Compression Studies of Illite Suspensions
1955
Bolt, G. H. | Miller, R. D.
It can be shown that the classical Gouy-Chapman theory of the electric double layer formed on planar surfaces provides and acceptable means of predicting the “osmotic” pressure of clay suspensions for various particle spacings and electrolyte contents. A compression apparatus was designed for the measurement of the swelling pressures of clay suspensions over the range 0.1 to 100 atm. The results obtained with this apparatus for a number of illite samples are consistent with those predicted by theory. Consideration of the implications of these experiments for the mechanism of flocculation favors the following conclusions: (1) The attractive forces acting between clay particles in flocculated suspensions are probably a simple Coulombic attraction between negative and positive sites on the respective particles; (2) Van der Waal's forces are of no consequence in flocculation phenomena in the suspensions studied; (3) The energy of flocculation is small and cannot contribute significantly to the resistance of aggregates to mechanical breakdown.
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