Magnetic Actuation Multi-functional Platform Combining Microdroplets Delivery and Stirring

2019 
Multi-functional droplets manipulation devices are in urgent need for various laboratory operations such as chemical reaction and biological analysis. However, most of current techniques that achieved controllable droplet transport system mainly rely on passive diffusion for mixing, limiting their practical applications. Here, we develop a magnetic controlled dimple on slippery surface (MCDSS) that enables arbitrary direction or even uphill droplet transport through the synergy between gravitational force and asymmetrical droplet deformation. Further experiments demonstrate that our system could also be used for stirring microdroplets and accelerate the mixing speed by more than one hundred times. In addition, the micro-stir strategy could help to avoid locally uneven production of precipitation or gas in heterogeneous reactions. This combination of droplet delivery and agitation may have a promising future for application in various fields, for example, laboratory-on-a-chip platforms and microengines.
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