nl0c02997_si_013.avi (2.83 MB)
Three-Dimensional Multifunctional Magnetically Responsive Liquid Manipulator Fabricated by Femtosecond Laser Writing and Soft Transfer
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posted on 2020-09-17, 18:12 authored by Shaojun Jiang, Yanlei Hu, Hao Wu, Rui Li, Yiyuan Zhang, Chao Chen, Cheng Xue, Bing Xu, Wulin Zhu, Jiawen Li, Dong Wu, Jiaru ChuNature-inspired
magnetically responsive intelligent topography
surfaces have attracted considerable attention owing to their controllable
droplet manipulation abilities. However, it is still challenging for
magnetically responsive surfaces to realize three-dimensional (3D)
droplet/multidroplet transport in both horizontal and vertical directions.
Additionally, the droplet horizontal propulsion speed needs to be
improved. In this work, a 3D droplet/multidroplet transport strategy
based on magnetically responsive microplates array (MMA) actuated
by a spatially varying and periodic magnetic field is proposed. The
modified superhydrophobic surface can transport droplets rapidly both
in horizontal and vertical directions, and it can even realize against-gravity
upslope propulsion. The rapid horizontal droplet propulsion (∼58.6
mm/s) is ascribed to the abrupt inversion of the modified surface
induced by the specific magnetic field. Furthermore, the nonmagnetically
responsive microplates (NMMs)/MMA composite surface is constructed
to realize 3D multidroplet manipulation. The implementations of MMA
in manipulation of continuous fluids and liquid metal are further
demonstrated, providing a valuable platform for microfluidic applications.