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- W4387409186 abstract "A sandwich structure of carbon-epoxy laminate with graphene nanoplatelets is used for increasing the AC conductivity, dielectric constant and sensitivity towards moisture. The Quasi Fickian distribution of moisture absorption of epoxy is retained with the inclusion of carbon fibers and graphene nanoplatelets of 1 weight percent. The effect of relative humidity (RH) over a range of 30 to 90% on AC conductivity and capacitance has been investigated. Use of carbon fibers with graphene nanoplatelets significantly enhances the electrical conductivity and dielectric constant as compared to carbon-epoxy laminate without graphene nanoplatelets. The two parameters reveal linear dependence on humidity in the low frequency range of 100 to 1000 Hz. The AC conductivity increases at the rate of 2 nSm-1/% RH in laminate with carbon fiber and it increases to 50 nSm-1/%RH with the incorporation of graphene nanoplatelets. The increase in AC conductivity from 100 Hz to 1000 Hz is in the range of 0.1 to 0.2μS/m with carbon fibers and it increases from1 to 4 μS/m with the inclusion of graphenenanoplatelets. Increase is AC conductivity from 1 kHz to 10 MHz is by five orders of magnitude, with a steep increase around 5 MHz in both laminates. The incorporation of graphenenanoplatelets helps to increase the dielectric constant by 2.4 to 2.8 times as compared to epoxy with carbon fiber. The swelling in the laminates estimated after 96 hours of exposure to 90% RH is observed to be less than 0.05%. The use of graphenenanoplatelets improves moisture sensitivity of the carbon-epoxy laminate." @default.
- W4387409186 created "2023-10-07" @default.
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- W4387409186 date "2023-10-01" @default.
- W4387409186 modified "2023-10-08" @default.
- W4387409186 title "Carbon-graphene-epoxy sandwich dielectric for improved dielectric response to humidity" @default.
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- W4387409186 doi "https://doi.org/10.1016/j.jmrt.2023.09.322" @default.
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