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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 ... read morea 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.read less
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