在水中观察离子扩散和反复跳跃运动.
Sangui Liu1, Xinbao Han1,2, Colin Ophus3
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Science advances
|July 28, 2023
概括
研究人员使用先进的显微镜观察了水中的聚氧甲 (POM) 离子动态. 他们发现离子表现出独特的跳跃运动,并形成短暂的活跃寡合体,揭示了溶液中的结构依赖相互作用.
科学领域:
- 解决方案化学 解决方案化学
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 了解溶液中的离子行为至关重要,但在实验上具有挑战性.
- 现有的模型缺乏对离子相互作用和溶解后动态的详细见解.
研究的目的:
- 想象和理解水中聚氧甲酸盐 (POM) 离子的实时扩散,聚合和运动.
- 研究影响离子动态和水溶液中的相互作用的因素.
主要方法:
- 利用液相传导电子显微镜 (LP-TEM) 在现场进行观察.
- 分析实时视频数据以跟踪单个离子运动和集群形成.
主要成果:
- 观察到 POM 离子的意想不到的局部反复跳跃运动,可能是由于水分子的桥接.
- 记录了在稀释溶液中高度活性离子寡合物的形成,分裂和重新排列.
- 确定了控制寡合体动态的弱反介导相互作用和四面体POM离子的结构依赖的定向相互作用.
结论:
- 实时观察为溶液中的离子行为提供了前所未有的洞察力.
- 水分子相互作用显著影响离子流动性.
- 离子的几何决定了它们的相互作用动态,突出了溶液中的结构-属性关系.
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