Topical Collection "Applications of Magnetic Nanomaterials"

Editor

Guest Editor
Prof. Yurii K. Gun'ko

School of Chemistry, Trinity College Dublin, Dublin 2, Ireland
Website | E-Mail
Interests: quantum dots; magnetic nanomaterials; carbon nanomaterials; nano-bio-technology; biological imaging

Topical Collection Information

Dear Colleagues,

Magnetic nanomaterials represent one of the most important and emerging classes of materials in nanotechnology due to a range of potential applications. These nanomaterials are used in magnetic data storage, catalysis, magnetic separation, sensing, waste water treatment, and in various biomedical applications. For example, magnetic nanoparticles have been utilized as contrast agents for magnetic resonance imaging (MRI). When exposed to an alternating magnetic field, magnetic nanoparticles can serve as powerful heat sources, destroying tumor cells, which enabled to use these nanomaterials in cancer hyperthermia therapy. Magnetic nanomaterials have also been used as drug delivery agents, which can be localized in the body at a site of interest using an external magnetic field.

This collection will be focused on prospective applications of magnetic nanomaterials in materials science, chemistry, physics, biology and medicine.

Prof. Yurii K. Gun'ko
Guest Editor

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Keywords

  • magnetic nanoparticles
  • magnetic data storage
  • magnetic separation
  • sensing
  • catalysis
  • nanomedicine
  • MRI
  • magnetic hyperthermia

Published Papers (7 papers)

2019

Jump to: 2018

Open AccessArticle A Novel Coloration of Polyester Fabric through Green Silver Nanoparticles ([email protected])
Nanomaterials 2019, 9(4), 569; https://doi.org/10.3390/nano9040569
Received: 15 February 2019 / Revised: 10 March 2019 / Accepted: 20 March 2019 / Published: 8 April 2019
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Abstract
This paper reports a novel route for the coloration of polyester fabric with green synthesized silver nanoparticles ([email protected]) using chitosan as a natural eco-friendly reductant. The formation of AgNPs was confirmed by UV-visible spectroscopy. The morphologies and average particles size of G-AgNPs was [...] Read more.
This paper reports a novel route for the coloration of polyester fabric with green synthesized silver nanoparticles ([email protected]) using chitosan as a natural eco-friendly reductant. The formation of AgNPs was confirmed by UV-visible spectroscopy. The morphologies and average particles size of G-AgNPs was investigated by transmission electron microscope (TEM) analysis. The uniform deposition of G-AgNPs on the PET fabric surface was confirmed with scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. The thermal properties were investigated using a thermogravimetric analyzer (TGA). The coloration and fastness properties of fabric were found to be significantly improved, a result related to the surface plasmon resonance of G-AgNPs. The antibacterial properties of fabric were also found to be excellent as more than 80% bacterial reduction was noticed even after 10 washing cycles. Overall, the proposed coating process using green nanoparticles can contribute to low-cost production of sustainable textiles. Full article
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Open AccessArticle Correlation Between Composition and Electrodynamics Properties in Nanocomposites Based on Hard/Soft Ferrimagnetics with Strong Exchange Coupling
Nanomaterials 2019, 9(2), 202; https://doi.org/10.3390/nano9020202
Received: 17 January 2019 / Revised: 29 January 2019 / Accepted: 1 February 2019 / Published: 4 February 2019
Cited by 2 | PDF Full-text (5174 KB) | HTML Full-text | XML Full-text
Abstract
In this work, Sr0.3Ba0.4Pb0.3Fe12O19/(CuFe2O4)x (x = 2, 3, 4, and 5) as strongly exchange-coupled nanosized ferrites were fabricated using a one-pot sol–gel combustion method (citrate sol-gel method). The [...] Read more.
In this work, Sr0.3Ba0.4Pb0.3Fe12O19/(CuFe2O4)x (x = 2, 3, 4, and 5) as strongly exchange-coupled nanosized ferrites were fabricated using a one-pot sol–gel combustion method (citrate sol-gel method). The X-ray diffraction (XRD) powder patterns of the products confirmed the occurrence of pure, exchange-coupled ferrites. Frequency dependencies of the microwave characteristics (MW) were investigated using a co-axial method. The non-linear behavior of the MW with the composition transformation may be due to different degrees of Fe ion oxidation on the spinel/hexaferrite grain boundaries and strong exchange coupling during the hard and soft phases. Full article
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2018

