It was announced today a team of top researchers at the University of California, Riverside has been able to fabricate microscopic polymer beads that can change colors instantly with the application of an external magnetic field. The most interesting aspect of the color changing properties of the polymer beads is that the color change can be reversed. The beads are being looked at closely for use in displays to make rewritable signage, posters, paper, and labels. The material could also be used to make magnetically activated security features and environmentally friendly pigments for paint and cosmetics.
The beads are technically magnetochromatic microspheres and have excellent structural stability according to the researchers. The microspheres are also very compatible with multiple types of dispersion media including water, alcohol, hexane, and polymer solutions. This allows the beads to retain their ability to be magnetically tunable in color when dispersed inside a variety of chemicals.
The color change of the microspheres is accomplished by simply changing the orientation of the particles. The microspheres themselves are created by mixing magnetic iron oxide particles into a resin that starts as a liquid and hardens with exposure to ultraviolet radiation.
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