The impact of MgO nanoparticle interface in ultra-insulating polyethylene nanocomposites for high voltage DC cables

Abstract

Ultra-insulating polyethylene nanocomposites were achieved by appropriate MgO nanoparticle surface modification, resulting in unprecedented dispersion and 2 orders of magnitude lower conductivity.

Reduced and Surface‐Modified Graphene Oxide with Nonlinear Resistivity

“…The EBA composite filled with 0.5 vol% rGO (<φ c ) (“ EBA‐0.5‐rGO ” ) exhibited 10–100 times higher resistivity (≈10 15 Ωm) than neat EBA (Figure a). This effect, observed in previous studies of rGO, zinc oxide, and magnesium oxide NPs, was attributed to the immobilization (“trapping”) of charge carriers in deep traps on the rGO interface. This trapping can be attributed to polar groups or adsorbed water on rGO and has previously been explained by the distribution of charges, the induction of dipoles, and the disruption of polymer crystals by the interfacial region of NPs.…”

Communication: Band bending at the interface in polyethylene-MgO nanocomposite dielectric

“…This choice is due to the fact that it has been experimentally shown to have better dielectric behavior in high-voltage direct current applications as compared to pure polymer material. 11,13,14 These experiments show that the addition of MgO nanoparticles suppresses space charge formation in the material and that the nanocomposite has a higher partial discharge resistance, increased relative permittivity, and decreased conductivity. Despite the fact that bulk magnesium oxide has a relatively simple rock salt cubic crystal structure, its surface is complex and irregular.…”

“…Silicon-treated nanoparticles are less hydrophilic and provide the nanocomposite with a higher resistivity in a humid environment. 11 Ab initio modelling indicated 12 defect states and band bending at the vinylsilanediol-treated SiO 2 -polyvinylidene difluoride interface.…”

Improvement of insulation effectiveness of natural rubber by adding hydroxyl-functionalized barium titanate nanoparticles

“…The addition of small volume fractions of nanofillers can reduce the space charge extent [8], [39], [40] this effect being especially notorious at low filler concentration [41], thus enhancing the volume resistivity. The tendency to suppress charge injection is believed to be due to deep trap mechanisms [42] that capture the charge injected by the electrodes, thus, reducing the electrical conduction [43] by inhibiting charge injection and avoiding space charge buildup. Deep traps are formed because of the interfacial interactions between the organic polymeric matrix and the inorganic nanoparticles, which at the nanoscale range are very strong since nanoparticles exhibit a very high surface area to volume ratio.…”