Institut für Physikalische Chemie II, Technische Universität Dortmund, Dortmund, Germany.
Langmuir. 2012 Aug 28;28(34):12438-42. doi: 10.1021/la302090k. Epub 2012 Aug 16.
This study focuses on the modular synthesis of a new class of nonionic dendritic amphiphiles and their behavior at the water-air interface. Our approach is based on a modular architecture consisting of two different generations of hydrophilic polyol dendrons connected to a two-chain hydrophobic block. Caused by different polarities of polyol and aliphatic groups, the molecules are surface-active and, by analogy to phospholipids, can form well-organized Langmuir monolayers at the water surface. The self-association process and phase behavior of these molecules with two different headgroup sizes were investigated by means of surface pressure and surface potential area isotherms by surface shear rheology and Brewster angle microscopy. With these techniques, we were able to observe marked differences in the phase behavior of the two molecular generations.
本研究专注于一类新型非离子树枝状两亲分子的模块化合成及其在水-气界面的行为。我们的方法基于由两个不同代亲水多元醇树突连接到一个双链疏水嵌段组成的模块化架构。由于多元醇和脂肪族基团的极性不同，这些分子具有表面活性，并且可以类比于磷脂，在水面上形成组织良好的 Langmuir 单分子层。通过表面剪切流变学和布儒斯特角显微镜，使用表面压和表面电势-面积等温线研究了这两种具有不同头基大小的分子的自组装过程和相行为。通过这些技术，我们能够观察到两代分子的相行为存在明显差异。
