在长时间尺度上与颗粒尺寸相关的微纳米颗粒的声泳运动和损耗
Particle-size-dependent acoustophoretic motion and depletion of micro- and nanoparticles at long time scales
摘要：
我们提出了三维测量的尺寸依赖的声泳运动的微粒直径从4.8微米到0.5微米悬浮在均匀或不均匀的流体内的玻璃-硅微通道和暴露于驻波超声波。为了研究交叉从辐射力为主的流动为主的运动作为颗粒尺寸的减小，我们扩展以前的研究，以长时间尺度，其中小于交叉尺寸的颗粒移动的距离可比的通道宽度。我们观察到的颗粒尺寸依赖的颗粒耗尽在晚些时候小于交叉尺寸的颗粒。在均匀流体中的这种耗尽背后的机制是合理的数值模拟，考虑到布朗运动。实验上，在不均匀的流体中的颗粒轨迹显示在早期集中在微通道的大部分，即使对于低于临界尺寸的颗粒，这清楚地表明了操纵亚微米颗粒的潜力。
英文摘要：
We present three-dimensional measurements of size-dependent acoustophoretic motion of microparticles with diameters from 4.8 um down to 0.5 um suspended in either homogeneous or inhomogeneous fluids inside a glass-silicon microchannel and exposed to a standing ultrasound wave. To study the cross-over from radiation force dominated to streaming dominated motion as the particle size is decreased, we extend previous studies to long time scales, where the particles smaller than the cross-over size move over distances comparable to the channel width. We observe a particle-size-dependent particle depletion at late times for the particles smaller than the cross-over size. The mechanisms behind this depletion in homogeneous fluids are rationalized by numerical simulations which take the Brownian motion into account. Experimentally, the particle trajectories in inhomogeneous fluids show focusing in the bulk of the microchannel at early times, even for the particles below the critical size, which clearly demonstrates the potential to manipulate submicrometer particles.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
