Incorporation of molecular reorientation into modeling surface pressure-area isotherms of langmuir monolayers

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorNorth Dakota State University-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorAgudelo, José-
Autor(es): dc.creatorBossa, Guilherme Volpe [UNESP]-
Autor(es): dc.creatorMay, Sylvio-
Data de aceite: dc.date.accessioned2022-08-04T22:11:25Z-
Data de disponibilização: dc.date.available2022-08-04T22:11:25Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2021-07-02-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.3390/molecules26144372-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/222097-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/222097-
Descrição: dc.descriptionLangmuir monolayers can be assembled from molecules that change from a low-energy orientation occupying a large cross-sectional area to a high-energy orientation of small cross-sectional area as the lateral pressure grows. Examples include cyclosporin A, amphotericin B, nystatin, certain alpha-helical peptides, cholesterol oxydation products, dumbbell-shaped amphiphiles, organic– inorganic nanoparticles and hybrid molecular films. The transition between the two orientations leads to a shoulder in the surface pressure-area isotherm. We propose a theoretical model that describes the shoulder and can be used to extract the energy cost per molecule for the reorientation. Our two-state model is based on a lattice–sublattice approximation that hosts the two orientations and a corresponding free energy expression which we minimize with respect to the orientational distribution. Inter-molecular interactions other than steric repulsion are ignored. We provide an analysis of the model, including an analytic solution for one specific lateral pressure near a point of inflection in the surface pressure-area isotherm, and an approximate solution for the entire range of the lateral pressures. We also use our model to estimate energy costs associated with orientational transitions from previously reported experimental surface pressure-area isotherms.-
Descrição: dc.descriptionDepartment of Physics North Dakota State University-
Descrição: dc.descriptionDepartment of Physics Institute of Biosciences Humanities and Exact Sciences São Paulo State University (UNESP)-
Descrição: dc.descriptionDepartment of Physics Institute of Biosciences Humanities and Exact Sciences São Paulo State University (UNESP)-
Idioma: dc.languageen-
Relação: dc.relationMolecules-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCyclosporin A-
Palavras-chave: dc.subjectFree energy-
Palavras-chave: dc.subjectIsotherm-
Palavras-chave: dc.subjectLangmuir monolayer-
Palavras-chave: dc.subjectLateral pressure-
Palavras-chave: dc.subjectNystatin-
Palavras-chave: dc.subjectReorientation-
Título: dc.titleIncorporation of molecular reorientation into modeling surface pressure-area isotherms of langmuir monolayers-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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