期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 540, 期 -, 页码 330-341出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.01.036
关键词
Platinum nanoparticle; Seed mediated growth; Multimethod characterization; Aggregation kinetics; (Eco)toxicological media; Colloidal stability of nanoparticles
资金
- United States National Science Foundation [NSF1437307]
- Virginia Tech National Center for Earth and Environmental Nanotechnology Infrastructure
- Unites States National Science Foundation [ECCS 1542100]
The release of platinum group elements, including platinum nanoparticles (PtNPs), has been increasing over recent decades. However, few studies have investigated the fate, behavior and effects of PtNPs in environmental media. Here, we report a protocol for the synthesis of five different sizes (8.5 +/- 1.2, 10.3 +/- 1.3, 20.0 +/- 4.8, 40.5 +/- 4.1, and 70.8 +/- 4.2 nm) of monodispersed citrate- and polyvinylpyrrolidone (PVP)-coated PtNPs, together with a characterization of their behaviors using a multi method approach in relevant biological and toxicological media. In general, PtNPs sizes measured using dynamic light scattering, field flow fractionation, single-particle inductively-coupled plasma-mass spectroscopy, transmission electron microscopy and atomic force microscopy, were all in good agreement when PtNP sizes were larger than the size detection limits of each analytical technique. Slight differences in sizes measured were attributable to differences in analytical techniques, measuring principles, NP shape and NP permeability. The thickness of the PVP layer increased (from 4.4 to 11.35 nm) with increases in NP size. The critical coagulation concentration of cit-PtNPs was independent of NP size, possibly due to differences in PtNPs surface charges as a function of NP size. PtNP5 did not undergo significant dissolution in any media tested. PtNP5 did not aggregate significantly in Dulbecco's modified Eagle's medium; but they formed aggregates in moderately hard water and in 30 ppt synthetic seawater, and aggregate size increased with increases in PtNPs concentration. Overall, this study describes a general model NP system (i.e., PtNPs) of different controlled NP sizes and coatings that is predictable, stable and useful to investigate the fate, behavior, uptake, and eco-toxicity of NPs in the environment. (C) 2019 Elsevier Inc. All rights reserved.
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