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Acoustic Properties of Organic/Inorganic Composite Aerogels

Published online by Cambridge University Press:  31 January 2011

Winny Dong ,
Tanya Faltens ,
Michael Pantell ,
Diana Simon ,
Travis Thompson  and
Wayland Dong
Winny Dong
Affiliation:
[email protected], California Polytechnic University, Chemical and Materials Engineering, Pomona, California, United States
Tanya Faltens
Affiliation:
[email protected], California Polytechnic University, Chemical and Materials Engineering, Pomona, California, United States
Michael Pantell
Affiliation:
[email protected], California Polytechnic University, Physics, Pomona, California, United States
Diana Simon
Affiliation:
[email protected], California Polytechnic University, Industrial Chemistry, Pomona, California, United States
Travis Thompson
Affiliation:
[email protected], California Polytechnic University, Mechanical Engineering, Pomona, California, United States
Wayland Dong
Affiliation:
[email protected], Veneklasen Associates, Santa Monica, California, United States
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Abstract

Composite aerogels (with varying concentrations of silica and poly-dimethylsiloxane) were developed and their acoustic absorption coefficient as a function of composition and average pores size have been measured. The polydimethylsiloxane modified the ceramic structure of the silica aerogels, decreasing the material’s rigidity while maintaining the high porosity of the aerogel structure. The composite aerogels were found to exhibit different modes of acoustic absorption than that of typical porous absorbers such as fiberglass. At some frequencies, the composite aerogels had 40% higher absorption than that of commercial fiberglass. Physical data show that these materials have a large surface area (> 400 m2/g) and varying pore sizes (d ˜ 5 - 20 nm).

Keywords

cellular (material form)cellular (material type)acoustic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1188: Symposium LL – Architectured Multifunctional Materials , 2009 , 1188-LL07-02
Copyright
Copyright © Materials Research Society 2009

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