Properties of Li Exchanged Tetrasilicic Fluoro Mica(Li-TSM)and Synthesis of Composites with Antimicrobial and Antifungal Agents

摘要

Synthetic mica has more high thermostability than natural mica and can be controlled expandability and cation-exchange-capacity(CEC)by changing magnitude of effective-layer-charge(ELC).In this study,we prepared lithium-type tetra silicic mica(Li-TSM)from Na-TSM by ion exchange method.This mica is one of the expansible synthetic fluoro mica but a few details had been attempted.The negative charge in silicate layer of Li-TSM can be controlled by adjusting the amount of Al~(3+)-fixation,and the CEC is controllable.When the CEC of Li-TSM had been controlled by partially fixation of Al~(3+)to Li-TSM((Al,Li)-HTSM),their swelling ability increased and their introducable capacity of organic compounds into interlayer also increased more than Na-TSM.Furthermore,the composites of(Al,Ag)-HTSM,which is Ag~+-exchanged complex from(Al,Li)-HTSM,and(Al,Ag)-HTSM-TBZ(thiazole)complex,which has antifungal activity,was synthesized.The rate of elution of Ag~+ from this TBZ composite was inhibited than(Al,Ag)-HTSM.We thought that this was caused by chela-tion of Ag~+ and TBZ in interlayer.These composites had an antimicrobial and antifungal activity and this activity was observed for samples heat-treated up to at 400deg C where TBZ in TSM interlayer decomposed completely.