Premium
Particle Shape and Size of Two Sodium Calcium Montmorillonite Clays
Author(s) -
Dufey Joseph E.,
Banin Amos
Publication year - 1979
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1979.03615995004300040033x
Subject(s) - montmorillonite , viscosity , mineralogy , condensation , phase (matter) , clay minerals , particle (ecology) , sodium , particle size , materials science , chemistry , geology , composite material , thermodynamics , metallurgy , organic chemistry , physics , oceanography
Viscosity measurements of Na‐Ca montmorillonite suspensions (Wyoming and Camp‐Berteau) were performed at five temperatures (11 to 35°C). At a given composition of the surface phase, discontinuous variations of intrinsic viscosity were observed with changing temperature. According to similar observations from the literature, variations would be due to structural modifications of water layers surrounding the clay particles. By combining those results with optical density spectra, we have pointed out different characteristics for the Wyoming and Camp‐Berteau clays. The single plates of Camp‐Berteau montmorillonite are smaller than those of Wyoming. At high Ca‐loading, the formation of thicker particles by parallel condensation of single plates does not involve any marked increase of average major axis in the case of the Wyoming clay. On the other hand, the Camp‐Berteau plates are likely to overlap when they condense; that results in an increasing major axis with increasing Ca‐loading, leading to similar shapes for both pure Ca‐clays. Those results were confirmed by measurements of water content in clay sediments.