Abstract
(April 21, 2015) In
this work, we describe the synthesis of novel electrically and magnetically
dual-driven Janus particles for a handwriting-enabled twisting ball display via
the microfluidic technique. One hemisphere of the Janus particles contains a
charge control agent, which allows the display color to be controlled by
applying a voltage and superparamagnetic nanoparticles, allows handwriting by
applying a magnetic field to the display. We fabricated a twisting ball display
utilizing these Janus particles and tested the electric color control and
handwriting using a magnet. As a result, the display was capable of permitting
handwriting with a small magnet in addition to conventional color control using
an applied voltage (80 V). Handwriting performance was improved by increasing
the concentration of superparamagnetic nanoparticles and was determined to be
possible even when 80 V was applied across the electrodes for 4 wt. %
superparamagnetic nanoparticles in one hemisphere.