掺杂对液晶磁场弗里德里克斯转变影响的探讨

Study of dopant influence on megnetic-field-induced Freedericksz transition of liquid crystal

采用相位延迟法 ,通过对分别掺入微量卟啉类物质、纤维蛋白质和双偶氮苯沿面排列 5CB液晶磁场弗里德里克斯转变的实验和数值计算 ,从实验和原理上探讨了微量掺杂对沿面排列 5CB液晶磁场弗里德里克斯转变的影响 .数值计算结果与实验相符 ,呈现两种转变过程 .研究表明 ,掺杂物的磁学性质不同、分子的形状和大小不同对液晶弗里德里克斯转变和弗里德里克斯转变阈值的影响不同 .进一步的掺杂 2 benzothiazolethiol_linkedporphyrinatozinc(Ⅱ )

The optical phase retardation method is used in this paper. Based on the experiments on magnetic_field_induced Freedericksz transition of planar nematic liqui d crystal, doped with trace bulin, fibre protein and double_azo etc, the trace adulteration effects on the transition of planar nematic liquid cryst al are discussed; experimental curves and nu merical calculation curves are given. Numerical calculation results are in agree ment with measured results. It is shown that different impurities whose mag netic property, molecule shape and size are different, lead to differe nt magn etic_field_induced Freedericksz transition, which is ulteriorly illuminated with the experiment on magnetic_field_induced Freedericksz transition of planar nema tic liquid crystal doped with 2_benzothiazolethiol_linked porphyrinatozinc(Ⅱ) .