Journal article
Visualization of transport and fate of nano and micro-scale particles in porous media: modeling coupled effects of ionic strength and size
Environmental science. Nano, v 4(5), pp 1025-1036
01 May 2017
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
In this investigation, the single collector removal efficiency (eta) of three latex nanoparticles differing in size (20, 200, 2000 nm) is presented for a 2-D micromodel system. The eta for each collector grain as a whole and by quadrant was evaluated across a range of ionic strengths (1-100 mM KCl). Fluorescence microscopy allowed for the direct visualization of latex nanoparticle transport and deposition under the aforementioned ionic strengths and particle sizes. A rigorous numerical model was developed that incorporates DLVO forces (electrostatic and van der Waals interactions), as well as hydrodynamic forces utilizing COMSOL over the range of experimental conditions tested to calculate eta. This expression, based on a modification of filtration theory, accounts for the observed variation in deposition with respect to the location (or quadrant) on the collector, ionic strength, and particle size. Visual and theoretical findings in this investigation confirm that the greatest deposition along the collector surface occurs at the rear stagnation region of an individual collector. In addition, the single collector removal efficiency increases with ionic strength as well as particle size. This research demonstrates the critical nature of the cumulative effects the hydrodynamic forces, size, and ionic strength have with respect to the interactions between particles and collectors.
Metrics
Details
- Title
- Visualization of transport and fate of nano and micro-scale particles in porous media: modeling coupled effects of ionic strength and size
- Creators
- Chen Chen - University of California, RiversideTravis Waller - University of California, RiversideSharon L. Walker - University of California, Riverside
- Publication Details
- Environmental science. Nano, v 4(5), pp 1025-1036
- Publisher
- Royal Soc Chemistry
- Number of pages
- 12
- Grant note
- Department of Education; US Department of Education National Science Foundation (NSF) P200A130127 / Department of Education (GAANN); US Department of Education CBET-0954130 / NSF; National Science Foundation (NSF) UC-CEIN (University of California Center for Environmental Implications of Nanotechnology) NSF; National Science Foundation (NSF) 1144635 / NSF IGERT: Water SENSE Water Social, Engineering, and Natural Sciences Engagement Program 1144635 / Direct For Education and Human Resources; National Science Foundation (NSF); NSF - Directorate for STEM Education (EDU) 1144635 / Division Of Graduate Education; National Science Foundation (NSF); NSF - Directorate for STEM Education (EDU) DBI 0830117 / EPA; United States Environmental Protection Agency Environmental Protection Agency (EPA); United States Environmental Protection Agency
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Engineering
- Web of Science ID
- WOS:000401646200004
- Scopus ID
- 2-s2.0-85021936845
- Other Identifier
- 991021229897204721
UN Sustainable Development Goals (SDGs)
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Multidisciplinary
- Environmental Sciences
- Nanoscience & Nanotechnology