Honors College Thesis

 

Environmental Transformations of Nanoparticles in Natural Water Systems using a Hydrophobic and Hydrophilic Dye Assay Public Deposited

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https://ir.library.oregonstate.edu/concern/honors_college_theses/5h73q229b

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  • Nanoparticles (NPs) are generally defined as particles <100 nanometers (nm) in size in one dimension. Despite increasing industrial usage of TiO2 NPs in sunscreens, cosmetics, and water remediation little is known of their environmental behavior. The primary goal of this research was to develop a rapid method for determining the relative hydrophobicity of NPs. Relative hydrophobicity is vital in understanding the fate and transport of chemicals, but traditional water-octanol partitioning methods do not work with particles that can agglomerate and sediment out of solution. This research investigated how natural waters impact the hydrodynamic diameter (HDD), zeta potential and relative surface hydrophobicity of TiO2 NPs relative to laboratory measures in ultrapure water. TiO2 NPs were chosen for this research because they are one of the most produced NPs in the world and thus have a good chance of entering the environment. Understanding how TiO2 NPs are transformed through development of natural surface coatings by natural waters is critical for the accurate assessment of NP environmental risk. Intrinsically hydrophobic TiO2 NPs became hydrophilic when incubated in natural water sources due to natural organic matter (NOM) and ions found in the water coating the surface of NPs. Key Words: titanium dioxide, natural organic matter, nanoparticles, spectrophotometry, hydrophobicity
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  • URSA ENGAGE
  • Johnson Internship
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