Journal
FLUID PHASE EQUILIBRIA
Volume 531, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.fluid.2020.112909
Keywords
Phase transition; Associating fluid; Slit pore; Functionalized surface
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The vapour-liquid phase equilibria of associating fluids under confinement were investigated using the GC-TMMC method. The role of surface sites on the phase behavior was critically examined, which significantly affected the structural behavior of coexistence phases. Near a functionalized surface, the orientation of associating fluid molecules was entirely different compared to a smooth surface.
Vapour-liquid phase equilibria of associating fluids under confinement are investigated using Grand-Canonical Transition Matrix Monte Carlo (GC-TMMC) method. Various properties of coexistence phases and critical properties are estimated for multiple associating fluids at different slit widths. The structural features of coexistence phases are examined through monomer fraction, density profile, and orientation profile. The role of surface sites on the phase behaviour under confinement is critically examined. It has a significant effect on the structural behaviour of coexistence phases, leading to a change in the properties of coexistence phases. In particular, the orientation of associating fluid molecules near the functionalized surface is entirely different than in the case of a smooth surface. The orientation of two sites associating (when sites are located oppositely to each other) fluid molecules is normal to surface, forming bonds with surface sites in one direction and another bond with molecules in an adjacent layer. (C) 2020 Published by Elsevier B.V.
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