报 告 人：荷蘭屯特大學 Claas Willem Visser 助理教授
邀 请 人：郗恒東教授
報告題目：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年在荷蘭屯特大學获博士学位，2016-2018年在美國哈佛大學做博士後，2018年至今任荷蘭屯特大學机械工程学院任助理教授，在Nature，Science Advances， Advanced Materials， Journal of Fluid Mechanics， Physical Review Fluids等權威期刊上發表論文三十余篇。