Document Detail


Clouding: origin of phase separation in oppositely charged polyelectrolyte/surfactant mixed solutions.
MedLine Citation:
PMID:  16471766     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The phase behavior in the system of cationic modified poly(vinyl alcohol) (CPVA)-sodium dodecylsulfate (SDS)-water has been investigated. Samples were found phase separated near electroneutral mixing at CPVA concentrations < or =6%, while in a medium CPVA concentration of 7-12%, the phase separation disappeared and the system transformed into bluish homogeneous solution. At > or =13% CPVA concentrations, the mixed systems became colorless homogeneous. Preclouding phenomenon was observed in 5-8% CPVA-SDS mixed systems at an electroneutral mixing ratio. The addition of inorganic salts, such as Na2SO4, NaCl, NaBr, and NaSCN, could exclude the bluish and phase separation phenomenon that was found to be caused by the increase of clouding point in these systems. The clouding phenomenon was proven to be the origin of the phase separation in the CPVA-SDS mixed system. The ability for the inorganic salts to increase the clouding point follows the order of the Hofmeister series.
Authors:
Yun Yan; Li Li; Heinz Hoffmann
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  110     ISSN:  1520-6106     ISO Abbreviation:  J Phys Chem B     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-02-13     Completed Date:  2006-09-28     Revised Date:  2007-03-23    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1949-54     Citation Subset:  -    
Affiliation:
Bayreuther Zentrum für Kolloid und Grenzflächen, Universität Bayreuth, Gottlieb-keim Strasse 60, 95448, Germany. yun.yan@wur.nl
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