A new anti-frost and anti-fog coating for glass

February 27th, 2013 in Nanotechnology / Nanomaterials
A new anti-frost and anti-fog coating for glass
A coating could someday prevent frost and fog from forming on windshields, camera lenses and other surfaces. Credit: iStockphoto/Thinkstock


A coating could someday prevent frost and fog from forming on windshields, camera lenses and other surfaces. Credit: iStockphoto/Thinkstock

In an advance toward glass that remains clear under the harshest of conditions, scientists are reporting development of a new water-repellant coating that resists both fogging and frosting. Their research on the coating, which could have uses ranging from automobile windshields to camera lenses, appears in the journal ACS Nano

Michael F. Rubner, Robert E. Cohen and colleagues point out that anti-fogging coatings that absorb water have been the focus of attention lately because of their ability to reduce light scattering and the resultant distortion caused by condensation. However, under extreme fogging conditions, these surfaces may frost and become foggy. They set out to make a better coating to withstand the aggressive conditions.

Their report describes development and testing of a new coating that rapidly absorbs that cannot freeze in the coating. At the same time, the coating has a water- or hydrophobic effect to larger water droplets. The hydrophobic character means that do not spread extensively on the coating but essentially remain as flattened droplets.

More information: Zwitter-Wettability and Antifogging Coatings with Frost-Resisting Capabilities, ACS Nano. pubs.acs.org/doi/abs/10.1021/nn3057966

Provided by American Chemical Society

"A new anti-frost and anti-fog coating for glass." February 27th, 2013. http://phys.org/news/2013-02-anti-frost-anti-fog-coating-glass.html