预测晶体在分子玻璃的自由表面上生长的速度
Federico Caporaletti1,2, Martín Eduardo Villanueva2, Sascha Molitor1,2
1Laboratory of Polymer and Soft Matter Dynamics, Université libre de Bruxelles (ULB), Brussels 1050, Belgium. federico.caporaletti@ulb.be.
Materials horizons
|October 10, 2025
概括
有机玻璃在表面的结晶速度更快,这是由于集体小位移 (CSD) 的原因. 这一发现为晶体生长率提供了一个预测模型,影响制药和有机电子产品.
科学领域:
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 有机玻璃在自由表面的结晶率显著更快,相比于其大部分.
- 在接口上增强分子流动性的微观起源,驱动这种现象,仍然不太了解.
- 现有的理论难以解释快速的表面结晶,这对玻璃动力学研究构成了挑战.
研究的目的:
- 阐明有机玻璃中快速表面结晶背后的微观机制.
- 基于基本原则,开发表面晶体生长率的预测模型.
- 建立一个框架来控制玻璃和晶体的特性.
主要方法:
- 使用集体小位移 (CSD) 概念作为局部分子重排的概念,研究了表面结晶.
- 制定了一个最小模型,将晶体生长速度与热力学和能量因素联系起来.
- 对14种不同的有机分子的实验数据验证了模型.
主要成果:
- 表面晶体的生长是由集体小位移 (CSD) 解释的,这是一个由缓慢的阿雷尼乌斯过程 (SAP) 控制的过程.
- 开发的最小模型准确地预测了晶体生长率的幅度和温度依赖性.
- 该模型的预测与各种各样的有机分子的实验数据保持一致.
结论:
- 集体小位移 (CSD) 被确定为推动有机玻璃表面快速结晶的基本微观机制.
- 拟议的模型为理解和控制表面结晶提供了定量和预测框架.
- 这些发现对有机材料的稳定性和加工在药品和有机电子等领域具有重大影响.
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