BlueScope Steel Research 1 article published in JoVE Engineering The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight Vi Khanh Truong1, Miljan Stefanovic1, Shane Maclaughlin2, Mark Tobin3, Jitraporn Vongsvivut3, Mohammad Al Kobaisi1, Russell J. Crawford4, Elena P. Ivanova1 1School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, 2BlueScope Steel Research, 3Infrared Microspectroscopy Beamline, Australian Synchrotron, 4School of Science, College of Science, Engineering and Health, RMIT University Two types of surfaces, polyester-coated steel and polyester coated with a layer of silica nanoparticles, were studied. Both surfaces were exposed to sunlight, which was found to cause substantial changes in the chemistry and nanoscale topography of the surface.