CNR-IPCF UOS Roma c/o Dipartimento di Fisica, Università di Roma Sapienza, 00185 Rome, Italy.
Phys Rev Lett. 2013 Apr 26;110(17):174103. doi: 10.1103/PhysRevLett.110.174103.
Hydrodynamic synchronization provides a general mechanism for the spontaneous emergence of coherent beating states in independently driven mesoscopic oscillators. A complete physical picture of those phenomena is of definite importance to the understanding of biological cooperative motions of cilia and flagella. Moreover, it can potentially suggest novel routes to exploit synchronization in technological applications of soft matter. We demonstrate that driving colloidal particles in rotating energy landscapes results in a strong tendency towards synchronization, favoring states where all beads rotate in phase. The resulting dynamics can be described in terms of activated jumps with transition rates that are strongly affected by hydrodynamics leading to an increased probability and lifetime of the synchronous states. Using holographic optical tweezers we quantitatively verify our predictions in a variety of spatial configurations of rotors.
流体动力同步为在独立驱动的介观振荡器中自发出现相干拍频状态提供了一种通用机制。这些现象的完整物理图像对于理解纤毛和鞭毛的生物协同运动具有重要意义。此外，它还有可能为软物质技术应用中的同步提供新的途径。我们证明，在旋转的能量景观中驱动胶体颗粒会导致强烈的同步趋势，有利于所有珠子同相旋转的状态。由此产生的动力学可以用激活跳跃来描述，其跃迁率受流体动力学的强烈影响，从而增加了同步状态的概率和寿命。我们使用全息光镊在各种转子的空间配置中定量验证了我们的预测。
