Preparation of hybrid aerogels for vacuum drying

Under the strong support of the Ministry of Science and Technology and the National Natural Science Foundation of China, scientists from the State Key Laboratory of Polymer Physics and Chemistry of the Institute of Chemistry, Chinese Academy of Sciences, for the first time prepared a flexible low density organic-inorganic hybrid gas by simple vacuum drying technology. gel. This aerogel material with simple preparation method, excellent performance and easy surface functionalization is of great significance for the practical application of aerogel.

Researchers first prepared a bridged silsesquioxane precursor containing thioether segments through molecular design and dried directly at room temperature to obtain aerogel, which greatly simplified the aerogel preparation process. The aerogel obtained by vacuum drying completely retains the initial size of the wet gel, not only has the excellent characteristics of the aerogel prepared by the traditional method, but also has good elasticity, and can be compressed repeatedly without generating for 30% deformation. Permanent deformation; Even after soaking in ethanol or aqueous solution, the structure remains unchanged after vacuum drying. This provides the possibility of functional modification of the aerogel skeleton surface by a simple wet chemical or physical dipping method.

Aerogels are one of the lowest density synthetic materials known to date, and have attracted wide attention due to their extremely low apparent density and thermal conductivity, high porosity and specific surface area. However, the aerogel's porous structure and extremely low density lead to its poor mechanical strength; in addition, the commonly used supercritical drying process has complicated procedures, long cycle, low yield, and high cost, which restricts the practical application of aerogels.

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