Islam Md Nazrul, Kato Teiji
Langmuir. 2005 Nov 22;21(24):10920-2. doi: 10.1021/la051563x.
The effect of temperature on the surface phase behavior in Langmuir monolayers of monomyristoyl-rac-glycerol (MMG) at the air-water interface has been studied by film balance and Brewster angle microscopy (BAM). It is observed that the domains of the MMG monolayers formed in the coexistence region between the liquid expanded (LE) and liquid condensed (LC) phases retain their circular shape over the studied temperature range, showing a sharp contrast to the temperature-dependent monolayer morphologies of amphiphilic systems where the shape of condensed domains changes either from compact circular to fingering or from irregular or spiral to compact patterns with increasing temperature. It is concluded that the system is capable of tuning the line tension of the interface by the effect of the increase in the hydrophobic character because of dehydration of the headgroup, which imparts to the molecules the properties of similar molecules but with less hydrophilic headgroups. As a result, the domains can retain their circular shape even up to the maximum possible temperature of the phase transition.
通过膜天平法和布鲁斯特角显微镜（BAM）研究了温度对单肉豆蔻酰 - 外消旋甘油（MMG）在空气 - 水界面的朗缪尔单分子层表面相行为的影响。观察到在液体扩张（LE）相和液体凝聚（LC）相之间的共存区域中形成的MMG单分子层的畴在研究的温度范围内保持其圆形形状，这与两亲体系中随温度变化的单分子层形态形成鲜明对比，在两亲体系中，随着温度升高，凝聚畴的形状从紧密圆形变为指状，或从不规则或螺旋形变为紧密图案。得出的结论是，由于头基脱水导致疏水性增加，该体系能够通过这种效应调节界面的线张力，这赋予分子与具有较少亲水头基的类似分子相似的性质。结果，即使在相变的最高可能温度下，畴也能保持其圆形形状。
