Abstract
Two-particle colloids containing nanomagnets and microscale mirrors can be prepared fromiron oxide nanoparticles, microscale metal flakes and high-density liquids stabilizing themirror suspension against sedimentation by matching the constituent’s density. The freeBrownian rotation of the micromirrors can be magnetically controlled through ananisotropic change in impulse transport arising from impacts of the magnetic nanoparticlesonto the anisotropic flakes. The resulting rapid mirror orientation allows large changesin light transmission and switchable optical reflectivity. The preparation of apassive display was conceptually demonstrated through colloid confinement in aplanar cavity over an array of individually addressable solenoids and resulted in4 × 4 digit displays with a reaction time of less than 100 ms.
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