Determination of cell asymmetry in temperature-modulated DSC

被引:30
作者
Boller, A
Okazaki, I
Ishikiriyama, K
Zhang, G
Wunderlich, B
机构
[1] UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996
[2] OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831
来源
JOURNAL OF THERMAL ANALYSIS | 1997年 / 49卷 / 02期
关键词
asymmetry correction; calibration; heat flux calorimeter; heat capacity; power compensated calorimeter; temperature modulated differential scanning calorimetry; TMDSC;
D O I
10.1007/BF01996796
中图分类号
O414.1 [热力学];
学科分类号
摘要
The quality of measurement of heat capacity by differential scanning calorimetry (DSC) is based on the symmetry of the twin calorimeters. This symmetry is of particular importance for the temperature-modulated DSC (TMDSC) since positive and negative deviations from symmetry cannot be distinguished in the most popular analysis methods. Three different DSC instruments capable of modulation have been calibrated for asymmetry using standard non-modulated measurements and a simple method is described that avoids potentially large errors when using the reversing heat capacity as the measured quantity. It consists of overcompensating the temperature-dependent asymmetry by increasing the mass of the sample pan.
引用
收藏
页码:1081 / 1088
页数:8
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