%0 PDF %T Influence of Sunscreen Components on the Transport and Retention of Titanium Dioxide Nanoparticles in Water-Saturated Porous Media. %A Englehart, Jessica. %8 2017-04-18 %R http://localhost/files/ng451v30s %X Abstract: Titanium dioxide is among the most prominently used nanomaterials, particularly in cosmetic products such as sunscreens. This research was designed to examine the effect of sunscreen components, specifically polymeric stabilizing agents, on the transport and retention of uncoated titanium dioxide nanoparticles (nano-TiO2) in water-saturated quartz sands. This was achieved by performing a series of batch and one-dimensional column experiments in clean Federal Fine Ottawa sand. Since the point of zero charge for nano-TiO2 falls within a neutral range (6.3), suspension pH can enhance or inhibit transport through water-saturated porous medium. While the suspension pH can affect the extent of uncoated nano-TiO2 transport, this effect was overshadowed by the presence of a polymeric stabilizing agent within the suspension matrix. The addition of a polymer to a nano-TiO2 suspension greatly enhanced uncoated nano-TiO2 transport in water-saturated quartz sands. This behavior was successfully modeled using extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory and clean-bed filtration theory.; Thesis (M.S.)--Tufts University, 2011.; Submitted to the Dept. of Civil Engineering.; Advisor: Kurt Pennell.; Committee: Linda Abriola, and Yusong Li.; Keyword: Environmental engineering. %[ 2022-10-12 %9 Text %~ Tufts Digital Library %W Institution