Strong Dependence of Contact Angle on Pressure
Strong Dependence of Contact Angle on Pressure
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DOI：
10.1134/s0012501619070017
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发表时间：
2019-07-01
影响因子：
0.9
通讯作者：
Sobolev, V. D.
中科院分区：
文献类型：
--
作者：
Rusanov, A. I.;Esipova, N. E.;Sobolev, V. D.
尽管常压通常会轻微影响凝聚相及其表面层的性质，但在表面的物理化学中发现了相当大的压敏量。这是接触角。在实验中，气泡粘在水中的固体表面上，流体静压力增加不到一倍，接触角增加超过10度，条件是接触角充分小于90度。在这些变化期间，三相接触线保持不动，并且该过程仅减少到液-气界面的取向的变化。如果这个角度（无论是锐角还是钝角）接近90度，三相接触线就会变成移动的，作为达到平衡的另一种方式。为了解释这些现象，热力学理论被公式化。结果表明，如果三相接触线是不动的，在液体中的压力的增加总是导致接触角的增加。
Despite the fact that ordinary pressures typically slightly affect the properties of condensed phases and their surface layers, quite a pressure-sensitive quantity was found in the physical chemistry of surfaces. This is contact angle. In experiments with an air bubble stuck to a solid surface in water, a less than double increase in the hydrostatic pressure led to a more than 10 degrees increase in the contact angle, provided that the contact angle was sufficiently less than 90 degrees. During these changes, the three-phase contact line remained immobile, and the process reduced only to a change in the orientation of the liquid-gas interface. If the angle (be it acute or obtuse) was close to 90 degrees, the three-phase contact line became mobile as an alternative way to reach equilibrium. To explain these phenomena, a thermodynamic theory was formulated. It was shown that, if the three-phase contact line is immobile, an increase in the pressure in the liquid always causes an increase in the contact angle.