Mechanism of atomic force microscopy imaging of three-dimensional hydration structures at a solid-liquid interface
Mechanism of atomic force microscopy imaging of three-dimensional hydration structures at a solid-liquid interface
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DOI：
10.1103/physrevb.92.155412
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发表时间：
2015-10-09
影响因子：
3.7
通讯作者：
Foster, Adam S.
中科院分区：
文献类型：
--
作者：
Fukuma, Takeshi;Reischl, Bernhard;Foster, Adam S.
在这里，我们使用原子力显微镜（AFM）对三维（3D）水化结构进行亚纳米成像，并对方解石-水界面进行分子动力学模拟。在AFM中，通过扫描纯水中的三维界面空间并记录尖端上的力，可以产生三维力图像，然后可以直接将其与模拟的三维水密度和模型尖端上的力进行比较。深入分析实验和模拟之间的相似性作为尖端样本距离的函数，使我们能够阐明力图像中的对比机制以及它们与水密度分布一致的原因。本工作旨在为水化结构的AFM成像奠定理论基础，并使其应用于未来分子尺度上重要界面过程的研究。
Here we present both subnanometer imaging of three-dimensional (3D) hydration structures using atomic force microscopy (AFM) and molecular dynamics simulations of the calcite-water interface. In AFM, by scanning the 3D interfacial space in pure water and recording the force on the tip, a 3D force image can be produced, which can then be directly compared to the simulated 3D water density and forces on a model tip. Analyzing in depth the resemblance between experiment and simulation as a function of the tip-sample distance allowed us to clarify the contrast mechanism in the force images and the reason for their agreement with water density distributions. This work aims to form the theoretical basis for AFM imaging of hydration structures and enables its application to future studies on important interfacial processes at the molecular scale.