Selivanova N M, Konov A B, Romanova K A, Gubaidullin A T, Galyametdinov Yu G
Physical and Colloid Chemistry Department, Kazan National Research Technological University, 68 Karl Marks Street, Kazan 420015, Russia.
Soft Matter. 2015 Oct 21;11(39):7809-16. doi: 10.1039/c5sm01371b. Epub 2015 Aug 28.
This paper provides the results of POM, DSC and XRPD methods characterizing the liquid crystalline behaviour, thermal properties and structural parameters of lyotropic systems based on a nonionic surfactant and lanthanum nitrate (La(3+)). The systems based on tetraethylene glycol monododecyl ether (C12EO4) and lanthanum nitrate have been demonstrated to form a lamellar phase. The concentration and temperature ranges of the existence of mesophases as well as thermodynamic parameters of phase transitions have been estimated. The structural parameters of the lamellar phase of the C12EO4/La(3+)/water systems have been determined using X-ray diffraction. The model of molecular packing in lamellar lanthanide-containing lyotropic mesophases was proposed for the observed patterns of structural parameters obtained at various water contents. NMR (1)H with a pulsed magnetic field gradient has been used to characterize molecular motions in the C12EO4/La(3+)/H2O systems with different water contents.
本文给出了偏光显微镜（POM）、差示扫描量热法（DSC）和X射线粉末衍射法（XRPD）对基于非离子表面活性剂和硝酸镧（La(3+)）的溶致体系的液晶行为、热性质和结构参数进行表征的结果。基于四乙二醇单十二烷基醚（C12EO4）和硝酸镧的体系已被证明能形成层状相。已估算了中间相存在的浓度和温度范围以及相变的热力学参数。利用X射线衍射确定了C12EO4/La(3+)/水体系层状相的结构参数。针对在不同水含量下获得的结构参数的观测模式，提出了含镧层状溶致中间相分子堆积模型。具有脉冲磁场梯度的核磁共振（1）H已用于表征不同水含量的C12EO4/La(3+)/H2O体系中的分子运动。
