Wetting and Nonwetting near a Tricritical Point
Wetting and Nonwetting near a Tricritical Point
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三临界点附近的润湿和不润湿
DOI：
10.1103/physrevlett.129.224501
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发表时间：
2022
影响因子：
8.6
通讯作者：
Koga Kenichiro
中科院分区：
文献类型：
--
作者：
Indekeu Joseph O.;Koga Kenichiro
三相平衡中界面之间的二面接触角必须是整体热力学场的连续函数。我们提出的这个一般论点预测了相图中的非润湿间隙，挑战了“临界点润湿”的普遍信念，即使对于短程力也是如此。通过三临界点 (TCP) 附近三相平衡的平均场双密度泛函理论的精确解提供了演示。在 TCP 的一小部分区域发现完全润湿。远离它，不润湿占主导地位，并且不会发生润湿转变，即使接近临界终点也不会发生。远离 TCP 时，可能会发生重入润湿，并具有不同的润湿相。这些发现揭示了迄今为止无法解释的三元油非离子两亲物混合物的实验，其中当接近两个关键终点之一时，不润湿性继续存在。
The dihedral contact angles between interfaces in three-fluid-phase equilibria must be continuous functions of the bulk thermodynamic fields. This general argument, which we propose, predicts a nonwetting gap in the phase diagram, challenging the common belief in “critical-point wetting,” even for short-range forces. A demonstration is provided by exact solution of a mean-field two-density functional theory for three-phase equilibria near a tricritical point (TCP). Complete wetting is found in a tiny vicinity of the TCP. Away from it, nonwetting prevails and no wetting transition takes place, not even when a critical endpoint is approached. Far from the TCP, reentrant wetting may occur, with a different wetting phase. These findings shed light on hitherto unexplained experiments on ternary-oil-nonionic amphiphile mixtures in which nonwetting continues to exist as one approaches either one of the two critical endpoints.