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On the origin of the electrical response of vapor grown carbon nanofiber + epox...
Silva, J.; Cardoso, P.; Paleo, A.J.; van Hattum, F. W. J.; Simões, Ricardo; Lanceros-Méndez, S.The origin of the electrical response of vapor grown carbon nanofiber (VGCNF) + epoxy composites is investigated by studying the electrical behavior of VGCNF with resin, VGCNF with hardener and cured composites, separately. It is demonstrated that the onset of the conductivity is associated to the emergence of a weak disorder regime. It is also shown that the weak disorder regime is related to a hopping dependi...
Temperature dependence of the electrical conductivity of vapor grown carbon nan...
Cardoso, P.; Silva, J.; Agostinho Moreira, J.; Klosterman, D.; van Hattum, F.W.J.; Simões, Ricardo; Lanceros-Mendez, S.The influence of the dispersion of vapor grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/epoxy composites has been studied. A homogeneous dispersion of the VGCNF does not imply better electrical properties. The presence of well distributed clusters appears to be a key factor for increasing composite conductivity. It is also shown that the main conduction mechanism has an ionic nature for c...
The role of disorder on the AC and DC electrical conductivity of vapour grown c...
Cardoso, P.; Silva, J.; Klosterman, D.; Covas, J.A.; van Hattum, F.W.J.; Simões, RicardoFour dispersion methods were used for the preparation of vapour grown carbon nanofibre (VGCNF)/epoxy composites. It is shown that each method induces certain levels of VGCNF dispersion and distribution within the matrix, and that these have a strong influence on the composite electrical properties. A homogenous VGCNF dispersion does not necessarily imply higher electrical conductivity. In fact, it is concluded ...
The influence of the dispersion method on the electrical properties of vapor-gr...
Cardoso, Paulo; Silva, J.; Klosterman, Donald; Covas, José A.; van Hattum, F.W.J.; Simões, Ricardo; Lanceros-Mendez, SenentxuThe influence of the dispersion of vapor-grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/ Epoxy composites has been studied. A homogenous dispersion of the VGCNF does not imply better electrical properties. In fact, it is demonstrated that the most simple of the tested dispersion methods results in higher conductivity, since the presence of well-distributed nanofiber clusters appears to be...
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