%0 Journal Article
%T Preparation and Investigation of Nanoporous Super Thermal Insulation: Silica Aerogels<br>纳米孔超级绝热材料气凝胶的制备与热学特性
%A SHEN Jun
%A ZHOU Bin
%A WU Guang-ming
%A DENG Zhong-sheng
%A NI Xing-yuan
%A WANG Jue
%A <br>沈军，周斌，吴广明，邓忠生，倪星元，王珏
%J 过程工程学报
%D 2002
%I 
%X Nano-porous SiO2 aerogel insulations were prepared via two methods: (1) Using tetraethoxysilane (TEOS) as the precursor and followed by ethanol supercritical drying; (2) Surface modification of alcogels prepared from polyethoxydisiloxanes (E40) and followed by drying at ambient pressure. TEM, SEM and pore size distribution techniques were used to characterize the morphology and pore structure of the silica aerogels. The thermal conductivity of the silica aerogels was determined using the transient hot-wire technique. The results show that the pore size distribution of silica aerogels is from several nanometer to dozens of nanometer, the size of the particles is 5~10 nm and the average pore size (BJH) is about 20 nm and 10 nm respectively for samples derived from the two different methods, while the thermal conductivity of the silica aerogels (100 kg/m3) are 0.0125 and 0.014 W/(m.K) respectively at room temperature and 1.01105 Pa.
%K SiO2 aerogel
%K nanoporous
%K solgel
%K thermal conductivity<br>SiO2气凝胶
%K 纳米孔
%K 溶胶－凝胶
%K 热导率
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=3FCF8B1A330466D5&jid=B9EE12934D19905403D996AE65CEEEED&aid=90FBFCC50781A96D&yid=C3ACC247184A22C1&vid=0B39A22176CE99FB&iid=E158A972A605785F&sid=4B168891B5E5FB30&eid=3622B70F9C54A9CC&journal_id=1009-606X&journal_name=过程工程学报&referenced_num=21&reference_num=8