几何学和纳米长度尺度与接口相互作用:AOT片状结构和反向微粒中的水动力学
David E Moilanen1, Emily E Fenn, Daryl Wong
1Department of Chemistry, Stanford University, Stanford, California 94305, USA.
Journal of the American Chemical Society
|May 20, 2009
概括
水与表面活性剂的比率,而不是纳米限制,决定了水界面动态. 由于接口特性,状结构显示水分子受到的影响比反向状分子更多.
科学领域:
- 物理化学 物理化学
- 表面科学是一门学科.
- 频谱学是一种光谱学.
背景情况:
- 了解水在接口上的行为对于各种科学领域至关重要.
- 像气溶OT (AOT) 这样的表面活性物形成了各种各样的纳米结构 (状,状) 与不同的水封闭.
- 区分封闭效应与界面相互作用是关键.
研究的目的:
- 调查控制水动态在界面上的主要因素.
- 为了比较状结构中的水界面相互作用与反向微粒.
- 阐明限制几何学,纳米长度尺度和水/接口相互作用的作用.
主要方法:
- 超快的红外光谱检测动态相互作用.
- 使用气溶OT (AOT) 形成状结构和反向.
- 基于表面对表面尺寸和水对表面活性剂的比率来比较结构.
主要成果:
- 水与表面活性剂的比率是水界面动态的主要决定因素,超过了纳米距离.
- 界面结构和特定的水表面活性剂相互作用显著影响水的扰动.
- 与反向微粒相比,状结构表现出更高比例的受影响水分子.
结论:
- 水界面相互作用对于水动力学来说比纳米限制更为关键.
- 状结构,具有更大的表面积和更深的水透,显示出更大的界面水扰动.
- 一个由两个组件组成的水模型 (散装式与接口式) 有效地量化了接口动态.
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