Modeling the Size Dependence of Specific Heat Capacity and Thermal Expansion Coefficient of Metallic Nanocrystals

IF 0.9 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER
Hongchao Sheng, Beibei Xiao, Xiaobao Jiang
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引用次数: 0

Abstract

At mesoscale, materials always exhibit a variety of novel properties that are completely different from those of bulk. In this work, the size (D) dependence functions of specific heat capacity Cp(D) and thermal expansion coefficient α(D) for metallic nanocrystals is built. The proposed model shows a good agreement as compared with the available experimental an simulation data of metal nanocrystals. Both Cp(D) and α(D) increase following the drop of D. In addition, it is found that the ratio of the solid/liquid interface energy γsl to surface stress f dominate the size dependence of Cp(D) and α(D), and this influence of γsl/f on Cp(D) and α(D) become greater as D decrease.

Abstract Image

金属纳米晶体比热容和热膨胀系数的尺寸依赖性建模
在介观尺度上,材料总是表现出各种完全不同于块体的新特性。本研究建立了金属纳米晶体比热容 Cp(D) 和热膨胀系数 α(D) 的尺寸(D)相关函数。与现有的金属纳米晶体实验和模拟数据相比,所提出的模型显示出良好的一致性。此外,研究还发现,固/液界面能γsl 与表面应力 f 的比值主导了 Cp(D) 和 α(D) 的尺寸依赖性,而且随着 D 的减小,γsl/f 对 Cp(D) 和 α(D) 的影响也越来越大。
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来源期刊
Physics of the Solid State
Physics of the Solid State 物理-物理:凝聚态物理
CiteScore
1.70
自引率
0.00%
发文量
60
审稿时长
2-4 weeks
期刊介绍: Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.
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