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Decreased osmotic pressure via interfacial charge clustering.
MedLine Citation:
PMID:  20684628     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Behaviors of a model interfacial system featuring the clustering of discrete, mobile wall charges and a counterion solution are investigated. The results demonstrate that even very small localized charge clusters produce significant effects for the osmotic pressure, effects that are not adequately represented in common colloidal models. We observe a pronounced decrease in osmotic pressure where a certain level of clustering is attained, with potentially significant implications for theories of colloidal stability and biochemical processes at microscopic length scales. The stable level of wall charge clustering, and thus the osmotic pressure, is found to be variable in the addition of an attractive potential, as measured via the excess free energy of clustering.
Authors:
John M A Grime; Malek O Khan
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  114     ISSN:  1520-5207     ISO Abbreviation:  J Phys Chem B     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-05     Completed Date:  2010-11-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  United States    
Other Details:
Languages:  eng     Pagination:  10049-56     Citation Subset:  -    
Affiliation:
Department of Physical and Analytical Chemistry, Physical Chemistry, Uppsala University, Uppsala, Sweden. john.grime@fki.uu.se
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