孔结构特征对硅基介孔材料调湿性能的影响

Effect of Pore Structure Characteristics on Hygroscopic Properties for Silicon-Based Mesoporous Materials

摘要:

以聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物（P123）、正硅酸乙酯（TEOS）及1,3,5-三甲苯（TMB）为主要原料，采用水热模板法，通过控制水热反应温度和时间，制备了具有介孔（2—50 nm）结构的无机硅基微球材料。根据介孔材料孔结构参数与吸、放湿特性关系，探讨了孔结构特征对无机硅基材料调湿性能的调湿机理。结果表明：介孔微球的孔径分布窄，平均孔径为0.7—16.1 nm、孔容为0.19—0.54 cm³?g^-1；研究同时还发现，无机硅基介孔材料在特定湿度区间的吸、放湿率，与对应湿度区间内发生毛细凝聚现象孔道的孔容大小密切相关。

Abstract:

A spherical silica-based mesoporous material was prepared using a hydrothermal template approach with the P123， TEOS and TMB as the main raw materials， by controlling the hydrothermal reaction temperature and time. The results reveal that the obtained particles have a narrow pore size distribution. The average pore size and a pore volume of the spherical silica mesoporous material can be controlled in the ranges of 0.7—19.1 nm and 0.19—0.54 cm³?g^-1， respectively. The moisture absorption and dehumidification rates of the silica-based mesoporous materials in the specified humidity range are closely related to the pore volume size during capillary condensation. The effect of pore structure characteristics on the humidity control performance of inorganic silicon-based materials was discussed， according to the relationship between pore structure parameters and moisture absorption and desorption characteristics of mesoporous materials.