A fully automated adiabatic calorimeter for heat capacity measurement between 80 and 400 K |
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| Authors: | Z -C Tan Q Shi B -P Liu H -T Zhang |
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| Institution: | (1) Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China;(2) Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China;(3) Department of Chemistry, Hunan University of Arts and Science, Changde, 415000, China |
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| Abstract: | A fully automated adiabatic calorimeter controlled on line by a computer used for heat capacity measurements in the temperature
range from 80 to 400 K was constructed. The hardware of the calorimetric system consisted of a Data Acquisition/Switch Unit,
34970A Agilent, a 7 1/2 Digit Nano Volt /Micro Ohm Meter, 34420A Agilent, and a P4 computer. The software was developed according
to modern controlling theory. The adiabatic calorimeter consisted mainly of a sample cell equipped with a miniature platinum
resistance thermometer and an electric heater, two (inner and outer) adiabatic shields, two sets of six junction differential
thermocouple piles and a high vacuum can. A Lake Shore 340 Temperature Controller and the two sets of differential thermocouples
were used to control the adiabatic conditions between the cell and its surroundings. The reliability of the calorimeter was
verified by measuring the heat capacities of synthetic sapphire (α-Al2O3), Standard Reference Material 720. The deviation of the data obtained by this calorimeter from those published by NIST was
within ±0.1% in the temperature range from 80 to 400 K. |
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| Keywords: | adiabatic calorimeter α -Al2O3 calorimetric automation heat capacity low temperature temperature controller |
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