Wetting and Nonwetting near a Tricritical Point,Physical Review Letters

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Wetting and Nonwetting near a Tricritical Point
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-11-22 , DOI: 10.1103/physrevlett.129.224501
Joseph O Indekeu ₁ , Kenichiro Koga ₂

Affiliation

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

H_{2} O

-oil-nonionic amphiphile mixtures in which nonwetting continues to exist as one approaches either one of the two critical endpoints.

中文翻译：

三临界点附近的润湿和非润湿

三流体相平衡界面之间的二面角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。三临界点 (TCP) 附近的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 的微小附近发现完全润湿。远离它，不润湿占优势并且没有发生润湿转变，即使接近临界终点也不会发生。远离 TCP，可能会发生重入润湿，具有不同的润湿阶段。这些发现揭示了迄今为止无法解释的三元实验