Fabrication Of Millimeters-Sized Poly(Divinylbenzene) Foam Shells From Controllable Double Emulsion In Microfluidic Device

A geometrically confined dripping was employed to enable precise control over the dimension and structure of millimeters-sized double-emulsion precursors of poly(divinylbenzene) foam shells in a new kind of double Y-shaped compound channels. Due to the 3D axial-symmetric microfluidic device, a more stable and robust flow field was maintained to obtain a continuous and regular emulsification. Various factors were systematically investigated for the precise size control of dripping in confined channel geometry, such as outlet channel size, fluid properties and flow rates. It was seen that phase properties and synergistic effects of main factors played key roles in determining droplet size. Thus, we used the optimized microfluidic approach to fabricate predetermined size foams to satisfy inertial fusion energy experiments, ranging from 4 to 4.6 mm in diameter with a 50-300 mu m wall thickness and a coefficient of variation < 0.5%. The results presented in this work provided a practical guideline for creating size-desired polymersome from comparable double emulsions.