相关实验视频

Updated: Jun 15, 2025

Studying the Effects of Temperature on the Nucleation and Growth of Nanoparticles by Liquid-Cell Transmission Electron Microscopy

Studying the Effects of Temperature on the Nucleation and Growth of Nanoparticles by Liquid-Cell Transmission Electron Microscopy

Published on: February 17, 2021

气溶Au纳米颗粒结晶的开始:积累和爆炸性核化

Yi Wang^1,2, Eirini Goudeli³

¹Particle Technology Laboratory, Department of Mechanical and Process Engineering, ETH Zürich, Zürich, CH-8092, Switzerland.

|August 27, 2024

概括

气相金纳米粒子结晶发生在融点和结点之间的超稳定区域. 分子动力学模拟揭示了不同的结晶阶段和两个核化途径,影响了晶体大小和分布.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
物理化学物理化学

背景情况:

黄金纳米粒子通过气溶过程合成,如火焰或等离子体沉积.
了解气相结晶对于控制纳米粒子特性至关重要.

研究的目的:

使用分子动力学研究气相中的金纳米粒子结晶.
确定结晶机制,元稳定区域和核化途径.

主要方法:

金纳米粒子结晶的分子动力学 (MD) 模拟.
对粒子大小依赖的超稳定区域和同热结晶阶段的分析.
使用局部晶体乱和生成X射线衍射 (XRD) 模式量化结晶度.

主要成果:

在点和点之间存在一个粒子大小依赖的超稳定区域 (200-300°C).
观察了两个结晶阶段 (亚临界和超临界集群形成).
确定了爆炸和积累的两个核化途径,影响了晶体大小和分布.

结论:

气相金纳米粒子结晶是复杂的,受温度,冷却速率和粒子大小的影响.
该研究阐明了不同的结晶机制,并提供了对控制纳米粒子合成的见解.
与XRD模式生成相结合的MD模拟为研究纳米粒子动态提供了强大的工具.

更多相关视频

Gold Nanoparticle Synthesis

Gold Nanoparticle Synthesis

Published on: July 10, 2021

A System to Create Stable Nanoparticle Aerosols from Nanopowders

A System to Create Stable Nanoparticle Aerosols from Nanopowders

Published on: July 26, 2016

相关概念视频

Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

Crystal Growth: Principles of Crystallization

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...