This paper presents a thermal analysis device, which can measure thermal conductivity of picoliter scale liquid sample. We employ the three omega method with a microfabricated AC thermal sensor with nanometer width heater. The liquid sample is confined by a micro-well structure fabricated on the sensor surface. The performance of the instrument was verified by measuring the thermal conductivity of 27-picoliter samples of de-ionized (DI) water, ethanol, methanol, and DI water-ethanol mixtures with accuracies better than 3%. Furthermore, another analytical scheme allows real-time thermal conductivity measurement with 5% accuracy. To the best of our knowledge, this technique requires the smallest volume of sample to measure thermal property ever.
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October 2012
Brief Report|
October 03 2012
Note: Development of a microfabricated sensor to measure thermal conductivity of picoliter scale liquid samples
Byoung Kyoo Park;
Byoung Kyoo Park
1
Department of Mechanical Engineering
, POSTECH, Pohang 790-784, South Korea
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Namwoo Yi;
Namwoo Yi
1
Department of Mechanical Engineering
, POSTECH, Pohang 790-784, South Korea
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Jaesung Park;
Jaesung Park
2
School of Interdisciplinary Bioscience and Bioengineering
, POSTECH, Pohang 790-784, South Korea
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Dongsik Kim
Dongsik Kim
a)
1
Department of Mechanical Engineering
, POSTECH, Pohang 790-784, South Korea
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a)
Author to whom correspondence should be addressed. Electronic mail: dskim87@postech.ac.kr.
Rev. Sci. Instrum. 83, 106102 (2012)
Article history
Received:
July 16 2012
Accepted:
September 19 2012
Citation
Byoung Kyoo Park, Namwoo Yi, Jaesung Park, Dongsik Kim; Note: Development of a microfabricated sensor to measure thermal conductivity of picoliter scale liquid samples. Rev. Sci. Instrum. 1 October 2012; 83 (10): 106102. https://doi.org/10.1063/1.4757400
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