Abstract

A unified description of three types of two-phase interfaces (vapor–liquid, solid–vapor, and solid–liquid) at a vapor–liquid meniscus inside a slit-like pore are considered on the basis of the lattice gas model. This approach allows equally accurate calculations of molecular distributions in heterogeneous distributed models of transitional regions at all interfaces. It is assumed that pore walls cannot be deformed, and they create an external field for a stratifying fluid. Adsorption films form at solid–mobile phase interfaces due to the potential of adsorbate–adsorbent interaction. The state of the coexisting vapor-in-a-pore and liquid-in-a-pore phases satisfy the equality of the chemical potential that excludes the appearance of metastable states. Conditions for distinguishing regions of the system that lie beyond solid–liquid–vapor three-phase contact are discussed. A procedure is discussed for introducing a contact angle into a liquid–vapor–solid pore wall system through molecular distributions of the adsorbate in a slit-like pore. Dependences of the width of the considered interfaces and the contact angle as a function of the pore width and pore wall potential are found.

中文翻译：

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层状气孔在三个界面的分层汽液系统中的分子分布

摘要

基于晶格气模型，考虑了狭缝状孔隙内气液弯月面的三种类型的两相界面的统一描述（气-液，固-气和固-液）。这种方法可以在所有界面的过渡区域的异构分布模型中同样精确地计算分子分布。假定孔壁不能变形，并且它们为分层流体创造了外部场。由于被吸附物与吸附剂相互作用的潜在作用，在固-流动相界面处形成吸附膜。孔内蒸气相和孔内液体相共存的状态满足排除亚稳态出现的化学势的相等性。讨论了区分系统范围超出固液汽三相接触的条件。通过缝隙状孔隙中吸附物的分子分布，讨论了将接触角引入液-气-固孔壁系统的程序。发现所考虑的界面的宽度和接触角与孔宽度和孔壁电势的关系。