High quality dual-functionalized microspheres recently
became available on the market in bulk quantities and reasonable prices
from Cospheric LLC. There are numerous applications for this amazing
product, with most of them still waiting to be discovered.
One particularly interesting and unique feature of these miracle
microspheres is their ability to orient themselves in response to
electromagnetic field and show a visual response. This is achieved by
making spheres both bipolar and bichromal,
with dipole precisely aligned with two differently colored hemispheres.
Due to the dipole the sphere will rotate in electromagnetic field to
align more positive hemisphere to the negatively charged stimuli and
vise versa. As the spheres align themselves, the viewer will observe
the color of one hemisphere, while the other hemisphere will be hidden
from view, providing an obvious strong visible indication of the
presence of the field. In alternating electromagnetic field, these
microspheres can spin at hundreds of times per second.
superior functionality is achieved with proprietary and patented
process that allows extremely precise coating on one hemisphere without
affecting the other. Each coating is custom formulated for color,
charge, magnetic, electric, and surface properties, and solvent
resistance per customers’ needs. Hemispherical coatings of less than 1
micron with tolerances as low as 0.25 micron have been routinely
demonstrated. Color combinations are truly unlimited. White, black,
silver, blue, green, red, yellow, brown, purple as well as transparent
microspheres have been made. Sphericity of greater than 90% and custom
particle size ranges are offered.
spheres were originally developed for very high tolerance electronic
digital displays where functionalized microspheres are used to create an
image that appears to the viewer. To achieve high resolution in display
applications it is critical that every single sphere responds to
electromagnetic field in the same way at the same time and aligns
precisely with the other spheres. It is also critical that there are no
color gradients in the display.