岛屿形成在异质形生长中的岛屿形成
Frederik Munko1, Catherine Cruz Luukkonen1, Ismael S S Carrasco2
1Eberhard Karls Universität Tübingen, Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen, Germany.
Physical review. E
|April 18, 2025
概括
薄膜沉积中的岛屿形成从层次转移到具有较弱基质结合的岛屿生长. 这种对材料性质至关重要的转变通过模拟和缩放方法进行分析.
科学领域:
- 材料科学与工程 材料科学与工程
- 表面科学和薄膜沉积
背景情况:
- 岛屿形成是异质性皮质薄膜生长中的关键现象,影响材料特性.
- 了解从层次增长 (LBL) 到岛屿增长 (ISL) 的过渡对于控制膜形态至关重要.
研究的目的:
- 分析从LBL到ISL的过渡,在无应变的异质质沉积中增长.
- 调查基质结合强度和粒子扩散性对生长模式转换的影响.
- 建立一个热力学和动力学框架来预测LBL-ISL过渡点.
主要方法:
- 动力蒙特卡罗 (KMC) 模拟使用两个最小格子模型.
- 应用缩放方法和热力学分析来确定岛屿的稳定性.
- 将模拟结果与各种运动参数的理论预测进行比较.
主要成果:
- LBL-ISL过渡是由较弱的基质结合驱动的,相当于增加的表面扩散率.
- 过渡区域的特征是准平衡状态,具有显著的层间粒子流.
- 对紧岛屿的热力学预测与KMC模拟相关,特别是关于第二层稳定性的.
结论:
- 该研究提供了一个统一的框架,将LBL-ISL过渡的动力学和热力学方面联系起来.
- 过渡发生在部分湿平衡状态下,在低沉积率下缓慢收.
- 精确的过渡点的实验实现是具有挑战性的,因为缓慢的收动力学.
相关概念视频
Crystal Growth: Principles of Crystallization
1.4K
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...
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...
1.4K
Mechanism of Lamellipodia Formation
2.4K
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
2.4K
Step-Growth Polymerization: Overview
3.3K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...
3.3K


