Document Detail


Colloidal permeability of liquid membranes consisting of hard particles by nonequilibrium simulations.
MedLine Citation:
PMID:  19894974     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A novel particulate membrane, comprised of a confined fluid of colloidal hard spheres, is presented and studied by means of simulations. Using a fluid of smaller hard spheres as feed, the transport properties of the membrane are studied as a function of the volume fractions of both the feed solution and membrane and the size ratio between both types of particles. Our simulations show that the fluid in the membrane is compressed to the permeate side due to the pressure of the feed. This effect controls the permeability behavior of the membrane: impermeable when the feed pressure is too low, or when the pressure is high enough to induce crystallization of the membrane fluid. Thus, the permeability first increases and then decreases, upon increasing the feed concentration. Finally we focus in systems with high concentrations of the feed and membrane fluids, where completely impermeable membranes are obtained only when the feed spheres are big enough (sigma(f)>0.38sigma(m)).
Authors:
Mar??a J Ariza; Antonio M Puertas
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of chemical physics     Volume:  131     ISSN:  1089-7690     ISO Abbreviation:  J Chem Phys     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-11-09     Completed Date:  2010-01-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375360     Medline TA:  J Chem Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  164903     Citation Subset:  IM    
Affiliation:
Department of Applied Physics, Group of Complex Fluids Physics, University of Almeria, 04120 Almeria, Andaluc??a, Spain.
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MeSH Terms
Descriptor/Qualifier:
Colloids
Membranes, Artificial*
Models, Chemical*
Models, Molecular
Molecular Conformation
Particle Size
Permeability
Time Factors
Chemical
Reg. No./Substance:
0/Colloids; 0/Membranes, Artificial

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