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Metamaterials based on polymer dispersions of nanoparticles and particles of copper obtained by cathodic current pulse electrolysis

Łoś P., Łukomska A., Kowalska S., Jeziórska R., Zaprzalski P., Krupka J.

Materials Science Poland

2011

Vol. 29, No. 1

35--40

In the present paper a novel group of electromagnetic metamaterials as well as the method of their fabrication is presented. The studied metamaterials are polymer composites and nanocomposites made of polymer matrix/host (ethylene-vinyl acetate (EVA), polyethylene, polypropylene etc.) filled with copper flakes, of micrometer and/or nanometer size, as the conducting inclusions. The copper filler flakes were obtained by cathodic current pulse electrolysis from copper sulfate electrolytes at the stainless steel electrodes. SEM analysis showed that the morphology and structure of the copper deposit can be precisely controlled by applying different kind of current pulse and reversed current pulsed electrolysis. The polymer composite metamaterials formed by extrusion of small beads of polymer mixed with the copper flakes consisted of polymer matrix and copper flakes, ranging in length from 1 to 500 micrometers, and ranging in thickness from 80 nm to 2000 nm. The concentration of the copper flakes ranged from 0.5 wt% to 40 wt%, depending on the applications and required electromagnetic and mechanical properties. The studied materials were found to exhibit effective magnetic permeability that was smaller than unity, which is indicative of the typical properties of metamaterials. Present development solves technological and economical problems related to modern microelectronics methods which are currently mainly used for metamaterial fabrication.

Electret properties of polyethylene films with nano-dimension inclusions of Si02.

Bordovsky G. A., Gorokhovatsky Y., Temnov E.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

2007

Vol. 46, nr 19

194-197

The electret properties of polyethylene films with 100-200 /xm thickness and nano-dimension inclusions of Si02 are investigated. The comparative study of electret properties of polymer films on the basis of polyethylene with inclusions and without them is carried out. It is stated that the introduction of Si02 into the volume of polymer results in considerable improvement of the electret state stability of polyethylene films. Using the thermally stimulated relaxation of potential method the parameters of the electrically active defects in the polymer with Si02 inclusions are determined.