nanotubes that are 6 times stronger than steel and 100 times lighter make possible vehicles for transportation that would be vastly more energy efficient than current models. Nanobots that can descend into the depths of contaminated sites and neutralize the pollutants found there are an attractive prospect if safeguards are in place to prevent them from causing additional environmental harm of their own. All of these new technologies would make possible the preservation and restoration of habitat, which in turn might enable natural evolutionary processes to continue. In each case, the costs and benefits of a technology should be weighed in

Research and Development

Energy research needs more funding. Smalley had an idea for research to get a nickel for every gallon of oil product used in the U.S. That alone would generate 10 billion a year of extra research money for energy. The United States puts a boat load of money into energy production and distribution, as well as import, but not into energy research. Major investment would create a wealth of new technologies and could solve the energy problem by 2020.

California Nano Dreaming at Berkeley

As an example of the type of people who pursue nanotechnology at Berkeley, the Chair of the department, Professor Albert Pisano, also happens to be head of The Nanotechnology Steering Committee of the American Society of Mechanical Engineers. He's a big fish in the nanotech pond, having served as the Program Manager for MEMS for the Defense Advanced Research Projects Agency (DARPA). A researcher in the chemistry department, Paul Alivisatos, was the founding editor of Nano Letters, a scientific journal devoted to nan-otech research. (He's also scientific founder of Nanosys Inc., a startup specializing in nanomaterials.) Alivisatos is currently the director of Berkeley Lab's Molecular Foundry, one of five Department of Energy research centers.

Nanotechnology in Federal Labs

Federal laboratories in the Department of Defense are focused on developing ultrasensitive and highly discriminating sensors for chemical, biological, and nuclear threats. Revolutions in electronics, optoelectronics, and photonics devices for gathering, protection, and transmission of information are critical for DoD's missions. The goal of Army Research Lab in its nanotechnology efforts is to reduce the weight carried by individual soldiers without losing any functionality. DOE national laboratories serve the agency's missions related to both basic and applied energy research as well as national security. The DOE national laboratories also include the nation's largest network of user facilities, open to all researchers on a peer-review basis, including five Nanoscale Science Research Centers.

Using nanocatalysts to make chemicals

Another way in which nanotechnology has an opportunity to reduce energy consumption is in the production of chemicals. Catalysts have been traditionally used to reduce the amount of energy required during chemical reactions. Using nanotechnology, we can create even more efficient catalysts and save even more energy.

Conclusion and Perspectives

Organic-inorganic hybrids are a technologically key class of advanced multifunctional materials that fulfil the challenging strict requirements of the beginning of this century higher levels of sophistication and miniaturization, recyclability, reliability, low energy consumption and environmental friendliness. The potential of these tailor-made materials with unparalleled performances, that are already entering niche markets, is basically due to the synergistic combination of organic, inorganic, and even biological components in a single system at the nanosize level.

Magnetoelectronic components particularly MRAM

Promising applications of magnetoelectronics in space are for example non volatile magnetic memories (MRAM) or magnetoresistive sensors as positioning-, acceleration- and rotation sensors instead of conventional semiconducting magnetic field sensors (Hall sensors). MRAM possess a high economic potential in the terrestrial market as replacement for DRAM memories and will presumably attain market readiness in 2004. Because of the special characteristics of MRAM such as non volatileness of the data (data remain preserved also in case of a power failure), a low energy consumption and an inherent radiation hardness, substantial system advantages for numerous applications in space are expected. Since however space represents only a niche market for the chip manufacturers, measures for the space specification and qualification has to be done by the space sector. In Germany there are several research activities in the range of magnetoelectronics in particular in the frame of the funding...

Scope of investigation and accessibility of data

Between these intermediate products and the product styrene are two more stages the ethylbenzene process and the styrene process, with the consequence that no clear differentiation is possible by means of this database. There are further life cycle assessment data available in the Gabi materials database (Gabi 4 Datenbank 1999b) likewise for the overall styrene production process, but also for the ethylbenzene process (from a production plant in the Netherlands, Gabi 4 Datenbank 1999a). Unfortunately, comparison of all available data sets did not reveal sufficient congruence for the emission data specific to the styrene process. This may be due to differences in calculation procedures or different data sources. Therefore only a differentiated evaluation of the energy consumption in styrene production was possible, as well as specific estimates of individual material flows (heavy metals). No quantified process data is available for the alternative styrene process based on a...

