Half-Coated Spheres - Half-Shells - Hemispherical Coatings on Microspheres - Partial Coatings of MicroparticlesCospheric offers unique capability to manufacture Janus microspheres and microparticles with partial coatings and dual functionality.
Currently half-shell or hemispherical coatings can be applied to any sphere
(glass, polymer, ceramic) in sizes 45micron in diameter and higher. Coatings can be customized for any color and coverage of
between 20% to 50% of the sphere. 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.
The custom coating capability offers customers the ability to create fluorescent glass micro-spheres of the specific size and emission/excitation needed. As the micro spheres and coating are solvent resistant they work ideally as fluorescent tracers or highly visible targets.
We can overcoat clear glass or silver coated glass for the effect
needed. For those needing very large Spheres Cospheric can coat spheres of 1mm and larger. Janus microparticles are now available as either dry powder or in a diellectric oil.
More information on Bichromal Janus Particles:Named after two-faced Roman god who looks to both the future and the past, Janus particles are microscopic particles
composed of two different regions. The two sides can vary in color, optical properties, surface tension, electrostatic charge, magnetic response, conductivity and others. This
superior functionality is achieved with proprietary and patented
process that allows extremely precise coating on one hemisphere without
affecting the other.
Optically anisotropic spheres with magnetic half-shells have numerous applications in diagnostics,
medical research, microscopy and biotechnology, as well as electronics,
due to 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. 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 or other stimuli. In alternating electromagnetic field, these microspheres have been proven to spin at hundreds of times per second.
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.
Now dual-functionalized microspheres, also called Janus particles,
are available to scientists and engineers to revolutionize products in
other industries. Imagine the possibilities.
Please contact us to discuss and put together a quote that matches your specific requirements.