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K Rejmer

Publications and source records attributed to K Rejmer.

5 recordsLinked to original sources
PubMed2005

Coexistence at critical filling.

At the bulk liquid-gas coexistence the liquid film adsorbed on the corrugated substrate can exhibit a first-order thin-thick transition, provided the corrugation amplitude exceeds the critical value, specific for this kind of corrugation. We study the coexistence of thin and thick layer adsorbed on the sinusoidally corrugated substrate. We evaluate the line tension between these films in the vicinity of the filling critical temperature T(CF) . The line L tension is positive and vanishes at the filling critical point according to the power law L approximately ( T(CF) -T)(3/2) .

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PubMed2002

Roughness-induced filling.

We study adsorption of a fluid on a periodically corrugated substrate using the mean-field version of the effective Hamiltonian approach. We analyze the shape of the interface close to the wetting point of a planar substrate, and the free energy of the system as a function of temperature and amplitude of the corrugation for short-range and long-range interactions. We prove that the substrate roughness has no influence on the locus and order of the wetting transition, when the planar substrate of the same chemical composition as the corrugated one experiences critical wetting. For short-range interactions we observe the corrugation driven filling transition. We show analytically that a thin-thick first-order transition occurs when the corrugation amplitude of the substrate exceeds a critical value. The phase diagram of the adsorption on a sinusoidally corrugated substrate at the bulk liquid-gas coexistence is obtained.

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PubMed2000

Adsorption on a periodically corrugated substrate

Mean-field analysis of the effective interfacial Hamiltonian shows that with increasing temperature the adsorption on a periodically corrugated substrate can proceed in two steps: first, there is the filling transition in which the depressions of the substrate become partially or completely filled; then, there is the wetting transition at which the substrate as a whole becomes covered with a macroscopically thick wetting layer. The actual order and location of both transitions are related to the wetting properties of the corresponding planar substrate and to the form of corrugation. Certain morphological properties of the liquid-vapor interface in the case of a sawlike corrugated substrate are discussed analytically.

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PubMed1999

Filling transition for a wedge.

We study the formation and the shape of a liquid meniscus in a wedge with opening angle 2phi which is exposed to a vapor phase. By applying a suitable effective interface model, at liquid-vapor coexistence and at a temperature Tphi we find a filling transition at which the height of the meniscus becomes macroscopically large while the planar walls of the wedge far away from its center remain nonwet up to the wetting transition occurring at Tw>Tphi. Depending on the fluid and the substrate potential the filling transition can be either continuous or discontinuous. In the latter case it is accompanied by a prefilling line extending into the vapor phase of the bulk phase diagram and describing a transition from a small to a large, but finite, meniscus height. The filling and the prefilling transitions correspond to nonanalyticities in the surface and line contributions to the free energy of the fluid, respectively.

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