Applications in Catalysis

The catalytic production of styrene by dehydrogenation of ethylbenzene constitutes an example of carbon onions being applied in the process of industrial relevance (Figure 4.43) . Styrene is a basic chemical that is prepared on a scale of millions of tons. Normally, it is generated by thermal dehydrogenation, which, for being endothermic, requires supply with large amounts of energy. Furthermore, the catalyst (hematite with added potassium) is quickly deactivated, so altogether the process efficiency is limited. Hence, it is worthwhile searching for alternative procedures and catalysts. The oxidative dehydrogenation to styrene, for example, is exothermic and consequently far less demanding with regard to its energy consumption. A series of catalyst materials such as alumina, various phosphates, or metal oxides was found indeed. It turned out, however, that the actual catalytically active substance was a film of carbon that formed on the surface of the respective support. Therefore, it...

Nanofiltration Basics

In nanofiltration processes, a selective separation takes place across a semipermeable separation layer, which is formed over the top of a porous support. The driving force of the separation process is the pressure difference between the feed (retentate) and the filtrate (permeate) side of the separation layer of the membrane. The size of NF membrane pores in combination with the surface electrical properties allows divalent ions and uncharged solutes larger than a few thousand daltons to be highly retained, while monovalent ions and low-molecular weight organics are reasonably well transmitted. The nominal molecular weight cutoff for many commercially available nano-filtration membranes ranges from a few hundred to a few thousand daltons. 3 These characteristics make NF membranes extremely useful in the fractionation and selective removal of many dissolved solutes from complex process streams. Other advantages include high flux and low energy consumption (because of low operating...

Membranes made from nanomaterials

Application of a metal-oxane-based approach to creating ceramic membranes reduces the use of toxic solvents and energy consumption. By-products formed from the combustion of plasticizers and binders are minimized, and the use of strong acids eliminated. Moreover, the use of tailored nanoparticles and their deposition on a suitable substrate presents an extremely high degree of control over the nanostructure of the resulting sintered film. The versatility of the process can be used to tightly control pore-size distributions. The MWCO of the first generation of alumoxane-derived membranes is approximately 40,000 daltons 22 , which is in the ultrafiltration range. Table 9.4 shows a comparison of the ceramic and sol-gel methods with that of the carboxylate alumoxanes for the synthesis of alumina and ternary aluminum oxides. The ease of modification of the alumoxanes suggests that a single basic coating system can be modified and optimized for use with a range of substrates.

Heat Dissipation and the RSFQ Technology

The problem, for the RSFQ technology, is that refrigeration is needed to maintain RSFQ devices at the temperature of liquid helium. Liquid helium is a coolant widely used in Magnetic Resonance Imaging (MRI) medical installations. In addition to saving energy, the RSFQ technology allows extremely fast clock speeds, as seen in Figure 7.4. The energy consumption and the cooling power (note that these quantities are additive, in terms of operating costs) needed for a large computer in this technology are less, by large factors, than for an equivalent silicon (CMOS) machine. The savings in power and floor-space are significant. It can be argued that the size of the overall machine would be much smaller because the design would not have to have the fins, open channels, fans, and air conditioners that are normal in large silicon computer server-farm installations, simply to keep the devices from dangerously overheating, and to carry away the heat.

New Kind of Reverse Osmosis

The carbon nanotubes used by the researchers are sheets of carbon atoms rolled so tightly that only seven water molecules can fit across their diameter. Their small size makes them a good source for separating molecules. The nanopores also reduce the amount of pressure needed to force water through the membrane As a result, there are savings in energy costs when compared to reverse osmosis using conventional membranes.

Applications to computation

Concern might be raised about the cost of such intricately patterned matter, either because of labor or energy requirements. It seems clear, however, that molecular-scale production systems can be completely automated (what use is there for hands ). Thus, labor costs of production (including production of additional production equipment) can approach zero. The energy needed to produce molecularly engineered material will generally be greater than the energy needed to produce ordinary materials of similar bulk composition, but analogy suggests that the energy cost need not be vastly greater than for the production of biological materials. In many cases (e.g., advanced computers or any of a number of applications not discussed here), the unique value of the products would make such energy costs unimportant, even if energy costs remained high.

