Versatile Bifunctional Magnetic‐Fluorescent Responsive Janus Supraballs Towards the Flexible Bead Display

The first microfluidic synthesis of ionomer-based bifunctional Janus supraballs possessing two distinct magnetic-nanoparticle-dropped and quantum dots–polymer hemispheres within an anisotropic structure is reported. Based on such Janus supraballs with stable fluorescence and superparamagnetism, a magnetoresponsive fluorescent switch is developed to realize free-writing under a magnetic field. This is a promising, simple way to fabricate novel flexible bead displays. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.