Challenges for physical characterization of silver nanoparticles under pristine and environmentally relevant conditions

The reported size distribution of silver nanoparticles (AgNPs) is strongly affected by the underlying measurement method, agglomeration state, and dispersion conditions. A selection of AgNP materials with vendor-reported diameters ranging from 1 nm to 100 nm, various size distributions, and biocompa...

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Bibliographic Details
Published in:Journal of environmental monitoring 2011-05, Vol.13 (5), p.1212-1226
Main Authors: MacCuspie, Robert I, Rogers, Kim, Patra, Manomita, Suo, Zhiyong, Allen, Andrew J, Martin, Matthew N, Hackley, Vincent A
Format: Article
Language:English
Subjects:
Adsorption
Environmental Monitoring - methods
Environmental Pollutants - analysis
Environmental Pollutants - chemistry
Metal Nanoparticles - analysis
Metal Nanoparticles - chemistry
Particle Size
Silver - analysis
Silver - chemistry
Wilderness
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Summary:The reported size distribution of silver nanoparticles (AgNPs) is strongly affected by the underlying measurement method, agglomeration state, and dispersion conditions. A selection of AgNP materials with vendor-reported diameters ranging from 1 nm to 100 nm, various size distributions, and biocompatible capping agents including citrate, starch and polyvinylpyrrolidone were studied. AgNPs were diluted with either deionized water, moderately hard reconstituted water, or moderately hard reconstituted water containing natural organic matter. Rigorous physico-chemical characterization by consensus methods and protocols where available enables an understanding of how the underlying measurement method impacts the reported size measurements, which in turn provides a more complete understanding of the state (size, size distribution, agglomeration, etc.) of the AgNPs with respect to the dispersion conditions. An approach to developing routine screening is also presented.
ISSN:1464-0325
1464-0333
DOI:10.1039/c1em10024f