Ceramic Nanofibers For Clean Energy Sources Excitonic Solar Cells

One of the major challenges that future generations will face is to find out solutions for the increasing energy needs. This challenge stems from the limitations in the stock of natural fossil fuels. Therefore, search for alternate energy source that are not only renewable but also clcan from environmental and other hazards has been initiated worldwide. Photovoltaics (PV) are a promising technology that directly takes advantage of our planet's ultimate source of power - the sun. When exposed to...

Materials And Methods

Commercial nanocrystalline transition alumina powders (NanoTek by Nanophase Technology. USA, 99.95 purity, average crystallite size of 47 nm34) and YCly6H20 (Aldrich, CAS. N 10025-94-2, 99.99 purity) were employed for the preparation of 95 vol. AI Oj- 5 vol. YAG (AY95) powders. Many aqueous NanoTek alumina slurries (solid content of 33 wt. ) were prepared and powder de-agglomeration was obtained under magnetic stirring tor several hours (up to 120 hrs) or by ball milling for 2.5 hrs by using...

Introduction

Most failures for mechanical components occur on surfaces such as wear, corrosion, fatigue fracture, fretting fatigue, etc. Therefore, optimization of the surface microstructure and chemistry is an effective approach to eliminate the failures of mechanical parts. One of the effective modifications of surface microstructure is surface nanocrystallization. Surface nanocrystallization increased surface hardness1, physical properties2, and wear and corrosion properties3'4. Surface chemistry...

Info

FTIR-ATR spectra of (a) as-coated, and pyrolyzed SiOC thin films at (b) 800-900 C, (c) 1000-1100 C, (d) 1200 C and (e) 1250 C. At 800-900 C the Si-H and Si-CH, related bands at 2200-2150 and 760 cm1 respectively are absent suggesting that the polymer-to-ceramic transformation is complete. At the same time a complex and broad absorption band is observed in the range 1300-900 cm with a local peak at 1000 cm' assigned to the vibration of Si-0 bonds. It is assumed that this broad band...

References

Harris, Carbon Nanotube Composites, Int. Mater. Rev., 49, 31 -43 (2004). 2M. F. Yu, O. Lourie, M. J. Dyer, K. Moloni, T. F. Kelly, and R. S. Ruoff, Strength and Breaking Mechanism of Multiwalled Carbon Nanotubes under Tensile Load, Science, 287, 637-40 (2000). 3H. J. Li, W. G. Lu, J. J. Li, X. D. Bai, and C. Z. Gu, Multichannel Ballistic Transport in Multiwall Carbon Nanotubes, Phys. Rev. Lett., 95, (2005). JP. Kim, L. Shi, A. Majumdar, and P. L. McEuen, Thermal Transport Measurements...

Results And Discussions

A previous study19 revealed that a better photocatalytic activity of Ti02 films is obtained if coating is deposited on a Si02 buffer layer and not directly on the glass substrate. Thus, the diffusion of sodium ions from substrate into the film, which could stimulate the transformation from anatase to rutile phase, is avoided. It is important not only to have a good photocatalytic activity but also to maintain it in time, thus means that the bacteria must have a good adherence on the substrate,...

Effect Of Carbon Nanotubes Addition On Matrix Microstructure And Thermal Conductivity Of Pitch Based Carbon Carbon

Lalit Mohan Manocha''4 , Rajesh Pande1, Harshad Patel', S. Manocha1, Ajit Roy2 and J. P. Singh'1 'Department of Materials Science, Sardar Patel University, Vallabh Vidyanagar 388 120, Gujarat, India 4 Sophisticated Instrumentation Centre for Advanced research and Testing. Vallabh Vidyanagar -388 120. Gujarat, India

Rv3

Variation of the AFM parameters with PEG content for a TiOi I Fe Another important parameter in the anatase phase stabilization is the porosity P of the films which was calculated from the refractive index n of the film from the formula21 P l- n2-l no2-l , where no is the refractive index of anatase. The refractive index was obtained from ellipsometric analysis. The computations were done by taken into account the EMA22 model with two layers on the substrate Ti02 Fe, PEG film first...