SiO_2气凝胶力学性能的影响因素及改善方法  

The impact factors and improvement methods of the mechanical properties of the SiO_2 aerogels

作　　者：廖云丹[1] 吴会军[1,2] 丁云飞[1,2] 

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]广州大学广东省建筑节能及应用技术重点实验室,广东广州510006

出　　处：《功能材料》2010年第A02期201-203,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50906014);广州市高校科技计划资助项目(08C052)

摘　　要：SiO2气凝胶的纳米多孔网络结构使其在热学、声学、光学、电学等领域具有广阔的应用前景,但其强度低和韧性差限制了发展和应用。对SiO2气凝胶力学性能的表征方法进行了概述,综述了制备工艺参数(如溶液酸碱度、组分配比、反应温度及时间、后处理工艺、干燥工艺等)对SiO2气凝胶网络结构及力学性能影响的研究进展,并介绍了材料复合法用于改善SiO2气凝胶力学性能的研究进展。SiO2 aerogels have been well acknowledged as the attractive candidates in many applications for their unique thermal,acoustic,optical and electrical properties owing to the nano-porous network structures.However,the low strength and fragility of the SiO2 aerogels monoliths limited their development and applications.The characterizations of the mechanical properties of the SiO2 aerogels were summarized.The effects of fabrication conditions（viz.,the pH,the material ratio,the reaction temperature and time,the post-treatment techniques and the drying conditions）on the network structure and mechanical properties of the SiO2 aerogels were reviewed.The advance on the improvement of the mechanical properties of the SiO2 aerogels by using composite methods was also introduced.

关 键 词：SIO2气凝胶 力学性能 制备工艺 材料复合法 

分 类 号：TB332[一般工业技术—材料科学与工程] TU551.38[建筑科学—建筑技术科学]