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Dong Wu, Si-Zhu Wu, Shuai Zhao, Jia Yao, Jiang-Nan Wang, Qi-Dai Chen and Hong-Bo Sun Rapid, Controllable Fabrication of Regular Complex Microarchitectures by Capillary Assembly of Micropillars and Their Application in Selectively Trapping/Releasing Microparticles Small 9

Article first published online: 12 NOV 2012 | DOI: 10.1002/smll.201201689

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Strategies to realize controllable 3D microstructures and to reversibly trap and release microparticles are demonstrated. This technique controls the height, shape, width, and arrangement of the pillar arrays and realizes a series of microstructures by a combined top-down/bottom-up method. The fabricated ‘mechanical hand’-like 4-cell arrays are used to selectively trap/release microparticles with different sizes. Its underlying physical mechanism is attributed to the combined action of capillary, van der Waals, and swelling forces.

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