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arXiv 1504.05698cond-mat.stat-mechcond-mat.mes-hallcond-mat.soft
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在锐角和开放楔形中填充过渡

Filling transitions in acute and open wedges

Alexandr Malijevský, Andrew O. Parry

摘要:

我们提出了一阶和连续填充过渡的数值研究,在楔形的任意开口角$ψ$,使用微观基本措施密度泛函模型与短程流体流体力和长程壁流体力。在该系统中,无论壁面流体势$\varepsilon_w$的强度如何,平面壁面流体界面的润湿转变特性总是一阶的。然而,在楔形几何形状中,填充过渡的顺序不仅取决于$\varepsilon_w$,而且取决于开口角$ψ$。特别是,我们表明,即使润湿过渡是强烈的一阶填充过渡是连续的足够尖锐的楔形。我们进一步表明,在过渡的顺序发生的变化,通过一个三临界点,而不是一个关键的终点。这些结果扩展了以前的有效哈密顿预测仅限于浅楔。

英文摘要:

We present numerical studies of first-order and continuous filling transitions, in wedges of arbitrary opening angle $ψ$, using a microscopic fundamental measure density functional model with short-ranged fluid-fluid forces and long-ranged wall-fluid forces. In this system the wetting transition characteristic of the planar wall-fluid interface is always first-order regardless of the strength of the wall-fluid potential $\varepsilon_w$. In the wedge geometry however the order of the filling transition depends not only on $\varepsilon_w$ but also the opening angle $ψ$. In particular we show that even if the wetting transition is strongly first-order the filling transition is continuous for sufficient acute wedges. We show further that the change in the order of the transition occurs via a tricritical point as opposed to a critical-end point. These results extend previous effective Hamiltonian predictions which were limited only to shallow wedges.

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