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11 July 2001 Piezoelectric property of sol-gel-derived composite gels
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Low-density piezoelectric aluminosilicate ceramics were prepared by sol-gel technology. In order to reinforce the fragile aluminosilicate aerogels, the inorganic component was mixed with organic polymers (polyacrylic acid, polyvinyl acetate, polydimethylsiloxane) during the gelling process. The strength of the composite gels increases two- or threefold, the piezoelectricity of the composite gels changes variously depending on the organic polymers. The aerogel containing polyvinyl acetate shows negligible piezoelectricity. The use of polydimethylsiloxane decreases the piezoelectricity by 50%; polyacrylic acid increases it by 100%. The structure and the Al incorporation have strong effects on the piezoelectricity. The chemical structures of the composite gels were investigated by means of 27Al and 29Si MAS NMR. Except for the gel samples with PDMS, the porosity of hybrid gels diminishes.
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Katalin Sinko, Kornel Fel, Janos Rohonczy, and Nicola Huesing "Piezoelectric property of sol-gel-derived composite gels", Proc. SPIE 4333, Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics, (11 July 2001);

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