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Low‐Temperature Phases of Interfacial Water in Clay‐Water Systems
Author(s) -
Anderson Duwayne M.,
Tice Allen R.
Publication year - 1971
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/sssaj1971.03615995003500010019x
Subject(s) - clay minerals , phase (matter) , atmospheric temperature range , mineralogy , thermal , phase change , differential thermal analysis , thermodynamics , chemistry , materials science , physics , organic chemistry , diffraction , optics
Low temperature differential thermal analyses of selected clay‐water systems were made to locate important phase change temperatures and to define fruitful temperature‐pressure fields for precise calorimetric investigation. In addition to an exotherm corresponding to initial freezing, one, two or three exotherms were observed between −35C and −60C. The low temperature exotherms do not depend critically upon water content, but clearly they are related to clay mineral and exchangeable cation type. The evolution of heat in this temperature range probably corresponds to a phase change in the interfacial water.