@Article{RamlowSilLopBalMac:2022:ExCoMo,
author = "Ramlow, Heloisa and Silva, Liangrid Lutiani da and Lopes, Braulio
Haruo Kondo and Baldan, Maur{\'{\i}}cio Ribeiro and Machado,
Ricardo",
affiliation = "{Universidade Federal de Santa Catarina (UFSC)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidade Federal de Santa Catarina
(UFSC)}",
title = "SiCN fibers as advanced materials for electromagnetic shielding in
X-band: experiments and computational modelling and simulation",
journal = "Computer-Aided Chemical Engineering",
year = "2022",
volume = "1",
pages = "199--204",
note = "PROCEEDINGS OF THE 32nd European Symposium on Computer Aided
Process Engineering (ESCAPE32), June 12-15, 2022, Toulouse,
France",
keywords = "complex electrical permittivity, polymer-derived ceramic, radar
crosssection, reflection loss, shielding effectiveness.",
abstract = "Materials prepared via the polymer-derived ceramic route have been
increasingly studied for protection against electromagnetic energy
to mitigate electromagnetic interference. Both experimental and
computational evaluations of electrospun SiCN fibers applied to
electromagnetic shielding are not yet reported in the literature.
This work aims to evaluate the electromagnetic properties of SiCN
electrospun fibers by experiments and computational modelling and
simulation. Polysilazane and polyacrylonitrile were used
respectively as the ceramic precursor and spinning aid. After
electrospinning, the fibers were pyrolyzed at 1000 °C. The samples
were named SiCN_0, SiCN_40, and SiCN_70 respectively for 0, 40,
and 70 wt.% polyacrylonitrile. The scattering parameters,
impedances, and reflection losses were collected under X-band
(8.2-12.4 GHz) in a vector network analyzer employing the
waveguide propagation setup. The experimental scattering
parameters were converted through the Nicolson-Ross-Weir method
together with the shielding effectiveness and numerical
electromagnetic computational studies. Simulations of scattering
parameters were performed, and introductory electromagnetic
scattering calculations in free space were computed including the
radar cross-section (RCS) study. The relative complex electrical
permittivity was approximately 3, 4.5, and 4 (real part) and 0.05,
0.22, and 0.1 (imaginary part) respectively for SiCN_0, SiCN_40,
and SiCN_70. The SiCN_40 could experimentally store and lose more
electromagnetic energy in the material, exhibiting a minimum
reflection coefficient of -1.4 dB at 12.4 GHz. The computational
simulation corroborated the better performance of SiCN_40 in
reflection loss as well as in other electromagnetic spectral
responses. Additionally, correlations between electromagnetic
properties extracted from experiments and computational results
from the RCS study were observed. The free space electromagnetic
scattering of SiCN_40 showed better features when compared to the
other samples. Owing to the microstructure and product design,
SiCN_40 fibers demonstrated satisfying electromagnetic shielding
properties in X-band. The computational experiments showed to be a
new modelling and simulation approach to evaluate the
electromagnetic properties of electrospun SiCN fibers. Further
research will focus on material optimization and computational
evaluation.",
doi = "10.1016/B978-0-323-95879-0.50034-5",
url = "http://dx.doi.org/10.1016/B978-0-323-95879-0.50034-5",
issn = "1570-7946",
label = "lattes: 0035452810990839 2 RamlowSilLopBalMac:2022:ExCoMo",
language = "en",
targetfile = "Ramlow_ESCAPE32full-paperreviewed.pdf",
urlaccessdate = "14 jun. 2024"
}