Kinetics of gel formation in dilute dispersions with strong attractive particle interactions

Peter Sandkuhler, J. Sefcik, M. Morbidelli

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

We report a combined experimental and modeling study to investigate the kinetics of the transformation of a colloidal dispersion with strong attractive particle interactions into a gel. In the model, a two step mechanism is proposed, where an initial aggregation step is followed by an interconnection step leading to a particle network spanning the entire system volume. Using the Smoluchowski aggregation equation for the first step, we introduce a criterion to determine when the aggregation process is arrested and clusters become caged. In the second step the caged clusters diffuse over short distances and interconnect to form the particle network. The reliability of the gelation times computed by the model has been tested by comparison with a suitable set of experimental data. In addition, we show that the concept of mathematical gelation within the Smoluchowski aggregation equation is not appropriate for the description of the entire gel formation process in this system.
LanguageEnglish
Pages133-143
Number of pages10
JournalAdvances in Colloid and Interface Science
Volume108
DOIs
Publication statusPublished - 2004

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Particle interactions
particle interactions
Dispersions
Gels
Agglomeration
gels
Kinetics
kinetics
Gelation
gelation

Keywords

  • colloidal dispersions
  • aggregation kinetics
  • gelation
  • light scattering

Cite this

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Kinetics of gel formation in dilute dispersions with strong attractive particle interactions. / Sandkuhler, Peter; Sefcik, J.; Morbidelli, M.

In: Advances in Colloid and Interface Science, Vol. 108, 2004, p. 133-143.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Kinetics of gel formation in dilute dispersions with strong attractive particle interactions

AU - Sandkuhler, Peter

AU - Sefcik, J.

AU - Morbidelli, M.

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AB - We report a combined experimental and modeling study to investigate the kinetics of the transformation of a colloidal dispersion with strong attractive particle interactions into a gel. In the model, a two step mechanism is proposed, where an initial aggregation step is followed by an interconnection step leading to a particle network spanning the entire system volume. Using the Smoluchowski aggregation equation for the first step, we introduce a criterion to determine when the aggregation process is arrested and clusters become caged. In the second step the caged clusters diffuse over short distances and interconnect to form the particle network. The reliability of the gelation times computed by the model has been tested by comparison with a suitable set of experimental data. In addition, we show that the concept of mathematical gelation within the Smoluchowski aggregation equation is not appropriate for the description of the entire gel formation process in this system.

KW - colloidal dispersions

KW - aggregation kinetics

KW - gelation

KW - light scattering

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