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- W2249229462 abstract "THE EFFECTS OF DEHYDRATION BY EVACUATION AND HEATING TO PROGRESSIVELY HIGHER TEMPERATURES UP TO 400 C ON THE SUBSEQUENT HYDRATION AND SWELLING BEHAVIOR OF HOMOIONIC PREDOMINATELY ILLITE CLAY MINERALS HAS BEEN STUDIED. WATER VAPOR SORPTION ISOTHERMS FOR 200-MG TABLETS AT 25 C WERE DETERMINED USING A VOLUMETRIC DOSER TECHNIQUE, AND SWELLING OF THE CLAYS AT LOW WATER SUCTIONS WAS MEASURED ON CERAMIC SUCTION PLATES. THE SWELLING OF CERTAIN ILLITIC CLAYS IS SUBJECT TO A MARKED REDUCTION (E.G., FROM 200 PERCENT TO 35 PERCENT WATER CONTENT AT 10 MILLIBARS SUCTION) AFTER PREHEATING, INDICATING THE FORMATION OF VERY STRONG BINDING FORCES BETWEEN INDIVIDUAL CLAY PARTICLES. ALTHOUGH WATER VAPOR SORPTION AT LOW RELATIVE VAPOR PRESSURES SHOWS THAT PART OF THE WATER LOSS ON HEATING IS IRREVERSIBLE, IT SEEMS UNLIKELY THAT ANY DETERIORATION OF THE CRYSTAL LATTICE HAS OCCURRED AT THE TEMPERATURES USED. THE CATION EXCHANGE CAPACITIES OF THE CLAYS ARE UNALTERED, AND THE SPECIFIC SURFACE AREAS ARE ESSENTIALLY THE SAME AFTER HEATING. THE NATURE OF THE BONDING MECHANISM IS NOT YET CLEAR, BUT THERE IS EVIDENCE THAT SMALL AMOUNTS OF KAOLINITE IMPURITIES PRESENT MAY BE INVOLVED. IT SEEMS LIKELY THAT THE FORMATION OF HYDROGEN BONDS BETWEEN SILICATE AND ALUMINATE SURFACES CAN OCCUR ON COMPLETE REMOVAL OF THE ABSORBED WATER MOLECULES. /AUTHOR/" @default.
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- W2249229462 date "1969-01-01" @default.
- W2249229462 modified "2023-09-22" @default.
- W2249229462 title "EFFECTS OF HEATING ON THE SWELLING OF CLAY MINERALS" @default.
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