二元脂肪酸/SiO_2复合材料的湿性能

Humidity Property of Binary Fatty Acid/SiO_2 Composite Materials

以二元脂肪酸为相变材料、SiO_2为载体材料,采用溶胶-凝胶法制备不同核-壳比的二元脂肪酸/SiO_2复合材料,分析了其湿性能及组成结构、微观形貌和粒度分布.结果表明,在表面张力和毛细管的作用下,二元脂肪酸包裹于SiO_2的网络空隙结构中,二元脂肪酸用量为0.06 mol时,复合材料的湿性能最佳,在相对湿度40%~60%的条件下平衡含湿量为0.1297~0.1775 g/g,平衡时间为31~46 min.SiO_2具有丰富的"笼"结构,不仅可包裹束缚二元脂肪酸,还能吸附环境中的水分子,复合材料的d_(10)=148.54nm,d_(50)=254.73 nm,d_(90)=452.73 nm.

With binary fatty acid as phase change material, SiO2 as carrier material, according to different core--shell ratio, made binary fatty acid/SiO2 composite materials by sol-gel method. Humidity performance of binary fatty acid/SiO2 composite materials were tested, composition structure, microstructure and particle size distribution were characterized. The results showed that under the action of surface tension and capillary, binary fatty acid wrapped in SiO2 network space structure. While binary fatty acid content was 0.06 mol, binary fatty acid/SiO2 composite materials had the best humidity performance, such as equilibrium moisture content was 0.1297-0.1775 g/g and equilibration time is 31-46 min in the relative humidity of 40%-60%. SiO2 has rich ＂cage＂ structure, not only package and bound binary fatty acids, but also adsorption in the environment of water molecules. Binary fatty acid/SiO2 composite materials d10 was 148.54 nm, d50 was 254.73 nm and d90 was 452.73 nm.