Low temperature magnetic properties and electromagnetic interference shielding effectiveness of PDMS composites

Shetty, HD and Patra, A and Prasad, V (2021) Low temperature magnetic properties and electromagnetic interference shielding effectiveness of PDMS composites. In: Journal of Magnetism and Magnetic Materials, 525 .

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Abstract

This paper presents the preparation and characterization of Polydimethylsiloxane (PDMS) composites with Carbon encapsulated iron nano particles (CEFeNPs). The mutual interactions between the CEFeNPs and PDMS were studied by Raman Spectroscopy and Scanning electron microscopy. Structural characterization on the flexible composite films and CEFeNPs was carried out using X-ray diffractometer. Transmission electron microscopy (TEM) revealed the structure of CEFeNPs, with an iron core enveloped by 5 nm thick layer of graphitic carbon. The main goal of this work was to investigate the influence of temperature on magnetic properties of composites by applying a magnetic field ranging from �1.5 to 1.5 Tesla at 10 K, 100 K and 300 K. The saturation magnetization, retentivity, coercivity and squareness ratio found to improve with increase in filler loading and by lowering temperature. For 50 wt composite of 250 μm thickness, the electromagnetic interference shielding effectiveness (EMI SE) is found to be 21.925 dB at 8 GHz. The shielding performance of cured composites enhanced by increasing the thickness of the sample and for 1.5 mm thick film of 50 wt, an EMI SE of 27.1 dB was obtained at 8 GHz. © 2020 Elsevier B.V.

Item Type:	Journal Article
Publication:	Journal of Magnetism and Magnetic Materials
Publisher:	Elsevier B.V.
Additional Information:	The copyrights of this article belong to Elsevier B.V.
Keywords:	Carbon; Composite films; Composite structures; Electromagnetic pulse; Electromagnetic wave interference; High resolution transmission electron microscopy; Iron; Iron metallography; Magnetic properties; Magnetic shielding; Microchannels; Nanoparticles; Polydimethylsiloxane; Saturation magnetization; Scanning electron microscopy; Signal interference; Silicones; Temperature; Thick films, Carbon-encapsulated; Electromagnetic interference shielding effectiveness; Flexible composites; Polydimethylsiloxane PDMS; Properties of composites; Shielding performance; Structural characterization; X ray diffractometers, Electromagnetic shielding
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	23 Dec 2021 10:23
Last Modified:	23 Dec 2021 10:23
URI:	http://eprints.iisc.ac.in/id/eprint/67784

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