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arXiv 2401.04641cond-mat.softcond-mat.stat-mechnlin.CG
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二元液体混合物在表面上的结合势与润湿行为

Binding potential and wetting behaviour of binary liquid mixtures on surfaces

Mounirah Areshi, Dmitri Tseluiko, Uwe Thiele, Benjamin D. Goddard, Andrew J. Archer

AI总结:

本研究基于经典密度泛函理论提出适用于互溶及不互溶二元液体混合物的基底界面润湿相行为理论,揭示了体相行为与基底作用的相互作用可催生多样界面相行为,还给出了结合势形式与液滴分布。

摘要:

我们提出了一种关于二元液体混合物在刚性固体基底上的界面润湿相行为的理论,该理论同时适用于互溶和不互溶混合物。具体而言,我们计算了结合势随吸附量(即两种液体各自在基底上的超额量)变化的函数关系,结合势可完整描述相应的界面热力学性质。我们的研究方法基于经典密度泛函理论(classical density functional theory)。二元液体混合物可呈现复杂的体相行为,包括液-液相分离与汽-液相分离,具体取决于两种不同液体所有粒子间的相互作用性质、温度以及化学势。本研究表明,混合物体相行为与基底相互作用特性之间的相互作用会催生丰富多样的界面相行为,涵盖混合与去混合情形。我们发现最终状态可存在最多三种不同相共存的情况。我们明确了靠近基底的液体密度分布如何随相互作用参数变化,以及这些分布如何决定结合势的形式——在某些情况下,结合势可以是吸附量的多值函数。我们还给出了互溶与不互溶二元液体的固着液滴(sessile droplets)的密度分布。

英文摘要:

We present a theory for the interfacial wetting phase behaviour of binary liquid mixtures on rigid solid substrates, applicable to both miscible and immiscible mixtures. In particular, we calculate the binding potential as a function of the adsorptions, i.e. the excess amounts of each of the two liquids at the substrate. The binding potential fully describes the corresponding interfacial thermodynamics. Our approach is based on classical density functional theory. Binary liquid mixtures can exhibit complex bulk phase behaviour, including both liquid-liquid and vapour-liquid phase separation, depending on the nature of the interactions between all the particles of the two different liquids, the temperature and the chemical potentials. Here we show that the interplay between the bulk phase behaviour of the mixture and the properties of the interactions with the substrate gives rise to a wide variety of interfacial phase behaviours, including mixing and demixing situations. We find situations where the final state is a coexistence of up to three different phases. We determine how the liquid density profiles close to the substrate change as the interaction parameters are varied and how these determine the form of the binding potential, which in certain cases can be a multi-valued function of the adsorptions. We also present profiles for sessile droplets of both miscible and immiscible binary liquids.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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