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Electromagnetic wave absorption properties of Fe/MgO composites synthesized by a simple ultrasonic spray pyrolysis method.

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Title: Electromagnetic wave absorption properties of Fe/MgO composites synthesized by a simple ultrasonic spray pyrolysis method.
Authors: Lim, Hyo-Ryoung1, Jung, Seung-Jae1, Hwang, Tae-Yeon1, Lee, Jimin1, Kim, Ki Hyeon1, Cho, Hong-baek1, Choa, Yong-Ho1 choa15@hanyang.ac.kr
Source: Applied Surface Science. Apr2019, Vol. 473, p1009-1013. 5p.
Subjects: Electromagnetic wave absorption, Iron oxides, Magnesium oxide, Composite materials synthesis, Ultrasonics, Pyrolysis
Abstract: Highlights • Fe/MgO powders are synthesized by USP and subsequent H 2 -reduction methods. • As-pyrolyzed homogeneous Fe 2 O 3 /MgO oxide can serve as individual microreactors. • Remarkable absorption properties of −65.6 dB (at 12 GHz; 1.5 mm) are obtained. • EM absorbers of simple structural design shown with effective dispersion of magnetic fillers. Abstract Electromagnetic (EM) wave absorbing materials consisting of iron (Fe) nanoparticles supported by magnesium oxide (MgO) matrix were synthesized by ultrasonic spray pyrolysis (USP) and subsequent hydrogen reduction. The Fe nanoparticles were formed by the selective reduction of iron oxide in the as-pyrolyzed powder, itself acting as a microreactor, and were successfully embedded in or at the MgO surface, allowing for magneto-dielectric structures without aggregation. Fe content in the composite particles was controlled only by the molar ratio of the precursor solution ([Fe3+]:[Mg2+]). The remarkable shielding effectiveness reached −65.6 dB at 12 GHz with a corresponding thickness of 1.5 mm and an absorption bandwidth for reflection loss (RL) of less than −20 dB is about 7.8 GHz. This design approach can be extended to realize magneto-dielectric materials with tailored absorption frequencies of high bandwidth due to the combination of the well-dispersed decoration of magnetic particles with controlled content and effective insulation. This type of material would be well suited for use in the research community and industry alike due to the reduction in energy required for synthesis and attendant oxidation losses. [ABSTRACT FROM AUTHOR]
Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 134296036
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  Data: Electromagnetic wave absorption properties of Fe/MgO composites synthesized by a simple ultrasonic spray pyrolysis method.
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  Data: <searchLink fieldCode="AR" term="%22Lim%2C+Hyo-Ryoung%22">Lim, Hyo-Ryoung</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Jung%2C+Seung-Jae%22">Jung, Seung-Jae</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Hwang%2C+Tae-Yeon%22">Hwang, Tae-Yeon</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lee%2C+Jimin%22">Lee, Jimin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kim%2C+Ki+Hyeon%22">Kim, Ki Hyeon</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Cho%2C+Hong-baek%22">Cho, Hong-baek</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Choa%2C+Yong-Ho%22">Choa, Yong-Ho</searchLink><relatesTo>1</relatesTo><i> choa15@hanyang.ac.kr</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Surface+Science%22">Applied Surface Science</searchLink>. Apr2019, Vol. 473, p1009-1013. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Electromagnetic+wave+absorption%22">Electromagnetic wave absorption</searchLink><br /><searchLink fieldCode="DE" term="%22Iron+oxides%22">Iron oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Magnesium+oxide%22">Magnesium oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Composite+materials+synthesis%22">Composite materials synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrasonics%22">Ultrasonics</searchLink><br /><searchLink fieldCode="DE" term="%22Pyrolysis%22">Pyrolysis</searchLink>
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  Label: Abstract
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  Data: Highlights • Fe/MgO powders are synthesized by USP and subsequent H 2 -reduction methods. • As-pyrolyzed homogeneous Fe 2 O 3 /MgO oxide can serve as individual microreactors. • Remarkable absorption properties of −65.6 dB (at 12 GHz; 1.5 mm) are obtained. • EM absorbers of simple structural design shown with effective dispersion of magnetic fillers. Abstract Electromagnetic (EM) wave absorbing materials consisting of iron (Fe) nanoparticles supported by magnesium oxide (MgO) matrix were synthesized by ultrasonic spray pyrolysis (USP) and subsequent hydrogen reduction. The Fe nanoparticles were formed by the selective reduction of iron oxide in the as-pyrolyzed powder, itself acting as a microreactor, and were successfully embedded in or at the MgO surface, allowing for magneto-dielectric structures without aggregation. Fe content in the composite particles was controlled only by the molar ratio of the precursor solution ([Fe3+]:[Mg2+]). The remarkable shielding effectiveness reached −65.6 dB at 12 GHz with a corresponding thickness of 1.5 mm and an absorption bandwidth for reflection loss (RL) of less than −20 dB is about 7.8 GHz. This design approach can be extended to realize magneto-dielectric materials with tailored absorption frequencies of high bandwidth due to the combination of the well-dispersed decoration of magnetic particles with controlled content and effective insulation. This type of material would be well suited for use in the research community and industry alike due to the reduction in energy required for synthesis and attendant oxidation losses. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.apsusc.2018.12.222
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Iron oxides
        Type: general
      – SubjectFull: Magnesium oxide
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      – SubjectFull: Composite materials synthesis
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      – SubjectFull: Ultrasonics
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      – SubjectFull: Pyrolysis
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      – TitleFull: Electromagnetic wave absorption properties of Fe/MgO composites synthesized by a simple ultrasonic spray pyrolysis method.
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              Text: Apr2019
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              Y: 2019
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