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

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This is the author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Royal Society of Chemistry and can be found at:  http://pubs.rsc.org/en/journals/journalissues/em#!issueid=em014012&type=archive&issnprint=1464-0325.

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  • 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.
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  • 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
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  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2013-01-23T19:27:33Z No. of bitstreams: 1 NasonJeffreyChemicalBiologicalEnvironmentalEngineeringEffectsNaturalOrganic.pdf: 223750 bytes, checksum: fb8c3dde92e86adc5905eb000db145e6 (MD5)
  • description.provenance : Made available in DSpace on 2013-01-23T21:25:02Z (GMT). No. of bitstreams: 1 NasonJeffreyChemicalBiologicalEnvironmentalEngineeringEffectsNaturalOrganic.pdf: 223750 bytes, checksum: fb8c3dde92e86adc5905eb000db145e6 (MD5) Previous issue date: 2012-07
  • description.provenance : Approved for entry into archive by Deanne Bruner(deanne.bruner@oregonstate.edu) on 2013-01-23T21:25:02Z (GMT) No. of bitstreams: 1 NasonJeffreyChemicalBiologicalEnvironmentalEngineeringEffectsNaturalOrganic.pdf: 223750 bytes, checksum: fb8c3dde92e86adc5905eb000db145e6 (MD5)

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