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Janus multi-responsive superparamagnetic nanoparticles functionalized with two on-demand and independently cleavable ligands for Actinide separation. J Colloid Interface Sci 2019; 538:546-558. [DOI: 10.1016/j.jcis.2018.12.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 11/09/2018] [Accepted: 12/06/2018] [Indexed: 01/07/2023]
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Dutz S, Hayden ME, Häfeli UO. Fractionation of Magnetic Microspheres in a Microfluidic Spiral: Interplay between Magnetic and Hydrodynamic Forces. PLoS One 2017; 12:e0169919. [PMID: 28107472 PMCID: PMC5249185 DOI: 10.1371/journal.pone.0169919] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 12/23/2016] [Indexed: 01/09/2023] Open
Abstract
Magnetic forces and curvature-induced hydrodynamic drag have both been studied and employed in continuous microfluidic particle separation and enrichment schemes. Here we combine the two. We investigate consequences of applying an outwardly directed magnetic force to a dilute suspension of magnetic microspheres circulating in a spiral microfluidic channel. This force is realized with an array of permanent magnets arranged to produce a magnetic field with octupolar symmetry about the spiral axis. At low flow rates particles cluster around an apparent streamline of the flow near the outer wall of the turn. At high flow rates this equilibrium is disrupted by the induced secondary (Dean) flow and a new equilibrium is established near the inner wall of the turn. A model incorporating key forces involved in establishing these equilibria is described, and is used to extract quantitative information about the magnitude of local Dean drag forces from experimental data. Steady-state fractionation of suspensions by particle size under the combined influence of magnetic and hydrodynamic forces is demonstrated. Extensions of this work could lead to new continuous microscale particle sorting and enrichment processes with improved fidelity and specificity.
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Affiliation(s)
- S. Dutz
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada
- Institute of Biomedical Engineering and Informatics (BMTI), Technische Universität Ilmenau, Ilmenau, Germany
| | - M. E. Hayden
- Department of Physics, Simon Fraser University, Burnaby, Canada
| | - U. O. Häfeli
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada
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Orita T, Moore LR, Joshi P, Tomita M, Horiuchi T, Zborowski M. A quantitative determination of magnetic nanoparticle separation using on-off field operation of quadrupole magnetic field-flow fractionation (QMgFFF). ANAL SCI 2013; 29:761-4. [PMID: 23842422 PMCID: PMC3919639 DOI: 10.2116/analsci.29.761] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 05/23/2013] [Indexed: 11/11/2023]
Abstract
Quadrupole Magnetic Field-Flow Fractionation (QMgFFF) is a technique for characterization of sub-micrometer magnetic particles based on their retention in the magnetic field from flowing suspensions. Different magnetic field strengths and volumetric flow rates were tested using on-off field application and two commercial nanoparticle preparations that significantly differed in their retention parameter, λ (by nearly 8-fold). The fractograms showed a regular pattern of higher retention (98.6% v. 53.3%) for the larger particle (200 nm v. 90 nm) at the higher flow rate (0.05 mL/min v. 0.01 mL/min) at the highest magnetic field (0.52 T), as expected because of its lower retention parameter. The significance of this approach is a demonstration of a system that is simpler in operation than a programmed field QMgFFF in applications to particle mixtures consisting of two distinct particle fractions. This approach could be useful for detection of unwanted particulate contaminants, especially important in industrial and biomedical applications.
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Affiliation(s)
- Toru Orita
- Division of Chemistry for Materials, Graduate School of
Engineering, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8570, Japan
- Taiyo Kagaku Co. Ltd., 800 Yamada-cho, Yokkaichi, Mie
512-1111, Japan
- Department of Biomedical Engineering, Lerner Research
Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195, USA
| | - Lee R. Moore
- Department of Biomedical Engineering, Lerner Research
Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195, USA
| | - Powrnima Joshi
- Department of Biomedical Engineering, Lerner Research
Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195, USA
| | - Masahiro Tomita
- Division of Chemistry for Materials, Graduate School of
Engineering, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8570, Japan
| | - Takashi Horiuchi
- Division of Chemistry for Materials, Graduate School of
Engineering, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8570, Japan
| | - Maciej Zborowski
- Department of Biomedical Engineering, Lerner Research
Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195, USA
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