Journal
NANO LETTERS
Volume 20, Issue 10, Pages 7519-7529Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02997
Keywords
three-dimensional transport; liquid manipulation; magnetically responsive structure; rapid propulsion; femtosecond laser
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Funding
- National Natural Science Foundation of China [51875544, 51675503, 51805509]
- Fundamental Research Funds for the Central Universities [WK2090000013, WK2090090021, WK2090090024, WK2090090025, WK6030000131]
- Youth Innovation Promotion Association CAS [2017495]
- Foundation of Equipment Development Department [6220914010901]
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Nature-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 (similar to 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.
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