DSC study of phase transitions of cephalin pseudo-binary systems in excess water  

作　　者：王邦宁 谈夫 

出　　处：《Science China Chemistry》1999年第1期8-13,共6页中国科学（化学英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 29573097)

摘　　要：The gel-liquid crystal phase transitions of the pseudo-binary systems of cephalins DMPE and DHPE in excess water were studied by differential scanning calorimetry. The phase diagram of the pseudebinary systems has been given. The experiments showed that the partial phase separation in gel phase might occur at least at the mole fractions of DHPE below 0.1. The analysis by the model of ideal solution showed that both the cephalins were non-ideally miscible both in the gel phases and in the liquid crystal phases. The analysis by the model of regular solution showed that all the non-ideality parameters in the gel phases were larger than those in the liquid crystal phases at the same temperature. All the non-ideality parameters were not constant, but rather dependent on temperature.The gel-liquid crystal phase transitions of the pseudo-binary systems of cephalins DMPE and DHPE in excess water were studied by differential scanning calorimetry. The phase diagram of the pseudo-binary systems has been given. The experiments showed that the partial phase separation in gel phase might occur at least at the mole fractions of DHPE below 0.1. The analysis by the model of ideal solution showed that both the cephalins were non-ideally miscible both in the gel phases and in the liquid crystal phases. The analysis by the model of regular solution showed that all the non-ideality parameters in the gel phases were larger than those in the liquid crystal phases at the same temperature. All the non-ideality parameters were not constant, but rather dependent on temperature.

关 键 词：1  2-dimyristoyl phosphatidylethanolamine 1  2-di-n-heptadecanoyl phosphatldylethanolamine phase transition phase diagram differential scanning calorimetry 

分 类 号：O642[理学—物理化学]