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Fabrication of nanoporous silica aerogels with low density(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2010年04期
Page:
107-110
Research Field:
Publishing date:
2010-08-20

Info

Title:
Fabrication of nanoporous silica aerogels with low density
Author(s):
GENG Gang-qiang1;  WANG Shan-yue2;  BI Wei-tao1;  MA Rui-jie1;  BIAN Gong-xun1
1. School of Material Science and Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 2. Jiangsu Qiming Environment Protection and Energy Saving Technology Co Ltd, Suzhou 215004, Jiangsu, China
Keywords:
material engineering;  sodium silicate;  nanoporous;  aerogel;  silica;  ion exchange
PACS:
O648
DOI:
-
Abstract:
The SiO2 aerogels of low density was fabricated by ion exchange and sol-gel method on the basis of sodium silicate. The effect of pH value, annealed temperature and solvent exchange process on the gel time, aerogel density, porosity and the micro-structure was studied. The results show that when the pH value is 6, the gel system is annealed at 50 ℃ for 84 h, 60 ℃ for 72 h, and a mixed trimethyl chlorosilane, n-hexane and isopropyl alcohol solution is used for surface modification, the best quality of silica aerogels with low density(0.2 g/cm3), higher porosity(90.1%)and pore size of 20～40 nm can be obtained. 4 tabs, 5 figs, 8 refs.

References:

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Memo

Memo:
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Last Update: 2010-08-20