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题名: A low-temperature automated adiabatic calorimeter - Heat capacities of high-purity graphite and polystyrene
作者: Tan, ZC;  Zhang, JB;  Meng, SH
关键词: adiabatic calorimeter ;  alpha-Al2O3 ;  graphite ;  heat capacity ;  polystyrene
刊名: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
发表日期: 1999
卷: 55, 期:1, 页:283-289
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical ;  Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: A computerized adiabatic calorimeter for heat capacity measurements in the temperature range 80-400 K has been constructed. The sample cell of the calorimeter, which is about 50 cm(3) in internal volume, is equipped with a platinum resistance thermometer and surrounded by an adiabatic shield and a guard shield. Two sets of 6-junction chromel-copel thermocouples are mounted between the cell and the shields to indicate the temperature differences between them. The adiabatic conditions of the cell are automatically controlled by two sets of temperature controller. The reliability of the calorimeter was verified through heat capacity measurements on the standard reference material alpha-Al2O3. The results agreed well with those of the National Bureau of Standards (NBS): within +/-0.2% throughout the whole temperature region. The heat capacities of high-purity graphite and polystyrene were precisely measured in the interval 260-370 K by using the above-mentioned calorimeter. The results were tabulated and plotted and the thermal behavior of the two materials was discussed in detail. Polynomial expressions for calculation of the heat capacities of the two substances are presented.
语种: 英语
WOS记录号: WOS:000079277500031
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138644
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China

Recommended Citation:
Tan, ZC,Zhang, JB,Meng, SH. A low-temperature automated adiabatic calorimeter - Heat capacities of high-purity graphite and polystyrene[J]. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY,1999,55(1):283-289.
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