Enhancement of Magneto‐Mechanical Actuation of Micropillar Arrays by Anisotropic Stress Distribution

Park, Jeong Eun; Jeon, Jisoo; Park, Sei Jin; Won, Sukyoung; Ku, Zahyun; Wie, Jeong Jae

doi:10.1002/smll.202003179

Enhancement of Magneto‐Mechanical Actuation of Micropillar Arrays by Anisotropic Stress Distribution

Journal Article · Thu Aug 13 00:00:00 EDT 2020 · Small

DOI:https://doi.org/10.1002/smll.202003179· OSTI ID:1647505

Park, Jeong Eun ^[1]; Jeon, Jisoo ^[1]; Park, Sei Jin ^[2]; Won, Sukyoung ^[1]; Ku, Zahyun ^[3]; ^[1]

Department of Polymer Science and Engineering Inha University Incheon 22212 Republic of Korea
Physical and Life Sciences Directorate Lawrence Livermore National Laboratory Livermore CA 944550 USA
Materials and Manufacturing Directorate Air Force Research Laboratory Wright Patterson Air Force Base Dayton OH 45433 USA

Abstract

Magnetically active shape‐reconfigurable microarrays undergo programmed actuation according to the arrangement of magnetic dipoles within the structures, achieving complex twisting and bending deformations. Cylindrical micropillars have been widely used to date, whose circular cross‐sections lead to identical actuation regardless of the actuating direction. In this study, micropillars with triangular or rectangular cross‐sections are designed and fabricated to introduce preferential actuation directions and explore the limits of their actuation. Using such structures, controlled liquid wetting is demonstrated on micropillar surfaces. Liquid droplets pinned on magnetic micropillar arrays undergo directional spreading when the pillars are actuated as depinning of the droplets is enabled only in certain directions. The enhanced deformation due to direction dependent magneto‐mechanical actuation suggests that micropillar arrays can be fundamentally tailored to possess application specific responses and opens up opportunities to exploit more complex designs such as micropillars with polygonal cross sections. Such tunable wetting of liquids on microarray surfaces has potential to improve printing technologies via contactless reconfiguration of stamp geometry by magnetic field manipulation.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1647505

Journal Information:: Small, Journal Name: Small Journal Issue: 38 Vol. 16; ISSN 1613-6810

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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