Thermal conductivity of random polycrystalline BC3 nanosheets: A step towards realistic simulation of 2D structures
Fooladpanjeh S. Yousefi F. Molaei F. Zarghami Dehaghani M. Sajadi S.M. Abida O. Habibzadeh S. Hamed Mashhadzadeh A. Saeb M.R.
September 2021Elsevier Inc.
Journal of Molecular Graphics and Modelling
2021#107
Boron carbide nanosheets (BC3NSs) are semiconductors possessing non-zero bandgap. Nevertheless, there is no estimation of their thermal conductivity for practical circumstances, mainly because of difficulties in simulation of random polycrystalline structures. In the real physics world, BC3NS with perfect monocrystalline is rare, for the nature produces structures with disordered grain regions. Therefore, it is of crucial importance to capture a more realistic picture of thermal conductivity of these nanosheets. Polycrystalline BC3NS (PCBC3NSs are herein simulated by Molecular Dynamics simulation to take their thermal conductivity fingerprint applying ΔT of 40 K. A series of PCBC3NSs were evaluated for thermal conductivity varying the number of grains (3, 5, and 10). The effect of grain rotation was also modeled in terms of Kapitza thermal resistance per grain, varying the rotation angle (θ/2 = 14.5, 16, 19, and 25°). Overall, a non-linear temperature variation was observed for PCBC3NS, particularly by increasing grain number, possibly because of more phonon scattering (shorter phonon relaxation time) arising from more structural defects. By contrast, the heat current passing across the slab decreased. The thermal conductivity of nanosheet dwindled from 149 W m−1 K−1 for monocrystalline BC3NS to the values of 129.67, 121.32, 115.04, and 102.78 W m−1 K−1 for PCBC3NSs having 2, 3, 5, and 10 grains, respectively. The increase of the grain̛s rotation angle (randomness) from 14.5° to 16°, 19° and 25° led to a rise in Kapitza thermal resistance from 2⨯10−10 m2 K·W−1 to the values of 2.3⨯ 10−10, 2.9⨯10−10, and 4.7⨯ 10−10 m2 K·W−1, respectively. Thus, natural 2D structure would facilitate phonon scattering rate at the grain boundaries, which limits heat transfer across polycrystalline nanosheets.
2D nanomaterials , Boron-carbide , Grain boundary , Molecular dynamics simulation , Nanosheet , Polycrystalline , Thermal conductivity
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Department of Mechanical Engineering, Shahrood Branch, Islamic Azad University, Shahrood, Iran
Department of Physics, University of Zanjan, Zanjan, 45195-313, Iran
Mining and Geological Engineering Department, The University of Arizona, AZ, United States
Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
Department of Nutrition, Cihan University-Erbil, Kurdistan Region, Iraq
Department of Phytochemistry, SRC, Soran University, KRG, Iraq
College of Engineering and Technology, American University of the Middle East, Kuwait
Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Mechanical and Aerospace Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Department of Mechanical Engineering
Department of Physics
Mining and Geological Engineering Department
Center of Excellence in Electrochemistry
Department of Nutrition
Department of Phytochemistry
College of Engineering and Technology
Department of Chemical Engineering
Mechanical and Aerospace Engineering
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