NDLI: Surface Adsorption and Orientation Near the Critical Point of Binary Liquid Mixtures

Content Provider	Springer Nature Link
Author	Cho, J. H. J. Law, B. M. Carpenter, J. H.
Copyright Year	2004
Abstract	Critical binary liquid mixtures have proven to be extremely useful for quantitatively studying wetting and adsorption phenomena that occur at the surfaces of these systems. In this paper recent experimental developments in our understanding of adsorption gained via the study of critical mixtures are reviewed. At the noncritical liquid/vapor surface the component possessing the smallest surface tension completely saturates this surface for sufficiently large surface tension differences Δσ between the two components. This complete (or strong) adsorption is described by a universal scaling function P which depends upon the dimensionless depth z/ξ where ξ is the correlation length. Weakly polar and nonpolar binary liquid mixtures have been used to define the scaling function P. If the surface energy difference Δ σ between the two components is small, then the surface is no longer completely saturated by one component. In this weak adsorption egime the adsorption behavior is now described by a universal function G of both z/ξ and Δ σ. The functional dependence of G is elucidated by examining a homologous series of critical binary AB liquid mixtures where component A is an n-alkane while component B (methyl formate) is fixed. For this system Δ σ changes sign with increasing n-alkane chain length. In addition to adsorption, dipole surface orientational order at the liquid/vapor surface of highly polar + nonpolar mixtures is also discussed. This orientational order is induced by the dipole-image dipole interaction in the vicinity of a surface.
Starting Page	1449
Ending Page	1459
Page Count	11
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	25
Issue Number	5
e-ISSN	15729567
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2004-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Mechanics Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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