热致液晶CPHOB的有序参数与核磁共振弛豫  

ORDER PARAMETER AND NMR RELAXATION OF THERMOTROPIC LIQUID CRYSTAL CPHOB

作　　者：孟庆安[1] 胡传民[1] 曹琪娟 李子荣[1] 

机构地区：[1]中国科学院物理研究所磁学国家重点实验室

出　　处：《物理学报》1997年第10期1961-1964,共4页Acta Physica Sinica

基　　金：国家自然科学基金

摘　　要：从室温至３８０Ｋ测量了热致液晶４己氧基苯甲酸４氰基苯酯（ＣＰＨＯＢ）的氢核磁共振谱．其固态至向列相的转变温度Ｔｓｎ＝３４７Ｋ，向列相至各向同性液体的转变温度Ｔｎｉ＝３５９Ｋ．得到了液晶态有序参数的温度关系．讨论了氢核磁共振的自旋晶格弛豫机制．Abstract The proton magnetic resonance spectra of 4 cyanophenyl 4′ hexyloxy benzoate (CPHOB) were measured from room temperature to 380K. It was found that the transition temperature from solid to nematic phase was T sn =347K, and the transition temperature from nematic phase to isotropic liquid T ni =359K. The temperature dependence of its order parameter was evaluated. Its mechanism of proton spin lattice relaxation was discussed.

关 键 词：液晶 热致液晶 CPHOB 有序参数 核磁共振弛豫 

分 类 号：O753.2[理学—晶体学]