Wetting in asymmetric quasi-2D systems
Wetting in asymmetric quasi-2D systems
复制标题
非对称准二维系统中的润湿
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
T. Fischer
中科院分区：
文献类型：
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作者：
Z. Khattari;P. Heinig;S. Wurlitzer;P. Steffen;M. Lösche;T. Fischer
研究了静电偶极相互作用对二维液滴润湿行为的影响。α取决于远离三相接触点的几何结构。理论上，我们发现亚稳α值与从完全润湿到部分脱湿的转变有关，这是由薄膜面积、共存相的表面电位或它们的线张力的微小变化引起的。这些预测在Langmuir单层模型系统中得到了实验证实。湿润不稳定性可能通过相间接触线的长度影响溶解在共存相中的蛋白质种之间的膜内生化反应，这是物种之间可能发生化学反应的唯一区域。
The effect of electrostatic dipole interactions on the wetting behavior of two-dimensional droplets, approximated by circular segment shapes with contact angle α, is investigated. α depends on the geometric structure far away from the three-phase contact point. We theoretically find metastable α values associated with transitions from complete wetting to partial dewetting, triggered by minute changes of the film area, the surface potential of the coexisting phases, or their line tensions. The predictions are confirmed experimentally in a Langmuir monolayer model system. The wetting instability may influence intramembrane biochemical reactions between protein species dissolved in coexisting phases via the length of the contact line between the phases, the only region where chemical reactions between the species are possible.