Abstract
During recent investigations of the effects of crystallite size on properties of three-layer clay minerals a series of size fractions of a montmoril-lonite was obtained. With the natural exchange cations, the 2-4 μ fraction of the clay expanded when solvated with ethylene glycol. After exchanging the natural interlayer cations for either Na+ or K+ or Ca2+ a portion of the fraction collapsed to a 10 Å d-spacing even when soaked with ethylene glycol. In spite of the fact that these interlayer cations established a strong enough bond between the silicate layers to resist expansion the cations were exchangeable under mild laboratory methods of exchange.
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