Romodina Maria N, Lyubin Evgeny V, Fedyanin Andrey A
Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia.
Sci Rep. 2016 Feb 15;6:21212. doi: 10.1038/srep21212.
Thermal fluctuations significantly affect the behavior of microscale systems rotating in shear flow, such as microvortexes, microbubbles, rotating micromotors, microactuators and other elements of lab-on-a-chip devices. The influence of Brownian torque on the motion of individual magnetic microparticles in a rotating magnetic field is experimentally determined using optical tweezers. Rotational Brownian motion induces the flattening of the breakdown transition between the synchronous and asynchronous modes of microparticle rotation. The experimental findings regarding microparticle rotation in the presence of Brownian torque are compared with the results of numerical Brownian dynamics simulations.
热涨落显著影响在剪切流中旋转的微尺度系统的行为，如微涡旋、微气泡、旋转微电机、微致动器以及芯片实验室设备的其他元件。利用光镊通过实验确定了布朗转矩对旋转磁场中单个磁性微粒运动的影响。旋转布朗运动会导致微粒旋转同步和异步模式之间的击穿转变变得平缓。将存在布朗转矩时微粒旋转的实验结果与数值布朗动力学模拟结果进行了比较。
