Morimoto Hisao, Ukai Tomofumi, Nagaoka Yutaka, Grobert Nicole, Maekawa Toru
Bio-Nano Electronics Research Center, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Aug;78(2 Pt 1):021403. doi: 10.1103/PhysRevE.78.021403. Epub 2008 Aug 8.
We analyze the dynamics of paramagnetic particles on a paramagnetic substrate under a rotational magnetic field. When the paramagnetic particles are subjected to a rotational magnetic field, the rotational plane of which is perpendicular to the substrate surface, the particles form chain clusters caused by the dipole-dipole interaction between the particles and these clusters display a tumbling motion under certain conditions. In this case, the angular momentum of the clusters is converted to a translational one through the force of friction acting between the particles and substrate and, as a result, the clusters move along the surface of the substrate. We analyze the conditions under which the tumbling motion occurs and the dependence of the translational velocity of a cluster on the control parameters by the Stokesian dynamics method. Based on the dynamics of magnetic particles, we propose a method of manipulating nano- and microparticles using a rotational magnetic field. We demonstrate the manipulation of magnetic and nonmagnetic particles, a carbon nanotube, and a biological cell.
我们分析了在旋转磁场作用下顺磁性颗粒在顺磁性基底上的动力学行为。当顺磁性颗粒受到旋转磁场作用时，其旋转平面垂直于基底表面，颗粒会因颗粒间的偶极-偶极相互作用形成链状簇，并且这些簇在特定条件下会呈现翻滚运动。在这种情况下，簇的角动量通过颗粒与基底之间的摩擦力转化为平动动量，结果，簇沿着基底表面移动。我们通过斯托克斯动力学方法分析了翻滚运动发生的条件以及簇的平动速度对控制参数的依赖性。基于磁性颗粒的动力学，我们提出了一种利用旋转磁场操纵纳米和微米颗粒的方法。我们展示了对磁性和非磁性颗粒、碳纳米管以及生物细胞的操纵。
