Transcription of Phase Transitions and Differential Scanning …
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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.
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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