Abstract
We propose microfluidic modules as connectable platforms to form coaxial microfluidic devices for formation of monodisperse droplets and hydrogel fibers according to the intended use (Fig. 1). By integration of the microfluidic modules, we succeeded in preparation of variable designed coaxial microfluidic devices: axisymmetric flow-focusing device (AFFD) and coaxial laminar-flow device (CLFD). Using the AFFD and the CLFD, we achieved formation of monodisperse water-in-oil (W/O) and W/O/W droplets and multiple layered hydrogel fibers including cell-laden microfibers, respectively. Therefore, we believe that the microfluidic modules will be useful tools for researchers in various fields in biology and chemistry to prepare coaxial microfluidic devices without manufacturing techniques of coaxial microfluidic devices.
