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Silver Nanoparticles for Environmental Health and Safety

Silver Nanoparticles for Environmental Health and Safety James P. Viccaro , University of Chicago, CHE 0822838 Matthew N. Martin ( NIST, University of Maryland ), Andrew J. Allen, Vince Hackley, Robert I. MacCuspie ( NIST ) Jan Ilavsky ( Argonne National Lab ).

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Silver Nanoparticles for Environmental Health and Safety

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  1. Silver Nanoparticles for Environmental Health and Safety James P. Viccaro, University of Chicago, CHE 0822838Matthew N. Martin (NIST, University of Maryland),Andrew J. Allen, Vince Hackley, Robert I. MacCuspie (NIST) • Jan Ilavsky (Argonne National Lab) Partly because, unlike gold, silver is partially soluble in water, quantification of silver nanoparticle (AgNP) size yields many conflicting values for identical samples using different measurement methods. Accurate characterization of individual AgNPs by high resolution microscopy (micrographs above, blue and green histograms below) and AgNPs in liquid dispersion using light and X-ray scattering (black and red curves) is essential for developing the AgNP structure–property relationships relevant to biology, toxicology, and environmental health and safety. Uniquely among the methods used, in situ ultra-small angle X-ray scattering (USAXS) studies at APS sector 15-ID have produced volume-weighted particle size distributions, facilitating the current development of AgNP NIST Reference Materials. Top: Transmission electron (left) and atomic force (right) microscopy (TEM and AFM) show individual particles. Below: Size distributions based on microscopy, diffuse light scattering (DLS) and USAXS for AgNPs in water. 200 nm MacCuspie et al. Journal of Environmental Monitoring (2011)

  2. Silver Nanoparticles for Environmental Health and SafetyJames P. Viccaro, University of Chicago, CHE 0822838 Matthew N. Martin (NIST, University of Maryland),Andrew J. Allen, Vince Hackley, Robert I. MacCuspie (NIST) • Jan Ilavsky (Argonne National Lab)CHE- 0822838 Consumer products such as clothes, food-packaging, and paper already exploit some of silver’s biocidal properties. NIST’s unique measurement capabilities and Reference Material development provide an ideal platform for nanotoxicity and environmental health and safety research of AgNPs. Also, although AgNPs are not believed to be toxic or environmentally harmful, much basic information is still lacking. NIST Reference Materials can help answer fundamental questions such as: What happens to the size distribution, particle morphology, and toxicity when AgNPs are dispersed in synthetic or natural aqueous environments? Or: How do AgNPs degrade when subjected to changes in pH or salinity within living organisms? Commercial AgNPs Basic Research measure compare motivate redesign NIST Reference Material standards redesign standards redesign Environmental Health and Safety Toxicology of AgNPs Diagram highlighting the broader impact of NIST AgNP reference materials.

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