以CTAB微乳为模板制备碳酸钙-环糊精复合材料

Preparation of calcium carbonate-cyclodextrin composite materials using CTAB microemulsion template

采用复分解反应法在阳离子表面活性剂十六烷基三甲基溴化铵微乳模板中合成了碳酸钙-环糊精纳米复合材料(无机相为以方解石为主的方解石、球霰石、文石混合晶型的碳酸钙,有机相为环糊精)。结果表明,生成球霰石、文石的最佳工艺条件为:反应温度80℃,反应时间12 h,氯化钙浓度3.50 g/dm,环糊精浓度0.135 g/dm。复合材料粒子形状为菱形片状,有些系统中可以观察到类似贝壳珍珠层的"砖-泥"式层状结构,这种结构是环糊精与方解石(110)晶面作用的结果。

Double decomposition method and hexadecyltrimethylammonium bromide( CTAB) microemulsion template are used to prepare calcium carbonate-cyclodextrin nano composite materials. The inorganic matter is mixture of calcite,vaterite and aragonite in which calcite is main crystal form; organic matter of composite materials is cyclodextrin. The results show that the optimum technological combination to vaterite and aragonite formation is: temperature 80 ℃,reaction time 12 h,concentration of reactants3. 50 g / dm and concentration of cyclodextrin 0. 135 g / dm. Particles of materials are rhombic and schistose. The formation of brick-and-mortar structure like nacre in some systems is attributed to interaction of cyclodextrin and calcite( 110) lattice plane.