Nanoparticle manipulation with atomic force microscopy techniques - (NANOPARMA)

使用原子力显微镜技术操纵纳米粒子 - (NANOPARMA)

• 批准号: 68809968
• 负责人: Professor Dr. Peter Reimann
• 金额: --
• 依托单位: Arbeitsgruppe Theorie der Kondensierten Materie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/68809968?language=en
• 关键词: Nanoparticle; manipulation; atomic; force; microscopy

Atomic force microscopy (AFM) has proven to be a powerful tool to investigate frictional forces of nanoscale contacts. Unfortunately, this technique reveals some drawbacks when applied to study chemical and structural properties of two rubbing surfaces. The tips used in AFM are prefabricated. Consequently one of the two rubbing surfaces usually consists of a silicon compound and the effective size of the contact will be mainly determined by commercially available tip radii. However, urgent current questions concern the contact area dependence as well as the influence of the material on tribological properties. The contact area dependence of friction is crucial in bridging the gap between nanoscale and microscale friction, which eventually will allow us to understand and control macroscopic friction. The right choice of materials, on the other hand, is expected to lead to new friction effects, like, e.g., superlubricity.A solution of this problem is to use the AFM as a manipulation tool, through the controlled pushing of nanoparticles on the surface. In this case the properties of the surfaces and the nanoparticles can be chosen from a wide range of material combinations. The AFM tip is then used to push the individual particles along predefined pathways, while simultaneously evaluating the frictional forces. Apart from answering long-standing questions regarding fundamental issues in nanoscale tribology, these studies will be able to address issues of controlled motion of the particles for practical applications. In this cooperative research project we propose to investigate these effects systematically, addressing nanoparticles with different sizes, shapes and functional groups on their surfaces, as well as substrates with different roughness, structure and chemical composition in different environments, from liquids to ultrahigh vacuum. The experimental studies are harmonized with theoretical investigations concerning the manipulation process itself, as well as the interfacial atomic processes during particle translation.

事实证明，原子力显微镜（AFM）是研究纳米级接触的摩擦力的强大工具。不幸的是，该技术揭示了在研究两个摩擦表面的化学和结构特性时的一些缺点。 AFM中使用的技巧是预制的。因此，两个摩擦表面之一通常由硅化合物组成，接触的有效尺寸将主要由市售的尖端半径确定。但是，紧急目前的问题涉及接触区域依赖以及材料对摩擦学特性的影响。摩擦的接触面积依赖性对于弥合纳米级和微观摩擦之间的间隙至关重要，这最终将使我们能够理解和控制宏观摩擦。另一方面，正确的材料选择将导致新的摩擦效应，例如，例如，超润滑性。该问题的解决方案是通过在表面上控制纳米颗粒的控制，将AFM用作操纵工具。在这种情况下，可以从多种材料组合中选择表面和纳米颗粒的性质。然后使用AFM尖端将单个颗粒沿预定义的途径推动，同时评估摩擦力。除了回答有关纳米级摩擦学基本问题的长期问题外，这些研究还能够解决粒子在实际应用中受控运动的问题。在该合作研究项目中，我们建议系统地研究这些效果，以解决其表面上具有不同大小，形状和官能团的纳米颗粒，以及在不同环境中，从液体到超高真空的不同环境中具有不同粗糙度，结构和化学组成的底物。实验研究与有关操纵过程本身以及粒子翻译过程中的界面原子过程进行了协调。