Phase diagram of a solution undergoing inverse melting.
The phase diagram of alpha -cyclodextrin/water/4-methylpyridine solutions, a system undergoing inverse melting, has been studied by differential scanning calorimetry, rheological methods, and x-ray diffraction. Two different fluid phases separated by a solid region have been observed in the high alpha -cyclodextrin concentration range (c > or =150 mg/ml) . Decreasing c , the temperature interval where the solid phase exists decreases and eventually disappears, and a first-order phase transition is observed between the two different fluid phases.
Research Center SOFT INFM-CNR, Università di Roma La Sapienza I-00185, Roma, Italy.
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Angelini
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Ruocco
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De Panfilis