超临界流体
溶剂
超临界二氧化碳
化学工程
材料科学
气凝胶
超临界干燥
收缩率
多孔性
丙酮
超临界流体萃取
扩散
滴定法
工业与生产工程
色谱法
化学
有机化学
纳米技术
复合材料
热力学
物理
电气工程
工程类
作者
Marina Schwan,Sarah Nefzger,Behdad Zoghi,C. Oligschleger,Barbara Milow
标识
DOI:10.3389/fmats.2021.662487
摘要
The solvent exchange as one of the most important steps during the manufacturing process of organic aerogels was investigated. This step is crucial as a preparatory step for the supercritical drying, since the pore solvent must be soluble in supercritical carbon dioxide to enable solvent extraction. The development and subsequent optimization of a suitable system with a peristaltic pump for automatic solvent exchange proved to be a suitable approach. In addition, the influence of zeolites on the acceleration of the process was found to be beneficial. To investigate the process, the water content in acetone was determined at different times using Karl Fischer titration. The shrinkage, densities, as well as the surface areas of the aerogels were analyzed. Based on these, the influence of various process parameters on the final structure of the obtained aerogels was investigated and evaluated. Modeling on diffusion in porous materials completes this study.
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