Simulação do comportamento superhidrofóbico em rampas de pilares

Detalhes bibliográficos
Ano de defesa: 2014
Autor(a) principal: Lopes, Daisiane Molinos lattes
Orientador(a): Mombach, Jose Carlos Merino lattes
Banca de defesa: Thomas, Gilberto Lima, Villetti, Marcos Antonio
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Santa Maria
Centro de Ciências Naturais e Exatas
Programa de Pós-Graduação: Programa de Pós-Graduação em Física
Departamento: Física
País: Brasil
Palavras-chave em Português:
Física
Área do conhecimento CNPq:
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
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.
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spelling 2021-08-17T18:24:15Z2021-08-17T18:24:15Z2014-08-28http://repositorio.ufsm.br/handle/1/21976We 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.Neste trabalho apresentamos uma simulação bidimensional baseada no modelo celular de Potts (CPM) sobre as propriedades de superfícies hidrofóbicas lisas e estruturada em pilares. Para que uma superfície tenha um comportamento superhidrofóbico, uma gota de água depositada sobre ela deverá ter: (I) alto valor do ângulo de contato (� > 150°), (II) baixa histerese do ângulo de contato (∆� < 10°) e (III) alta velocidade de deslize. Utilizando uma superfície lisa com caráter hidrofóbico, modificamos a sua estrutura com o objetivo de obtermos uma superfície com caráter superhidrofóbico. Estruturamos essa superfície com pilares e variamos a distância (b) e a altura dos pilares (h) para analisar como esses parâmetros podem influenciar no fenômeno da superhidrofobicidade. Ainda analisamos como o parâmetro � (relacionado ao inverso da compressibilidade do líquido) o parâmetro de flutuação (T) e a gravidade interferem no sistema. Observamos que a fração de contato entre o sólido e o líquido (�) tem forte influência sobre a superhidrofobicidade como mencionado nos itens I, II e III acima. Desse estudo foi possível determinar uma região de valores de �, onde o comportamento superhidrofóbico é intensificado, ou seja I, II e III são satisfeitos. No estudo da transição de estados analisamos como a variação dos parâmetros do modelo influenciam na passagem de Cassie para Wenzel. Os resultados obtidos em nossas simulações são coerentes com os resultados experimentais encontrados na literatura.porUniversidade Federal de Santa MariaCentro de Ciências Naturais e ExatasPrograma de Pós-Graduação em FísicaUFSMBrasilFísicaAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessFísicaCNPQ::CIENCIAS EXATAS E DA TERRA::FISICASimulação do comportamento superhidrofóbico em rampas de pilaresSimulation behaviour of superhydrophobic in ramps pillarsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisMombach, Jose Carlos Merinohttp://lattes.cnpq.br/7661373078999069Thomas, Gilberto LimaVilletti, Marcos Antoniohttp://lattes.cnpq.br/7262730172725803Lopes, Daisiane Molinos1005000000066006006006003f068138-f520-468d-b0ab-7f831fb457331bfa7efb-1b82-447d-ad6e-051fa89efa774ade7b4d-d2d2-4bed-b63e-6f688df6c741df06cb3e-5d01-4d9a-982f-4eb4aa98ed7ereponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALDIS_PPGFISICA_2014_LOPES_DAISIANE.pdfDIS_PPGFISICA_2014_LOPES_DAISIANE.pdfDissertação de Mestradoapplication/pdf2076219http://repositorio.ufsm.br/bitstream/1/21976/1/DIS_PPGFISICA_2014_LOPES_DAISIANE.pdf00e4a72c62aba3042640aef0eede3b0cMD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; 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dc.title.por.fl_str_mv Simulação do comportamento superhidrofóbico em rampas de pilares
dc.title.alternative.eng.fl_str_mv Simulation behaviour of superhydrophobic in ramps pillars
title Simulação do comportamento superhidrofóbico em rampas de pilares
spellingShingle Simulação do comportamento superhidrofóbico em rampas de pilares
Lopes, Daisiane Molinos
Física
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
title_short Simulação do comportamento superhidrofóbico em rampas de pilares
title_full Simulação do comportamento superhidrofóbico em rampas de pilares
title_fullStr Simulação do comportamento superhidrofóbico em rampas de pilares
title_full_unstemmed Simulação do comportamento superhidrofóbico em rampas de pilares
title_sort Simulação do comportamento superhidrofóbico em rampas de pilares
author Lopes, Daisiane Molinos
author_facet Lopes, Daisiane Molinos
author_role author
dc.contributor.advisor1.fl_str_mv Mombach, Jose Carlos Merino
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/7661373078999069
dc.contributor.referee1.fl_str_mv Thomas, Gilberto Lima
dc.contributor.referee2.fl_str_mv Villetti, Marcos Antonio
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/7262730172725803
dc.contributor.author.fl_str_mv Lopes, Daisiane Molinos
contributor_str_mv Mombach, Jose Carlos Merino
Thomas, Gilberto Lima
Villetti, Marcos Antonio
dc.subject.por.fl_str_mv Física
topic Física
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
dc.subject.cnpq.fl_str_mv CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
description 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.
publishDate 2014
dc.date.issued.fl_str_mv 2014-08-28
dc.date.accessioned.fl_str_mv 2021-08-17T18:24:15Z
dc.date.available.fl_str_mv 2021-08-17T18:24:15Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
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dc.identifier.uri.fl_str_mv http://repositorio.ufsm.br/handle/1/21976
url http://repositorio.ufsm.br/handle/1/21976
dc.language.iso.fl_str_mv por
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dc.rights.driver.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Universidade Federal de Santa Maria
Centro de Ciências Naturais e Exatas
dc.publisher.program.fl_str_mv Programa de Pós-Graduação em Física
dc.publisher.initials.fl_str_mv UFSM
dc.publisher.country.fl_str_mv Brasil
dc.publisher.department.fl_str_mv Física
publisher.none.fl_str_mv Universidade Federal de Santa Maria
Centro de Ciências Naturais e Exatas
dc.source.none.fl_str_mv reponame:Biblioteca Digital de Teses e Dissertações do UFSM
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