L. Salome

Bio: L. Salome is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Dielectric & Epoxy. The author has an hindex of 2, co-authored 2 publications receiving 13 citations.

Electrical properties of carbon black-epoxy resin heterogeneous materials near the percolation threshold

Abstract: Summary The electrical properties of carbon black-epoxy resin composite materials were studied in the frequency range between 100 Hz and 15 Mhz. We have determined the critical exponents which describe the behaviours of conductivity and of the dielectric constant, near the percolation threshold, as functions of the frequency. The experimental values of the critical exponents are in agreement with those given in the literature.

Conductive SU8 Photoresist for Microfabrication

Abstract: A conductive composite photoresist has been developed for the direct photopatterning of electrodes. It is based on a dispersion of silver nanoparticles in SU8, a non-conductive, negative-tone photoresist. Manufactured structures have an electrical conductivity at a low silver content of around 6 vol.-%

Microwave properties of carbon black–epoxy resin composites and their simulation by means of mixture laws

Abstract: This article reports on a study of the dielectric properties of carbon black dispersions in an insulating epoxy matrix at microwave frequencies. Measurements showed that the complex permittivity of the composites depends strongly on the nature and concentrations of the conducting medium. The experimental values of the complex permittivity were compared to those obtained by using different mixing laws. We show that effective medium theories correctly account for the experimental results at low conducting particle concentrations. At concentrations higher than a few percent, these laws fail to interpret experimental results and all tentative results must take into account parameters such as the particle size, their distribution, and the existence of agglomerates. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 969–973, 1999

Electrical properties of multi walled carbon nanotubes/ poly(vinylidene fluoride/trifluoroethylene) nanocomposites

Abstract: Poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE)/multi-walled carbon nanotube (MWCNT) nanocomposites were prepared by the method of solution mixing/casting. The dispersity of the MWCNTs in the PVDF-TrFE matrix was investigated using transmission electron microscopy (TEM), revealing that MWCNT are well distributed in the PVDF matrix. Both individual and agglomerations of MWCNT’s were evident. The electrical properties were characterized by ac conductivity measurements. The conductivity was found to obey a percolation-like power law with a percolation threshold below 0.30 wt. %. The electrical conductivity of the neat PVDF-TrFE could be enhanced by seven orders of magnitude, with the addition of only 0.3 wt. % MWCNTs, suggesting the formation of a well-conducting network by the MWCNT’s throughout the insulating polymer matrix. The intercluster polarization and anomalous diffusion models were used to explain the dielectric behaviors of the composites near the percolation threshold, and the analyses of ac conductivity and dielectric constant imply that the intercluster polarization is more applicable to our systems.