卡达尔-帕里西-张的粗与核化有限的稳定晶体生长相关
1Faculty of Engineering, Osaka Electro-Communication University, Hatsu-cho, Neyagawa, Osaka, 572-8530, Japan. nori3@phys.osakac.ac.jp.
Scientific reports
|September 26, 2023
概括
晶体表面的粗度会影响材料的性能. 数字模拟显示,虽然一些表面表现出Kardar-Parisi-Zhang (KPZ) 粗度,但由于步骤动态和岛屿形成,其他表面显示出Berezinskii-Kosterlitz-Thouless (BKT) 粗度.
科学领域:
- 表面科学是一门科学.
- 凝聚物质物理学 凝聚物质物理学
- 材料科学是一种材料科学.
背景情况:
- 晶体表面的粗度和形状影响多尺度现象,影响摩擦和光学等材料特性.
- 理论模型预测了Kardar-Parisi-Zhang (KPZ) 对于生长的晶体表面的普遍性,但实验观测很少.
研究的目的:
- 调查理论预测和实验观察晶体生长中的KPZ特性之间的差异.
- 通过使用数值模拟,探索纳米级晶体生长中控制表面粗性的机制.
主要方法:
- 在纳米级格子模型上进行了广泛的蒙特卡洛模拟.
- 结晶生长速度和表面粗度 (表面宽度) 为不同的结晶学方向计算.
主要成果:
- 在单核生长中,A (001) 表面是光滑的,但在多核生长中,KPZ缩放时,热力学上是粗的.
- 倾斜的表面表现出接近平衡的Berezinskii-Kosterlitz-Thouless (BKT) 粗度.
- 在 (001) 和 (111) 露台上的特定阶梯类型诱导KPZ粗度,而阶梯岛相互作用促进BKT粗度.
结论:
- 该研究通过确定不同的生长模式和表面行为,弥合了理论KPZ预测和实验发现之间的差距.
- 核化,阶段动态和岛屿形成的相互作用决定了晶体表面是否表现出KPZ或BKT粗度.
- 了解这些粗机制对于控制由表面形态学影响的材料特性至关重要.
相关概念视频
Ziegler–Natta Chain-Growth Polymerization: Overview
3.3K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.3K
Crystal Growth: Principles of Crystallization
2.1K
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...
2.1K
Recrystallization: Solid–Solution Equilibria
1.1K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
1.1K
Radical Chain-Growth Polymerization: Mechanism
2.6K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.6K
Step-Growth Polymerization: Overview
3.5K
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...
3.5K
Precipitation Processes
483
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
483


