用硫酸聚乙烯糖醇覆盖的黄金接口中的热传递:一个分子动力学研究
Sydney A Shavalier1, J Daniel Gezelter1
1Nieuwland Science Hall, Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States.
The journal of physical chemistry. B
|November 18, 2023
概括
功能化黄金接口与化聚乙烯糖醇 (PEG) 显示了增强的热传输. 结合和低频模式有助于改善热导电性,尽管存在金硫结合障碍.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
- 表面科学是一门学科.
背景情况:
- 了解界面上的热传输对于纳米材料的热管理至关重要.
- 金属表面的功能化可以改变其热性能.
- 聚乙烯甘醇 (PEG) 是一种用于表面修饰的多功能聚合物.
研究的目的:
- 通过用硫化聚乙烯甘醇 (PEG) 功能化的黄金接口来研究热传输.
- 为了确定金属极化性和接口几何学对热性质的影响.
- 阐明增强界面热导率背后的机制.
主要方法:
- 反向不平衡分子动力学 (MD) 模拟.
- 使用嵌入式原子模型 (EAM) 和极化密度调整嵌入式原子模型 (DR-EAM).
- 研究了各种金色方面 ((111), (110), (100)) 和纳米粒子 (10-20 Å半径).
主要成果:
- 化PEG覆盖的黄金接口比原始黄金具有更高的接口导热率.
- 平面和球形接口之间的结合模式不同,影响能量传输.
- 黄金-硫共价键对导热构成一个重要的障碍.
- 纳米粒子显示出增强的低频传热模式,与更高的导电率相关.
结论:
- 使用硫化PEG的表面功能化有效地增强了黄金界面的热传输.
- 接口几何和溶剂相互作用在调节热性质方面发挥着关键作用.
- 分子动力学模拟提供了有关界面热传递的原子层机制的见解.
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