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Chin. Phys. B, 2021, Vol. 30(6): 067801    DOI: 10.1088/1674-1056/abd9b5

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
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.
Keywords:  thermal diffusivity      CuO      thermal lens      morphology      hydroxyl group  
Received:  25 October 2020      Revised:  06 January 2021      Accepted manuscript online:  08 January 2021
PACS:  78.20.nb (Photothermal effects)  
  66.30.Xj (Thermal diffusivity)  
  61.46.-w (Structure of nanoscale materials)  
Corresponding Authors:  S Sankararaman     E-mail:

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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