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Structure and Electromagnetic Properties of Cellular Glassy Carbon Monoliths with Controlled Cell Size

1
Université de Lorraine, CNRS, IJL, F-88000 Epinal, France
2
Center of New Technologies, University of Warsaw, Banacha 2c, 02097 Warsaw, Poland
3
Research Institute for Nuclear Problems of Belarusian State University, Bobruiskaya Street 11, 220030 Minsk, Belarus
4
Faculty of Physics, Vilnius University, Sauletekio 9, LT-10222 Vilnius, Lithuania
5
Department of Radiophysics, Tomsk State University, 36 Lenin Prospekt, 634050 Tomsk, Russia
*
Author to whom correspondence should be addressed.
Materials 2018, 11(5), 709; https://doi.org/10.3390/ma11050709
Received: 4 April 2018 / Revised: 24 April 2018 / Accepted: 28 April 2018 / Published: 1 May 2018
(This article belongs to the Special Issue Electromagnetic Wave Absorbing Structures)
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Abstract

Electromagnetic shielding is a topic of high importance for which lightweight materials are highly sought. Porous carbon materials can meet this goal, but their structure needs to be controlled as much as possible. In this work, cellular carbon monoliths of well-defined porosity and cell size were prepared by a template method, using sacrificial paraffin spheres as the porogen and resorcinol-formaldehyde (RF) resin as the carbon precursor. Physicochemical studies were carried out for investigating the conversion of RF resin into carbon, and the final cellular monoliths were investigated in terms of elemental composition, total porosity, surface area, micropore volumes, and micro/macropore size distributions. Electrical and electromagnetic (EM) properties were investigated in the static regime and in the Ka-band, respectively. Due to the phenolic nature of the resin, the resultant carbon was glasslike, and the special preparation protocol that was used led to cellular materials whose cell size increased with density. The materials were shown to be relevant for EM shielding, and the relationships between those properties and the density/cell size of those cellular monoliths were elucidated. View Full-Text
Keywords: cellular monoliths; glasslike carbon; porosity; electrical conductivity; permittivity; electromagnetic properties cellular monoliths; glasslike carbon; porosity; electrical conductivity; permittivity; electromagnetic properties
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Szczurek, A.; Fierro, V.; Plyushch, A.; Macutkevic, J.; Kuzhir, P.; Celzard, A. Structure and Electromagnetic Properties of Cellular Glassy Carbon Monoliths with Controlled Cell Size. Materials 2018, 11, 709.

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