Miniaturized magnetic stir bars for controlled agitation of aqueous microdroplets

摘要

Suspension of Fe O nanoparticles ( ) at the beginning and ( ) at the end of the ligand exchange process. ( ) Alignment and synthesis of MNBs was performed in a custom-made holder with a neodymium magnet next to the vial. ( ) Representative electron micrographs of individual MNBs (white scale bars indicate the stated lengths). ( ) Length distribution, , obtained from seven different batches. Beyond a peak around m a roughly exponential decay is observed (ensemble mean: m).