揭示了静电力在对立的多电解质刷之间吸引力的作用
Debadutta Prusty1, Alejandro Gallegos2, Jianzhong Wu1
1Department of Chemical and Environmental Engineering, University of California, Riverside, California 92507, United States.
Langmuir : the ACS journal of surfaces and colloids
|January 18, 2024
概括
类似电荷的聚合物刷可以由于静电和排斥体积效应而相互吸引,特别是在多价值对照器中. 这个景点的吸引力.
科学领域:
- 软物质物理学 软物质物理学
- 聚合物科学 聚合物科学
- 物理化学 物理化学
背景情况:
- 静电相互作用和排除体积效应驱动软物质的复杂行为.
- 多电解质刷表现出诸如电荷逆转和相似电荷之间的吸引等现象.
研究的目的:
- 在对立的多电解质刷中调查表面力量和胀.
- 分析静电和排除体积相关性对刷间相互作用的影响.
主要方法:
- 使用了经典的密度函数理论 (DFT).
- 考虑到静电和排除体积相关性.
- 将理论结果与平均场预测进行比较.
主要成果:
- 同样充电的刷子之间的分离压力对盐度敏感.
- 观测到的负分离压力 (吸引力) 与多价值计数器.
- 吸引力强度和范围随着对比价值增加.
- 较小的 counterions 通过更有效地中和聚合物电荷来增强吸引力.
- 在没有大小诱导的相关性的情况下,刷间的吸引力会消失.
结论:
- 对应效应对于理解表面力和刷结构至关重要.
- 多价值指针和较小的指针尺寸促进了具有相同电荷的刷子之间的吸引力.
- 理论预测与实验观测一致,为聚合物刷相互作用提供了洞察力.
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