Conclusions and Discussion

For nano systems the main reasons to apply optimization methods is to obtain, either, all the needed local and global low energy conformations of a single molecule or the low energy configurations of an assembly of molecules like a cluster of molecules in an open space or a fluid encapsulated in a nanoscale closed system.

Polycrystalline Si For MEMS Applications

Characterization of these types of materials are complicated by the small size of the devices which in many cases may have features that do not exceed 1 lm. EBSD is ideal for determining the grain structure and texture of the multiple layers of polysilicon used to produce these devices. Preparation of samples is best performed with the FIB. In the case of silicon and the results shown here, subsequent low energy ion milling is required to produce EBSD patterns of sufficient quality for automated mapping. Figure 15 shows a FIB prepared cross section through an unreleased (the oxide spacers have not been removed) multilayer MEMS device. The sample was micromachined using the FIB in a manner similar to that used to make TEM samples 23 . The cross section was attached to a support grid by depositing Pt at the sample grid junction, due to the need for subsequent low energy ion milling to allow EBSD patterns to be acquired. This arrangement is robust and allows the sample to be handled with...

Generation Lithographic Technologies

With the term next generation lithography we mean nowadays mostly technologies competing to succeed optical lithography (including 157 nm) in production of integrated circuits. In this group we include extreme UV lithography (13 nm), along with projection particle technologies including electron and ion beams, low energy e-beam lithography, and X-ray lithography. Currently EUV 245 is considered as the strongest candidate and it will be discussed first. Similar is the situation in the case of e-beam projection lithography, where very high sensitivity is an important demand. Sensitivity issues are also mostly considered in the case of ion beam lithography. In the case of low energy beam lithography, which mostly refers to energies lower than 2 keV, the small penetration depth of electrons inside the resist imposes an extra demand for addressing thin film resist issues. Scanning tunneling microscope based lithography could also be considered as an extreme case of low energy e-beam...

Capping Effect on QD Shape and Size

The QD shape change during the capping process has been reported in the Ge Si 184, 185 and Inx Ga1-xAs GaAs 186, 187 systems. Sutter and Lagally 188 investigated the morphology evolution process in a GeSi Si system using low-energy electron microscopy. They found that the GeSi islands expand and undergo a shape change to incorporate a (100)-top facet under a Si flux. They explained that Si deposition results in intermixing between Si and Ge and the intermixing destabilizes 501 facets and a (100)-top facet becomes the thermodynamically stable structure. Atoms from the island top migrate down the sides resulting in the elimination of the 501 facets at the top and outward expansion of the remaining 501 facets in the lower parts

Fieldemission Application Of Carbon Nanotubes And Flat Panel Display

An individual nanotube on a probe for a scanning tunnel microscope and an atomic force microscope is the typical application of a point electron source. Schmid and Fink 82 demonstrated that individual carbon nanotubes can behave as a coherent electron source. They mounted a single nano-tube onto the tungsten tip of a low-energy electron point source microscope, and recorded the in-line holograms for a 7 nm wide carbon fiber that was used as a scattering object. This single nanotube electron source operated at low voltage, and could show an interference pattern with the same order of fringes as those shown by a conventional tungsten atomic point source. In addition, carbon nanotubes are relatively-chemically inert and tolerant to ion sputtering. These properties associated with the high coherence of emitted electrons and the low operating voltage make individual carbon nanotubes a unique point electron source.

NASA Research into Shape Shifting Airplanes

''The fact that this actuator requires very low energy input compared to currently available state-of-the-art actuators and generates much larger strains than those of piezoelectric polymers poly(vinylidene fluoride) (PVDF) and its copolymers, and piezoceramic lead zirconate titanate (PZT) is very important for NASA's long-term space exploration missions such as a trip to Mars or lunar habitats,'' says Park.

EELS and Raman Spectroscopy

Amorphous carbon coatings contain (mainly) a mixture of sp2- and sp3-bonds, even though there is some evidence for the presence of sp-bonds as well 26.82 . The PECVD coatings and the H-series coatings in this study have nearly the same mass density, as seen in Table 26.4, to be presented later, but the former have a lower concentration of hydrogen (18.1 ) than the H-series (35-39 ), as seen in Table 26.3, to be presented later. The relatively low energy position of n peaks of PECVD coatings, compared to those of the H-series, indicates that the PECVD coatings contain a higher fraction of sp3-bonds than the sputtered hydrogenated carbon coatings (H-series).

