Article
 

Effects of Natural Organic Matter Type and Concentration on the Aggregation of Citrate-Stabilized Gold Nanoparticles

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/articles/cn69m482z

Descriptions

Attribute NameValues
Creator
Abstract
  • The aggregation of 12 nm citrate-stabilized gold nanoparticles (cit-AuNPs) in the presence of four different natural organic matter (NOM) isolates and a monovalent electrolyte (KCl) was evaluated using time-resolved dynamic light scattering. All four NOM isolates stabilized the cit-AuNPs with respect to aggregation. However, specific effects varied among the different NOM isolates. At pH = 6 in 80 mM KCl, low concentrations (<0.25 mg C/L) of large molecular weight Suwannee River Humic Acid (SRHA) was required to stabilize cit-AuNPs, while larger concentrations (>2 mg C/L) of smaller Suwannee River Fulvic Acid (SRFA) were necessary at the same ionic strength. Suwannee River NOM (SRNOM) which contains both SRHA and SRFA behaved in a manner intermediate between the two. Pony Lake Fulvic Acid (PLFA), an autochthonous NOM isolate, provided substantial stability at low concentrations, yet aggregation was induced at NOM concentrations > 2 mg C/L, a trend that is hypothesized to be the result of favourable hydrophobic interactions between coated particles induced at increased surface coverage. For all NOM isolates, it appears that NOM adsorption or conformational changes at the AuNP surfaces result in significant increases in the hydrodynamic diameter that aren’t attributable to NP-NP aggregation.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Nason, J., McDowell, S., & Callahan, T. (2012). Effects of natural organic matter type and concentration on the aggregation of citrate-stabilized gold nanoparticles. JOURNAL OF ENVIRONMENTAL MONITORING, 14(7), 1885-1892. doi: 10.1039/c2em00005a
Journal Title
Journal Volume
  • 14
Journal Issue/Number
  • 7
Rights Statement
Funding Statement (additional comments about funding)
  • This work was funded by the Air Force Research Laboratory (agreement number FA8650-05-1-5041) and the National Science Foundation (Award 1067794).
Publisher
Peer Reviewed
Language
Replaces

Relationships

Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
file details NasonJeffreyChemicalBiologicalEnvironmentalEngineeringEffectsNaturalOrganic.pdf 2017-07-08 Public Download