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Gels pp 126-130 | Cite as

An experimental approach to the determination of two-dimensional gel-point: A film balance study

  • Z. Hórvölgyi
  • M. Máté
  • M. Zrínyi
  • J. H. Fendler
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 102)

Abstract

Two-dimensional gelation has been modelled by the lateral compression of microparticles at water(aqueous solution)-air interfaces in a film balance. The compression induced network formation manifested itself in increased surface pressure (II) at significantly higher surface areas (A) than those observed in hexagonally close-packed particle ordering. The gel-point of a system in these experiments is definec as a surface area (or rather suface coverage) at which the particle-aggregates reach their “solid state”. It can be determined by fitting a tangent to the “solid-state-part” of II-A isotherm and extrapolating it to II=0.

The threshold of gelation was studied from the point of view of particle-particle interactions. The colloid and capillary interactions were influenced by the hydrophobicity of the particles and the composition of liquid phase. Computer simulations of the two-dimensional gelation were also investigated. Both the experimental and numerical results indicate decreasing gel-point (given in surface coverage) with increasing adhesion between the particles. This is in full accord with the well-known particle-particle achesion to the specific volume of sediments (in three dimensions) relationship.

Kew words

Interfacial gelation surface pressure hydrophobicity film balance computer simulation 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1996

Authors and Affiliations

  • Z. Hórvölgyi
    • 1
  • M. Máté
    • 1
  • M. Zrínyi
    • 1
  • J. H. Fendler
    • 2
  1. 1.Department of Physical ChemistryTechnical University of BudapestBudapestHungary
  2. 2.Department of ChemistrySyracuse UniversitySyracuseUSA

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