异质系统中的化学力谱学:涉及环氧聚合物,混合单层和极性溶剂的分子间相互作用
Dmitri V Vezenov1, Andrew V Zhuk, George M Whitesides
1Department of Chemistry and Chemical Biology and Division of Applied Sciences and Engineering, Harvard University, Cambridge, Massachusetts 02138, USA. dvezenov@calimetrics.com
Journal of the American Chemical Society
|August 29, 2002
概括
化学力显微镜揭示了表面能量和溶剂组成如何影响环氧树脂和自组装单层之间的粘附力. 结合和溶剂排斥显著影响了界面相互作用.
科学领域:
- 表面科学和纳米技术
- 聚合物科学 聚合物科学
- 物理化学 物理化学
背景情况:
- 纳米级的粘附力对于材料接口至关重要.
- 了解表面化学,液体介质和粘附之间的相互作用对于材料设计至关重要.
- 环氧树脂和自组装单层 (SAM) 呈现复杂的界面行为.
研究的目的:
- 使用化学力显微镜 (CFM) 研究环氧树脂和SAM之间的粘合力.
- 系统地检查液体介质对粘附的影响.
- 为了将宏观测量与纳米尺度粘附现象相关联.
主要方法:
- 化学力显微镜 (CFM) 用于测量纳米级粘合力.
- 接触角度测量用于宏观表面特征.
- 使用分子间力成分理论和表面张力成分方法进行分析.
主要成果:
- 粘附力强烈依赖于尖端,聚合物和液体介质的分子性质.
- 在混合酒精水溶剂中观察到表面自由能量和粘附力之间的直接相关性.
- 从接触区排除溶剂和结相互作用之间的竞争被确定为关键因素.
结论:
- 对于异质系统,CFM数据可以使用表面张力组件方法进行定量合理化.
- 溶剂和表面组之间的结竞争对粘附力有很大影响.
- 环氧聚合物中的不弹性变形也在测量粘附性方面发挥着重要作用.
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