Abstract
The Dutch Society for Thermal Analysis has developed tests to measure the resolution and the sensitivity of Differential Scanning Calorimeters. For this test the substance 4,4′-azoxyanisole is used. This substance shows two transitions: a solid to liquid crystal transition at about 117°C (ΔH≈120 J g−1) and a liquid crystal to isotropic liquid transition at about 134°C (ΔH≈2 J g−1). The resolution test is performed using an amount of 5 mg substance and a high heating rate of 20°C min−1. The resolution is evaluated by measuring how well the two peaks are separated. An amount of 0.25 mg substance and a low heating rate of 0.1 °C min−1 is used for the sensitivity test. The sensitivity is evaluated as the ratio of the peak height of the LC-transition and the top-top noise level.
Members of the TAWN were asked to participate in the test. Each participant was provided with an amount of sample and a test procedure. 47 Contributions were received and these results are presented.
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All members of the TAWN who participated in the tests are thanked for their contributions.
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van Ekeren, P.J., Holl, C.M. & Witteveen, A.J. A comparative test of differential scanning calorimeters. Journal of Thermal Analysis 49, 1105–1114 (1997). https://doi.org/10.1007/BF01996799
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DOI: https://doi.org/10.1007/BF01996799