多孔二氧化硅微球复合硅基气凝胶的制备及性能研究  

Preparation and Properties of Porous Silica Microspheres Composite Silica-based Aerogel

作　　者：唐杰[1] 秦陆洋 彭慧慧 匡亮 王丽丽[1] 聂朝胤[1] Tang Jie;Qin Luyang;Peng Huihui;Kuang Liang;Wang Lili;Nie Chaoyin(School of Materials and Energy,Southwest University,Chongqing,400715)

机构地区：[1]西南大学材料与能源学院,重庆400715

出　　处：《当代化工研究》2024年第13期61-63,共3页Modern Chemical Research

摘　　要：本文利用纳米多孔二氧化硅微球复合优化了有机硅源气凝胶的结构与性能,在一定程度上改善了有机硅气凝胶孔隙尺寸大,隔热性能较差的问题。实验结果表明:二氧化硅微球的引入,细化了气凝胶二次粒子的尺寸,气凝胶骨架由珍珠链状结构转变为紧密堆叠结构,骨架连接强度得到显著增强。得益于这种转变,复合气凝胶表现出优异的力学性能,当压缩应变为80%时,其应力从81.5 kPa增大到175.1 kPa。与此同时,复合气凝胶隔热性能也进一步提升,导热系数从0.0469 Wm^(-1)·K^(-1)下降到了0.0408 Wm^(-1)·K^(-1)。This article utilizes the composite of nanoporous silica microspheres to optimize the structure and properties of organic silicon source aerogel,partially resolving the problem of large pore size and poor thermal insulation performance in organic silicon aerogel.Experimen-tal results show that the introduction of silica microspheres refines the secondary particle size of aerogel,transforms the pearl chain structure of the aerogel skeleton into a closely packed structure,and significantly enhances the skeleton connection strength.Thanks to this transformation,the com-posite aerogel exhibits excellent mechanical properties,with its stress increasing from 81.5 kPa to 175.1 kPa when the compressive strain is 80%.At the same time,the thermal insulation performance of the composite aerogel is also further improved,with the thermal conductivity decreasing from 0.0469 Wm^(-1)·K^(-1) to 0.0408 Wm^(-1)·K^(-1).

关 键 词：硅基气凝胶 力学性能 隔热性能 多孔二氧化硅微球 

分 类 号：O648[理学—物理化学]