Nanooptical Switching and Conversion Elements

The coupling of photons with single-electron tunneling is not only of interest in relation to the UV and the visible regions of the electromagnetic spectrum. Josephson devices use, for example, the connection between microwave frequencies and superconductivity for ultra-sensitive magnetic measurements or highly precise voltage definition in magnetic tunnel junctions (MTJ). Beside these effects of long-wavelength radiation on the transport of Cooper pairs of electrons through tunneling barriers, single-electron transport processes can also interfere with low-energy photons. So-called Kondo peaks have been observed in the case of SET transistors exposed to microwave radiation 147 .

Synthetic Organic Polymers

In electron beam lithography, the best lithographic resolution is achieved with PMMA or other such beam resists. Structure widths between 50 and 100 nm are standard, but dimensions below 10 nm are accessible. Scanning probe techniques can also be applied for the nanofabrication of organic polymers. Thus low-energy electrons applied by a scanning tip resulted in line structures of 20 nm width in a urethane diacetylene polymer4).

Phonon populations and electrical power dissipation in carbon nanotube transistors

Carbon nanotubes and graphene are candidate materials for nanoscale electronic devices1,2. Both materials show weak acoustic phonon scattering and long mean free paths for low-energy charge carriers. However, high-energy carriers couple strongly to optical phonons1,3, which leads to current saturation4-6 and the generation of hot phonons7. A non-equilibrium phonon distribution has been invoked to explain the negative differential conductance observed in suspended metallic nano-tubes8, while Raman studies have shown the electrical generation of hot G-phonons in metallic nanotubes9,10. Here, we present a complete picture of the phonon distribution in a functioning nanotube transistor including the G and the radial breathing modes, the Raman-inactive zone boundary K mode and the intermediate-frequency mode populated by anharmo-nic decay. The effective temperatures of the high- and intermediate-frequency phonons are considerably higher than those of acoustic phonons, indicating a...

Raouf O Loutfy and Eugene M Wexler

When the reaction between alkali metals and fullerenes occurs, the former donate their electrons resulting in formation of 'fulleride' anions. Because of the low energy and triply degenerate nature of their lowest unoccupied molecular orbitals (LUMO) 4 , fullerenes can be reduced up to hexa-anion

Ionbeam Induced Nanostructures

Mayer et al. 103 characterized the development of nanometer scale topography on SiO surfaces as a result of low energy, off-normal ion bombardment, using in-situ energy dispersive X-ray reflectivity and AFM. Surfaces roughen during sputtering by heavy ions, with roughness increasing approximately linearly with ion fluence up to 1017 cm-2. A highly coherent ripple structure with wavelength of 30 nm and oriented with the wave vector parallel to the direction of incidence is observed after Xe sputtering at 1 keV. A linear model is presented to account for the experimental observations that include roughening both by random stochastic processes and by development of a periodic surface instability due to sputter yield variations with surface curvature that leads to ripple development. Chason et al. 108 investigated the temperature-dependent roughening kinetics of Ge surfaces during low energy ion sputtering by using energy dispersive X-ray reflectivity. At 150 C and below, the surface is...

Electronic Properties of Multiwall Carbon Nanotubes

The electronic and electrical properties of low-dimensional conductors are an exciting area of research. Very rich phase diagrams have been predicted. Since a small set of 1-D modes is sufficient to describe the low-energy electronic properties of carbon nanotubes, they are considered prototype 1-D molecular conductors. This is particularly true for Single-Wall NanoTubes (SWNTs). Many interactions are especially strong in 1-D. The Coulomb interaction, for example, cannot efficiently be screened, leading to a strongly correlated electron gas, called a Luttinger liquid, whose low-energy excitations are long-range density waves. In Luttinger liquids a pseudo-gap develops for the conventional quasi-particles. Because MWNTs consist of several coax-ially arranged SWNTs, one may expect that MWNTs do not qualify as 1-D conductors. However, there is now convincing evidence that Luttinger-liquid-like features are present in MWNTs too 44 . Moreover, the electric current introduced into a MWNT...

