Droplet microfluidics offer many advantages for microscale droplet generation and have great application potential in food emulsion processing. To employ novel technique to develop microfluidic chips, new devices based on a co-flow regime were fabricated by microscale 3D printing via projection microstereoscopic lithography and were applied to produce single emulsion and double emulsion . The results showed that monodisperse water-in-oil (W/O) and oil-in-water (O/W) single emulsion could be produced in the same device with a coefficient of variation (CV) less than 3%. The parallelized microfluidic device has 5 droplet generators and can generate different types of single emulsions with a CV of approximately 3%. Furthermore, double emulsion droplets could be produced without surface treatment. The development of micro 3D printing provides a new way of microfluidics emulsion formation in food, especially for double emulsion formation, which has the great advantage of no surface treatment. These devices provide considerable support for further commercial application of droplet microfluidics.
In this work, we describe a straightforward approach to produce monodisperse Janus and core-shell particles by using organic solvent free single emulsion droplet-based microfluidic device combining with off-chip polymerization. To accomplish this, methyl methacrylate (MMA) was used as both the oil phase and solvent to dissolve a polymerizable PEGbased macromolecular surfactant, instead of traditional surfactant, and the photo-initiator. Janus particles can be easily obtained by off-chip UV polymerization due to polymerization induced phase separation between PEG and the formed poly(methyl methacrylate). At the same time, core-shell particles can also be easily attained by inverting the original collecting tube several times and then exposing to UV light. These results may extend the scope of microfluidic technology and the studies on polymerization induced self-assembly/phase-separation into easy fabrication of various new functional materials.
危险品化学品经营许可证（带存储）