Speaker：Dr. Antoine Riaud
Topic：Micro-acoustofluidics: contactless manipulation of fluids and particles with ultrasounds
Location：Academic Hall on the third floor of the new No. 9 Teaching Building, School of Power and Mechanical Engineering, WHU
Time：10:00 a.m., Thursday, May 4th,2017
Organizer：School of Power and Mechanical Engineering, WHU
Welcome to attend the lecture!
About the speaker:
Antoine Riaud was born in 1989 in Toulouse, France. He received his M.Sc degree in industrial and chemical engineering conjointly from CentraleLille (France) and Tsinghua University (China). He earned his PhD degree in 2016 working at the Institut d’Electronique, Microelectronique et Nanotechnologies and Institut des Nanosciences de Paris. He is currently a postdoctoral researcher at the School of Medicine of Paris Sorbonne University. His research interests orbit around microfluidics and include Lattice-Boltzmann simulation methods, surface acoustic waves actuation of fluids and particles and quantitative biology. He has submitted 3 patents and already published 14 papers in various fields including control engineering, statistical physics, chemical engineering, acoustics and fluid mechanics.
The conversion of flow to sound, for instance in vent instruments and turbojet engines, is ubiquitous. Reversely, very powerful acoustic waves generate steady flows in fluids and steady forces on particles, a pair of phenomena readily observed in ultrasonic bath. Micro-acoustofluidics harnesses these nonlinear effects to manipulate tiny amounts of fluids and particles. I will present a new type of integrated transducer generating helicoidal ultrasonic waves. Thanks to the acoustic nonlinearities, the transducer can generate vorticity in situ and without contact, and is thus an interesting model for rheology and the study of eddies and swirls. When large enough particles are dispersed in the fluid, they experience a steady localized trapping force that allows capturing and patterning dozens of particles. Such technology is envisioned for an accurate positioning of cells in biophysical studies ad organ bioprinting.