Heavy Ion Irradiation

For low-energy ions, elastic collisions dominate, resulting in displacement of atoms from crystal lattice and pointlike defects. For high-energy ions, inelastic collisions dominate. Experiment shows that the inelastic collisions with high-energy ions can result in amorphous columnar tracks in HTSs 67 . The diameter of the tracks is about 10 nm and the length is tens of m. An important parameter defining the formation of the columnar defects is the electronic energy loss, also called electronic stopping power, Se. It is defined as the energy transfer into the electronic excitations of the target atoms per unit length along the ion path through the target crystal Se -dEe dx. The value of Se depends on the type of the target crystal, type, and energy of the ion and direction of the irradiation in regard to the crystal structure. It can be approximated as 68

Consecutive Chemical Reactions

If a freshly produced gold film is treated with 10-4 M MBT solution, an S2p spectrum is recorded, as shown in Figure 32a. Two clearly separated components are found, representing the two differently bound sulphur atoms of the MBT molecule (Fig. 32a). The adsorption of MBT leads to deprotonation of most molecules, confirmed by the main component in the N1s spectrum with the binding energy of 399.0 eV, in comparison to the component of the not deprotonated molecules at 400.6 eV (Fig. 33a). Therefore, the low-energy component in the S2p spectrum (162.3 eV) can be attributed to the exocyclic sulphur of deprotonated and chemisorbed MBT. The second doublet at 163.9 eV is caused by the endocyclic sulphur. A partial oxidation of MBT to products containing sulphur-sulphur bonds like 2,2'-dithiobis(benzothiazole) is responsible for the deviation of the expected intensity ratio of 1 1 31, 117, 118 . Both types of sulphur atoms in BBTD have nearly the same

Self Assembled Monolayers

Similar immobilisation systems have also been demonstrated by damaging partially removing a functionalised monolayer, rendering that area of the monolayer inert for further attachment (Harnett 2000, Maeng 2003). NH2 patterned monolayers (80 nm) were used as templates for the site-selective immobilisation of palladium colloids, 20 nm aldehyde modified polystyrene spheres and 40 nm NeutrAvidin protein-coated polystyrene spheres onto the unirradiated areas of the monolayers (Harnett 2000). As discussed above, biomolecules and polymerisation of aziridine can be selectively immobilised on templates of reactive amino sites generated by e-beam irradiation on nitro-terminated monolayers (Jung 2003). Although demonstrated with micro scale resolution, a reverse system for immobilisation of these nanocomponents was shown to be more efficient. This system consisted of transforming an internal imine group of a benzaldimine monolayer into a nonhydrolyzable secondary amine group by low energy...

DNA Nanoarchitectures

The general principle of molecular construction is not limited to nucleic acids. However, these molecules show several properties that make them particularly suitable for the construction of complex molecular architectures. A modular construction principle has already been realized at the lowest level due to only four basic units (four nucleotides with the bases adenine, thymine, cytosine and guanine) connected in a linear manner by identical complementary bonds (sugar-phosphate bonds). The primary modular arrangement leads to a linear and thereby sequential structure, with properties determined by the sequence of the bases in the molecular chain. As a result of the base arrangement, an antiparallel association of two molecules can occur based on attractive interactions oftwo (thymine adenine) or three (guanine cytosine) hydrogen bonds for each base pairing. Because hydrogen bonds are (in contrast to electrostatic interactions) highly oriented, the individual bonds are only formed in...

Living Water and Hydrophobic Interactions

Dipole-dipole attractions occur among molecules with permanent dipole moments. Only specific orientations are favored alignments in which attractive, low energy arrangements occur as opposed to repulsive, high energy orientations. A net attraction between two polar molecules can result if their dipoles are properly configured. The induction effect occurs when a permanent dipole in one molecule can polarize electrons in a nearby molecule. The second molecule's electrons are distorted so that their interaction with the dipole of the first molecule is attractive. The magnitude of the induced dipole attraction force was shown by Debye in 1920 to depend on the molecules' dipole moments and their polarizability. Defined as the dipole moment induced by a standard field, polarizability also depends on the molecules' orientation relative to that field. Subunits of protein assemblies like the tobacco mosaic virus have been shown to have high degrees of polarizability. London dispersion forces...

Raouf O Loutfya JC Withers3 M Abdelkader3 and M Sennettb

Dispersion of nanotubes was carried out in dichloromethane using a 100-W FS30 (low energy) Fisher Scientific sonicator, and at a 475-W (high energy) Heat SystemsUltrasonics, Inc. Samples for compressive testing were prepared by melt processing in a mold between the two plates of a Carver Laboratory Press, equipped with a hydraulic system for pressure control and a thermocouple for temperature control. Composite's compressive tests were performed on cylindrical samples at room temperature using a universal mechanical tester by Applied Test System.

