Suspension printing of liquid metal in yield-stress fluid for resilient 3D constructs with electromagnetic functions  

作　　者：Qian Wu Fengbo Zhu Ziliang Wu Yu Xie Jin Qian Jun Yin Huayong Yang 

机构地区：[1]The State Key Laboratory of Fluid Power and Mechatronic Systems,School of Mechanical Engineering,Zhejiang University,Hangzhou 310028,China [2]Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province,School of Mechanical Engineering,Zhejiang University,Hangzhou 310028,China [3]College of Materials Science&Engineering,Taiyuan University of Technology,Taiyuan 030024,China [4]MOE Key Laboratory of Macromolecular Synthesis and Functionalization,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,China [5]Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province,Department of Engineering Mechanics,Zhejiang University,Hangzhou 310027,China

出　　处：《npj Flexible Electronics》2022年第1期507-517,共11页npj-柔性电子（英文）

基　　金：support provided by the National Key Research and Development Program of China (Grant No.2018YFA0703000);the National Natural Science Foundation of China (Grant Nos.52075482,12125205,12072316,and 51973189);the Starry Night Science Fund of Zhejiang University Shanghai Institute for Advanced Study (Grant No.SN-ZJU-SIAS-004).

摘　　要：Liquid metal is an ideal conductive material for soft electronics because of its high conductivity and fluidity at room temperature.However,the large surface tension and high mass density of liquid metal make forming three-dimensional(3D)dangling structures a challenging task.Reported here is a suspension printing strategy for direct deposition of galinstan-based liquid metal into 3D dangling structures with high shape fidelity and spatial resolution(~150μm).Acrylamide/nanoclay suspension served as a yieldstress fluid support bath,with selected hydrogen peroxide to immediately oxidize the gallium skin and strengthen the extruded liquid metal,thus continuous liquid metal filaments were deposited successfully.The subsequent photo-curing of acrylamide/nanoclay works as a resilient outer packaging,giving rise to a~500%tensile deformation for liquid metal-hydrogel composite.This suspension printing strategy should broaden the opportunity of using 3D and functional liquid metal constructs for soft yet resilient electromagnetic devices.

关 键 词：stress deformation liquid 

分 类 号：TG14[一般工业技术—材料科学与工程]