Department of Mechanical Engineering, Stanford University, Stanford, California 94305-3030, United States.
Langmuir. 2011 Mar 15;27(6):2142-5. doi: 10.1021/la1049452. Epub 2011 Feb 15.
A growing number of nanotechnologies involve rotating particles. Because the particles are normally close to a solid surface, hydrodynamic interaction may affect particle rotation. Here, we track probes composed of two particles tethered to a solid surface by a DNA molecule to measure for the first time the effect of a surface on the rotational viscous drag. We use a model that superimposes solutions of the Stokes equation in the presence of a wall to confirm and interpret our measurements. We show that the hydrodynamic interaction between the surface and the probe increases the rotational viscous drag and that the effect strongly depends on the geometry of the probe.
越来越多的纳米技术涉及到旋转粒子。由于粒子通常靠近固体表面，流体动力相互作用可能会影响粒子的旋转。在这里，我们跟踪由两个粒子组成的探针，这些探针通过 DNA 分子连接到固体表面，这是第一次测量表面对旋转粘性阻力的影响。我们使用一个模型，该模型在存在壁的情况下叠加了 Stokes 方程的解，以确认和解释我们的测量结果。我们表明，表面和探针之间的流体动力相互作用增加了旋转粘性阻力，并且该效果强烈依赖于探针的几何形状。
