Three-dimensional ordered macroporous magnetic photonic crystal microspheres for enrichment and detection of mycotoxins (I): Droplet-based microfluidic self-assembly synthesis.

•Ordered macroporous magnetic silica photonic crystal microspheres were prepared.•Droplet-based flow microfluidic self-assembly method was employed to prepare the microspheres.•Particle size and content of the nanoparticles for self-assemble affect the microspheres quality.•The structural properties of the microspheres were characterized and studied.•The method overcomes the nanoparticles disordered self-assemble and the microspheres collapse.