Title

The Effect of Organic Matter on the Aggregation Rates and Kinetics of Silver Nanoparticles

School Name

Governor's School for Science and Mathematics

Grade Level

12th Grade

Presentation Topic

Environmental Science

Presentation Type

Mentored

Abstract

Due to the rise in use and many questions raised regarding Silver Nanoparticles (AgNPs), we tested the behavior of the AgNPs against different water properties and the effects of ion concentration of Sodium Nitrate (NaNO3). The water properties included the presence of Natural Organic Matter (NOM) from Pacific Ocean and Everglades samples. We used Dynamic Light Scattering (DLS) to measure the hydrodynamic diameter, which correlates to the aggregation rates and kinetics of the AgNPs. The diameter increases because particles aggregate, increasing the overall size. We graphed these results against the different ion concentrations. We concluded that as the concentration of Sodium Nitrate increase, the aggregation rates of AgNPs also increase. This could be attributed to the surface charge screening in presence of counter ions. We also determined that the different NOMs did not show significant influence on the aggregation rates of AgNPs. Future works will continue to test how nanoparticles react in various environments with different physiochemical properties.

Location

Neville 110

Start Date

4-14-2018 9:45 AM

Presentation Format

Oral and Written

COinS
 
Apr 14th, 9:45 AM

The Effect of Organic Matter on the Aggregation Rates and Kinetics of Silver Nanoparticles

Neville 110

Due to the rise in use and many questions raised regarding Silver Nanoparticles (AgNPs), we tested the behavior of the AgNPs against different water properties and the effects of ion concentration of Sodium Nitrate (NaNO3). The water properties included the presence of Natural Organic Matter (NOM) from Pacific Ocean and Everglades samples. We used Dynamic Light Scattering (DLS) to measure the hydrodynamic diameter, which correlates to the aggregation rates and kinetics of the AgNPs. The diameter increases because particles aggregate, increasing the overall size. We graphed these results against the different ion concentrations. We concluded that as the concentration of Sodium Nitrate increase, the aggregation rates of AgNPs also increase. This could be attributed to the surface charge screening in presence of counter ions. We also determined that the different NOMs did not show significant influence on the aggregation rates of AgNPs. Future works will continue to test how nanoparticles react in various environments with different physiochemical properties.