MORPHOLOGY CONTROL OF LIQUID CRYSTALLINE COMPOSITE GELS BASED ON MOLECULAR SELF-ASSEMBLING KINETICS
MORPHOLOGY CONTROL OF LIQUID CRYSTALLINE COMPOSITE GELS BASED ON MOLECULAR SELF-ASSEMBLING KINETICS
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DOI：
10.1080/15421400390223112
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发表时间：
2003-01
影响因子：
0.7
通讯作者：
H. Abe;H. Kikuchi;K. Hanabusa;Takashi Kato;T. Kajiyama
中科院分区：
文献类型：
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作者：
H. Abe;H. Kikuchi;K. Hanabusa;Takashi Kato;T. Kajiyama
采用两种凝胶化方法制备了由低分子量凝胶因子和低分子量液晶组成的液晶复合凝胶：（1）连续冷却法和（2）等温凝胶法，这两种方法提供了不同的低分子量凝胶因子在凝胶化过程中的分子自组装动力学。光学显微镜和原子力显微镜的研究表明，许多一维组装的低分子量胶凝因子的细股形成的复合凝胶的情况下，连续冷却方法以及等温凝胶化方法。然而，较细的股线更均匀地分散在通过在适当的温度下的等温凝胶化制备的复合凝胶比那些连续冷却的方法。通过偏光显微镜观察，显示了链的分散状态的这种差异，对在theliquid结晶复合凝胶中的低分子量液晶的分子排列状态具有显著的影响。液晶复合凝胶对外加电场的电光响应，即光散射-透射转换，与凝胶因子的形态密切相关。通过等温凝胶化制备的复合材料实现了高对比度的光开关。在30 V rms下，电光开关的响应时间小于100 W s。
Liquid crystalline composite gels consisting of a low molecular weight gelator and a low molecular weight liquid crystal were prepared by two types of gelation method: (1) a continuous cooling method and (2) an isothermal gelating method, which provide different molecular self-assembling kinetics of the low molecular weight gelator in gelation processes. Optical microscopic and atomic force microscopic studies revealed that numerous fine strands of the one-dimensionally assembled low molecular weight gelators were formed in the composite gels in the case of the continuous cooling method as well as that of the isothermal gelating method. However, the thinner strands were more homogeneously dispersed in the composite gel prepared via the isothermal gelation at an appropriate temperature than those of the continuous cooling method. This difference on the dispersion state of the strands was shown, by polarizing optical microscopic observation, to have a significant influence on the molecular alignment state of the low-molecular-weight liquid crystal in theliquid crystalline composite gel. The electro-optical response, the light scattering-transmitting switching, of the liquid crystalline composite gel to an applied electric field was drastically dependent on the morphology of the gelators. High-contrast light switching was achieved for the composite prepared by the isothermal gelation. The response time of the electro-optical switching was less than 100 w s under 30 V rms .