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Digital Mechanical Metasurfaces for Reprogrammable Structural Display
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DOI：10.1021/acsnano.2c12679.png)
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摘要
En 中文
Stimuli-responsivesurfaces with reversible surface topographyand controllable physical and mechanical properties are highly desirablefor various engineering applications: e.g., information encoding,anticounterfeiting, micromanipulations, displays, etc. Here we presenta digital type of stimuli-responsive surface composed of discretesilicon scales supported on individual core-shell magneticmicropillars (MMP) and realize precise control over the local topographyof the surfaces. The individual MMP can be reversibly modulated betweentwo contrasting bending states (state 0, hard to bend; state 1, easyto bend) by controlling the spatial distribution of the magnetic nanoparticlesinside the pillar shells. These two different states of the micropillarsinduce a completely different topography of the supporting scalesthat can be utilized as mechanical pixels upon applying actuationmagnetic fields. We further build a three-dimensional (3D) microcontrollingplatform for digital modulation of the micropillar states. With thisplatform, a large array of 50 x 50 MMP surfaces can be programmedand reprogrammed into any combination of the local states by simplyreading a matrix of binary digits. Such a digital modulation processfacilitates the practical application of the MMP surfaces for fastand reprogrammable display of various structural patterns, as demonstratedfor microscale letters, millimeter-scale QR code, and complex Chinesecharacters. The digital modulation and on-demand reprogrammabilityof the MMP surfaces reported here are expected to advance the developmentof various other forms of digital mechanical metasurfaces that caneasily transform digital information into encoded mechanical responses.
Keyword:
stimuli-responsivemicrostructures
magnetic actuation
bending
digital encoding
surface engineering
期刊
IF:
16
论文数:
2.7W
被引数:
25.6W
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