Summary Using an ethylene glycol mono‐ethyl ether (EGME) retention method, full unimolecular layer coverage of Ca‐montmorillonite surfaces was established in 2 hours in an evacuated system (0.5 mm Hg) containing a free liquid surface of EGME and dry CaCl 2 , as a separate phase. EGME retention in the presence of CaCl 2 ‐EGME solvate led to incomplete unimolecular layer coverage, the EGME retention being governed by exchangeable Ca‐EGME interaction and not by the real extent of the clay surface. Unlike montmorillonite which has the two layers of EGME molecules between adjacent alumino‐silicate sheets, a vermiculite intercalated only one layer of EGME in the interlamellar space. Relevant X‐ray and differential thermal microanalysis data are provided.
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Eltantawy et al. (1973) studied this question.
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