Size-dependent freezing temperature of metallic and semi-metallic nanoparticles
Size-dependent freezing temperature of metallic and semi-metallic nanoparticles
复制标题
金属和半金属纳米粒子的尺寸依赖性冻结温度
DOI：
10.1016/j.materresbull.2014.12.010
复制
发表时间：
2015-03-01
影响因子：
5.4
通讯作者：
Li, M.
中科院分区：
文献类型：
--
作者：
Zhu, T. S.;Li, M.
根据经典成核理论，考虑尺寸和温度对固液界面能的影响，研究了尺寸对金属和半金属纳米颗粒凝固温度的影响。这个简易模型的优点是能够预测低维材料的冻结温度，从字面上没有任何任意可调的参数。它预测，冻结温度几乎呈指数下降，由于增加的表面积/体积比的尺寸减小。此外，还预测了熔化温度和凝固温度之差消失的临界半径。模型预测结果与已有的Pb和Bi纳米粒子的实验结果吻合较好，这为理解纳米材料的冻结行为提供了一种简单的方法。(C)2014爱思唯尔有限公司版权所有。
The influence of size on freezing temperature of metallic and semi-metallic nanoparticles is investigated according to the classical nucleation theory by considering size and temperature effect on solid-liquid interface energy. The advantage of this improvised model is the ability to predict the freezing temperature for low dimensional materials, literally free from any arbitrarily adjustable parameters. It predicts that freezing temperature decreases almost exponentially with decreasing size due to the increasing surface/volume ratio. In addition, the critical radius at which the difference between the melting and freezing temperature disappears has been predicted. The model predictions agree well with available experimental results of Pb and Bi nanoparticles, which supply an easy way to understand freezing behavior of nanomaterials. (C) 2014 Elsevier Ltd. All rights reserved.