Journal article
Transport of Iron-Based Nanoparticles: Role of Magnetic Properties
Environmental science & technology, v 43(23), pp 8834-8839
01 Dec 2009
PMID: 19943654
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The transport of magnetic nanoparticles in aquatic environments was studied using maghemite (gamma-Fe2O3) and gamma-Fe2O3 based (FexNi1-x)(y)O-z nanoparticles as a function of pH and particle iron content that induced a different magnetic property. Transport studies were conducted in packed bed columns (1 mM KCl, pH 6 and 9) and stability studies were done by dynamic light scattering and sedimentation measurements. Results showed that the stability and transport of these magnetic nanoparticles were influenced by a combination of electrostatic and magnetic interactions. Transport results showed that the less magnetic nanoparticles (possessing higher nickel content) eluted to a greater extent than the more magnetic particles at both pH 6 and 9. The stability in water at both pH 6 and 9 also increased, as nickel content in particles increased suggesting that magnetic interactions enhance aggregation. The nanoparticles eluted to a greater extent at pH 9, at which they were more negatively charged, than at pH 6. Complementary experiments were conducted with alpha-Fe2O3, a nonmagnetic, highly negatively charged nanoparticle which was transported more than the other magnetic particles. The majority of particles were retained at the column inlet (1-2 cm) for all transport experiments, with the greatest amount of retention being that of the magnetic nanoparticles (gamma-Fe2O3), indicating that magnetically induced aggregation and subsequent straining resulted in greater retention.
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Details
- Title
- Transport of Iron-Based Nanoparticles: Role of Magnetic Properties
- Creators
- Yongsuk Hong - University of California, RiversideRyan J. Honda - University of California, RiversideNosang V. Myung - University of California, RiversideSharon L. Walker - University of California, Riverside
- Publication Details
- Environmental science & technology, v 43(23), pp 8834-8839
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 6
- Grant note
- MYBEST@UCRDBI-0731660 / National Science Foundation Undergraduate Research and Mentoring; National Science Foundation (NSF) EF 0830117 / National Science Foundation and the Environmental Protection Agency University of California Toxic Substances Research and Teaching Program (UC TSR TP); University of California System
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Engineering
- Web of Science ID
- WOS:000272038900028
- Scopus ID
- 2-s2.0-72249095199
- Other Identifier
- 991021229996804721
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InCites Highlights
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- Web of Science research areas
- Engineering, Environmental
- Environmental Sciences