Shape-Programmed Fabrication and Actuation of Magnetically Active Micropost Arrays

ACS Applied Materials & Interfaces
Jisoo JeonJeong Jae Wie

Abstract

Micro- and nanotextured surfaces with reconfigurable textures can enable advancements in control of wetting and heat transfer, directed assembly of complex materials, and reconfigurable optics, among many applications. However, reliable and programmable directional shape change in large scale is significant for prescribed applications. Herein, we demonstrate the self-directed fabrication and actuation of large-area elastomer micropillar arrays, using magnetic fields to both program a shape-directed actuation response, and to rapidly and reversibly actuate the arrays. Specifically, alignment of magnetic nanoparticles during casting of microposts arrays with hemicylindrical shapes imparts a deterministic anisotropy that can be exploited to achieve prescribed, large-deformation bending or twisting of the pillars. The actuation coincides with finite element method, and we demonstrate reversible, non-contact magnetic actuation of arrays of tens of thousands pillars over hundreds of cycles with bending and twisting angles of up to 72° and 61°, respectively. Moreover, we demonstrate use of the surfaces to control anisotropic liquid spreading, and show that capillary self-assembly of actuated micropost arrays enables highly complex arc...Continue Reading

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Citations

Feb 23, 2021·ACS Nano·Ke NiZhengzhi Wang
Feb 11, 2021·Nanotechnology·Zhiren LuoChih-Hao Chang
Mar 11, 2021·ACS Applied Materials & Interfaces·Li DingDongsheng Zhang
Apr 10, 2021·Multifunctional Materials·Shuai WuRuike Zhao
Apr 23, 2021·ACS Applied Materials & Interfaces·Shuaizhong ZhangJaap den Toonder

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