For Novel Photonic and Electronic Functions Materials

Materials and Structures Laboratory, Tokyo Institute ofTechnology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan We review distinct photonic electronic properties originating from built-in nanostructures in transparent oxide-based materials, emphasizing potential of nanostructures hidden in crystal structure. Materials focused on are oxychalcogenides LaCuOCh (Ch chalcogen ion) and homologous oxides InGa03(Zn0)m (m integer) having naturally formed multi-quantum well structures and...

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Arrhenius plots for ionic conductivity of samaria-doped ceria ceramics. O.Otl 0.05 3 10 0 IS 0.20 0.25 x in Cst lSm,02.s Fig. 5. Variation of activation energy. a and pre-exponential factor, ct0 as function of Sm doping concentration in samaria-doped ceria ceramics in temperature range of 500-850rC. and then defect clusters. In addition, some microdomains of some possible ordered intermediate phase could also form. These different defect structures will affect the defect energetics and...

O

Schematic crystal and electronic structures of layered oxychalcogenides LaCuOCh (Ch chalcogen). V.B. and C.B. denote valence and conduction bands, respectively. Note that the band gap is primarily determined by CuCh layer. CuCh stacked along the c-axis as shown in Fig. I.8,9 Each layer constitutes edge-shared La40 and CuCh4 tetrahedra. Both S and Se can occupy the chalcogen site. Thus, there is a complete solid solution of LaCuOS-LaCuOSe system, i.e., LaCuOS, Se (x 0-1).4 The La O and...

Co

0 200 400 600 800 1000 1200 Gas concentration (ppm) Fig. 10. Calibration curve for the sensor fired at 750 C. Nano-Sn02-based TFRs were fabricated using screen printing technology with optimized 15wt of glass as a permanent binder. The sheet resistivity and TCR values obtained by TFR fired at 750 C were lesser by one to two orders of magnitude than the earlier reported values. Thick-film sensors fired at 750 C exhibit the highest sensitivity and selectivity to H2, CO, and LPG at optimal...

PbZro4Tio6O3Based Reflectors with Tunable Peak Wavelengths

Chen, J. H. Chu, and N. Daif National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Based on the phase separation, a series of quasiperiodic PbZro.4Tio.6O3 PZT multilayers consisting of the ordered alignment of the dense PZT and porous PZT layers have been grown using one single precursor. The multilayers exhibit good performance as a dielectric mirror, and the position of the reflection maximum can be...

Hydroxyapatite Carbon Nanotube Composites for Biomedical Applications A Review

Collagen Composite

Best Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, U.K. Ian A. Kinloch School of Materials, University of Manchester, Manchester Ml 7HS, U.K. Hydroxyapatite HA has been used in clinical bone graft procedures for more than 25 years. However, its poor tensile strength and fracture toughness compared with bone make it unsuitable for major load-bearing devices. Carbon nanotubes CNTs , with their high aspect ratio and...

How Nanotechnology Can Change Construction Materials

The majority of recent nanotechnology research in construction has focused on the structure of cement-based materials and their fracture mechanisms.4'24'25,32 New advanced equipment makes it possible to observe a structure at its atomic level. Moreover, the strength, hardness and other basic properties of microscopic and nanoscopic phases of materials can be measured.24 Atomic force microscopy AFM has been applied to the investigation of the amorphous C-S-H gel structure.This has led to the...

Morphologies Controlled Synthesis and Optical Properties of Bismuth Tungstate Nanocrystals by a Low Temperature Molten

Lijin Xie, Junfeng Ma,1' Jun Zhou, and Zhongqiang Zhao College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003, China Hua Tian, Yonggang Wang, Jiantao Tao, and Xiaoyi Zhu Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266003, China Well-crystallized bismuth tungstate Bi2W06 powders with different morphologies were successfully synthesized via a low-temperature molten salt method. The powders were characterized by X-ray...

Sintering Nanocrystal Ostwald

Sample of wormhole-like tungsten oxide exhibited an Hl-type isotherm,19 which is a kind of type IV and presents a mesoporous wormhole-like structure. The hysteresis loop of the isotherm was an H2 type of type IV curve when the tungsten oxide was calcined at 250 C. The mesopore collapsed and exhibited H3-type isotherms with slit-shaped pores during the calcination process at 500 C, and even yielded little hysteresis loop of the isotherm when the sample was calcined at 750 C. The detailed...

Synthesis of Nanophased Metal Oxides in Supercritical Water Catalysts for Biomass Conversion

Caroline Levy, Masaru Watanabe, Yuichi Aizawa, and Hiroshi Inomata Research Center of Supercritical Fluid Technology, Tohoku University, Sendai 980-8579, fapan Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, Chiba 275-8575, fapan Nanoparticles of zinc oxide-based materials ZnO, Z11AI2O4 with various morphologies were synthesized in supercritical water SCW with a flow-type apparatus and in sub- and supercritical water with a batch reactor. In the...

