报 告 人：荷兰屯特大学 Claas Willem Visser 助理教授
邀 请 人：郗恒东教授
报告题目：3D printing of architected polymer foams via direct bubble writing
Polymer foams are cellular solids composed of solid and gas phases that are widely used as personal protection gear, pressure sensors, thermal insulation, acoustic materials, and scaffolds for artificial tissues. Their mechanical, thermal, and acoustic properties are determined by the respective composition, volume fraction and connectivity of both phases. Therefore, controlling their local architecture is hardly possible with current techniques, since bulk techniques lack control and microfluidic techniques lack the options to create foams with internal gradients. Here we introduce direct bubble writing, a technique for additive manufacturing of locally tunable polymer foams. By ejecting bubbles into the air, depositing them onto a substrate, and polymerizing them in-situ with UV light, open- and closed-cell foams with locally graded densities were printed into programmable macroscopic shapes at throughputs >10 mL min-1. We fabricated graded polymer foams in several motifs, including 3D lattices, shells, and out-of-plane pillars. Through the incorporation of silver nanoparticles, we produced conductive composite foams with controlled stiffness for use as soft pressure sensors. Direct bubble writing opens new avenues for rapidly designing and manufacturing designer polymer foams on demand.
Claas Willem Visser于2015年在荷兰屯特大学获博士学位，2016-2018年在美国哈佛大学做博士后，2018年至今任荷兰屯特大学机械工程学院任助理教授，在Nature，Science Advances， Advanced Materials， Journal of Fluid Mechanics， Physical Review Fluids等权威期刊上发表论文三十余篇。