Clustering of binary colloidal suspensions: Experiment

Mehrdad Yasrebi, Wan Y. Shih, Ilhan A. Aksay

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The stability of binary colloidal suspensions is examined and compared to that of particle-polymer systems. In particle-polymer systems, it is known that the addition of free polymers within a concentration range of polymers to a stabilized dispersion leads to flocculation. Similar to particle-polymer systems, we have observed that in binary colloidal suspensions, particles of the first kind can be induced to flocculate by the presence of particles of the second kind, within a certain range of concentration of the second kind of particles. Moreover, we have observed the growth of clusters of particles 1 at a later time in the initially restabilized regime. This slow growth of clusters in the initially restabilized suspensions is associated with the slowing of particle movement due to higher particle 2 concentrations. The aging phenomenon (growth of clusters) that occurs at high particle 2 concentrations clearly indicates that the seemingly restabilized suspension at high particle 2 concentrations is not due to thermodynamics, but to slow kinetics associated with slow particle movements at high densities. A similar aging phenomenon was observed with a particle-polymer (α-Al2O3/PAA) system in the seeming restabilization regime at high polymer concentrations.

Original languageEnglish (US)
Pages (from-to)357-368
Number of pages12
JournalJournal of Colloid And Interface Science
Issue number2
StatePublished - Mar 15 1991

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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