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Perkin-Elmer DSC-7 Differential Scanning Calorimeter
The Perkin-Elmer DSC-7 differential scanning calorimeter is used to accurately measure melting points, glass transitions, and heats of fusion. Typical temperature range is from 10 C to 400 C. The temperature scale is calibrated using a two-point calibration, measuring the onset temperatures of indium and zinc standards. The enthalpy scale is calibrated using the observed delta-H from an accurately known amount of indium.
Samples are encapsulated in disposable aluminum pans, typically using 3 – 10 milligrams of sample. There are two styles of pan available, one used for solids, and a hermetically sealed version for liquids. Great care must be taken not to overheat samples in the DSC so that they will not leak out of or burst the sample pans. Material that leaks out into the DSC can cause permanent damage to the DSC’s furnace, particularly if there are metals present in the sample that could alloy with the platinum furnace holders. There is a sample side and a reference side to the furnace. A blank pan is usually inserted into the reference side.
Data acquisition and processing is done with Perkin-Elmer’s Pyris software. From graphs of heat flow versus temperature, one can calculate onset temperatures, peak areas, enthalpies, and glass transitions.
Persons needing to use the DSC should contact Jim Windak for training, jwindak@umich.edu.
The TGA-DSC User's Booklet should be printed out and read prior to the training session.
You will need to provide a valid shortcode account number for billing your access time on the instrument. Current rates are $9 per hour for UM shortcode accounts, and $65 per hour for non-UM accounts.
The Perkin-Elmer DSC-7 is located in room 2069 Chemistry.
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