Amphiphilic planar membranes in ionic equilibrium: a study of pH position-dependent values

Journal of the Brazilian Chemical Society

Guilherme V. Bossa¹  Davi R. Ratero¹  Augusto A. Neto¹  Alfred Fahr²  Tereza P. Souza¹ 

[1] ,Universidade Estadual Paulista Júlio de Mesquita Filho Instituto de Biociências, Letras e Ciências Exatas São José do Rio Preto SP ,Brazil

关键词: pH control;    ionic concentration;    amphiphilic;    Poisson-Boltzmann equation;   

DOI  :  10.5935/0103-5053.20140077

来源: SciELO

【 摘 要 】

The pH values near a planar dissociating membrane are studied under a mean field approximation using the Poisson-Boltzmann equation and its linear form. The equations are solved in planar symmetry with the consideration that the charge density on the dissociating membrane surface results from an equilibrium process with the neighboring electrolyte. Results for the membrane dissociation degree are presented as a function of the electrolyte ionic strength and membrane surface charge density. Our calculations indicate that pH values have an appreciable variation within 2 nm from the membrane. It is shown that the dissociation process is enhanced due to the presence of bivalent ions and that pH values acquire better stability than in an electrolyte containing univalent ions.

【 授权许可】

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