News Column

Reports on Alkenes from University of Western Ontario Provide New Insights

May 6, 2014



By a News Reporter-Staff News Editor at Physics Week -- Investigators publish new report on Alkenes. According to news originating from London, Canada, by VerticalNews correspondents, research stated, "Light-selective polymer films based on poly(ethylene-vinyl acetate) (PEVA) are of significant interest in emerging solar materials, including PV encapsulants and greenhouse plastic films. Quantum dots (QDs) have been shown to absorb UV light while transmitting light of higher wavelengths which potentially can be advantageous for enhancing PV efficiencies or in the case of greenhouse films, controlling plant growth."

Our news journalists obtained a quote from the research from the University of Western Ontario, "However, a simple procedure for integration of the QD nanocrystals into PEVA films with retention of the light selective properties has been elusive. In this work we report a simple procedure for loading QD nanocrystals into PEVA using a novel silane functionalized QD approach by simple melt-mixing in a twin-screw extruder. Both bare CdS and core-shell CdS-ZnS QDs were synthesized by colloidal chemistry using a facile single-molecular precursor method, and then functionalized with (3-mercaptopropyl)trimethoxysilane to improve their compatibility with PEVA. These nanocrystals were then melt-mixed into PEVA in a mini-compounder, with the resulting blends extruded and pressed into thin films using a Universal Film Maker and a Carver hydraulic press. Both experimental and commercial greenhouse films were analyzed by electron, confocal and atomic force microscopy, showing that the silane ligand enhanced dispersibility of QDs throughout the PEVA."

According to the news editors, the research concluded: "The bare and core-shell QDs were studied at various loading levels from 0.1% to 0.5%, showing high light transmissions (90%) and decreased UV transmission with increased QD loading."

For more information on this research see: Surface functionalized bare and core-shell quantum dots in poly (ethylene-co-vinyl acetate) for light selective nanocomposite films. Solar Energy Materials and Solar Cells, 2014;123():30-40. Solar Energy Materials and Solar Cells can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Solar Energy Materials and Solar Cells - www.elsevier.com/wps/product/cws_home/505675)

The news correspondents report that additional information may be obtained from J.M. Allan, University of Western Ontario, London, ON N6A 5B9, Canada. Additional authors for this research include M.A. Mumin, W.Z. Xu, Q. Al Sharari and P.A. Charpentier.

Keywords for this news article include: London, Canada, Ontario, Alkenes, Ethylenes, Nanocrystal, Quantum Dots, Nanotechnology, Quantum Physics, Emerging Technologies, North and Central America

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Physics Week


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