Nano Archive

Effect of acidity on the formation of silica–chitosan hybrid materials and thermal conductive property

Witoon, Thongthai and Chareonpanich, Metta and Limtrakul, Jumras (2009) Effect of acidity on the formation of silica–chitosan hybrid materials and thermal conductive property. Journal of Sol-Gel Science and Technology . pp. 1465-152. ISSN 0928-0707 (print) 1573-4846 (version)

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Official URL: http://springerlink.metapress.com/openurl.asp?genr...

Abstract

In this study, the formation of silica–chitosan hybrid materials via sol–gel process under pH values of 2–6 were investigated using N2 sorption analysis, scanning electron microscopy, transmission electron microscopy, thermal analysis and zeta potential analyzer. The hierarchical structure consisting of meso- and macropore was formed when pH value was higher than 2. Mesopores were formed as the interparticle channels of silica nanoparticles aggregates, whereas macropores were the void between the aggregates (clusters). The clusters size was decreased with increasing the pH value, resulting in the increase of the macroporosity. The thermal conductivity of the products was controlled in the range of 0.06 and 0.13 W m-1 K-1 by varying the product porosity between 88 and 69% (pH 6 and pH 2, respectively).

Item Type:Article
Uncontrolled Keywords:Hybrid materials • Sol–gel preparation •Chitosan • Rice husk • Thermal conductivity
Subjects:Technology > Nanotechnology and agricultural applications
ID Code:7204
Deposited By:CSMNT
Deposited On:30 Sep 2009 08:46
Last Modified:30 Sep 2009 08:46

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