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Characterization of Nanoparticles and Colloids in Aquatic Systems 1. Small Angle Neutron Scattering Investigations of Suwannee River Fulvic Acid Aggregates in Aqueous Solutions

Diallo, Mamadou S. and Glinka, Charles J. and Goddard, William A., III and Johnson, James H., Jr. (2005) Characterization of Nanoparticles and Colloids in Aquatic Systems 1. Small Angle Neutron Scattering Investigations of Suwannee River Fulvic Acid Aggregates in Aqueous Solutions. Journal of Nanoparticle Research, 7 (4-5). pp. 435-448. ISSN 1388-0764. doi:10.1007/s11051-005-7524-4. https://resolver.caltech.edu/CaltechAUTHORS:20200221-154418772

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Abstract

Fulvic acids (FA) and humic acids (HA) constitute 30–50% of dissolved organic matter in natural aquatic systems. In aqueous solutions, a commonly accepted view is that FA and HA exist as soluble macroligands at low concentration and as supramolecular aggregates at higher concentration. The size, shape and structure of these aggregates are still the subject of ongoing debate in the environmental chemistry literature. In this article, we use small angle neutron scattering (SANS) to assess the effects of solute concentration, solution pH and background electrolyte (NaCl) concentration on the structures of Suwannee River FA (SRFA) aggregates in D₂O. The qualitative features of the SANS curves and data analysis are not consistent with the view point that SRFA forms micelle-like aggregates as its concentration in aqueous solution increases. We find that SRFA forms fractal aggregates in D₂0 with size greater than 242 nm. The SRFA aggregates undergo a significant degree of restructuring in compactness as solution pH, solute concentration and NaCl concentration increase.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/s11051-005-7524-4DOIArticle
https://rdcu.be/b11M0PublisherFree ReadCube access
ORCID:
AuthorORCID
Diallo, Mamadou S.0000-0002-2571-1568
Goddard, William A., III0000-0003-0097-5716
Additional Information:© 2005 Springer. Received 9 March 2005; accepted in revised form 17 May 2005. We thank Dr. Steve Kline of the NIST Center for Neutron Research for serving as NIST internal reviewer for this manuscript. This research was carried out in the Department of Civil Engineering at Howard University, at the Materials and Process Simulation Center of the Beckman Institute at the California Institute of Technology and at the Center for Neutron Research of the National Institute of Standards and Technology (NIST). Funding for this research was provided by the US Department of Commerce to Howard University and Caltech by the US Department of Commerce under Cooperative Agreement 7NANB8HO102. Partial funding for this research was also provided to Howard University by the Great Lakes and Mid- Atlantic Hazardous Substance Research Center under Grant R-825540 from the USEPA Office of Research and Development. We acknowledge the support of NIST in providing facilities used for this work. This material is based upon activities supported by the National Science Foundation under agreement No. DMR-9986442.
Funders:
Funding AgencyGrant Number
Department of Commerce7NANB8HO102
Environmental Protection Agency (EPA)R-825540
National Institute of Standards and Technology (NIST)UNSPECIFIED
NSFDMR-9986442
Subject Keywords:aggregates, aquatic colloids, fractals, fulvic acids, humic substances, nanoparticles, natural organic matter and neutron scattering water quality
Other Numbering System:
Other Numbering System NameOther Numbering System ID
WAG0629
Issue or Number:4-5
DOI:10.1007/s11051-005-7524-4
Record Number:CaltechAUTHORS:20200221-154418772
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200221-154418772
Official Citation:Diallo, M.S., Glinka, C.J., Goddard, W.A. et al. Characterization of Nanoparticles and Colloids in Aquatic Systems 1. Small Angle Neutron Scattering Investigations of Suwannee River Fulvic Acid Aggregates in Aqueous Solutions. J Nanopart Res 7, 435–448 (2005). https://doi.org/10.1007/s11051-005-7524-4
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101475
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Feb 2020 17:11
Last Modified:16 Nov 2021 18:02

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