On the use of high-gradient magnetic force field in capturing airborne particles

Cheng, Mengdawn; Murphy, Bart L.; Moon, Ji Won; Ludtka, Gerard Michael; Cable-Dunlap, Paula R.

doi:10.1016/j.jaerosci.2018.03.007

Title: On the use of high-gradient magnetic force field in capturing airborne particles

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Abstract

Airborne particles in the environment are generally smaller than a couple of microns. Use of magnetic force to collect aerosol particles thus has not been popular as the other means. There are billions of airborne particles emitted by a host of man-made sources with the particle size smaller than 1 µm and possess some magnetic susceptibility. We are thus interested in the use of high-gradient magnetic collection to extract the magnetic fraction in an aerosol population. Here in this study, we reported that the magnetic force is the dominant force in collection of ferromagnetic particles of mobility equivalent size larger than or equal to 50 nm in a high-gradient permanent-magnetic aerosol collector, while the diffusiophoretic force is responsible for particles smaller than 10 nm. Both forces compete for particles in between these two sizes in the magnetic aerosol collector designed for this study. To enable a wide-range effective collection of aerosol particles across entire size spectrum from a few nanometers to tens of a micron, the ORNL-designed high-gradient magnetic collector would require the use of an engineered matrix. Thus, the matrix design for a specific application becomes application specific. Irrespective of the collection efficiency, the use of permanent magnets tomore »« less

Authors:

^[1]; Murphy, Bart L. ^[2];

^[3];

^[2]; Cable-Dunlap, Paula R. ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioSciences Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Global Security Directorate

Publication Date:: Fri Jun 01 00:00:00 EDT 2018

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1435262

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Aerosol Science

Additional Journal Information:: Journal Volume: 120; Journal Issue: C; Journal ID: ISSN 0021-8502

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 54 ENVIRONMENTAL SCIENCES

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                    Cheng, Mengdawn, Murphy, Bart L., Moon, Ji Won, Ludtka, Gerard Michael, and Cable-Dunlap, Paula R. On the use of high-gradient magnetic force field in capturing airborne particles.  United States: N. p., 2018. 
Web.  doi:10.1016/j.jaerosci.2018.03.007.

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                    Cheng, Mengdawn, Murphy, Bart L., Moon, Ji Won, Ludtka, Gerard Michael, & Cable-Dunlap, Paula R. On the use of high-gradient magnetic force field in capturing airborne particles.  United States.  https://doi.org/10.1016/j.jaerosci.2018.03.007

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                    Cheng, Mengdawn, Murphy, Bart L., Moon, Ji Won, Ludtka, Gerard Michael, and Cable-Dunlap, Paula R. Fri .  
"On the use of high-gradient magnetic force field in capturing airborne particles".  United States.  https://doi.org/10.1016/j.jaerosci.2018.03.007.  https://www.osti.gov/servlets/purl/1435262.

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@article{osti_1435262,

  title        = {On the use of high-gradient magnetic force field in capturing airborne particles},

  author       = {Cheng, Mengdawn and Murphy, Bart L. and Moon, Ji Won and Ludtka, Gerard Michael and Cable-Dunlap, Paula R.},

  abstractNote = {Airborne particles in the environment are generally smaller than a couple of microns. Use of magnetic force to collect aerosol particles thus has not been popular as the other means. There are billions of airborne particles emitted by a host of man-made sources with the particle size smaller than 1 µm and possess some magnetic susceptibility. We are thus interested in the use of high-gradient magnetic collection to extract the magnetic fraction in an aerosol population. Here in this study, we reported that the magnetic force is the dominant force in collection of ferromagnetic particles of mobility equivalent size larger than or equal to 50 nm in a high-gradient permanent-magnetic aerosol collector, while the diffusiophoretic force is responsible for particles smaller than 10 nm. Both forces compete for particles in between these two sizes in the magnetic aerosol collector designed for this study. To enable a wide-range effective collection of aerosol particles across entire size spectrum from a few nanometers to tens of a micron, the ORNL-designed high-gradient magnetic collector would require the use of an engineered matrix. Thus, the matrix design for a specific application becomes application specific. Irrespective of the collection efficiency, the use of permanent magnets to collect magnetic particles is feasible and also highly selective because it tunes into the magnetic susceptibility of the particles as well as the size. Lastly, the use of permanent magnets enables the collector to be operated at a minimal power requirement, which is a critical factor in long-term field operation.},

  doi          = {10.1016/j.jaerosci.2018.03.007},

  journal      = {Journal of Aerosol Science},

  number       = C,

  volume       = 120,

  place        = {United States},

  year         = {Fri Jun 01 00:00:00 EDT 2018},

  month        = {Fri Jun 01 00:00:00 EDT 2018}

}

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