常压干燥制备微米级厚度RF气凝胶薄膜

以间苯二酚(Resorcinol)和甲醛(Formaldehyde)为前驱体，溶胶-凝胶法为主要方法，采用旋转涂膜，通过控制溶液配比及环境条件，用常压干燥方式取代通常的超临界干燥，成功制备出厚度在微米级的有机气凝胶薄膜. SEM照片显示，该薄膜具有与块体气凝胶相似的网络结构. 分析了旋转涂膜和常温干燥过程对最终成膜的影响. 结果发现，增大凝胶孔隙结构和优化凝胶老化方式是实现常压干燥的关键因素.

Preparation of Micron-thick RF Aerogel Films under Conventional Drying

Organic aerogel films were prepared with resorcinol and formaldehyde (RF) by combining solgel and spin-coating methods. By controlling solution composition and surrounding conditions, the RF aerogel films with the thickness of micron-scale were successfully produced under conventional drying instead of supercritical drying. The SEM pictures show that the films have the similar network structure to the bulk products. The effects of spin-coating and conventional drying processes on the final films were analysed, the results indicate that enlargement of the pore size and opitimization of the aging method of the films are the most important measures to realize conventional drying.