New PDF release: Advanced Materials Source Book

By Jon Binner, Paul Hogg and John Murphy (Eds.)

ISBN-10: 1483135810

ISBN-13: 9781483135816

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The researchers say they made their materials by mixing pure silicon glass powders together and heating the mixture in ceramic crucibles at 1400°C. The clusters can be tuned to different wavelengths by adjusting the size of the silicon particles which are in turn controlled by the duration of the heating process. The phenomenon of light-emitting porous silicon was first reported as an effect possibly arising from silicon structures that had been etched down to a thin skeleton of quantum wires. However, at the time, it was not clear whether the luminescence came from a quantum confinement effect, in which the small size of ultra fine semiconductors causes them to lose their bulk properties, or whether it came from surface chemicals formed during the etching process.

5 Glass with microporosity A glass with uniformly distributed micropores measuring 10-200 nm has been developed by the Government Industrial Research Institute in Osaka, Japan, reports the Daily Industrial News. The principal application is said to be in high speed liquid chromatography, where the glass has 40 times the durability of silica gels. 6 Alkali-resistant porous glass A technology for mass producing porous glass with high resistance to alkalis has been developed by Central Glass Co Ltd of Tokyo, Japan.

The superconductor had a composition of YBa2Cu3Ü7 and a critical transition temperature (Tc) of 89 K, reports the Daily Industrial News. 5 Record critical current densities for high-Te superconductors Record critical current densities for polycrystalline high temperature superconducting thick films have been reported by researchers from General Electric Co (GEC), Schenectady, New York, USA. 2 μηι thick thallium-barium-calcium-copper oxide (TBCCO) film produced by GEC showed a substantial improvement over previous results.

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Advanced Materials Source Book by Jon Binner, Paul Hogg and John Murphy (Eds.)


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