Fabrication of Janus hydrogel beads with magnetic anisotropy for electronic paper using shrinkage-gelation technique

We develop a novel technique for fabricating monodisperse Janus hydrogel beads with magnetic anisotropy smaller than the microchannel based on coagulation of Fe₃O₄ nanoparticles and shrinkage-gelation technique. This technique can avoid the problem of limits to the minimum biphasic droplet size due to the high risk of clogging, and the problem of a blurring boundary on fabricated Janus particles by convective mixing across the interface inside the biphasic droplets. Therefore, this technique has potential for the further development of electronic paper.