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Published on: November 10, 2014
Non-Electrode Droplet Manipulation via Triboelectrification Near-Field Energy Transmission
Jun Han1, Ruxue Huang1, Chuncai Shan1
1Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, P. R. China.
Abstract:
Droplet manipulation technology plays a crucial role in academic research and engineering applications. However, current manipulation technology requires integrated circuits and electrode configurations, which introduce the risk of short circuits and droplet cross-contamination during operation. Herein, we developed an omnidirectional wireless electro-droplet manipulation system (WEDMS) without using electrode/circuit control that obviates droplet cross-contamination to precisely manipulate droplet movement in separated or isolated space. This system innovatively generates localized electric fields through the synergistic effects of dielectric polarization and air discharge, achieving a noncontact, electrode-free droplet charging and driving strategy. It achieves synchronous movement of the slider and droplets via hand movement, enhancing droplet operation flexibility and human-droplet interaction on triboelectric nanogenerators. Moreover, WEDMS is capable of manipulation droplets with high speed across a wide range of volumes (10 to 2,000 μl) and effective control of droplets in both gas and oil phases, achieving a series of manipulations such as droplet positioning, chemical reactions, flexible steering, and droplet climbing, showcasing an innovative, efficient, portable, and comprehensive droplet manipulation strategy. Based on the prominent advantages of WEDMS in structural simplicity and high-efficiency control, its adaptability in multidisciplinary microfluidic applications can be further enhanced, demonstrating tremendous potential in drug delivery, green chemical synthesis, and environmental monitoring.
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