Reigh Shang Yik, Kapral Raymond
Chemical Physics Theory Group, Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada.
Soft Matter. 2015 Apr 28;11(16):3149-58. doi: 10.1039/c4sm02857k.
Synthetic chemically-powered motors with various geometries have potentially new applications involving dynamics on very small scales. Self-generated concentration and fluid flow fields, which depend on geometry, play essential roles in motor dynamics. Sphere-dimer motors, comprising linked catalytic and noncatalytic spheres, display more complex versions of such fields, compared to the often-studied spherical Janus motors. By making use of analytical continuum theory and particle-based simulations we determine the concentration fields, and both the complex structure of the near-field and point-force dipole nature of the far-field behavior of the solvent velocity field that are important for studies of collective motor motion. We derive the dependence of motor velocity on geometric factors such as sphere size and dimer bond length and, thus, show how to construct motors with specific characteristics.
具有各种几何形状的合成化学动力马达在涉及非常小尺度动力学方面具有潜在的新应用。依赖于几何形状的自生浓度和流体流场在马达动力学中起着至关重要的作用。与经常研究的球形雅努斯马达相比，由相连的催化和非催化球体组成的球形二聚体马达展示了更复杂版本的此类场。通过利用解析连续介质理论和基于粒子的模拟，我们确定了浓度场，以及对于集体马达运动研究很重要的近场复杂结构和溶剂速度场远场行为的点力偶极性质。我们推导了马达速度对诸如球体大小和二聚体键长等几何因素的依赖性，从而展示了如何构建具有特定特性的马达。
