@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 = "25 jun. 2024"
}