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首页> 外文期刊>Chemistry: A European journal >Aggregation and layering transitions in thin films of X-, T-, and anchor-shaped bolaamphiphiles at the air-water interface
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Aggregation and layering transitions in thin films of X-, T-, and anchor-shaped bolaamphiphiles at the air-water interface

机译：X，T和锚定型两亲性薄膜在空气-水界面处的聚集和分层转变

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摘要

Aggregation in Langmuir films is usually understood as being a disorderly grouping of molecules turning into chaotic three-dimensional aggregates and is considered an unwanted phenomenon causing irreversible changes. In this work we present the studies of 11 compounds from the group of specific surfactants, known as bolaamphiphiles, that exhibit reversible aggregation and, in many cases, transition to well-defined multilayers, which can be considered as a layering transition. These bolaamphiphiles incorporate rigid π-conjugated aromatics as hydrophobic cores, glycerol-based polar groups and hydrophobic lateral chains. Molecules of different shapes (X-, T-, and anchor) were studied and compared. The key property of these compounds is the partial fluorination of the lateral chains linked to the rigid cores of the molecules. The most interesting feature of the compounds is that, depending on their shape and degree of fluorination, they are able to resist aggregation and preserve a monolayer structure up to relatively high surface pressures (T-shaped and some X-shaped molecules), or create well-defined trilayers (X- and anchor-shaped molecules). Experimental studies were performed using Langmuir balance, surface potential and X-ray reflectivity measurements.
机译：通常将Langmuir薄膜中的聚集理解为无序排列的分子，它们变成了混乱的三维聚集体，被认为是引起不可逆变化的有害现象。在这项工作中，我们提供了11种化合物的研究，这些化合物来自特定的表面活性剂（称为双亲两亲物），它们具有可逆的聚集作用，并且在许多情况下，过渡到定义明确的多层结构，可以将其视为分层过渡。这些双亲两性亲戚结合了刚性的π-共轭芳族化合物作为疏水核，甘油基极性基团和疏水性侧链。研究并比较了不同形状（X，T和锚定）的分子。这些化合物的关键特性是与分子的刚性核连接的侧链的部分氟化。化合物最有趣的特征是，根据它们的形状和氟化程度，它们能够抵抗聚集并在相对较高的表面压力（T形和一些X形分子）下保持单层结构，或者形成定义明确的三层（X形和锚形分子）。使用朗缪尔天平，表面电势和X射线反射率测量进行了实验研究。

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