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Title: Light Enabled Droplet Manipulations
Authors: Chuang, Han-Sheng
Kumar, Aloke
Wereley, Steven
Keywords: Optoelectrowetting
Digital Microfluidics
Programmable Lab on a Chip
Issue Date: 16-Oct-2009
Abstract: This fluid dynamics video showcases how optically induced electrowetting can be used to manipulate liquid droplets in open space and particulate phases inside the droplet. A photoconductive layer is added to a conventional electrowetting-on-dielectric (EWOD) structure to generate light enabled virtual electrodes, hence resulting in an eletrowetting action. Coplanar electrodes deployed alternately on a substrate enable open droplet manipulations differentiating from a sandwiched configuration. An integration with an optoelectric method shows dynamic and rapid particle handling by strong micro fluidic vortices in conjunction with other electrokinetic forces inside a droplet. The droplet manipulations are realized with visible illumination and powered at 150 volts peat-to-peak with a low frequency (100 Hz-800 Hz). The particle concentration is achieved on the surface of the same chip but illuminated with a near-infrared (1064 nm) light source and biased with a high frequency (24 kHz) AC signal.
Appears in Collections:Fluid Dynamics Videos

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File Description SizeFormat
O-OEW_movie_MPEGII.mpgOpen Optoelectrowetting Droplet Manipulations & Particle Concentration49.98 MBMPEGView/Open
O-OEW_movie_MPEGI.mpgOpen Optoelectrowetting Droplet Manipulations & Particle Concentration25.51 MBMPEGView/Open

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