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Title: Gram scale synthesis of Fe/FexOy core–shell nanoparticles and their incorporation into matrix-free superparamagnetic nanocomposites

Abstract

In this paper, significant reductions recently seen in the size of wide-bandgap power electronics have not been accompanied by a relative decrease in the size of the corresponding magnetic components. To achieve this, a new generation of materials with high magnetic saturation and permeability are needed. Here, we develop gram-scale syntheses of superparamagnetic Fe/FexOy core–shell nanoparticles and incorporate them as the magnetic component in a strongly magnetic nanocomposite. Nanocomposites are typically formed by the organization of nanoparticles within a polymeric matrix. However, this approach can lead to high organic fractions and phase separation; reducing the performance of the resulting material. Here, we form aminated nanoparticles that are then cross-linked using epoxy chemistry. The result is a magnetic nanoparticle component that is covalently linked and well separated. By using this ‘matrix-free’ approach, we can substantially increase the magnetic nanoparticle fraction, while still maintaining good separation, leading to a superparamagnetic nanocomposite with strong magnetic properties.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1444097
Report Number(s):
SAND-2018-5581J
Journal ID: ISSN 0884-2914; 663407
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Volume: 33; Journal Issue: 15; Journal ID: ISSN 0884-2914
Publisher:
Materials Research Society
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; composite; magnetic; nanostructure

Citation Formats

Watt, John Daniel, Bleier, Grant C., Romero, Zachary William, Hance, Bradley G., Bierner, Jessica Anne, Monson, Todd C., and Huber, Dale L. Gram scale synthesis of Fe/FexOy core–shell nanoparticles and their incorporation into matrix-free superparamagnetic nanocomposites. United States: N. p., 2018. Web. doi:10.1557/jmr.2018.139.
Watt, John Daniel, Bleier, Grant C., Romero, Zachary William, Hance, Bradley G., Bierner, Jessica Anne, Monson, Todd C., & Huber, Dale L. Gram scale synthesis of Fe/FexOy core–shell nanoparticles and their incorporation into matrix-free superparamagnetic nanocomposites. United States. https://doi.org/10.1557/jmr.2018.139
Watt, John Daniel, Bleier, Grant C., Romero, Zachary William, Hance, Bradley G., Bierner, Jessica Anne, Monson, Todd C., and Huber, Dale L. Tue . "Gram scale synthesis of Fe/FexOy core–shell nanoparticles and their incorporation into matrix-free superparamagnetic nanocomposites". United States. https://doi.org/10.1557/jmr.2018.139. https://www.osti.gov/servlets/purl/1444097.
@article{osti_1444097,
title = {Gram scale synthesis of Fe/FexOy core–shell nanoparticles and their incorporation into matrix-free superparamagnetic nanocomposites},
author = {Watt, John Daniel and Bleier, Grant C. and Romero, Zachary William and Hance, Bradley G. and Bierner, Jessica Anne and Monson, Todd C. and Huber, Dale L.},
abstractNote = {In this paper, significant reductions recently seen in the size of wide-bandgap power electronics have not been accompanied by a relative decrease in the size of the corresponding magnetic components. To achieve this, a new generation of materials with high magnetic saturation and permeability are needed. Here, we develop gram-scale syntheses of superparamagnetic Fe/FexOy core–shell nanoparticles and incorporate them as the magnetic component in a strongly magnetic nanocomposite. Nanocomposites are typically formed by the organization of nanoparticles within a polymeric matrix. However, this approach can lead to high organic fractions and phase separation; reducing the performance of the resulting material. Here, we form aminated nanoparticles that are then cross-linked using epoxy chemistry. The result is a magnetic nanoparticle component that is covalently linked and well separated. By using this ‘matrix-free’ approach, we can substantially increase the magnetic nanoparticle fraction, while still maintaining good separation, leading to a superparamagnetic nanocomposite with strong magnetic properties.},
doi = {10.1557/jmr.2018.139},
journal = {Journal of Materials Research},
number = 15,
volume = 33,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2018},
month = {Tue May 15 00:00:00 EDT 2018}
}

Journal Article:
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Cited by: 8 works
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Figures / Tables:

FIG. 1 FIG. 1: Schematic showing the as-synthesized matrix-free superparamagnetic nanocomposite. Fe/FexOy core-shell magnetic nanoparticles are synthesized using trioctylphosphine (TOP) and oleylamine (OLA) as surfactants. A ligand exchange procedure is then performed in-situ, attaching an alkyl chain diamine to the nanoparticle surface. The amine expressed superparamagnetic nanoparticles are then cross-linked with amore » triepoxide, $n$,$n$-digly cidy1-4- glycidyloxy aniline (red). By cross-linking directly to a covalently bound stabilizer species we substantially reduce the amount of organic fraction in the nanocomposite when compared to polymer matrices and increase the packing fraction of the magnetic component. The interparticle distance can then be tuned easily by varying the alkyl chain length of the diamine.« less

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