The Economist: A few years ago Yadong Yin was experimenting with tiny beads that changed color when a magnetic field was applied to them. This was interesting but there was no obvious way to turn them into a product
Now Yin and his colleagues at the University of California, Riverside, have come up with possible applications that range from a new type of paint to lipsticks and giant advertising billboards.Yin’s beads are magnetochromatic microspheres. They are made from tiny blobs of polymer that contain particles of iron oxide. The structure of these particles changes in a magnetic field in a way that produces “interference” colors when light is shone on them.It is the rearrangement of the particles’ microstructures that produces the pertinent detail.The new research appears in the 15 JuneJournal of the American Chemical Society.
