Microstructure and Properties of Aluminosilicate layer/Silica Hybrid Film

采用四乙氧基硅烷（TEOS）和蒙脱石粘土（SM）制备了高纵横比（1nmX50nm）的铝硅酸盐膜。在酸性催化剂条件下，SM的加入降低了溶液的粘度。TEOS-SM (0.5wt%)-H_2O的粘度不随时间变化。随着SM含量的增加，溶胶粒径从几nm （0wt%）增加到几十nm （0.5wt%）。SM (0-0.5wt%)/SiO_2膜的厚度由0.5μm增加到3μm。纯SiO_2膜中裂纹较多，但裂纹数量随SM含量的增加而减少。SM (0.5wt%)/SiO_2膜无裂纹。在碱性催化剂条件下，溶液中SM的加入对溶胶状态和膜的厚度没有影响。所有薄膜都存在一定的裂纹，加入SM可以减少裂纹的数量。所得膜在2Θ=20°附近出现宽峰。这表明所得的SiO_2是无定形的。

Silica films including aluminosilicate layers of high aspect ratio (1nmX50nm) were prepared using tetraethoxysilane (TEOS) and smectite clay (SM). Under the acidic catalyst condition, the addition of SM decreased the viscosity of the solution. The viscosity of TEOS-SM (0.5wt%)-H_2O did not change with time. The sol particle size increased with SM content from a few nm (0wt%) a few ten nm (0.5wt%). The thickness of the SM (0-0.5wt%)/SiO_2 film changed from 0.5μm to 3μm. The pure SiO_2 film had many cracks, but the number of the cracks decreased with SM content. The SM (0.5wt%)/SiO_2 film had no cracks in it. Under the basic catalyst condition, the addition of SM to the solution did not affect the sol state and the thickness of the resulting films. There were some cracks in all films and the number could be decreased by the addition of SM.The resulting film showed broad peak around at 2Θ=20°. This indicates that the resulting SiO_2 was amorphous.