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Low-density Polyethylene (LDPE) was modified by using simultaneously 2 additives. Each additive had a specific attribute. Silicon was used. Using TEM with EELS, it was proved first that the passivated version constituted a double core consisting of Si surrounded by a nanometric layer of amorphous Silica (SiO2). Thus Si brought the possibility of an enlarged dielectric storage capacity with a barrier...
Dielectric properties of epoxy composites containing both molecular and nanoparticulate silica were studied. The comparative dielectric study consisted in comparing neat epoxy and composites containing 1 wt% of nanosilica and both 1 wt% of nanosilica and G-POSS. After establishing the respective expected behavior of the basic composites, experiments have shown that the performance of the composite...
In this paper, the effect of nature and preparation method of two different functionalized graphenes on the dielectric properties of Low Density Polyethylene (LDPE)/Graphene composites was investigated. The first type of composites contains only a single additive, a multilayer graphene purchased from an industrial supplier. The second type of composites was multiphase composites, where another type...
Epoxy/PAni composite films were prepared with 1 and 5 wt% of various additives: PAni powder only, epoxy powder surrounded by PAni (epoxy-PAni) and PAni powder surrounded by epoxy (PAni-epoxy). Results of dielectric relaxation spectroscopy showed that with 1 wt% of filler content in epoxy resin, irrespective of the type of additives, the value of AC-conductivity was increased by at least one order...
Controlling the interface has always been a challenge when designing a new type of nanocomposite. In this work, an innovative approach is proposed. It starts with depositing a 60-nm thick silica layer on a PE substrate, using a sol-gel method. This layered object is further covered by thermally pressing over it a sheet of PE. The thus obtained composite is indented into small building blocks which...
This paper presents a method for correcting digital image artifacts that appear in images acquired by digital cameras caused by flash light reflection on out of focus airborne particles. This method makes use of polar coordinates representation of artifacts and it is assumed that they were previously detected.
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