title: The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight.
abstract: Corrosion of metallic surfaces is prevalent in the environment and is of great concern in many areas, including the military, transport, aviation, building and food industries, amongst others. Polyester and coatings containing both polyester and silica nanoparticles (SiO2NPs) have been widely used to protect steel substrata from corrosion. In this study, we utilized X-ray photoelectron spectroscopy, attenuated total reflection infrared micro-spectroscopy, water contact angle measurements, optical profiling and atomic force microscopy to provide an insight into how exposure to sunlight can cause changes in the micro- and nanoscale integrity of the coatings. No significant change in surface micro-topography was detected using optical profilometry, however, statistically significant nanoscale changes to the surface were detected using atomic force microscopy. Analysis of the X-ray photoelectron spectroscopy and attenuated total reflection infrared micro-spectroscopy data revealed that degradation of the ester groups had occurred through exposure to ultraviolet light to form COO·, -H2C·, -O·, -CO· radicals. During the degradation process, CO and CO2 were also produced.
authors: School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology.
authors: Vi Khanh
authors: VK
authors: Truong
authors: School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology.
authors: Miljan
authors: M
authors: Stefanovic
authors: BlueScope Steel Research.
authors: Shane
authors: S
authors: Maclaughlin
authors: Infrared Microspectroscopy Beamline, Australian Synchrotron.
authors: Mark
authors: M
authors: Tobin
authors: Infrared Microspectroscopy Beamline, Australian Synchrotron.
authors: Jitraporn
authors: J
authors: Vongsvivut
authors: School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology.
authors: Mohammad
authors: M
authors: Al Kobaisi
authors: School of Science, College of Science, Engineering and Health, RMIT University.
authors: Russell J
authors: RJ
authors: Crawford
authors: School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology; eivanova@swin.edu.au.
authors: Elena P
authors: EP
authors: Ivanova
mesh_terms: D003343:Corrosion; D018625:Microscopy, Atomic Force; D053758:Nanoparticles; D011091:Polyesters; D012822:Silicon Dioxide; D013472:Sunlight; D013499:Surface Properties
chemical_list: D011091:Polyesters; D012822:Silicon Dioxide