Controlling the Formation of Capillary Bridges in Binary Liquid Mixtures
Controlling the Formation of Capillary Bridges in Binary Liquid Mixtures
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DOI：
10.1021/la103062s
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发表时间：
2010-11-16
期刊：
影响因子：
3.9
通讯作者：
Herminghaus, Stephan
中科院分区：
文献类型：
--
作者：
Goegelein, Christoph;Brinkmann, Martin;Herminghaus, Stephan
我们使用明场和共聚焦显微镜研究了浸入二元液体混合物中的微米级玻璃球之间毛细桥的形成。由于亲水性玻璃表面被富水相优先润湿，在加热时形成桥。如果系统被冷却到低于分层温度，则桥在几秒钟内通过分子间扩散消失。因此，该系统提供了打开和关闭桥的机会，并通过在方便的范围内改变温度来精确地调节桥体积。我们测量桥的几何形状作为一个函数或温度从明场图像和计算的凝聚力。讨论了溶剂组成对成桥温度、毛细管力强度的影响。和桥梁体积增长率。此外，我们发现，发病的桥梁形成相吻合的水-二甲基吡啶散装共存曲线。
We study the formation of capillary bridges between micrometer-sized glass spheres immersed in a binary liquid mixture using bright field and confocal microscopy. The bridges form upon heating due to the preferential wetting of the hydrophilic glass surface by the water-rich phase. If the system is cooled below the demixing temperature, the bridges disappear within a few seconds by intermolecular diffusion. Thus, this system oilers the opportunity to switch the bridges on and off and to tune precisely the bridge volume by altering the temperature in a convenient range. We measure the bridge geometry as a function or the temperature from bright field images and calculate the cohesive force. We discuss the influence of the solvent composition on the bridge formation temperature, the strength of the capillary force. and the bridge volume growth rate. Furthermore, we find that the onset of bridge formation coincides with the water-lutidine bulk coexistence curve.