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Chemistry 75 Winter, 2010 Phase Transitions and Differential Scanning CalorimetryPage 1 Phase Transitions and Differential Scanning CalorimetryOverviewDifferential Scanning calorimetry (DSC) is an inexpensive and rapid method to measure heatcapacities of condensed phases . From these measuremenmst, enthalpy changes for phasetransitions can easily be determined. DSC has been applied to a wide variety of problems, fromcoal combustion to protein this experiment, we will begin with a standard reference substance, indium, and thenexamine several types of materials: an inorganic salt (NH4Cl), the polymer polyethylene, and twoliquid crystals: p-azoxyanisole, and cholesterylmyristate. Ammonium chloride has been studiedfor several years and is now considered to provide an excellent example of solid structural phasetransitions. It has two such Transitions , at 242 K and 457 K.
Chemistry 75 Winter, 2010 Phase Transitions and Differential Scanning Calorimetry Page 3 Melting Transitions In the first run, the melting of indium metal at 429 K will be observed and used as a
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