Flocculation of montmorillonite dispersions based on surfactant-polymer interactions

S. Magdassi*, Ben Zion Rodel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


A two-step flocculation process is described in which a polycation (polydiallyldimethylammonium chloride) is adsorbed on to negatively charged montmorillonite particles, followed by the addition of an anionic surfactant [sodium dodecyl sulfate (SDS)]. At a 1:1 molar ratio, optimal flocculation is obtained owing to the formation of an insoluble surfactant-polymer complex in the presence of the particles. The precipitation of the insoluble complex is also dependent on the SDS and polymer concentrations, and occurs at a 1:1 SDS:monomer molar ratio. From adsorption isotherms of the polymer-particle and surfactant-polymer systems, the adsorption energy was calculated and subsequently a flocculation mechanism is suggested.

Original languageAmerican English
Pages (from-to)51-56
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Issue number1
StatePublished - 2 Dec 1996


  • adsorption
  • flocculation
  • interaction
  • montmorillonite
  • polydiallylmethyla mmonium chloride
  • sodium dodecylsulphate


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