Introducing The Self-Cleaning, Smog-Eating Building
Introducing The Self-Cleaning, Smog-Eating Building
May 9, 2011 By Ariel Schwartz http://www.alcoa.com/common/images/g..._logo_wide.gif Read More: http://www.fastcompany.com/1752324/i...ating-building Website: http://www.alcoa.com/bcs/aap_eastman...an/en/home.asp Quote:
http://www.alcoa.com/bcs/aap_eastman...ean/en/how.asp The air-cleaning properties of Reynobond® with EcoClean™, Powered by HYDROTECT™ begin with the reaction created by titanium dioxide when exposed to sunlight. When sunlight strikes a particle of titanium dioxide, electrons within the particle become excited, creating a higher state of energy within the electrons. The energized electrons transfer energy to water in the air and form free radicals, -OH (hydroxyl radicals) and O2- (superoxide anions). These free radicals are both powerful oxidizers that can attack any organic material either on the panel’s surface or floating near it. Electrons in the TiO2 become energized by UV light. http://www.alcoa.com/bcs/aap_eastman...ss_image_1.jpg These electrons transfer energy to oxygen and water in the air. http://www.alcoa.com/bcs/aap_eastman...ss_image_2.jpg Free radicals are formed by the transferred energy (O2-, .OH). http://www.alcoa.com/bcs/aap_eastman...ss_image_3.jpg The free radicals attack and destroy organic matter via oxidation. http://www.alcoa.com/bcs/aap_eastman...ss_image_4.jpg .OH free radicals called hydroxyls group on the surface of EcoClean™. http://www.alcoa.com/bcs/aap_eastman...ss_image_5.jpg The hydroxyls make the building surface super slick. Instead of beading up on the surface, the water collapses on the surface and runs off, undercutting dirt and grime. http://www.alcoa.com/bcs/aap_eastman...ss_image_6.jpg |
Cool idea, though it sounds incredibly complex and expensive for the equivalent of only 80 trees.
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If China had this in most of their buildings it would be most welcome.
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And though it may serve the same function that 80 trees would in absorbing NOx, I bet that many allergy sufferers would welcome the reduction in tree pollen. Not that this is an adequate argument for getting rid of trees, but it's something. |
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