Illustration of the uCR-Chip and the test system. (IMAGE)
Caption
a Schematic illustration of the uCR-Chip showing the reagent inlet, sample inlet, observation window (OW), and outlet. The notation L and 5L indicate the channel length from the reagent inlet and the sample inlet channel, respectively, with a ratio of 1:5. The mixing channel originates from the intersection of the two flows, followed by the reaction channel before reaching the OW. b The COMSOL Multiphysics simulation of the flow mixing on the uCR-Chip. Rapid mixing is shown by the color gradient in the mixing channel followed by uniform color of the diluted concentration in the remaining reaction channel. Controlled mixing at 1:5 ratio is illustrated in the zoom-in figure. c Experimental testing of the mixing on the uCR-Chip using food color dyes. The rapid mixing is shown by quick transition to the green color. Controlled mixing at the 1:5 ratio is illustrated in the zoom-in figure. d Illustration of a USB microscope-based colorimetric signal reading system.
Credit
Microsystems & Nanoengineering
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License
CC BY