Simulação do comportamento superhidrofóbico em rampas de pilares

Detalhes bibliográficos
Ano de defesa: 2014
Autor(a) principal: Lopes, Daisiane Molinos
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Santa Maria
Brasil
Física
UFSM
Programa de Pós-Graduação em Física
Centro de Ciências Naturais e Exatas
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://repositorio.ufsm.br/handle/1/21976
Resumo: We present a two-dimensional simulation based on the cellular Potts model (CPM) of the properties of smooth and pillar structured hydrophobic surfaces. For a surface having superhidrophobic behavior, a drop of water deposited on it should have: (I) high-value of contact angle ( ), (II) low hysteresis ( <10°) and (III) high sliding speed. Using a smooth surface with hydrophobic character we modify its structure for the purpose to obtain a surface with superhydrophobic character. On this structured surface with pillars we varied the distance (b) and the height of the pillars (h) to analyze how these parameters can influence the superhydrophobic phenomenon. We also analyzed how the parameter (related to the inverse of the compressibility of the liquid), the parameter fluctuation (T) and gravity interfere in the system. We observed that the contact fraction (f) between the liquid and the solid has strong influence on superhydrophobicity as mentioned in items I, II and III above. This study was able to determine a region of values f, where superhydrophobic behavior is intensified, i.e, I, II and III are satisfied. In the study of state transition we analyze how the variation of the model parameters influence the passage from Cassie to Wenzel states. The results obtained in our simulations are consistent with experimental results found in literature.