氧化石墨烯/磷钼酸复合物的制备及其液晶性研究

Preparation and liquid crystalline properties of the grapene oxide/phosphomolybdic acid composites

由Hummer’s方法制备的氧化石墨烯负载磷钼酸,制备了氧化石墨烯/磷钼酸复合物,其水溶液展现出较好的溶致液晶性.透射电镜分析表明,纯氧化石墨烯呈现出透明的褶皱薄纱状形貌,氧化石墨烯/磷钼酸复合物中磷钼酸微粒均匀分布在氧化石墨烯片层中.红外光谱说明氧化石墨烯和磷钼酸之间存在较强的相互作用.所得氧化石墨烯/磷钼酸复合物在偏振光下具有明显的溶致液晶性.相比相同条件下的纯氧化石墨烯,磷钼酸的引入没有破坏氧化石墨液晶体系的介晶结构,复合物表现出更明显的明暗交织的液晶织构,旨在将多酸嵌入氧化石墨液晶体系中并为多酸和氧化石墨烯的应用开拓一个新思路.

Graphene oxide/phosphomolybdic acid composites were prepared by phosphomolybdic acid loaded on the graphene oxide which was prepared according to the modified Hummer＇s method. The analyses of XRD and TEM images showed that phosphomolybdic acid was successfully introduced and uniformly dispersed in the graphene oxide platelets. IR analysis indicated that the interaction exi- ted between graphene sheets and phosphomolybdic acid. The well-soluble grapene oxide/phosphomo- lybdic acid composites exhibited nematic liquid crystallinity in water, which was better than that of the graphene oxide. Our results provide the way to introduce polyoxometalates into the liquid crys- tallinity, which is expected to have a variety of applications for polyoxometalates and graphene ox- ide.