期刊
BIOMEDICAL MICRODEVICES
卷 9, 期 6, 页码 833-843出版社
SPRINGER
DOI: 10.1007/s10544-007-9096-9
关键词
emulsification; choppers; hydrodynamic flow focusing; microdroplet; microfluidics; MEMS; collagen; alginate
The formation of micro-scale monodispersed emulsions is crucial for a variety of applications such as cosmetics, food industry and biotechnology. In this study, a new microfluidic chip with a multiple-channel layout for high-throughput emulsions is reported. This chip generated fine-tuned and uniform microdroplets in liquids with a higher throughput for emulsification applications. It employed a combination of multiple hydrodynamic flow focusing and liquid-cutting devices called active pneumatic choppers. Experimental data indicated that oil-in-water microdroplets with diameters ranging from 6 to 120 mu m can be successfully generated with a coefficient of variation less than 3.75%. The size of the droplets can be actively fine-tuned by using two approaches by adjusting relative sheath/sample flow velocity ratios and chopping frequency. Finally, two commonly used biocompatible materials, including collagen and calcium-alginate (Ca-alginate), were used to form microspheres by utilizing the liquid-cutting technique. The developed microfluidic chip is promising in various applications including biotechnology, nano-medicine and cosmetics.
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