S1

He, T. Butler, and F. Castro, Sinter-HIP of Alpha-Alumina Powders with Sub-Micron Grain Sizes,11 Eur. Ceram. Soc., 22, 1801-9 2002 . 5N. Saito, S. Matsuda, and T. Ikegami, Fabrication of Transparent Yttria Ceramics at Low Temperature Using Carbonate-Derived Powder, J. Am. Ceram. Soc., 81, 2023-8 1998 . 6T. Shiono, R. Sato, H. Shiomi, T. Minagi, and T. Nishida, Synthesis and Characterization of Forsterite Precursor Effects of Milling Precursors on Its...

Synthesis of High Density and Transparent Forsterite Ceramics Using Nano Sized Precursors and Their Dielectric

Satoru Sano, Noriko Saito, Shin-ichi Matsuda, Naoki Ohashi, and Hajime Haneda National Institute for Materials Science, Ibaraki 305-0044, Japan Ube Material Industries Ltd., Yamaguchi 755-8510, Japan Department of Applied Chemistry, Kanagawa Institute of Technology, Kanawaga 243-0292, Japan Forsterite Mg2Si04 ceramics were prepared using Mg OH 2 and Si02 as precursors, and the effect of powder characteristics of Mg OH 2 on calcination and sintering was investigated. The use of highly dispersed...

MMVF10 Fibers

Histopathologicai pictures that show induction of an immune response in the form of granuloma against foreign fibers. Fibers are engulfed by phagocytic cells, such as macrophages and neutrophils, as an attempt to clear the irritant. HT fibers after a 2, b 7 c 30 and d 90 d and MMVF10 fibers after e 2, f 7, g 30 and h 90 d. fiber counts and histopathological gradation of the tissue response and correlate it with in-vitro dissolution rates. Before beginning the histopathological studies, fibers...

Future Developments

Much progress in concrete science is to be expected in conning years by the adaptation of new knowledge generated by a quickly growing field of nanotechnology.The development of the following concrete-related nanoproducts can be anticipated Catalysts for the low-temperature synthesis of clinker and accelerated hydration of conventional cements Grinding aids for superfine grinding and mechanochemical activation of cements Binders reinforced with nanoparti-cles, nanorods, nanotubes including...

Introduction

Hydroxyapatite HAp is a mineral and the major inorganic component of human bone and tooth. Solid or porous HAp ceramics have been used as hard tissue repairing materials in clinic. Zittle et al. reported protein adsorption onto calcium phosphates in 1951Since then, hydroxyapatite has also been used as a column packing material for chromatography to separate proteins or enzymes2'3'4. Recently, much attention has been focused on it as an adsorbent for removing pathogenic proteins from blood in...

Concrete with Nanoparticles

Mechanical properties of cement mortars with nano-iron-oxide and nanosilica were studied by Li et al.38 Experimental results demonstrated an increase in compressive and flex-ural strengths of mortars that contained nanoparticles. It was found that increased nanosilica content improved the strength of the mortars. Ultrafine fumed silica particles observed using JEM.37 Courtesy Andri Vital, EMPA Mat'ls Testing amp Research, laboratory for High-Performance Ceramics, Duebendorf, Switzerland....

Energy And The Environment

Preparation and Characterization of Samaria-Doped Ceria Electrolyte Materials for Solid Oxide Fuel Cells 199 J. Am. Ceram. Soc., Vol. 91, No. 1, p. 127-131, 2008 Design of High-Quality Pt-Ce02 Composite Anodes Supported by Carbon Black for Direct Methanol 205 M. Takahashi, T. Mori, F. Ye, A. Vinu, H. Kobayashi, and J. Drennan J. Am. Ceram. Soc., Vol. 90, No. 4, p. 1291-1294, 2007 Rapid Formation of Active Mesoporous Ti02 Photocatalysts via Micelle in a Microwave Hydrothermal 209 H.-W. Wang,...

Sensors

Prussian Blue Nanoparticles Encapsulated Within Ormosil Film 277 CESP, Vol. 28, No. 8, p. 109-124, 2008 High-Yield Synthesis of Nanocrystalline Tin Dioxide by Thermal Decomposition for Use in Gas Sensors 293 Int. J. ofAppl. Ceram. Technol., Vol. 5, No. 2, p. 181-187, 2008 Effect of Firing Temperature on Electrical and Gas-Sensing Properties of Nano-Sn02-Based Thick-Film 301 Resistors Int. J. ofAppl. Ceram. Technol., Vol. 4, No. 5, p. 446-452, 2007 Preparation of Ru-C Nano-Composite Films and...