Differential 3ω calorimeter |
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| Authors: | D.H JungI.K Moon Y.H Jeong S.H Lee |
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| Affiliation: | a Department of Physics, Electron Spin Science Center, Pohang University of Science and Technology, Pohang 790-784, South Korea
b Temperature-Humidity Group, Korea Research Institute of Standards and Science, Daejon 305-600, South Korea |
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| Abstract: | We have developed a new dynamic calorimeter using the differential 3ω detection method. The differential 3ω calorimeter is capable of measuring dynamic heat capacity of liquid samples. The new calorimeter consists of a Wheatstone bridge made of two identical heater/sensors, and is based on the sensitive null detection method. The balancing is done automatically at all frequencies and is independent of temperature; once a sample is placed on one heater/sensor, a third harmonic signal is produced due to the difference in the two arms of the bridge. The differential 3ω calorimeter provides enhancements over traditional dynamic methods in dynamic range (up to 30 kHz), resolution, and ease of operation. |
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| Keywords: | 3ω calorimeter Differential method Dynamic heat capacity Glass transition |
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