Jump to: 2019

Open AccessArticle Manganese/Yttrium Codoped Strontium Nanohexaferrites: Evaluation of Magnetic Susceptibility and Mossbauer Spectra
Nanomaterials 2019, 9(1), 24; https://doi.org/10.3390/nano9010024
Received: 12 November 2018 / Revised: 15 December 2018 / Accepted: 19 December 2018 / Published: 25 December 2018
Cited by 3 | PDF Full-text (11132 KB) | HTML Full-text | XML Full-text
Abstract
Manganese (Mn)- and yttrium (Y)-substituted Sr-nanohexaferrites (MYSNHFs) of composition Sr1−xMnxFe12−xYxO19 (with 0.0 ≤ x ≤ 0.5) were prepared by citrate sol-gel autocombustion method. As-prepared MYSNHFs were characterized via diverse analytical techniques to determine the [...] Read more.
Manganese (Mn)- and yttrium (Y)-substituted Sr-nanohexaferrites (MYSNHFs) of composition Sr1−xMnxFe12−xYxO19 (with 0.0 ≤ x ≤ 0.5) were prepared by citrate sol-gel autocombustion method. As-prepared MYSNHFs were characterized via diverse analytical techniques to determine the influence of Mn and Y cosubstitution on their microstructures and magnetic properties. 57Fe Mössbauer spectra of the MYSNHFs were used to evaluate the variation in the line width, isomer shift, quadrupole splitting, and hyperfine magnetic field values. It was shown that the dopant ions could preferentially occupy the 12k, 4f2, and 2b sites. Furthermore, the observed shift in the blocking temperatures of the studied MYSNHFs towards lower values with rising Mn2+ and Y3+ contents was attributed to the overall particles size reduction. Meanwhile, the AC susceptibility of the proposed MYSNHFs revealed that the magnetic interactions were weakened with the increase in dopant contents which was ascribed to the replacement of both Sr2+ and Fe3+ ions by the Mn2+ and Y3+ dopants. Full article
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Open AccessArticle Deposition of Magnetite Nanofilms by Pulsed Injection MOCVD in a Magnetic Field
Nanomaterials 2018, 8(12), 1064; https://doi.org/10.3390/nano8121064
Received: 26 September 2018 / Revised: 30 November 2018 / Accepted: 10 December 2018 / Published: 17 December 2018
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Abstract
This report is on the growth of Fe3O4 nanofilms on Al2O3(0001) and MgO(001) substrates with and without the presence of an external magnetic field using a pulsed injection metallorganic chemical vapour deposition (PI MOCVD) technique. The [...] Read more.
This report is on the growth of Fe3O4 nanofilms on Al2O3(0001) and MgO(001) substrates with and without the presence of an external magnetic field using a pulsed injection metallorganic chemical vapour deposition (PI MOCVD) technique. The effects of growing magnetic oxide nanofilms in a 1 T field have been examined using various instrumental methods. It was found that the application of a magnetic field during PI MOCVD does not drastically alter the crystalline texture, surface morphology, and film thickness, but it significantly modifies the Fe3O4 film magnetisation and coercive field. Moreover, it was shown that the application of a 1 T field during the cooling of the sample also improves the magnetic properties. We believe that the large external field orients the magnetic spin structure at high temperatures (during growth or the initial stages of cool down) and that cooling through local magnetic ordering temperatures at Fe3O4 defect sites subsequently favours a ferromagnetic spin alignment. The control of magnetic properties of magnetite nanofilms by the application of magnetic fields during growth opens up new routes towards the fabrication and application of magnetic thin film devices. Full article
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Open AccessArticle Polyelectrolyte-Stabilised Magnetic-Plasmonic Nanocomposites
Nanomaterials 2018, 8(12), 1044; https://doi.org/10.3390/nano8121044
Received: 22 October 2018 / Revised: 26 November 2018 / Accepted: 11 December 2018 / Published: 13 December 2018
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Abstract
In this work, new magnetic-plasmonic nanocomposites have been developed through the use of two complementary polyelectrolytes–polystyrene sulfonate (PSS) and poly(allylamine hydrochloride) (PAH). PSS, a negatively charged polyelectrolyte, was utilized as a stabiliser for magnetite nanoparticles, and PAH, a positively charged polyelectrolyte, was used [...] Read more.
