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Janus Particles

Half-Coated Spheres - Half-Shells - Hemispherical Coatings on Microspheres - Partial Coatings of Microparticles

Cospheric 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.


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Products 1-10 of 10
Paramagnetic Black Half Coated PE Spheres 1mm
Product ID: HCMS-XXX-BLK
Solid Microspheres with Partial Black Paramagnetic Coating (Bipolar and Bichromal Particles)
Particle Size ranges between 45micron and 1400micron (1.4mm)
[more info...]
Price: $495.00


Fluorescent Green Coating on Paramagnetic Black Core 50um
Product ID: HCMS-BLK-FMG
Solid Black Paramagnetic Polyethylene Microspheres with Partial Fluorescent Green Coating
Particle Size ranges between 45micron and 1.2mm, Specify at time of order
[more info...]
Price: $495.00


Blue Fluorescent Hemispherical Coating on Solid Glass Microspheres 45-53 micron - 100X magnification
Product ID: HCMS-FMB
Fluorescent Blue Hemispherical Coating on Borosilicate, Soda Lime or Barium Titanate Solid Glass Spheres
Color: Bright Blue under daylight and UV illumination (445nm peak emission)
[more info...]
Price: $295.00-$495.00


Green Fluorescent  Hemispherical Coating on Solid Glass Microspheres 45-53 micron - 100X magnification
Product ID: HCMS-FMG
Fluorescent Green Hemispherical Coating on Borosilicate, Soda Lime or Barium Titanate Solid Glass Spheres
Color: Bright Green under daylight and UV illumination (515nm peak emission)
[more info...]
Price: $295.00-$495.00


Yellow Fluorescent Hemispherical Coating on Solid Glass Microspheres 45-53 micron - 200X magnification
Product ID: HCMS-FMY
Fluorescent Yellow Hemispherical Coating on Borosilicate, Soda Lime or Barium Titanate Solid Glass Spheres
Color: Bright Yellow under daylight and UV illumination (525nm peak emission)
[more info...]
Price: $495.00


Orange-Yellow Fluorescent-Coated Glass Microspheres fluorescent Orange-Yellow glass, fluorescent Orange-Yellow glass spheres, microspheres, particles, microparticles, beads, UV
Product ID: HCMS-FMOY
Fluorescent Orange-Yellow Hemispherical Coating on Borosilicate, Soda Lime or Barium Titanate Solid Glass Spheres
Color: Bright Orange-Yellow under daylight and UV illumination (594nm peak emission)
[more info...]
Price: $495.00


Orange Fluorescent Hemispherical Coating on Solid Glass Microspheres 45-53 micron - 200X magnification
Product ID: HCMS-FMO
Fluorescent Orange Hemispherical Coating on Borosilicate, Soda Lime or Barium Titanate Solid Glass Spheres
Color: Bright Orange under daylight and UV illumination (606nm peak emission)
[more info...]
Price: $495.00


Red Fluorescent Hemispherical Coating on Solid Glass Microspheres 45-53 micron - 200X magnification
Product ID: HCMS-FMR
Fluorescent Red Hemispherical Coating on Borosilicate, Soda Lime or Barium Titanate Solid Glass Spheres
Color: Bright Red under daylight and UV illumination (607nm peak emission)
[more info...]
Price: $375.00-$495.00


Violet Fluorescent-Coated Glass Microspheres fluorescent Violet glass, fluorescent Violet glass spheres, microspheres, particles, microparticles, beads, UV
Product ID: HCMS-FMV
Fluorescent Violet Hemispherical Coating on Borosilicate, Soda Lime or Barium Titanate Solid Glass Spheres
Color: Bright Violet under daylight and UV illumination (636nm peak emission)
[more info...]
Price: $495.00


Black Paramagnetic-Coated Glass Microspheres Black Paramagnetic glass, glass spheres, microspheres, particles, microparticles, beads
Product ID: HCMS-BLK
Paramagnetic Black Coated Glass Microspheres, Spheres, Beads, Microparticles
Coating on Borosilicate, Soda Lime or Barium Titanate Solid Glass Spheres
[more info...]
Price: $495.00


Products 1-10 of 10

More information on Bichromal Janus Particles:

Red and White Electrostatic Janus Particles - Microparticles with Response to Electric FieldJanus Particles are named ater Janus, two-faced Roman GodNamed 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.

Transparent and Opaque Janus Particles - Half-shell Coated Glass Microspheres

Rotating Particles (Balls, Beads, Spheres) in Electric Field - Bichromal Black and White SpheresThe 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.