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Título
Water viscosity in confined nanoporous media and flow through nanofiltration membranes
Autor
Año del Documento
2020
Editorial
Elsevier
Descripción
Producción Científica
Documento Fuente
Microporous and Mesoporous Materials, 2020, vol. 303, 110289
Resumo
Nanofiltration flux and selectivity depend on the mass transfer through the nanometric pores. Among other factors, including charges and dielectric constant for the charged species, viscosity is of crucial relevance. Here we study how viscosity changes in confined media in the nanometric range. The models found in the literature, that assume that the ratio of the viscosity of water on the pore walls over that in bulk water is a constant, are totally unsatisfactory to predict the dependence of the Darcy constant on temperature.
Pure water flux is studied as a function of temperature for three commercial ceramic membranes. For these membranes, we fit flow versus temperature with a quite good fitting assuming that the first layer of water on the cylindrical pore walls move with a viscosity . If the flow is assumed to follow a Carman-Kozeny equation, according to its more realistic granular nature, the resulting porosity and mean grain size are in accordance with the data known and measured by atomic force microscopy (AFM).
Palabras Clave
Nanoconfined water
Agua nanoconfinada
Water viscosity
Viscosidad del agua
Nanofiltration
Nanofiltración
Ceramic membranes
Membranas cerámicas
ISSN
1387-1811
Revisión por pares
SI
Patrocinador
Gobierno de España (project MAT2016-76413-C2-1-R)
Junta de Castilla y León - Fondo Europeo de Desarrollo Regional (grants CLU2017-09, UIC082 and VA088G19)
Junta de Castilla y León - Fondo Europeo de Desarrollo Regional (grants CLU2017-09, UIC082 and VA088G19)
Propietario de los Derechos
© 2020 Elsevier
Idioma
eng
Tipo de versión
info:eu-repo/semantics/acceptedVersion
Derechos
openAccess
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