RT info:eu-repo/semantics/article
T1 Water viscosity in confined nanoporous media and flow through nanofiltration membranes
A1 Álvarez Quintana, Sara
A1 Carmona del Río, Francisco Javier
A1 Palacio Martínez, Laura
A1 Hernández Giménez, Antonio
A1 Prádanos del Pico, Pedro Lourdes
K1 Nanoconfined water
K1 Agua nanoconfinada
K1 Water viscosity
K1 Viscosidad del agua
K1 Nanofiltration
K1 Nanofiltración
K1 Ceramic membranes
K1 Membranas cerámicas
AB 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).
PB Elsevier
SN 1387-1811
YR 2020
FD 2020
LK https://uvadoc.uva.es/handle/10324/48939
UL https://uvadoc.uva.es/handle/10324/48939
LA eng
NO Microporous and Mesoporous Materials, 2020, vol. 303, 110289
NO Producción Científica
DS UVaDOC
RD 22-dic-2024