A high-throughput 3D microfluidic mixer in fused silica fabricated by femtosecond laser direct writingTuesday (23.06.2020) 11:30 - 11:50 Room 1
In this paper, we demonstrate a compact and efficient 3D micromixer based on the Baker’s transformation concept. Figure 1 schematically shows the design principle of the 3D microfluidic mixer. The device is composed of a string of mixing units categorized into two segments S1 and S2, as shown in Figure 1(a). The first segment (S1), as illustrated in Figure 1(b), is designed to increase the number of microstreams in the microchannel from N to 2N enabled by the Baker’s transformation. The second segment S2 consists of two twisted channels which relocates the microstreams in the left-handed region to the right-handed region and vice versa, as illustrated in Figure 1(c). Therefore, the functionality of S2 is to move the microstreams which are initially in close contact with the two sidewalls of the main microchannel at the entrance of S2 to the center of the microchannel at the exit of S2. The mixing efficiency can be effectively improved due to insert segments S2 to the microchannel. Our micromixer have been fabricated using ultrashort-pulsed laser assisted chemical etching of glass. The mixer is accommodated in a 1.6 cm-long channel with a rectangular cross-section of 1 mm 1 mm illustrated in Figure 1(d) and (e). The performance of the abricated 3D micromixers was examined using microfluidic mixing experiments. Two ink solutions with different colors (yellow and blue) were simultaneously injected into the micromixer from the two inlets. The mixing efficiencies at the outlet of the micromixers were tested with different flow rates, which were controlled using syringe pumps. The mixing process was monitored using a home-made microscope as shown in figure 2.
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