Cement nanocomposite with CoFe2O4 nanoparticles and graphite flakes for microwave absorption in X-band frequency

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26232511%3A_____%2F26%3AN0000007" target="_blank" >RIV/26232511:_____/26:N0000007 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2352710226005462" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2352710226005462</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jobe.2026.115725" target="_blank" >10.1016/j.jobe.2026.115725</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Cement nanocomposite with CoFe2O4 nanoparticles and graphite flakes for microwave absorption in X-band frequency

Popis výsledku v původním jazyce

This study reports the microwave absorption in cementitious composites through the incorporation of graphite flakes (GF) and ultrasonically synthesized spherical cobalt ferrite (CoFe2O4) nanoparticles (CF). Composites with 2.5 wt% GF and 7.5 wt% CF were prepared and characterized for their structural, magnetic, mechanical, and electromagnetic properties. The phase purity of CF nanoparticles and the presence of fillers in the cement matrix were confirmed by Xray diffraction (XRD). The morphology, distribution, and interfacial interactions between the fillers and the cement matrix were examined using field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). Magnetic hysteresis loops revealed a saturation magnetization of 5.8 emu/g for the cement nanocomposite, confirming the retention of some magnetic behaviour of CF in cement matrix. The results demonstrated excellent microwave absorption performance in X-band range, with a minimum reflection loss (RLmin) of-41.9 dB at 10.59 GHz and an effective absorption bandwidth (EAB) of 2.4 GHz (below-10 dB) at a thickness of only 2 mm, corresponding to microwave absorption efficiency of 99.994%. The obtained microwave absorption performance is attributed to the synergistic effects of permittivity and permeability, favourable impedance matching, and high attenuation constant due to the combined dielectric loss from GF and magnetic loss from CF. Despite a slight reduction in mechanical strength compared to the reference, the composite meets standard structural requirements. This work highlights the potential of using conductive and magnetic nanofillers to develop high-performance cementitious composites for X-band microwave absorption applications.

Název v anglickém jazyce

Cement nanocomposite with CoFe2O4 nanoparticles and graphite flakes for microwave absorption in X-band frequency

Popis výsledku anglicky

This study reports the microwave absorption in cementitious composites through the incorporation of graphite flakes (GF) and ultrasonically synthesized spherical cobalt ferrite (CoFe2O4) nanoparticles (CF). Composites with 2.5 wt% GF and 7.5 wt% CF were prepared and characterized for their structural, magnetic, mechanical, and electromagnetic properties. The phase purity of CF nanoparticles and the presence of fillers in the cement matrix were confirmed by Xray diffraction (XRD). The morphology, distribution, and interfacial interactions between the fillers and the cement matrix were examined using field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). Magnetic hysteresis loops revealed a saturation magnetization of 5.8 emu/g for the cement nanocomposite, confirming the retention of some magnetic behaviour of CF in cement matrix. The results demonstrated excellent microwave absorption performance in X-band range, with a minimum reflection loss (RLmin) of-41.9 dB at 10.59 GHz and an effective absorption bandwidth (EAB) of 2.4 GHz (below-10 dB) at a thickness of only 2 mm, corresponding to microwave absorption efficiency of 99.994%. The obtained microwave absorption performance is attributed to the synergistic effects of permittivity and permeability, favourable impedance matching, and high attenuation constant due to the combined dielectric loss from GF and magnetic loss from CF. Despite a slight reduction in mechanical strength compared to the reference, the composite meets standard structural requirements. This work highlights the potential of using conductive and magnetic nanofillers to develop high-performance cementitious composites for X-band microwave absorption applications.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20100 - Civil engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2026

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Building Engineering

ISSN

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e-ISSN

2352-7102

Svazek periodika

121

Číslo periodika v rámci svazku

MAR 1 2026

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

17

Strana od-do

—

Kód UT WoS článku

001708780700001

EID výsledku v databázi Scopus

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