汇报题目：参加AcoustoFluidics 2019 参会报告

汇报时间：2019年9月25日(星期三) 16:00

汇报地点：科技园西五楼北A302会议室

汇报人：江蕾

会议名称：AcoustoFluidics 2019

会议时间：25-28 August 2019

会议地点：Enschede, Netherlands

会议简介：This annual meeting was held in University of Twente, Netherlands in 2019, sponsored by the Chemical and Biological Microsystems Society (CBMS). This focused meeting is dedicated to exploring the science, engineering, and use of ‘micro- to nanoscale acoustofluidics. In particular the scope of the conference covers:

（1）Liquids, bubbles, particles and cells manipulation with acoustics;

（2）Integrated acoustofluidics devices for energy, chemical, biological, and medical applications;

（3）Fluid interface manipulation using ultrasound, including atomization, droplet generation, and thin films;

（4）Transducers designs for micro/nano acoustofluidics, including new fabrication methods and ideas;

（5）Acoustical tweezers and acoustophoresis;

（6）Acoustic streaming and radiation pressure analysis and experimentation.

会议交流工作

Oral presentation: Characterization of Acoustic Streaming and its potential suppression in aluminum-PDMS acoustofluidic chips

报告人：江蕾

参加论文信息

Title: Characterization of Acoustic Streaming and its potential suppression in aluminum-PDMS acoustofluidic chips

Author: Lei Jiang, Wei Qiu, William N. Bodé, Niancai Peng, Andreas Lenshof, Henrik Bruus, and Thomas Laurell

Abstract: Boundary-driven Rayleigh streaming and acoustic radiation forces jointly and competitively influence the particle trajectory in acoustophoretic devices. However, in the conventional hard-walled silicon-glass microchip, the Rayleigh streaming results from dissipation in the boundary layers and negatively affects the focusing of submicro- and nano-scale particles. It would be a significant improvement if the streaming could be suppressed by changing the boundary conditions. Few researchers tried to break the confines of traditional materials in bulk acoustic wave (BAW)-based devices and there was no further analysis related to the streaming field or the acoustic radiation force field. Our study herein demonstrates both by numerical analysis and experiments that hard-walled acoustophoresis devices, with a PDMS film as the microchannel top cover, display significantly altered Rayleigh streaming roll configurations as compared to traditional hard-walled devices. It was also found that the radiation force field in this case comprises a vertical component. Furthermore, we predict that the boundary driven streaming can be fully suppressed by having soft boundaries both in the channel top and bottom. Our results open up the possibility of using cheap and easily manufactured acoustofluidic chips to manipulate submicrometer and nanometer particles.

Hope to see you there!