AFM研究微米和纳米纤维周围的边界层中的流体力学
AFM study of hydrodynamics in boundary layers around micro- and nanofibers
摘要：
粒子和周围液体之间的流体动力学相互作用的描述，下至纳米尺度，是最重要的，因为受限液体在许多自然和技术情况下是普遍存在的。在本文中，我们结合了三个非传统的原子力显微镜，研究微和纳米柱周围的流体力学。这些互补的方法允许在大范围的探针尺寸、流体粘度和请求条件下独立测量附加质量和摩擦项。一个理论模型的基础上的分析描述的速度场周围的探针表明，摩擦力取决于一个独特的参数，探针半径的粘性边界层的厚度的比率。我们表明，整个范围内的实验数据可以收集在一个主曲线，这是很好地再现了模型。这验证了这些原子力显微镜模式用于纳米流体动力学定量研究的用途，并为研究纳米级简单和复杂流体中的其他耗散源开辟了道路。
英文摘要：
The description of hydrodynamic interactions between a particle and the surrounding liquid, down to the nanometer scale, is of primary importance since confined liquids are ubiquitous in many natural and technological situations. In this paper, we combine three non-conventional atomic force microscopes to study hydrodynamics around micro- and nano-cylinders. These complementary methods allow the independent measurement of the added mass and friction terms over a large range of probe sizes, fluid viscosities and solicitation conditions. A theoretical model based on an analytical description of the velocity field around the probe shows that the friction force depends on a unique parameter, the ratio of the probe radius to the thickness of the viscous boundary layer. We demonstrate that the whole range of experimental data can be gathered in a master curve which is well reproduced by the model. This validates the use of these AFM modes for a quantitative study of nano-hydrodynamics, and opens the way to the investigation of other sources of dissipation in simple and complex fluids down to the nanometer scale.
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