Rapid magnetic wiper featuring biogenic guanine particles: Magnetic non-contact switching of opto-fluidic mirrors featuring biogenic guanine crystals

In the present study, we prepared a diamagnetic fluid with magnetically controlled visual transparency. Light scattering control by the magnetic orientation of organic and diamagnetic microcrystals was applied for developing a functional diamagnetic fluid, by controlling its turbidity and transparency. The light scattering fluid was prepared by guanine crystal particles suspension (GPS), which were collected from the scales of goldfish, in an aqueous solution. It is revealed that GPS can control light scattering with magnetic fields. The method we developed can be utilized for controlling the visibility of light-reflective objects by using magnetic fields on a millitesla scale. (C) 2014 AIP Publishing LLC.