Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 126, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2711179
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The heat capacity, C-p, and enthalpy and entropy change of alpha-cyclodextrin, H2O, and 4-methylpyridine solutions have been studied during their freezing on heating, isothermal freezing, and the solid's melting on cooling. Freezing occurs in several endothermic steps on heating to 383 K and alpha-cyclodextrin rich solutions freeze in four steps. The melting rate becomes slower with decrease in temperature and its steps merge. Decreasing the amount of alpha-cyclodextrin decreases the C-p change on freezing. The endothermic freezing phenomenon differs from freezing of a pure liquid and is attributed to formation of a solid inclusion compound and its incongruent way of exothermic melting. (c) 2007 American Institute of Physics.
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