CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Laser-induced thermal lens study of the role of morphology and hydroxyl group in the evolution of thermal diffusivity of copper oxide |
Riya Sebastian, M S Swapna, Vimal Raj, and S Sankararaman† |
Department of Optoelectronics, University of Kerala, Trivandrum 695581, Kerala, India |
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Abstract The paper explores the evolution of thermal behavior of the material by studying the variations in thermal diffusivity using the single beam thermal lens (TL) technique. For this purpose, the decomposition of Cu(OH)2 into CuO is studied in a time range up to 120 h, by subjecting the sample to morphological, structural, and spectroscopic characterizations. The time evolution of thermal diffusivity can be divided into three regions for demonstrating the dynamics of the reaction. When the reaction is complete, the thermal diffusivity is also found to be saturated. In addition to the morphological modifications, from rods to flakes, the variations in the amount of hydroxyl group are attributed to be responsible for the enhancement of base fluid's thermal diffusivity by 165%. Thus the study unveils the role of hydroxyl groups in the thermal behavior of CuO.
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Received: 25 October 2020
Revised: 06 January 2021
Accepted manuscript online: 08 January 2021
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PACS:
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78.20.nb
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(Photothermal effects)
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66.30.Xj
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(Thermal diffusivity)
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61.46.-w
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(Structure of nanoscale materials)
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Corresponding Authors:
S Sankararaman
E-mail: drssraman@gmail.com
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Cite this article:
Riya Sebastian, M S Swapna, Vimal Raj, and S Sankararaman Laser-induced thermal lens study of the role of morphology and hydroxyl group in the evolution of thermal diffusivity of copper oxide 2021 Chin. Phys. B 30 067801
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