March 16, 2011
Researchers Develop The First Permanent Anti-Fog Coating
Researchers under the supervision of Universit© Laval professor Ga©tan Laroche have developed the very first permanent anti-fog coating. Dr. Laroche and his colleagues present in the online edition of Applied Materials and Interfaces the details of this innovation which could eliminate, once and for all, the fog on eyeglasses, windshields, goggles, camera lenses, and on any transparent glass or plastic surface.
Fog forms on a surface when water vapor in the air condenses in fine droplets. "Despite appearances, the fog that forms on glasses is not a continuous film. In fact, it consists of tiny droplets of water that coalesce on the surface and reduce light transmission," explains Laroche, a professor at Universit© Laval's Faculty of Sciences and Engineering. "A good anti-fog coating should prevent the formation of such droplets."
"Existing anti-fog treatments don't have these properties and won't withstand washing, so the product application must be repeated regularly," notes Professor Laroche. "Our coating, on the other hand, is permanent."
Two patents already protect this invention, which has numerous potential applications, including vehicle windshields, protective visors, camera lenses, binoculars, optical instruments used in chemistry and medicine, and corrective lenses. Negotiations are already underway with a major eyewear company interested in obtaining a license for this technology.
In addition to Ga©tan Laroche, the study published in Applied Materials and Interfaces was coauthored by Pascale Chevallier, St©phane Turgeon, Christian Sarra-Bournet, and RaphaÃ«l Turcotte.
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