光磁操纵微球在玻璃-水界面上的滑动摩擦
Slipping friction of an optically and magnetically manipulated microsphere rolling at a glass-water interface
摘要：
利用磁旋转光镊结合明场显微粒子跟踪技术研究了浸没式磁性微球在玻璃-水界面上的滚动运动。将不同表面粗糙度的单个微球磁性旋转进出光阱以诱导滚动，沿着普通玻璃盖玻片或用聚乙二醇官能化的玻璃盖玻片。结果表明，微球在磁场作用下表现出非线性的动态滚动滑动运动，其运动特征表现为两个区域：在低转速下，微球沿表面自由滚动的速度与磁转速成正比增加;但是，在此情况下，旋转频率的进一步增加超过某一阈值揭示了向运动的急剧转变，在该运动中微球相对于外部磁场导致轧制速度降低。表面微球相互作用的位置上的阈值频率的影响提出和调查。类似的实验中，微球滚动，同时在光阱中滑动，结果一致。
英文摘要：
The motion of submerged magnetic microspheres rolling at a glass-water interface has been studied using magnetic rotation and optical tweezers combined with bright-field microscopy particle tracking techniques. Individual microspheres of varying surface roughness were magnetically rotated both in and out of an optical trap to induce rolling, along either plain glass cover slides or glass cover slides functionalized with polyethylene glycol. It has been observed that the manipulated microspheres exhibited nonlinear dynamic rolling-while-slipping motion characterized by two motional regimes: At low rotational frequencies, the speed of microspheres free-rolling along the surface increased proportionately with magnetic rotation rate; however, a further increase in the rotation frequency beyond a certain threshold revealed a sharp transition to a motion in which the microspheres slipped with respect to the external magnetic field resulting in decreased rolling speeds. The effects of surface-microsphere interactions on the position of this threshold frequency are posed and investigated. Similar experiments with microspheres rolling while slipping in an optical trap showed congruent results.
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