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Evaluates thermal conductivity and electrical resistivity in alumina/epoxy composites, suggesting improved properties with silica@MWNT.
This study examines the thermal conductivity and electrical resistivity of alumina/epoxy resin composites with silica layered multi-walled carbon nanotubes (silica@MWNT). The silica@MWNT was synthesized by using a sol-gel method, and the alumina/epoxy resin composites with silica@MWNT were fabricated by a planetary centrifugal mixer. Using the manufactured composites, thermal conductivity and electrical resistivity were measured. As a result of these tests, the thermal conductivity of the 1.8wt% silica@MWNT/alumina/epoxy resin composites was lower than that of the composites with 1.8wt% MWNT, but the thermal conductivity of the 5.4wt% silica@MWNT/alumina/epoxy resin composites was higher than that of the composites with 5.4wt% MWNT. This suggests that the synergistic effect of adding silica@MWNT with alumina improves as the content of silica@MWNT increases. The electrical resistivity of the 1.8wt% silica @ MWNT/epoxy resin composites was higher than that of the 1.8wt% MWNT/epoxy resin composites and was comparable to that of the neat epoxy resin. The electrical resistivity of the 1.8wt% silica@ MWNT/alumina/epoxy resin composites was nearly the same as that of the alumina/epoxy resin composites and the 1.8wt% MWNT/alumina/epoxy resin composites. However, the electrical resistivity of the 5.4wt% silica@ MWNT/alumina/epoxy resin composites showed a higher value than that of the 5.4wt% MWNT/alumina/epoxy resin composites, thereby demonstrating enhanced electrical insulating properties.
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FUKUTA et al. (2026) studied this question.
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