在固定和非固定玻璃成型系统中,集体动态长度单调地增加
Rajsekhar Das1, T R Kirkpatrick2, D Thirumalai1,3
1Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, USA.
The Journal of chemical physics
|February 4, 2025
概括
随机第一阶转换 (RFOT) 理论
科学领域:
- 软物质物理学 软物质物理学
- 玻璃过渡物理 玻璃过渡物理
- 体系统 体系统
背景情况:
- 随机第一阶过渡 (RFOT) 理论描述了玻璃过渡附近的液体动态.
- 它预测域增长和相关长度增长与压缩在临界体积分数 (φd) 以上.
- 之前的研究表明,动态长度依赖于粒子固定方法,造成不一致性.
研究的目的:
- 在固定和未固定系统中协调动态长度的增长.
- 引入一种新的方法来测量独立于固定效应的集体动态.
- 为了解玻璃成型液体提供一致的理论框架.
主要方法:
- 模拟和成像实验被用来探测粒子动力学.
- 在不同的固定条件下 (完全或随机固定) 分析了单个粒子动态.
- 引入了一种新的多粒子结构因子Smpc(q,t,以探讨集体动力学.
主要成果:
- 从单粒子运动中提取的动态长度显示出非单调的行为和依赖固定.
- 这与未固定系统中的四点结构因子的预测形成鲜明对比.
- 集体动态长度,来自Smpc(q,t),在固定和未固定系统中表现出单调的增长与体积分数.
结论:
- 多粒子结构因子 (Smpc(q,t)) 提供了一个可靠的集体动态测量,独立于固定.
- 集体动态长度随体积分数单调增加,提供玻璃过渡动态的一致图像.
- 这一发现适用于体系统,不受盐的影响,可以通过实验验证.
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