Gelation in model colloid-polymer mixtures

Bergenholtz, Johan; Poon, Wilson C. K.; Fuchs, Matthias

Gelation in model colloid-polymer mixtures

Files

Gelation_in_model_colloid_polymer_mixtures.pdf(210.51 KB)

Date

2003

Authors

Bergenholtz, Johan

Poon, Wilson C. K.

Fuchs, Matthias

Publication type

Journal article

Published in

Langmuir ; 19 (2003), 10. - pp. 4493-4503

Abstract

Mode coupling theory (MCT) is used to model gel formation in mixtures of colloidal particles and nonadsorbing polymer. The polymer induces an effective, short-range attraction among the colloids, which is modeled by a depletion attraction of the Asakura-Oosawa form. This enables the MCT to be solved analytically for dilute systems, leading to a prediction, free of adjustable parameters, of the location of the gel boundary in the phase diagram. For concentrated systems, a simple mapping is suggested that makes a previous theory for Yukawa interactions applicable to colloid-polymer mixtures. The results are compared against Monte Carlo simulations and experiments on model systems. Excellent agreement is observed at high colloid concentrations, where the theory predicts melting of glassy structures on addition of small amounts of polymer. Further addition of polymer causes gelation, in semiquantitative accord with experimental data at moderate to high colloid concentrations. However, at lower concentrations the theory is unable to capture the onset of transient gelation.

Subject (DDC)

530 Physics

Cite This

ISO 690

BERGENHOLTZ, Johan, Wilson C. K. POON, Matthias FUCHS, 2003. Gelation in model colloid-polymer mixtures. In: Langmuir. 19(10), pp. 4493-4503. Available under: doi: 10.1021/la0340089

BibTex

@article{Bergenholtz2003Gelat-4883,
  year={2003},
  doi={10.1021/la0340089},
  title={Gelation in model colloid-polymer mixtures},
  number={10},
  volume={19},
  journal={Langmuir},
  pages={4493--4503},
  author={Bergenholtz, Johan and Poon, Wilson C. K. and Fuchs, Matthias}
}

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/123456789/4883">
    <dcterms:issued>2003</dcterms:issued>
    <dcterms:rights rdf:resource="http://creativecommons.org/licenses/by-nc-nd/2.0/"/>
    <dc:creator>Poon, Wilson C. K.</dc:creator>
    <dcterms:abstract xml:lang="eng">Mode coupling theory (MCT) is used to model gel formation in mixtures of colloidal particles and nonadsorbing polymer. The polymer induces an effective, short-range attraction among the colloids, which is modeled by a depletion attraction of the Asakura-Oosawa form. This enables the MCT to be solved analytically for dilute systems, leading to a prediction, free of adjustable parameters, of the location of the gel boundary in the phase diagram. For concentrated systems, a simple mapping is suggested that makes a previous theory for Yukawa interactions applicable to colloid-polymer mixtures. The results are compared against Monte Carlo simulations and experiments on model systems. Excellent agreement is observed at high colloid concentrations, where the theory predicts melting of glassy structures on addition of small amounts of polymer. Further addition of polymer causes gelation, in semiquantitative accord with experimental data at moderate to high colloid concentrations. However, at lower concentrations the theory is unable to capture the onset of transient gelation.</dcterms:abstract>
    <dc:creator>Bergenholtz, Johan</dc:creator>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T14:51:04Z</dc:date>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dcterms:title>Gelation in model colloid-polymer mixtures</dcterms:title>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/4883/1/Gelation_in_model_colloid_polymer_mixtures.pdf"/>
    <dc:contributor>Poon, Wilson C. K.</dc:contributor>
    <dc:language>eng</dc:language>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/4883/1/Gelation_in_model_colloid_polymer_mixtures.pdf"/>
    <dc:creator>Fuchs, Matthias</dc:creator>
    <dc:contributor>Fuchs, Matthias</dc:contributor>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dc:contributor>Bergenholtz, Johan</dc:contributor>
    <dc:rights>Attribution-NonCommercial-NoDerivs 2.0 Generic</dc:rights>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T14:51:04Z</dcterms:available>
    <dc:format>application/pdf</dc:format>
    <dcterms:bibliographicCitation>First publ. in: Langmuir 19 (2003), 10, pp. 4493-4503</dcterms:bibliographicCitation>
    <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/4883"/>
  </rdf:Description>
</rdf:RDF>

Bibliography of Konstanz

No