Publications by authors named "Marina Tretjak"
We present studies on the microwave properties, electrical resistivity, and low-frequency (10 Hz-20 kHz) noise characteristics in the temperature range of 78 K to 380 K of composite materials made from bisphenol A-based epoxy resin and carbon fiber felts. Two types of carbon fibers were used, derived from polyacrylonitrile or regenerated cellulose. We show that these structures are suitable for electromagnetic shielding applications, especially in the direction parallel to the carbon fibers.
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- Polymer matrix composites filled with carbon nanoparticles, such as onion-like carbon (OLC), have varying electrical properties influenced by the size and distribution of the particles in the epoxy resin matrix.
- The study examines the electrical resistivity and voltage fluctuations in these composites at temperatures from 78 to 380 K, highlighting different electrical transport mechanisms that occur at varying temperatures.
- Results show that smaller particles (40 nm) lead to quasi one-dimensional electrical transport, while larger particles (220-250 nm) exhibit higher dimensionality; additionally, the conductivity of smaller particle composites is more affected by thermal expansion of the matrix.