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Publication Citation: Surface Chemical Transformations of UV irradiated Silica-Epoxy Nanocomposites

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Author(s): Justin M. Gorham; Tinh Nguyen; Deborah L. Stanley; Coralie Bernard; Richard D. Holbrook;
Title: Surface Chemical Transformations of UV irradiated Silica-Epoxy Nanocomposites
Published: May 15, 2013
Abstract: Silica nanoparticles (SiNPs) incorporated into a polymeric matrix, or silica nanocomposites (SiNCs), are used in a wide variety of commercially available products in numerous natural and artificial environments. Environmental factors, such as light, may modify the SiNCs during their lifetime of service, giving rise to the possibility of degradation leading to nanoparticle (NP) release. Ultimately, light-induced modifications are most likely to occur at the SiNC-gas interface, which suggests that surface transformations will play a major role in the potential release of SiNPs throughout the lifecycle of this material. To better understand these surface transformations, we investigated the impact of high intensity simulated solar radiation (290 nm to 400 nm) on the surface and bulk properties of SiNCs created from unmodified SiNPs. Surface spectroscopic analysis (XPS) was employed to understand the chemical transformations that occur as a result of UV-aging of SiNCs. Results demonstrate that UV-induced transformations of SiNCs occurred via photo-oxidation of the epoxy matrix resulting in a subsequent loss of polymeric material and surface enhancements in the silicon and nitrogen concentrations.
Conference: Surface Transformations of UV-Irradiated Polymer Nanocomposites
Proceedings: Surface Chemical Transformations of UV irradiated Silica-Epoxy Nanocomposites
Volume: 3
Pages: pp. 469 - 472
Location: Washington, DC
Dates: May 12-16, 2013
Keywords: silica; nanoparticles; nanoEHS; photodegradation; nanocomposites
Research Areas: Nanocomposites, Characterization, Nanometrology, and Nanoscale Measurements, Nanotech/Environment, Health & Safety
PDF version: PDF Document Click here to retrieve PDF version of paper (739KB)