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This paper presents the experimental results on the controlled transportation of a liquid droplet on dodecylbenzenesulfonate doped polypyrrole (PPy(DBS)) electrodes for ultra-low voltage digital microfluidics applications. The PPy(DBS) surface fabricated by the electropolymerization method exhibits a tunable wettability upon reduction and oxidation at low voltages (−0.9∼0.6V). By utilizing an asymmetric...
When a film bulk acoustic resonator (FBAR) is coupled to a thin liquid layer, the quality factor (Q) of the resonator varies in a damped oscillatory pattern versus the liquid thickness. This paper reports this behavior with an analytical modeling and experimental demonstration of it. The thin liquid layer with thickness comparable to the acoustic wavelength is realized by integrating a microfluidic...
The large depth of field of digital in-line holographic microscopy (DIHM) with numerical reconstruction provides an ideal tool for the study of microfluidic phenomena. As indicators of the flow patterns we use latex microspheres and also red blood cells whose three-dimensional trajectories and velocities can easily be measured as a function of time with subsecond and micron resolution. We demonstrate...
Microfluidic droplet systems have shown great promise in high throughput chemical assays to minimize chemical consumption and increase process efficiency. We report a droplet system that forms nanovolume drops under static conditions. The programmability of drop sizes is determined by geometric configurations and surface tension, and not particularly sensitive to flow rates. The geometry of the device...
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