Nanocomposites and nanomaterials

Face-centered cubic packing model for microwave properties of segregated structures
Lazarenko O.A., Lozitsky O.V., Vovchenko L.L., Matzui L. Yu.
Department of Physics, Taras Shevchenko National University of Kyiv.
64/13, Volodymyrska Street, City of Kyiv, Ukraine, 01601
E-mail: alazar@univ.kiev.ua

Segregated composite materials have proven to be an effective way of creating superior shielding materials, conductors, sensors and anti-static coatings while being cheap, easy to produce, and with good mechanical strength. The coating of carbon nanotubes on polyethylene surface has been demonstrated to produce segregated structures with good electrical and mechanical properties [1].
This work discusses the novel method of modeling of segregated structure shielding of the polymer spheres, coated with carbon nanoparticles. The model proposed in [2] for a heterostructure based on a monolayer of hollow glassy carbon spheres packed in 2D lattice has been used as a base. Our model assumes that the polymer spheres form HCP-like structure in the composite with carbon nanoparticles located in-between the spheres. The effect of polymer particles size and carbon content on absorption spectra of the composites has been investigated. The model also considers that the polymer particles may be spaced a certain distance away which is defined by the content of the carbon. The modeling results were found to agree satisfactory with the measured shielding spectra. Thus, the controllable parameters of the material (sphere size and carbon content) may allow it to achieve superior microwave absorption properties.

1.	Tang J, Ye F, Xie Y, Liu P. Improved mechanical and electromagnetic interference shielding performance of segregated UHMWPE/CNTs via microwave-assisted sintering. High Performance Polymers. 2020;32(10):1140-1149.
2.	D. Bychanok, S. Li, A. Sanchez-Sanchez, G. Gorokhov, P. Kuzhir et al.
Hollow carbon spheres in microwaves: Bio inspired absorbing coating //
Appl. Phys. Lett.  – 2016. – 108. - 013701.