in situ methods for monitoring silver nanoparticle sulfidation in simulated waters
作者： John M. Pettibone , Jingyu Liu
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摘要: To probe the transformation pathways of metallic nanomaterials, measurement tools capable detecting and characterizing broad distribution products with limited perturbation are required. Here, we demonstrate detection resulting from 40 kDa PVP-coated silver nanoparticles (AgNPs) reacted in aerated, sulfide-containing water EPA moderately hard reconstituted standard. Using single particle inductively coupled plasma mass spectrometry, preservation primary AgNP populations during sulfidation was observed under all reaction conditions examined. Disparate sensitivities Ag+ AgNPs to different media were observed, limiting confidence measured dissolved fraction. Examination hyphenated asymmetric flow field-flow fractionation (A4F) methods supported similar preservation. flow-cell FTIR measurements, provide direct evidence for PVP-coatings presence Na2S fulvic acid, which attribu...
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