New anti-fog coating for windshields developed
Washington, Feb 28 : Scientists have created a new water-repellant coating that resists both fogging and frosting for a range of devices, from automobile windshields to camera lenses.
Michael F. Rubner and Robert E. Cohen, professors of materials science and engineering and chemical engineering, respectively, at the Massachusettes Institute of Technology (MIT) point out that anti-fogging coatings that absorb water have been in focus lately because of their ability to reduce light scattering and 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, the journal ACS Nano reports.
They reported the development and testing of a new coating that rapidly absorbs water molecules that cannot freeze in the coating, according to an MIT statement.
At the same time, the coating has a water-repelling or hydrophobic effect to larger water droplets. The hydrophobic character means that water droplets do not spread extensively on the coating but essentially remain as flattened droplets.