桥联聚倍半硅氧烷纳米带的制备

Preparation of Bridged Polysilsesquioxane Nanobelts

依照文献以L-丙氨酸为手性源合成了一阴离子型两亲小分子化合物,利用圆二色谱研究了该化合物在水中的自组装行为,同时通过溶胶-凝胶复制法,以该手性阴离子型两亲小分子化合物的自组装体作为模板,以(3-胺丙基)三甲氧基硅为结构助剂,以倍半硅氧烷为硅源制备了桥联聚倍半硅氧烷纳米带,并利用扫描电镜、透射电镜和圆二色谱方法研究了该纳米带结构。透射电镜和圆二色谱表征结果表明,1,4-亚苯基桥联聚倍半硅氧烷和4,4′-亚联苯基桥联聚倍半硅氧烷的结构为中间有间隙的双层纳米带,且在纳米和埃的尺度下具有手性。

An anionic low-molecular-weight amphiphilic compound derived from L-alanine was synthesized according to the literature. Its self-assembly behavior in deionized water was studied using circular dichroism （CD）. A series of bridged polysilsesquioxane nanobelts were prepared using the self-assemblies of this compound as templates and 3-aminopropyltriethoxysilane as a co-structure-directing agent through a sol-gel transcription method. The bridged polysilsesquioxane nanobelts have been investigated by scanning electron microscopy, transmission electron microscopy（TEM） and circular dichroism. The TEM images and CD spectra of the polysilsesquioxanes indicate that the obtained 1,4-phenylene-bridged polysilsesquioxane and 4,4＇-biphenylene-bridged polysilsesquioxane are nanobelts with double layers having a gap in the middle, and these nanobelts are the chiral at levels of nanometer and angstrom.