Preparation of Uniform Microspheres Using a Simple Fluidic Device and Their Crystallization into Close‐Packed Lattices

Uniform microspheres using a fluidic device: A simple fluidic device is demonstrated to produce uniform microspheres with sizes ranging from 30 to 250 µm (see image). A tapping method with a concave glass is also developed to crystallize these microspheres into close-packed lattices. These techniques provide a powerful strategy for the scalable and continuous production of microspheres, as well as their crystalline lattices.