Nano-Engineering Could Spell the End of Road Salt
November 13th, 2010 by Tina Casey
Road salt, which keeps our roads and highways passable in winter while poisoning nearby environments, leaching into streams and lakes, and doing nasty things to the metal parts of our cars, may be on its way out. Engineers at Harvard University are developing new nanostructured materials that can prevent surfaces from icing by repelling water before it has a chance to freeze. Along with eliminating the direct impacts of salt on the environment, the new materials would also cut carbon emissions related to shipping and spreading road salt.
New Nano-Surfaces that Prevent Ice Buildup
The engineers based their approach on the fact that ice buildup is a dynamic process that occurs over time, and they modeled their materials on bristles and other repellent surfaces found in nature. High speed video playback of water droplets hitting the surfaces revealed the forces at play in ice prevention. When water hits a smooth surface, it spreads out, clings and freezes. When it hits a repellent surface, it acts like a rubber ball in a cartoon: it flattens out on impact but then springs back to its round shape and bounces away.
The Next Step for Environmentally Friendly De-Icing
The engineers note that nano-structured materials could be used as coatings for airplanes and other objects, as well as for road surfaces. The labwork is promising and real-world testing has begun. It’s also possible that the new materials could be used in tandem with other sustainable de-icing technologies on the horizon, such as solar energy harvested from road surfaces.
Image: Road salt by benimoto on flickr.com
Check out our new 93-page EV report.
Join us for an upcoming Cleantech Revolution Tour conference!
Keep up to date with all the hottest cleantech news by subscribing to our (free) cleantech daily newsletter or weekly newsletter, or keep an eye on sector-specific news by getting our (also free) solar energy newsletter, electric vehicle newsletter, or wind energy newsletter.
About the Author
Tina Casey specializes in military and corporate sustainability, advanced technology, emerging materials, biofuels, and water and wastewater issues. Tina’s articles are reposted frequently on Reuters, Scientific American, and many other sites. Views expressed are her own. Follow her on Twitter @TinaMCasey and Google+.
Related Posts
Harvard University “Pausing” Investments For Some Fossil Fuels →
Many US Freshwater Lakes Could Surpass “Safe” Chloride Levels Within 50 Years →
Fossil Fuel Industry Pays For Climate Change Studies By Academia →
Convenience & Inconvenience — Another Large Vehicle Blocking EV Charging →
-
dean
-
LWB_Sr
