Novel Design of Coaxial Capillary Microfluidic Devices for Robust Production of Multiple-Emulsion Droplets
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Emulsions have been utilized as templates to make microcapsules which encapsulate drugs, cosmetics, and foods. Emulsions with high uniformity in the size and functionality can be achieved by using glass capillary microfluidic devices. Conventionally, emulsion templates with thick middle phases and ultra-thin middle phases are made by using the counter-flow and co-flow system in microfluidic device, respectively. However, they require a complex chemical treatment process to make the devices, and limit the composition of emulsions depending on the miscibility of solutions.
In this work, we design and fabricate a novel coaxial capillary microfluidic device for production of emulsions with enhanced controllability. It dispenses with a complex chemical treatment and enables to control the size and thickness of emulsions easily. In addition, it minimizes the time that the interfaces of solutions contact each other, so the emulsions composed of two miscible solutions can be made as well.