PMID: 22587101May 17, 2012Paper

Phase separation in fluids exposed to spatially periodic external fields

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
R L C Vink, A J Archer

Abstract

When a fluid is confined within a spatially periodic external field, the liquid-vapor transition is replaced by a different transition called laser-induced condensation (LIC) [Götze et al., Mol. Phys. 101, 1651 (2003)]. In d=3 dimensions, the periodic field induces an additional phase, characterized by large density modulations along the field direction. At the triple point, all three phases (modulated, vapor, and liquid) coexist. At temperatures slightly above the triple point and for low (high) values of the chemical potential, two-phase coexistence between the modulated phase and the vapor (liquid) is observed; by increasing the temperature further, both coexistence regions terminate in critical points. In this paper, we reconsider LIC using the Ising model to resolve a number of open issues. To be specific, we (1) determine the universality class of the LIC critical points and elucidate the nature of the correlations along the field direction, (2) present a mean-field analysis to show how the LIC phase diagram changes as a function of the field wavelength and amplitude, (3) develop a simulation method by which the extremely low tension of the interface between modulated and vapor or liquid phase can be measured, (4) present...Continue Reading

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Citations

Mar 18, 2015·Soft Matter·A A VerhoeffR P A Dullens
Jul 16, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·A CocliteA Lamura
Aug 16, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Jennifer Galanis, Yoav Tsori

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