使用TMMC和预先生成的形态图书馆,对聚合物在明确溶剂中的可扩展的自由能量计算
Monika Narayan Angwani1, Kaustubh Rane2
1Department of Physics, Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat 382055, India.
The Journal of chemical physics
|July 2, 2025
概括
我们开发了一种使用过渡矩阵蒙特卡罗 (TMMC) 和增长扩展组合 (GEE) 的新方法来计算溶剂中的聚合物自由能量. 这种灵活,可扩展的方法可以根据溶剂质量准确预测聚合物构成.
科学领域:
- 计算物理学的计算物理.
- 聚合物科学 聚合物科学
- 统计力学就是统计力学.
背景情况:
- 在显式溶剂中计算聚合物自由能量在计算上具有挑战性.
- 现有的方法往往在抽样效率和灵活性方面扎.
- 了解不同溶剂条件下的聚合物行为对于宏分子热力学至关重要.
研究的目的:
- 提出一种新的,计算效率高,可扩展的方法来计算聚合物在明确溶剂中的相对自由能量.
- 在增长扩展合奏 (GEE) 框架内利用过渡矩阵蒙特卡洛 (TMMC) 算法.
- 为了使自由能源计算成为选定的集体变量 (CVs) 的函数.
主要方法:
- 将TMMC与GEE框架集成,用于在蒙特卡洛模拟中进行增强的采样.
- 在真空中使用预先生成的聚合物构造库.
- 将该方法应用于明确的莱纳德-斯溶剂中的柔性聚合物模型,以旋转半径为函数计算自由能量.
主要成果:
- 该方法成功计算了无偏差的概率分布和相对自由能量.
- 通过使用不同的聚合物-溶剂相互作用强度来证明方法的灵活性.
- 观察到聚合物在良好的溶剂中采用扩展形状,在不良的溶剂中采用崩形状,与理论预测保持一致.
结论:
- 提出的TMMC-GEE框架提供了一个计算效率高且可扩展的解决方案,用于高分子无能量计算.
- 该方法对各种采样技术,CV和并行架构的适应性使其具有广泛的适用性.
- 这项工作为聚合物物理和宏分子热力学提供了宝贵的见解,特别是关于溶剂对聚合物构成的影响.
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