通过现场原子力显微镜揭示了对Diblock共聚物纳米粒子-晶体相互作用的机械洞察
Coit T Hendley1, Lee A Fielding2, Elizabeth R Jones3
1Department of Materials Science and Engineering , Cornell University , Ithaca , New York 14853 , United States.
Journal of the American Chemical Society
|June 20, 2018
概括
视觉化了纳米颗粒与生长中的石晶体的相互作用. 阳性聚合物纳米颗粒显示出更高的结合率,这表明了改善纳米复合物形成的设计原则.
科学领域:
- 材料科学
- 纳米技术
- 晶体学
背景情况:
- 纳米颗粒可以被纳入单晶体,形成纳米复合材料.
- 了解有机-无机界面上的纳米级相互作用对于控制闭塞至关重要.
- 石作为研究这些相互作用的模型系统.
研究的目的:
- 可视化和理解双块共聚物纳米粒子与不断增长的岩表面之间的纳米级相互作用.
- 研究纳米粒子表面化学如何影响相互作用模式和遮蔽效率.
- 提出解释纳米粒子结合观察到的差异的机制.
主要方法:
- 现场原子力显微镜 (AFM) 用于实时观察纳米粒子-石相互作用.
- 合成了具有不同稳定剂块 (非离子Ph-PGMA,碳酸尖端HOOC-PGMA和离子PMAA) 的二块共聚物纳米颗粒.
- 根据纳米粒子表面化学量化了相互作用模式 (附着/分离,悬浮,结合).
主要成果:
- 确定了三种不同的交互模式:连接/分离,悬浮和整合.
- 与碳酸尖型聚甲酸 (HOOC-PGMA) 纳米颗粒相比,稳定型聚甲酸 (PMAA) 的"浮动"或合并率显著更高 (约85%).
- 对于离子纳米粒子,提出了一种双态结合机制,涉及"浮动"的延长稳定剂链和结合的崩链.
结论:
- 纳米颗粒表面化学,特别是阳离子稳定剂块的存在,强烈影响与生长的晶体的相互作用.
- 拟议的双态结合机制为理解和预测纳米粒子封闭提供了一个框架.
- 这项研究提供了提高晶体生长中纳米粒子结合效率的设计原则,用于先进的纳米复合材料制造.
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