在柔性交联凝中扩散的静电阻碍:一个粗粒度模拟研究.
Luis Pérez-Mas1, María Del Mar Ramos-Tejada1, Alberto Martín-Molina2,3
1Departamento de Física, Escuela Politécnica Superior de Linares, Universidad de Jaén, 23700 Linares, Jaén, Spain.
The Journal of chemical physics
|July 5, 2023
概括
静电力显著影响柔性凝中的溶液扩散,改变扩散系数和异常指数. 链的灵活性起着至关重要的作用,即使在高离子强度下也是如此.
科学领域:
- 聚合物物理 聚合物物理
- 软物质物理学 软物质物理学
- 计算化学是一种计算化学.
背景情况:
- 凝中的溶液扩散受各种因素的影响,包括静电相互作用.
- 了解这些相互作用对于涉及凝的应用至关重要,例如药物输送和分离技术.
- 以前的模型经常简化了溶液,多电解质链和溶剂环境之间的复杂相互作用.
研究的目的:
- 研究静电力对柔性聚电解质凝中溶液扩散的影响.
- 分析溶液电荷,多电解质电荷和离子强度对扩散动态的影响.
- 为了比较灵活与刚性凝环境中的扩散.
主要方法:
- 使用粗粒度模拟来建模系统.
- 布朗的动力学算法被用来模拟溶液颗粒和多电解质链的运动.
- 进行了静电参数 (溶质电荷,多电解质电荷,离子强度) 的系统变化.
主要成果:
- 扩散系数和异常扩散指数对溶液或多电解质的电荷逆转很敏感.
- 在低离子强度下观察到柔性和刚性凝之间的扩散系数有显著差异.
- 链的灵活性会影响异常扩散指数,即使在高离子强度 (100毫米) 上也是如此.
- 与变化的溶解物颗粒电荷相比,变化的多电解质链电荷具有明显的效果.
结论:
- 静电相互作用是柔性凝中溶液扩散动态的一个关键决定因素.
- 凝的灵活性显著影响扩散行为,特别是在较低的离子强度.
- 变化的特定电荷参数 (溶液与多电解质) 会导致对扩散的非相同效应.
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