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Electro-osmosis in kaolinite with pH-dependent surface charge modelling by homogenization Anais da ABC (AABC)
Lima,Sidarta A.; Murad,Marcio A.; Moyne,Christian; Stemmelen,Didier.
A new three-scale model to describe the coupling between pH-dependent flows and transient ion transport, including adsorption phenomena in kaolinite clays, is proposed. The kaolinite is characterized by three separate nano/micro and macroscopic length scales. The pore (micro)-scale is characterized by micro-pores saturated by an aqueous solution containing four monovalent ions and charged solid particles surrounded by thin electrical double layers. The movement of the ions is governed by the Nernst-Planck equations, and the influence of the double layers upon the flow is dictated by the Helmholtz-Smoluchowski slip boundary condition on the tangential velocity. In addition, an adsorption interface condition for the Na+ transportis postulated to capture its...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Electrical double layer; Electro-osmosis; Homogenization; Kaolinite; Nernst-Planck; Poisson-Boltzmann.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100016
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