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- W1738546521 abstract "Optically‐based lab‐on‐a‐chip systems have the distinct advantage of being dynamically controlled in real time, providing reconfigurable operations that can be tuned to perform a variety of tasks. This manuscript demonstrates the concentration of liquid‐suspended microparticles using a focused near‐infrared laser (980 nm) and a parallel‐plate electrode system. The parallel‐plate electrodes consisted of an indium tin oxide‐coated coverslip and a gold‐coated glass substrate. When the laser was applied at 36 mW, the indium tin oxide surface is locally heated creating sharp temperature gradients on the order of 0.07 o C/μm. When an AC field was applied, electrothermal hydrodynamic forces generated microfluidic vortices. At an AC frequency of 40 kHz, the optically controlled electro‐hydrodynamics aggregated colloids at the center of fluid motion on the surface of the indium tin oxide coverslip. The nature of colloid aggregation, translation, and patterning was explored when the translational velocity of the laser spot was varied. This manuscript describes the design of the laser scanning system using commercially available components and the fabrication of the parallel‐plate chip. The effect that the laser scanning rate has on the heat transfer, fluid velocity, and colloid aggregation is discussed." @default.
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- W1738546521 date "2012-07-01" @default.
- W1738546521 modified "2023-09-27" @default.
- W1738546521 title "Electrokinetic concentration and patterning of colloids with a scanning laser" @default.
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- W1738546521 doi "https://doi.org/10.1002/elps.201100676" @default.
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