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bingd600420

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AFM是在针尖距离样品于纳米范围内进行测量的,在针尖与样品表面的至近距离形成一个局域化的“场”,这一局域化场有利于人们了解材料表面的纳米、分子、和原子尺度的形貌及探测原子、分子间的力和其物理与化学性质[2]。由于扫描探针显微技术不但具有纳米级分辨率,而且制样简单,可在溶液中原位进行表面成像和力学、物理、化学等性能的测量,并优于其他仪器从而得到广泛的应用[3]。AFM可通过力-距离曲线来研究物质与物质表面的相互作用,表征材料表面的许多性能,并在此基础上进一步展开性能研究[4]。图1为pH值为7时MgCl2浓度在10-4mol/L到10-2mol/L范围内的作用力随作用距离的变化关系。

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Risingstar

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bingd600420(金币+25, 翻译EPI+1): 谢谢你 ! 2011-01-16 19:50:21
Atomic Force Microscopy (AFM) measures quantities when the probing tip is brought into nanometers distance to the sample. In the close proximity between the tip and sample surface a localized "field" is formed, which facilitates understanding of nano-scale, molecular, and atomic-scale morphology and detection of forces between atoms and molecules and its physical and chemical properties [2]. Scanning probe microscopy is widely adopted in various applications, because it offers not only nano-scale resolution, but easy sample preparation, as well as measurement of surface imaging, force, physical and chemical properties in liquids with better performance [3]. Through a force-distance curve, AFM enables study of interactions between surfaces, characterization of various surface properties, and on this basis further performance investigation [4]. The interactive force variation with respect to distance for MgCl2 with pH=7 and a concentration from 10-4mol/L to 10-2mol/L is shown in Fig.1.
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