Development of light-transmitting heat-insulation materials using novel hybrid gels

在甲基倍半硅氧烷体系中，以表面活性剂和尿素为添加剂，采用一步合成法合成了有机-无机杂化固体材料，并对其进行了超临界或常压蒸发干燥。通过对凝胶组成和反应条件的调整，合成了具有多级大孔和中孔结构的凝胶。研究了气体压力与上述材料的热导率之间的关系及其与孔结构的关系。

Light-transmitting, low-density organic-inorganic hybrid solid materials suitable for heat-insulation were obtained in the methylsilsesquioxane system via one-step synthesis using surfactants and urea as additives followed by either super-critical or ambient evaporation drying of the solvent. Gels with hierarchiall macro-and mesopores have also been synthesized by careful tuning ofthe compositions and reaction conditions. The relation between gas pressure and thermal conductivity of the above materials have been investigated in relation to their pore structures.