Nature of flocculation and tactoid formation in montmorillonite: the role of pH.

M Segad, Torbjörn Åkesson, B Cabane, Bo Jönsson

Research output: Contribution to journalArticlepeer-review


The dissolution and swelling properties of montmorillonite at different pH have been studied, using small angle X-ray scattering (SAXS), imaging and osmotic stress methods combined with Monte Carlo simulations. The acidity of montmorillonite dispersions has been varied as well as the counterions to the net negatively charged platelets. At low pH, Na montmorillonite dissolves and among other species Al(3+) is released, hydrated, polymerized and then it replaces the counterions in the clay. This dramatically changes the microstructure of Na montmorillonite, which instead of having fully exfoliated platelets, turns into a structure of aggregated platelets, so-called tactoids. Montmorillonite dispersion still has a significant extra-lamellar swelling among the tactoids due to the presence of very small nanoplatelets.
Original languageEnglish
Pages (from-to)29608-29615
JournalPhysical Chemistry Chemical Physics
Issue number44
Publication statusPublished - 2015

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Theoretical Chemistry (S) (011001039)

Subject classification (UKÄ)

  • Physical Chemistry


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