Filling and wetting transitions of nematic liquid crystals on sinusoidal substrates
| Autor: | Chi-Tuong Pham, Pedro Patrício, Nuno Silvestre, José M. Romero-Enrique |
|---|---|
| Přispěvatelé: | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
| Rok vydání: | 2011 |
| Předmět: |
Phase transition
Materials science Layer FOS: Physical sciences Water Substrate (electronics) Condensed Matter - Soft Condensed Matter 01 natural sciences 010305 fluids & plasmas Surfaces Adsorption Wetting transition Chemical physics Liquid crystal 0103 physical sciences Soft Condensed Matter (cond-mat.soft) Molecule Wetting Phase-Transition 010306 general physics Layer (electronics) Films |
| Zdroj: | idUS. Depósito de Investigación de la Universidad de Sevilla instname Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | Close to sinusoidal substrates, simple fluids may undergo a filling transition, in which the fluid passes from a dry to a filled state, where the interface remains unbent but bound to the substrate. Increasing the surface field, the interface unbinds and a wetting transition occurs. We show that this double-transition sequence may be strongly modified in the case of ordered fluids, such as nematic liquid crystals. Depending on the preferred orientation of the nematic molecules at the structured substrate and at the isotropic-nematic interface, the filling transition may not exist, and the fluid passes directly from a dry to a complete-wet state, with the interface far from the substrate. More interestingly, in other situations, the complete wetting transition may be prevented, and the fluid passes from a dry to a filled state, and remains in this configuration, with the interface always attached to the substrate, even for very large surface fields. Both transitions are observed only for a same substrate in a narrow range of amplitudes |
| Databáze: | OpenAIRE |
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