Kawase Tokuzo, Saito Isao, Oida Tatsuo
Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Kyoto, Japan.
J Oleo Sci. 2011;60(2):61-9. doi: 10.5650/jos.60.61.
Ester-type tartaric gemini amphiphiles bearing two carboxyl groups and two hydrophobic alkanoyl groups were prepared from L-tartaric acid, and the pressure-area (π-A) isotherms for a series of symmetric tartaric gemini amphiphiles were measured by the conventional film-balance technique. The effects of the length of the hydrophobic alkanoyl chains and of the subphase temperature (T(sub)) on the π-A isotherms for these compounds were examined. As the length of the hydrophobic alkyl chain increased, a more tightly packed monolayer was formed at the air-water interface. The melting temperature (T(m)) of the monolayer on the water surface was evaluated from the subphase temperature (T(sub)) dependence of the monolayer static elasticity ε(s), based on a π-A isotherm. A clear relationship between T(m) and hydrophobic carbon number (n) was observed for 2D monolayers of tartaric geminis on water surfaces, as well as for fatty acids and/or 3D solids.
由L-酒石酸制备了带有两个羧基和两个疏水链烷酰基的酯型酒石酸双子两亲分子，并采用传统的膜天平技术测量了一系列对称酒石酸双子两亲分子的压力-面积（π-A）等温线。研究了疏水链烷酰链长度和亚相温度（T(sub)）对这些化合物π-A等温线的影响。随着疏水烷基链长度的增加，在空气-水界面形成了更紧密堆积的单分子层。基于π-A等温线，根据单分子层静态弹性ε(s)对亚相温度（T(sub)）的依赖性，评估了水表面单分子层的熔化温度（T(m)）。对于水表面酒石酸双子的二维单分子层以及脂肪酸和/或三维固体，观察到T(m)与疏水碳原子数（n）之间存在明确的关系。
