摘要
以正硅酸甲酯为硅源,采用溶剂甲醇和N,N-二甲基甲酰胺,通过酸碱两步催化溶胶-凝胶法,结合CO2超临界干燥技术制备出高透光率SiO_2气凝胶。利用扫描电镜、比表面积和空隙分析仪、紫外-可见分光光度计对该气凝胶的结构和光学性能进行了研究。结果表明,用N,N-二甲基甲酰胺为溶剂获得的气凝胶具有好的三维纳米多孔结构,平均孔径15.16 nm,比表面积922.1 m2/g;0.4 cm厚的样品在波长800 nm处的透光率高达92.4%。由于该气凝胶具有较高的透过率,因此在太阳能集热器方面具有极高的应用价值。
The highly transparent silica aerogels were successfully prepared by sol-gel process and subsequently supercritical drying with carbon dioxide. Tetramethyl orthosilicate was used as Si source, methyl and N, N-Dimethylformamide was used as solvent. The structures and optical properties of the silica aerogel were characterized by SEM, BET and UV. The results indicated that the sample possessed three-dimensional nano porous structure, with average pore size of 15.16 nm and specific surface area of 922.1 m2/g. The transmittance of the sample which had a thickness of 0.4 cm was up to 92.4% at the wavelength of 800 nm. With its high transmittance, this kind of silica aerogels has a potential application in the field of solar collector.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2016年第2期550-554,共5页
Bulletin of the Chinese Ceramic Society
基金
中国工程物理研究院科学技术发展项目基金(2015B0302071)
中国工程物理研究院发展基金项目(2013A0302016)
西南科技大学重点科研平台专职科研创新团队建设基金项目(14tdjk04)
2013年四川省学术与技术带头人培养资金资助