Energy Renewable and Clean

Nanotechnology innovations could impact each part of the value-added chain in the energy sector energy sources, energy conversion, energy distribution, energy storage, and energy usage. The possible applications range from high-duty nanocomposite materials for lighter and more rugged rotor blades for wind and tidal power plants, to efficient photovoltaic systems, fuel cells, and batteries, and energy savings through more efficient lighting sources, better insulation, or better lubricants. What follows are just a few examples that show nanotechnology's role in future energy systems.

Results of environmental assessments of selected nanotechnological application contexts

In the course of the above-mentioned research project, specific products and processes were analyzed to determine to what extent the application of nanotechnological contributions could contribute to environmental relief, and to what extent these possibilities can be realized. This emphasizes the dimension of opportunity offered by nanotechnology with a focus on contributions to resource efficiency and reductions in environmental pollution. It can be seen in the majority of the case studies that nanotechnology offers foreseeable eco-efficiency potentials. As an example, the chosen nanotechnological applications in the display field (OLED, CNT-FED) show higher energy efficiencies in the use phase (in some cases by a factor of two for reduced energy usage) as compared to previous solutions. Even greater potentials for efficiency increases by nanotechnological applications could be seen in selected cases in the area of industrial coatings and lacquers, as well as in catalytic...

Carbon Nanofibersnanotubes As Metal Supports

Bound to the surface, it can readily undergo reactions which take place only with difficulty in the gas or liquid phases. This may result from the close proximity of reactant molecules on the surface and or the changes in bonding consequent upon chemisorption both are essential features of the catalytic properties of the solid. The choice of a suitable catalyst for a particular reaction depends on the stability of the complexes formed between reactant and catalyst and or product and catalyst. These must be stable enough to form and provide an alternative pathway to the unca-talyzed reaction, but they must not be too stable as this would lead to an increase in the associated activation with a consequent lowering of reaction rate. The unique electronic, adsorption, and thermal mechanical properties associated with carbon nanofibers and nanotubes can all play interrelated roles in the design of catalytically efficient supported metal systems. The ability of a substrate to induce...

Subject of the investigation

The case study looked at the use of light sources for illumination. For this purpose, three different types were compared The two traditional light sources, the incandescent lamp and the energy-saving lamp, and the white LED based on nanoscale layers. When the current passes through the bulb, the filament is rapidly heated up to a temperature of about 2,600 C. This causes bright light to be radiated. The electrical energy is converted into light very inefficiently - 9095 of the energy is converted into undesired heat. The incandescent lamp has a very poor energy efficiency. Only a small percentage of the energy is converted into visible light. The energy efficiency can be enhanced by increasing the filament temperature this requires filling the glass bulb with a halogen mixture to maintain the service life of the lamp. This further development is called the tungsten-halogen lamp. In halogen-filled lamps, the tungsten wire may achieve a temperature of roughly 3,000 C. Variant 2 the...

Alternatives for CMOS electronics

Tunneling components (e.g. resonant tunneling diodes, RTD) harness the extraordinarily fast quantum-mechanical tunneling effect. This promises a clear speed increase in comparison to conventional elements. RTD from III V semiconductors are already used as high frequency oscillators in the THz range, optoelectronic switches, photodetectors etc. Application potentials in space exist in particular as ultra fast, energy saving

Molecular Building Blocks

The applications of molecular building blocks (MBBs) would enable the practitioner of nanotechnology to design and build systems on a nanometer scale. The controlled synthesis of MBBs and their subsequent assembly (self-assembly, self-replication or positional-assembly) into nanostructures is one fundamental theme of nanotechnology. These promising nanotechnology concepts with far reaching implications (from mechanical to chemical processes, from electronic components to ultrasensitive sensors from medical applications to energy systems, and from pharmaceutical to agricultural and food chain) will impact every aspect of our future.

Granular Giant Magnetoresistance

Such granular systems can be prepared by a number of other nonequilibrium techniques. Methods that have been demonstrated to effectively produce granular GMR materials include mechanical milling 11-13 , melt spinning 14-17 , spinodal decomposition 18, 19 , electrodeposition 20 , Joule heating 21-23 , pulsed laser deposition 24 , low-energy cluster beam deposition 25 , ion beam co-sputtering 26 , gas flow condensation 27 , and ion implantation 28 .

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