Washington: A new water-repellent coating for glass that resists both fogging and frosting could keep glass clear under the harshest of conditions, US researchers say.
Scientists at the Massachusetts Institute of Technology say the coating could have uses ranging from automobile windshields to camera lenses.
Michael F. Rubner, Robert E. Cohen and colleagues point out those 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.
In a bid to make a better coating to withstand the aggressive conditions, they developed a new coating that rapidly absorbs water molecules that cannot freeze in the coating.
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.
The study has been published in the journal ACS Nano.