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First permanent anti-fog coating developed

Date:
March 16, 2011
Source:
Université Laval
Summary:
Researchers have developed the very first permanent anti-fog coating. 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.

Foggy glass. A new innovation could eliminate, once and for all, the fog on eyeglasses, windshields, goggles, camera lenses, and on any transparent glass or plastic surface.
Credit: iStockphoto/Chepko Danil

Researchers under the supervision of Université Laval professor Gaétan 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 Université Laval's Faculty of Sciences and Engineering. "A good anti-fog coating should prevent the formation of such droplets."

Researchers used polyvinyl alcohol, a hydrophilic compound that allows water to spread uniformly. The challenge was to firmly attach the compound to the glass or plastic surface. To accomplish this, researchers applied four successive layers of molecules, which formed strong bonds with their adjoining layers, prior to adding the anti-fog compound over this base. The result was a thin, transparent, multilayered coating that does not alter the optical properties of the surface on which it is overlaid. In addition, the chemical bonds that join the different layers ensure the hardness and durability of the entire coating.

"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 Gaétan Laroche, the study published in Applied Materials and Interfaces was coauthored by Pascale Chevallier, Stéphane Turgeon, Christian Sarra-Bournet, and Raphaël Turcotte.


Story Source:

The above story is based on materials provided by Université Laval. Note: Materials may be edited for content and length.


Journal Reference:

  1. Pascale Chevallier, Stéphane Turgeon, Christian Sarra-Bournet, Raphaël Turcotte, Gaétan Laroche. Characterization of Multilayer Anti-Fog Coatings. ACS Applied Materials & Interfaces, 2011; 110307090243075 DOI: 10.1021/am1010964

Cite This Page:

Université Laval. "First permanent anti-fog coating developed." ScienceDaily. ScienceDaily, 16 March 2011. <www.sciencedaily.com/releases/2011/03/110316104117.htm>.
Université Laval. (2011, March 16). First permanent anti-fog coating developed. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2011/03/110316104117.htm
Université Laval. "First permanent anti-fog coating developed." ScienceDaily. www.sciencedaily.com/releases/2011/03/110316104117.htm (accessed July 28, 2014).

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