Dielectric Properties of Epoxy Composites containing both Molecular and Nanoparticulate Silica

International audienc

Dielectric design of LDPE properties: With the help of double-core Si/SiO<inf>2</inf> and Carbon Black

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 controlling the electrical charge movement (via SiO2). Silicon was used in conjunction with Carbon Black (CB) and produced, upon some conditions, enlarged dielectric storage yet with intempestive conversion to a conducting state. At low voltage, LDPE containing 5 wt% CB and 3% or 0.25% Si remained insulating materials. During breakdown conditions with a 2 kV/s rise, only the composite containing 0.25 wt% CB and 3 wt% Si exhibited insulating conditions. These results draw attention to the importance of performing material system evaluation under dynamical conditions

An overview of manganese recovery by Hydro and Pyro-Metallurgical routes

This review comprises of information about the recovery of manganese through leaching and carbothermic reduction routes. In industrial processes, various critical parameters such as ore size, temperature, pressure, gas atmosphere and ore composition etc. affect the reduction or recovery of Mn from ores. Authors have tried to bring those critical parameters in this review which is currently being considered as important industrial parameters for Mn ore processing. This paper deals with both pyro-metallurgical and hydro-metallurgical routes for Mn ore reduction and gives brief summary about the critical parameters.by Deepak Dwivedi, Navneet Singh Randhawa, Sanjay Saroj and Ranjeet Kumar Jan