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银纳米颗粒的异性增长是通过聚烯胺结合来动力控制的
Zhifeng Chen1, Ji Woong Chang1,2, Choumini Balasanthiran1
1Department of Chemical Engineering , Pennsylvania State University , University Park , Pennsylvania 16802 , United States.
Journal of the American Chemical Society
|January 19, 2019
概括
聚烯 (PVP) 影响银纳米粒子 (Ag NP) 的形状,但热力学控制不太可能. 这项研究表明PVP吸附在Ag100) 和Ag111) 方面表明动力控制对AgNP形状更为重要.
科学领域:
- 材料科学
- 纳米技术
- 物理化学
背景情况:
- 聚烯 (PVP) 通常用于合成控制形状的银纳米粒子 (Ag NPs),通常为立方体.
- 控制这种形状的确切机制尚未完全理解.
- 人们普遍认为PVP优先结合Ag100) 层而不是Ag111层,从而产生热力学控制.
研究的目的:
- 通过PVP研究AgNP合成中的形状控制机制.
- 为了确定PVP对不同银面的吸附热力学 (Ag100和Ag111).
- 评估热力学与动力学控制在PVP介导的Ag NP塑造中的作用.
主要方法:
- 在各种 Ag NP 形状上测量 PVP 的吸附同热量.
- 在Ag100和Ag111) 方面确定PVP的平衡吸附常数.
- 应用Wulff构造来分析吸附数据的热力学影响.
主要成果:
- 发现PVP的平衡吸附常数独立于PVP的分子量.
- 吸附只对NP形状和Ag方面有很小的依赖.
- 在Ag11上PVP的吸附常数 (2.8M−1) 大约是Ag100 (5M−1) 的一半.
结论:
- 通过热力学控制,观察到的PVP吸附在Ag100和Ag111方面的差异不足以解释立方AgNP的流行.
- 这些发现强烈表明动力控制,而不是热力学控制,在塑造使用PVP的Ag纳米粒子中起着重要作用.
- 这项研究强调了纳米粒子合成和设计中考虑运动因素的重要性.
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