报告题目:Fluid mechanics for Functional Materials
报 告 人：Claas Willem Visser （荷兰特文特大学，机械工程学院）
主 持 人：郗恒东 教授
时 间：2018年10月23日 星期二9：00-10:00
地 点：西北工业大学 友谊校区 航空楼A座706
A key physical challenge in additive manufacturing is that the deposited material needs to flow in order to be transported to the work piece, but requires a solid phased to retain its shape. Several strategies have been developed to resolve this paradox, including localized heating of the ink with a nozzle (as in fused filament deposition), direct-write of shear-thinning inks, and localized melting or gluing of powder beds. I will discuss another strategy: Rapid solidification of low-viscosity droplets, which enables rapid fabrication in almost arbitrary shapes including closed architectures. The focus will be on two examples:
(1) Laser-induced forward transfer of metals, which enables direct-write of functional 3D metal microdevices.
(2) In-air microfluidics, which enable high-throughput fabrication of particles that are subsequently stacked into multi-scale (bio)materials.
Claas Willem Visser received his MSc degree in Applied Physics from the University of Twente in 2006. From 2006 to 2011, he worked at Tata Steel Research, Development, and Technology as a researcher and project leader. Then he pursued his Ph.D. (2011-2015) in the Physics of Fluids group at the University of Twente. After that, he worked as a Rubicon Post-Doctoral Fellow at the Harvard John A. Paulson School of Engineering and the Wyss Institute for Biologically Inspired Engineering (2016-2018).
Dr. Visser is now an assistant professor at the Faculty of Mechanical Engineering of the University of Twente. His lab aims at developing multi-scale functional materials by using fluid droplets or bubbles to optimize the mechanical, acoustic, electrical, and biological properties for various applications. So far, he has published more than 20 journal articles, including Science Advances, Small, Soft Matter and so on. In particular, a new technology for particle fabrication and 3D printing named "In-air microfluidics" co-developed by Dr. Visser, has been commercialized in the company IamFluidics, of which he is co-founder and chief scientific officer.