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通过在现场溶液相原子力显微镜从表面限制的种子中探索块共聚物纳米纤维的"活生生"生长

Robert L Harniman¹, Samuel Pearce^1,2, Ian Manners^3,4

¹School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom.

Journal of the American Chemical Society

|January 5, 2022

概括

表面封闭块共聚物 (BCP) 纳米纤维在四个阶段生长,从表面结合到表面独立生长. 这种种子组装途径为各种应用提供了可控的纳米粒子尺寸.

科学领域:

材料科学
聚合物化学
纳米技术

背景情况:

活体结晶驱动的自我组装是制造均纳米粒子的关键方法.
块共聚合物 (BCP) 纳米纤维的表面限制生长是一个新兴的兴趣领域.

研究的目的:

从表面上的固定种子中研究BCP纳米纤维的生长机制.
使用原子力显微镜 (AFM) 描述表面限制的种子生长的阶段和动态.

主要方法:

使用原子力显微镜 (AFM) 进行现场研究和现场研究.
分析了AFM视频数据以实时观察纳米纤维生长动态.
研究的表面结合和表面独立的生长模式.

主要成果:

确定了四个阶段的生长过程:最初的表面限制,过渡到表面限制,最后是表面独立的生长.
观察到AFM尖端诱导的核心碎片,碎片仍然活跃以进一步增长.
当种子以角度定位时,检测到单向生长,限制了单向生长.

结论:

表面封闭影响BCP纳米纤维的生长,随着纳米纤维的延长,动态变化.
表面的种子生长为控制纳米粒子形态和尺寸提供了途径.
在纳米尺度上阐明复杂的自我组装过程.

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