3D可视化显示了密集的微凝系统中墙壁附近的冷却速度依赖的结晶
M P M Schelling1,2, T W J Verouden1,2, T C M Stevens1,2
1Department of Applied Physics and Science Education, Eindhoven University of Technology, Groene Loper 19, 5612 AP Eindhoven, The Netherlands. j.m.meijer@tue.nl.
Soft matter
|July 4, 2024
概括
冷却速度控制了墙壁附近的微凝悬浮液中的结晶和玻璃形成. 较快的冷却产生玻璃状结构,而较慢的冷却产生对齐的晶体域,影响微凝应用.
科学领域:
- 软物质物理学 软物质物理学
- 体科学 体科学 体科学
- 材料科学 材料科学 材料科学
背景情况:
- 控制的结晶,化和玻璃化是关键的自然和技术过程.
- 对这些相位转换的微观理解,特别是冷却速率和墙壁距离的影响,仍然不完整.
- 热敏微凝提供了一个平台,用于单颗粒水平研究因温度调节的粒子大小而导致的相位过渡.
研究的目的:
- 为了研究冷却速度对密集的微凝悬浮在墙壁附近的结晶核和玻璃形成的影响.
- 阐明冷却速率,墙壁影响和由此产生的固体结构 (晶体与玻璃) 之间的关系.
- 了解冷却速率如何影响晶体领域与墙壁的对齐.
主要方法:
- 使用的复合微凝具有硬核和热敏的多 (N-异烯酸烯胺-协同甲酸) .
- 采用共聚焦显微镜观察墙壁附近的密的体悬浮中的相变.
- 系统地改变了冷却速率,以研究流体到固体的过渡.
主要成果:
- 观察到从玻璃结构 (快速冷却) 过渡到晶体结构 (缓慢冷却).
- 证明冷却速率会影响晶体领域与墙壁对齐的程度.
- 确定了同质和异质核化之间的平衡,作为域对齐的机制.
结论:
- 冷却速率是一个关键参数,它决定了形成的固体结构的类型 (玻璃或晶体) 以及其相对于附近墙壁的方向.
- 这项研究为接近接口的温度控制结晶提供了宝贵的微观见解.
- 这些发现可以指导微凝应用的结晶条件的优化.
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