Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 368, Issue 1-3, Pages 91-95Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2010.07.019
Keywords
Characterization; Nanoparticle; Protocol; Sonication; Stability; Transport
Categories
Funding
- University of California Center for the Environmental Implications of Nanotechnology (National Science Foundation and Environmental Protection Agency) [NSF-EF0830117]
- Div Of Biological Infrastructure
- Direct For Biological Sciences [0830117] Funding Source: National Science Foundation
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A study has been conducted to investigate the impact of experimental handling approaches on the state of model nanoparticles, from the container of dry particles to the characterization of suspended particles. Specifically, the effects of sonication, nanoparticle concentration, and ionic strength upon the size, electrophoretic mobility, and stability of the model metal oxides (TiO2. CeO2 and ZnO) were investigated. For initial breakup of dried nanoparticles in water, results indicate 30 min is the optimum sonication duration (120W) all three metal oxide nanoparticles over the solution chemistry tested. Since aggregation is evident in metal oxide nanoparticles, sonication to achieve a proper dispersion of nanoparticles in solution is necessary prior to further experimentation. No more than 30s sonication is needed for preparing well-dispersed test sample from the diluted stock suspension. Effects of nanoparticle concentration on the solution chemistry were also studied. TiO2 or CeO2 addition can reduce pH with increase of nanoparticle concentration; whereas pH increases with ZnO concentration. Consideration of these parameters (effects of sonication, nanoparticle concentration, and solution chemistry) is necessary to ensure successful subsequent toxicity and transport studies. (C) 2010 Elsevier B.V. All rights reserved.
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