Microstructure and Properties of Aluminosilicate layer/Silica Hybrid Film

以正硅酸乙酯（TEOS）和蒙皂石粘土（SM）为原料，制备了高纵横比（1 nm × 50 nm）的硅铝酸盐薄膜。在酸性催化条件下，SM的加入降低了溶液的粘度。TEOS-SM（0.5wt%）-H_2O体系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薄膜的厚度从0.5μm变化到3μm。纯SiO_2薄膜中存在较多的裂纹，但随着SM含量的增加，裂纹的数量逐渐减少。SM（0.5wt%）/SiO_2薄膜无裂纹，在碱性催化条件下，SM的加入对溶胶状态和薄膜厚度没有影响。在所有的薄膜中都有一些裂纹，并且通过添加SM可以减少裂纹的数量。所得薄膜在2Θ=20°附近显示宽峰。这表明所得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.