A microfluidic spiral for size-dependent fractionation of magnetic microspheres

► A chip for continuous size fractionation of magnetic microspheres was developed. ► Fractionation bases on Dean effect and is not influenced by magnetic agglomeration. ► A bimodal particle mix can be separated into its components. ► Broad distributed samples can be classified in fractions of different size. ► Enrichment of particles from highly diluted dispersion can be performed.