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@ARTICLE{Roa:829413,
author = {Roa, Rafael and Menne, Daniel and Riest, Jonas and Buzatu,
Pompilia and Zholkovskiy, Emiliy K. and Dhont, Jan K. G. and
Wessling, Matthias and Naegele, Gerhard},
title = {{U}ltrafiltration of charge-stabilized dispersions at low
salinity},
journal = {Soft matter},
volume = {12},
number = {20},
issn = {1744-6848},
address = {London},
publisher = {Royal Soc. of Chemistry},
reportid = {FZJ-2017-03117},
pages = {4638 - 4653},
year = {2016},
abstract = {We present a comprehensive study of cross-flow
ultrafiltration (UF) of charge-stabilized suspensions, under
low-salinity conditions of electrostatically strongly
repelling colloidal particles. The axially varying permeate
flux, near-membrane concentration-polarization (CP) layer
and osmotic pressure profiles are calculated using a
macroscopic diffusion-advection boundary layer method, and
are compared with filtration experiments on aqueous
suspensions of charge-stabilized silica particles. The
theoretical description based on the one-component macroion
fluid model (OCM) accounts for the strong influence of
surface-released counterions on the renormalized colloid
charge and suspension osmotic compressibility, and for the
influence of the colloidal hydrodynamic interactions and
electric double layer repulsion on the
concentration-dependent suspension viscosity η, and
collective diffusion coefficient Dc. A strong
electro-hydrodynamic enhancement of Dc and η, and likewise
of the osmotic pressure, is predicted theoretically, as
compared with their values for a hard-sphere suspension. We
also point to the failure of generalized Stokes–Einstein
relations describing reciprocal relations between Dc and η.
According to our filtration model, Dc is of dominant
influence, giving rise to an only weakly developed CP layer
having practically no effect on the permeate flux. This
prediction is quantitatively confirmed by our UF
measurements of the permeate flux using an aqueous
suspension of charged silica spheres as the feed system. The
experimentally detected fouling for the largest considered
transmembrane pressure values is shown not to be due to
filter cake formation by crystallization or vitrification.},
cin = {ICS-3},
ddc = {530},
cid = {I:(DE-Juel1)ICS-3-20110106},
pnm = {551 - Functional Macromolecules and Complexes (POF3-551)},
pid = {G:(DE-HGF)POF3-551},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000377123700018},
pubmed = {pmid:27113088},
doi = {10.1039/C6SM00660D},
url = {https://juser.fz-juelich.de/record/829413},
}