Linked Life Data

21419414

Source:http://linkedlifedata.com/resource/pubmed/id/21419414

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2011-4-11
pubmed:abstractText
We consider the interaction of colloidal spheres in the presence of mono-, di-, and trivalent ions. The colloids are stabilized by electrostatic repulsion due to surface charges. The repulsive part of the interaction potential ?(d) is deduced from precise measurements of the rate of slow coagulation. These "microsurface potential measurements" allow us to determine a weak repulsion in which ?(d) is of the order of a few k(B)T. These data are compared to ? potential measured under similar conditions. At higher concentrations both di- and trivalent counterions accumulate at the very proximity of the particle surface leading to charge reversal. The salt concentration c(cr) at which charge reversal occurs is found to be always above the critical coagulation concentration c(ccc). The analysis of ?(d) and of the ? potential demonstrates, however, that adsorption of multivalent counterions starts far below c(cr). Hence, colloid stability in the presence of di- and trivalent ions cannot be described in terms of a DLVO ansatz assuming a surface charge that is constant with regard to the ionic strength.
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Jun
pubmed:issn
1095-7103
pubmed:author
pubmed:copyrightInfo
Copyright © 2011 Elsevier Inc. All rights reserved.
pubmed:issnType
Electronic
pubmed:day
1
pubmed:volume
358
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
62-7
pubmed:year
2011
pubmed:articleTitle
Experimental study of electrostatically stabilized colloidal particles: colloidal stability and charge reversal.
pubmed:affiliation
F-I2 Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin, Berlin, Germany. christian.schneider@helmholtz-berlin.de
pubmed:publicationType
Journal Article