Open AccessSurface and interfacial tensions of aqueous dispersions of charged colloidal (clay) particles
Author(s) -
Laurier L. Schramm,
Loren G. Hepler
Publication year - 1994
Publication title -
canadian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.323
H-Index - 68
eISSN - 1480-3291
pISSN - 0008-4042
DOI - 10.1139/v94-243
Subject(s) - montmorillonite , suspension (topology) , surface tension , chemistry , aqueous solution , kaolinite , toluene , colloid , bubble , chemical engineering , aqueous suspension , mineralogy , thermodynamics , organic chemistry , physics , mathematics , homotopy , parallel computing , computer science , pure mathematics , engineering
We have measured (du Nouy ring and maximum bubble pressure methods) suspension–air surface tensions of aqueous suspensions of montmorillonite and have observed that these surface tensions are larger than those of pure water at the same temperatures. Further measurements have shown that dispersed montmorillonite also increases the suspension–toluene interfacial tension compared with that of pure water–toluene. Similar measurements on aqueous suspensions of kaolinite have yielded suspension–air interfacial tensions with uncertainties as large as the observed (small) effect, and also shown that the suspension–toluene interfacial tension is decreased (opposite to the effect of montmorillonite) by amounts larger than the experimental uncertainties. Measurements of maximum bubble pressures at different flow rates have provided information about the effect of surface age on observed surface tensions.