Abstract-There is increasing interest in electromagnetic interference (EMI) shielding due to the serious electromagnetic environment pollution caused by the continuously increased use of the electrical products and electronic devices. Electrical conductivity and EMI shielding effectiveness (SE) of composite materials made from silicone rubber with carbon powder and ferrite powder have been studied in microwaves and terahertz frequency ranges and the results are presented in this paper. In microwaves range, samples with higher electrical conductivity show a small variation of shielding performance with frequency, whereas the performance of samples with lower conductivity falls away with increasing frequency. It is shown that the variation of attenuation with frequency relates to the conductivity of the material.
High magnetization Fe3O4/OA-FeCo/Al2O3 nanocomposite magnetic clusters have been obtained by a modified oil-in-water miniemulsion method. These nanocomposite clusters dispersed in a ferrofluid carrier results in a magnetorheological fluid with improved...
Electrospinning is one of the methods for obtaining nano/microfibers, using polymeric solutions. These nanofibrous
membranes are highly porous with interconnected pores, having high specific surface area and small pore size, making
them a suitable candidate for filtration applications. The properties of electrospun fibers are influenced by polymer
solution, solvent, solution concentration, viscosity, electrical conductivity, electrical voltage, spinneret to collector
distance etc. Expanded polystyrene is a polymeric product that is usually used for insulation and packaging. Recycling
expanded polystyrene into nanofibers with applications in filtration could be useful from an economic point of view. The
purpose of this study was to investigate the influence of expanded polystyrene polymer solution characteristics
(concentration, viscosity) and the process parameters (applied voltage, distance between the tip and the collector plate,
flow rate of the polymer solution) on the morphology and the properties of the obtained electrospun fibers. Therefore,
three EPS solutions with 10, 15 and 20% wt. concentration were prepared and were electrospun under processing
conditions with an applied voltage of 12, 15 and 18 kV, a spinneret-to-collector distance of 20 cm, a flow rate of solution
of 1.5 and 2 mL/hour, a spinneret diameter of 0.8 mm and stationary copper substrate. The morphology of the
electrospun fibers was observed by scanning electron microscopy. The mechanical properties were evaluated by tensile
strength and elongation tests.
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