In this work, new magnetic-plasmonic nanocomposites have been developed through the use of two complementary polyelectrolytes–polystyrene sulfonate (PSS) and poly(allylamine hydrochloride) (PAH). PSS, a negatively charged polyelectrolyte, was utilized as a stabiliser for magnetite nanoparticles, and PAH, a positively charged polyelectrolyte, was used to stabilize gold nanoparticles. The combination of these two entities resulted in a magnetic-plasmonic nanocomposite that is highly reproducible and scalable. This approach was found to work for a variety of PSS concentrations. The produced magnetic-plasmonic nanomaterials have been characterized by vibrational sample magnetometry (VSM), transmission electron microscopy (TEM) and UV-Vis spectroscopy. These nanocomposite materials have the potential to be used in a variety of biological applications including bioseparation and biosensing. Full article
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Open AccessArticle High Frequency Hysteresis Losses on γ-Fe2O3 and Fe3O4: Susceptibility as a Magnetic Stamp for Chain Formation
Nanomaterials 2018, 8(12), 970; https://doi.org/10.3390/nano8120970
Received: 21 October 2018 / Revised: 10 November 2018 / Accepted: 21 November 2018 / Published: 24 November 2018
Cited by 2 | PDF Full-text (6286 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
In order to understand the properties involved in the heating performance of magnetic nanoparticles during hyperthermia treatments, a systematic study of different γ-Fe2O3 and Fe3O4 nanoparticles has been done. High-frequency hysteresis loops at 50 kHz carried out [...] Read more.
In order to understand the properties involved in the heating performance of magnetic nanoparticles during hyperthermia treatments, a systematic study of different γ-Fe2O3 and Fe3O4 nanoparticles has been done. High-frequency hysteresis loops at 50 kHz carried out on particles with sizes ranging from 6 to 350 nm show susceptibility χ increases from 9 to 40 for large particles and it is almost field independent for the smaller ones. This suggests that the applied field induces chain ordering in large particles but not in the smaller ones due to the competition between thermal and dipolar energy. The specific absorption rate (SAR) calculated from hysteresis losses at 60 mT and 50 kHz ranges from 30 to 360 W/gFe, depending on particle size, and the highest values correspond to particles ordered in chains. This enhanced heating efficiency is not a consequence of the intrinsic properties like saturation magnetization or anisotropy field but to the spatial arrangement of the particles. Full article
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Open AccessArticle Effect of the Sodium Polyacrylate on the Magnetite Nanoparticles Produced by Green Chemistry Routes: Applicability in Forward Osmosis
Nanomaterials 2018, 8(7), 470; https://doi.org/10.3390/nano8070470
Received: 1 June 2018 / Revised: 22 June 2018 / Accepted: 23 June 2018 / Published: 27 June 2018
Cited by 1 | PDF Full-text (3199 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Aqueous dispersions of magnetic nanocomposites have been proposed as draw electrolytes in forward osmosis. One possible approach for the production of nanocomposites based on magnetite nanoparticles and sodium polyacrylate is the synthesis of the magnetic iron oxide by coprecipitation or oxidative precipitation in [...] Read more.
Aqueous dispersions of magnetic nanocomposites have been proposed as draw electrolytes in forward osmosis. One possible approach for the production of nanocomposites based on magnetite nanoparticles and sodium polyacrylate is the synthesis of the magnetic iron oxide by coprecipitation or oxidative precipitation in the presence of an excess of the polymer. In this work, we explored the effect of the polymer proportion on the nanomaterials produced by these procedures. The materials obtained were compared with those obtained by the coating of magnetite nanocrystals produced beforehand with the same polymer. The samples were characterized by chemical analysis, photon correlation spectroscopy, thermogravimetry, X-ray diffraction, infrared spectroscopy, transmission electron microscopy, and magnetometry. The general trend observed is that the polymers heavily modify the texture of the magnetic material during the synthesis, with a drastic reduction of the particle size and magnetic response. The polycrystalline texture that is generated permits the incorporation of the polymer both on the external surface and in the intergranular space. The aqueous dispersions of the nanocomposites were highly stable, with a hydrodynamic size that was roughly independent of the polymer/magnetite ratio. Such dispersions show an osmotic pressure that is proportional to the concentration of the polymer. Interestingly, the proportionality constant was similar to that of the free polymer only in the case of the samples prepared by oxidative precipitation, being lower in the case of the samples prepared by coprecipitation. Finally, the possibilities of using these materials as draw electrolytes in forward osmosis will be briefly discussed. Full article
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