Abstract
Infrared volume extinction coefficients have been theoretically calculated for high aspect ratio carbon microparticles and nanoparticles. Two principal types of carbon material were modelled: layered crystalline graphite and microcrystalline graphite. The infrared extinction performance of each material was assessed and compared for two high aspect ratio particle geometries, thin lamellar flakes and acicular fibres. Optimum dimensions for both geometries of each material for maximum volume efficient extinction performance have been identified. The volume extinction coefficient calculations were performed using the finite difference time domain method (FDTD), the T-matrix method (TMM) and the infinite cylinder solution (ICS). Phase functions were calculated for all particle geometries and morphologies modelled. Transmission calculations were also performed using the six-flux method of radiative transfer. Finally, an attempt was made to compare the theoretical calculations to an experimental measurement.
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