Icin Oyku, Semerci Tugce, Soraru Gian Domenico, Vakifahmetoglu Cekdar
Department of Materials Science and Engineering, İzmir Institute of Technology, 35430 İzmir, Turkey.
Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy.
ACS Omega. 2023 Aug 28;8(36):32955-32962. doi: 10.1021/acsomega.3c04607. eCollection 2023 Sep 12.
This work reports the synthesis and characterization of preceramic- and polymer-derived SiOC aerogels obtained from a commercial siloxane resin. The preceramic aerogels were obtained by ambient pressure drying (ambigels) and CO supercritical drying. Despite different drying processes, the final ceramic ambi/aerogels have very similar microstructural features in density, porosity, pore size, and specific surface area. Both materials have shown promising results for oil sorption and water cleaning. Supercritically dried-SiOC aerogel had low thermal conductivity with 0.046 W·m·K at RT and 0.073 W·m·K at 500 °C. These results suggest that substituting the rather complicated and expensive CO-SC drying with the more friendly and cheap ambient pressure drying can be done without having to accept significant microstructural/property degradation.
这项工作报道了由商用硅氧烷树脂制备的陶瓷前驱体和聚合物衍生的SiOC气凝胶的合成与表征。通过常压干燥（常压气凝胶）和CO超临界干燥获得了陶瓷前驱体气凝胶。尽管干燥过程不同，但最终的陶瓷常压气凝胶/气凝胶在密度、孔隙率、孔径和比表面积方面具有非常相似的微观结构特征。两种材料在吸油和水净化方面均显示出有前景的结果。超临界干燥的SiOC气凝胶具有低导热率，室温下为0.046W·m·K，500℃时为0.073W·m·K。这些结果表明，用更友好且便宜的常压干燥替代相当复杂且昂贵的CO超临界干燥，无需接受显著的微观结构/性能退化。
