Entropy driven phase transitions in colloid polymer suspensions : Tests of depletion theories

Thumbnail Image
Date
2002
Authors
Ramakrishnan, S.
Schweizer, Kenneth S.
Zukoski, Charles F.
Editors
Contact
Journal ISSN
Electronic ISSN
ISBN
Bibliographical data
Publisher
Series
DOI (citable link)
ArXiv-ID
International patent number
EU project number
Project
Open Access publication
Collections
Restricted until
Title in another language
Research Projects
Organizational Units
Journal Issue
Publication type
Journal article
Publication status
Published in
Journal of Chemical Physics ; 116 (2002). - pp. 2201-2212
Abstract
The phase behavior of model athermal silica ~radius R550 nm! polystyrene toluene suspensions has been determined over nearly two orders of magnitude in polymer or colloid size asymmetry. Fluid gel, fluid crystal, and fluid fluid transitions are observed as Rg , the polymer radius of gyration, increases. Based on the polymer concentration relative to the dilute semidilute crossover density, cp /cp * , as the relevant measure of depletion attraction, we find that suspension miscibility monotonically improves as Rg increases for all colloid volume fractions. This trend is in contradiction to all classic depletion theories of which we are aware. However, the predictions of fluid fluid spinodal phase separation by the microscopic polymer reference interaction site model integral equation theory of athermal polymer colloid suspensions are in agreement with the experimental observations. Polymer polymer interactions, chain fractal structure, and structural reorganizations are implicated as critical physical factors. A fluid gel transition is observed in the one-phase region for Rg50.026R. The recently proposed dynamic mode-coupling theory is found to provide a nearly quantitative prediction of the gel line. With increasing Rg /R, gelation is predicted to require larger values of cp /cp * such that the nonergodicity transition shifts into the metastable region of the phase diagram in agreement with experiment. Comparison of the gelation behavior predicted based on the assumption that it is coincident with the static percolation line is also examined, with mixed results.
Summary in another language
Subject (DDC)
530 Physics
Keywords
Conference
Review
undefined / . - undefined, undefined. - (undefined; undefined)
Cite This
ISO 690RAMAKRISHNAN, S., Matthias FUCHS, Kenneth S. SCHWEIZER, Charles F. ZUKOSKI, 2002. Entropy driven phase transitions in colloid polymer suspensions : Tests of depletion theories. In: Journal of Chemical Physics. 116, pp. 2201-2212. Available under: doi: 10.1063/1.1426413
BibTex
@article{Ramakrishnan2002Entro-9399,
  year={2002},
  doi={10.1063/1.1426413},
  title={Entropy driven phase transitions in colloid polymer suspensions : Tests of depletion theories},
  volume={116},
  journal={Journal of Chemical Physics},
  pages={2201--2212},
  author={Ramakrishnan, S. and Fuchs, Matthias and Schweizer, Kenneth S. and Zukoski, Charles F.}
}
RDF
<rdf:RDF
    xmlns:dcterms="http://purl.org/dc/terms/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:bibo="http://purl.org/ontology/bibo/"
    xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#"
    xmlns:foaf="http://xmlns.com/foaf/0.1/"
    xmlns:void="http://rdfs.org/ns/void#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > 
  <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/9399">
    <dcterms:issued>2002</dcterms:issued>
    <dcterms:rights rdf:resource="http://creativecommons.org/licenses/by-nc-nd/2.0/"/>
    <dcterms:bibliographicCitation>First publ. in: Journal of Chemical Physics 116 (2002), pp. 2201-2212</dcterms:bibliographicCitation>
    <dc:creator>Zukoski, Charles F.</dc:creator>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:56:11Z</dc:date>
    <dc:contributor>Zukoski, Charles F.</dc:contributor>
    <dc:language>eng</dc:language>
    <dc:creator>Ramakrishnan, S.</dc:creator>
    <dc:format>application/pdf</dc:format>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/9399/1/Entropy_JChemPhys_116_2201.pdf"/>
    <dc:creator>Schweizer, Kenneth S.</dc:creator>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/9399/1/Entropy_JChemPhys_116_2201.pdf"/>
    <dc:contributor>Fuchs, Matthias</dc:contributor>
    <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/9399"/>
    <dc:rights>Attribution-NonCommercial-NoDerivs 2.0 Generic</dc:rights>
    <dcterms:abstract xml:lang="deu">The phase behavior of model athermal silica ~radius R550 nm! polystyrene toluene suspensions has been determined over nearly two orders of magnitude in polymer or colloid size asymmetry. Fluid gel, fluid crystal, and fluid fluid transitions are observed as Rg , the polymer radius of gyration, increases. Based on the polymer concentration relative to the dilute semidilute crossover density, cp /cp * , as the relevant measure of depletion attraction, we find that suspension miscibility monotonically improves as Rg increases for all colloid volume fractions. This trend is in contradiction to all classic depletion theories of which we are aware. However, the predictions of fluid fluid spinodal phase separation by the microscopic polymer reference interaction site model integral equation theory of athermal polymer colloid suspensions are in agreement with the experimental observations. Polymer polymer interactions, chain fractal structure, and structural reorganizations are implicated as critical physical factors. A fluid gel transition is observed in the one-phase region for Rg50.026R. The recently proposed dynamic mode-coupling theory is found to provide a nearly quantitative prediction of the gel line. With increasing Rg /R, gelation is predicted to require larger values of cp /cp * such that the nonergodicity transition shifts into the metastable region of the phase diagram in agreement with experiment. Comparison of the gelation behavior predicted based on the assumption that it is coincident with the static percolation line is also examined, with mixed results.</dcterms:abstract>
    <dc:contributor>Ramakrishnan, S.</dc:contributor>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dcterms:title>Entropy driven phase transitions in colloid polymer suspensions : Tests of depletion theories</dcterms:title>
    <dc:creator>Fuchs, Matthias</dc:creator>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:56:11Z</dcterms:available>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dc:contributor>Schweizer, Kenneth S.</dc:contributor>
  </rdf:Description>
</rdf:RDF>
Internal note
xmlui.Submission.submit.DescribeStep.inputForms.label.kops_note_fromSubmitter
Contact
URL of original publication
Test date of URL
Examination date of dissertation
Method of financing
Comment on publication
Alliance license
Corresponding Authors der Uni Konstanz vorhanden
International Co-Authors
Bibliography of Konstanz
No
Refereed