Study of size effect on thermophysical properties of metallic nanosolids

IF 1.1 4区工程技术 Q4 Engineering

High Temperatures-high Pressures Pub Date : 2023-01-01 DOI:10.32908/hthp.v52.1305

M. Goyal

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引用次数: 0

Abstract

In the present study, a phenomenological model based on thermodynamic variables is developed to study the thermophysical properties of nanomaterials with respect to size in nanoscale. The model input parameters are lattice packing fraction depending on crystal structure and atomic diameter of nanosolid. The shape parameter is incorporated in the model to study the variation in physical properties of metallic nanosolids with shape. The size and shape effect on melting temperature 𝑇𝑀𝑁, Debye temperature θ𝐷𝑁, Specific heat capacity 𝐶𝑁, thermal conductivity 𝐾𝑁 and electrical conductivity σ𝑁 is studied in metallic nanosolids. It is observed from the results obtained that both melting temperature and Debye temperature get reduced with reduction in size of nanosolid. Also Thermal conductivity and electrical conductivity in nanosolids decrease as size reduces. This is due to the increase in the number of surface atoms with size reduction and pronounced quantum confinement in nanomaterials. Also, the drastic change in number of surface atoms with the change in shape of the nanomaterial of same size brings about change in its thermophysical properties. The present model results are found consistent with the available experimental and simulated results of previous workers and may be useful for experimental researchers exploring the physical properties of nanomaterials.

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金属纳米固体热物理性质的尺寸效应研究

在本研究中，建立了一个基于热力学变量的现象学模型来研究纳米材料在纳米尺度上的热物理性质。模型输入参数为晶格堆积率，这取决于纳米固体的晶体结构和原子直径。在模型中引入形状参数，研究金属纳米固体的物理性质随形状的变化。研究了金属纳米固体的尺寸和形状对熔点温度𝑇𝑀、Debye温度θ𝐷、运行状态、比热容、导热系数𝐾、运行状态和电导率σ、运行状态的影响。结果表明，随着纳米固体尺寸的减小，熔融温度和德拜温度均降低。纳米固体的导热性和导电性也随着尺寸的减小而减小。这是由于纳米材料中表面原子数量的增加和尺寸的减小以及明显的量子限制。同样尺寸的纳米材料，其表面原子数随着形状的变化而急剧变化，其热物理性质也随之发生变化。本模型的结果与前人的实验和模拟结果一致，可能对实验研究人员探索纳米材料的物理性质有帮助。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

High Temperatures-high Pressures THERMODYNAMICS-MECHANICS

CiteScore

1.00

自引率

9.10%

发文量

期刊介绍： High Temperatures – High Pressures (HTHP) is an international journal publishing original peer-reviewed papers devoted to experimental and theoretical studies on thermophysical properties of matter, as well as experimental and modelling solutions for applications where control of thermophysical properties is critical, e.g. additive manufacturing. These studies deal with thermodynamic, thermal, and mechanical behaviour of materials, including transport and radiative properties. The journal provides a platform for disseminating knowledge of thermophysical properties, their measurement, their applications, equipment and techniques. HTHP covers the thermophysical properties of gases, liquids, and solids at all temperatures and under all physical conditions, with special emphasis on matter and applications under extreme conditions, e.g. high temperatures and high pressures. Additionally, HTHP publishes authoritative reviews of advances in thermophysics research, critical compilations of existing data, new technology, and industrial applications, plus book reviews.