纳米金属稳定性及其研究成果

M. Vigdorowitsch
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引用次数: 0

摘要

提出了一种基于热力学的方法来确定金属纳米系综的稳定性条件。这与物质的[超]分散导致热力学势(TPs)与相同性质的块状晶体相比的变化有关。这种次元现象由两个部分组成。其中包括空位相关效应导致的TPs减少和表面张力效应导致的TPs增加。甚至考虑了粒子在系综中大小的线性、指数和正态分布。所得方程已应用于铟或金粒子的纳米系综。超小粒子的存在使得真空相关效应比表面张力效应更明显,促进了体系的稳定性。随着超小颗粒数量的减少,空位相关效应急剧减弱,并可能屈服于表面张力效应,从而导致稳定性的丧失。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nano-Metal Stability and its Outcomes
A thermodynamics-based approach to determining stability conditions for metallic nano-ensembles is proposed. It is related to that [ultra-]dispersing the substance leads to changes in thermodynamic potentials (TPs) compared to those of a massive crystal of the same nature. This dimensional phenomenon consists of two components. Among those are a reduction of TPs due to vacancy-related effects and an increase of TPs due to the surface tension effect. Even linear, exponential, and normal distributions of particles on their size in the ensemble have been considered. The resulting equations have been applied to the nano-ensembles of either In or Au particles. The presence of ultra-small particles in an ensemble makes the vacancy-related effect more apparent than the surface tension effect, promoting system stability. With the decrease in the number of ultra-small particles, the vacancy-related effect drastically diminishes and can yield to the surface tension effect, thereby leading to the loss of stability.
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