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Wetting layers caused by surface ionization in a near-critical binary liquid mixture

1988; American Physical Society; Volume: 38; Issue: 13 Linguagem: Inglês

10.1103/physrevb.38.9054

1095-3795

Dean C. Ripple, Xiao-Lun Wu, Carl Franck,

nanoparticles nucleation surface interactions

Kayser [Phys. Rev. Lett. 56, 1831 (1986)] has proposed that surface ionization provides the long-range force responsible for the wetting layers seen in the binary liquid mixture ${\mathrm{CS}}_{2}$+${\mathrm{CH}}_{3}$${\mathrm{NO}}_{2}$ on borosilicate glass substrates. We use scaling theory to find the equation of state for the near-critical mixtures, and then derive a free-energy functional for the wetting layer that incorporates surface ionization forces. This model includes critical adsorption effects and is well suited for calculations of wetting layers in the single-phase region. Within the uncertainties of the material properties, reflectivities of the glass-liquid interface derived from the theoretical concentration profiles do agree with experimental reflectivity values for wetting layers in the one-phase region. We confirm that surface ionization produces the dominant long-range force in ${\mathrm{CS}}_{2}$+${\mathrm{CH}}_{3}$${\mathrm{NO}}_{2}$ on glass.