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Post by aqt on Jan 26, 2010 11:44:08 GMT -5
tiny.cc/l5OMkAbstract The organic/inorganic nanocomposites polymer electrolytes were designed and synthesized. The organic/inorganic nanocomposites membrane materials and their lithium salt complexes have been found thermally stable below 200 °C. The conductivity of the organic/inorganic nanocomposites polymer electrolytes prepared at room temperature was at magnitude range of 10−6 S/cm.
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Post by aqt on Jan 26, 2010 11:46:15 GMT -5
www.nature.com/nature/journal/v394/n6690/abs/394256a0.htmlContinuous self-assembly of organic–inorganic nanocomposite coatings that mimic nacreAlan Sellinger1, Pilar M. Weiss1, Anh Nguyen1, Yunfeng Lu1, Roger A. Assink1, Weiliang Gong2 & C. Jeffrey Brinker1 Sandia National Laboratories and the University of New Mexico, NSF Center for Micro-Engineered Materials, The Advanced Materials Laboratory, 1001 University Blvd. SE, Albuquerque, New Mexico 87106, USA Department of Earth and Planetary Sciences, The University of New Mexico, Albuquerque, New Mexico 87106, USA Correspondence to: C. Jeffrey Brinker1 Correspondence and requests for materials should be addressed to C.J.B. (e-mail: Email: cjbrink@sandia.gov). Top of pageNanocomposite materials are widespread in biological systems. Perhaps the most studied is the nacre of abalone shell, an orientated coating composed of alternating layers of aragonite (CaCO3) and a biopolymer. Its laminated structure simultaneously provides strength, hardness and toughness: containing about 1 vol. % polymer, nacre is twice as hard and 1,000 times as tough as its constituent phases1. Such remarkable properties have inspired chemists and materials scientists to develop synthetic, 'biomimetic' nanocomposite assemblies2, 3, 4, 5. Nonetheless, the efficient processing of layered organic–inorganic composites remains an elusive goal. Here we report a rapid, efficient self-assembly process for preparing nanolaminated coatings that mimic the structure of nacre. Beginning with a solution of silica, surfactant and organic monomers, we rely on evaporation during dip-coating to induce the formation of micelles and partitioning of the organic constituents into the micellar interiors6. Subsequent self-assembly of the silica–surfactant–monomer micellar species into lyotropic mesophases7 simultaneously organizes the organic and inorganic precursors into the desired nanolaminated form. Polymerization fixes this structure, completing the nanocomposite assembly process. This approach may be generalized both to other composite architectures and to other materials combinations.
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Post by aqt on Jan 26, 2010 11:47:01 GMT -5
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