In recent days, there was a signi¯cant development in the area of nanoparticles and nanoscalē llers on dielectric, thermal and mechanical properties of polymeric materials. The dielectric and thermal properties of standard polyamide and nanoscale-¯lled samples were detailed and analyzed. Carbon nanotubes were used as nano¯llers. Carbon nanotubes were synthesized by chemical vapor deposition (CVD). The basic properties such as dielectric loss tangent (tan ), dielectric constant ("), dielectric strength, partial discharge inception voltage, surface resistivity, quality factor, phase angle, dielectric conductivity, dielectric power loss and thermal withstand strength of the polyamide enamel¯lled with carbon nanotubes were analyzed and compared with the properties of the standard enamel. The experimental results show that carbon nanotubes mixed with polyamide enamel had better thermal properties when compared to that of standard enamel.

The increasing prevalence of antibiotics in the environment has promoted the development of antibiotic resistant microorganisms, and novel approaches are needed to effectively remove antibiotics from water and mitigate this worldwide problem. A reduced graphene oxide‐V2O5 (RGOV) nanocomposite was synthesized and used for photocatalytic degradation of the antibiotic oxytetracycline (OTC) in aqueous solution. The Sol–Gel method was employed for V2O5 synthesis from e‐waste‐based vanadium nitrate, and a one pot solvothermal method was used to synthesize RGOV. Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction spectroscopy (XRD), transmission electron microscopy (TEM) with energy dispersive analysis of X‐rays (EDAX) confirmed V‐O‐C bonds on the surface of the RGOV nanocomposites. A decrease in the band gap of V2O5 from 2.21 to 2.13 eV was supported by diffuse reflectance ultraviolet–visible spectrophotometry. OTC adsorption onto the nanocomposite increased with an increase in RGO concentration and saturated at 17% for RGOV with 30% graphene oxide. The composite degraded 90% of the OTC present in aqueous solution (50 mg/L). Platinum (1%) doping further increased OTC degradation by the nanocomposite to 98.7%. Optimum conditions for maximum OTC degradation are (1) an initial OTC concentration of 50 mg/L, (2) a RGOV nanocomposite dose of 0.5 g/L, and (3) a 40 min incubation time. Our results support the potential use of RGOV nanocomposite for OTC photodegradation. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13123, 2019

Partial discharges were in general a consequence of local electrical stress concentrations in the insulation or on the surface of the insulation. A wide group of discharge phenomena such as internal discharges occurring in voids or cavities within solid or liquid dielectrics, surface discharges appearing at the boundary of different insulation materials, corona discharges occurring in gaseous dielectrics in the presence of inhomogeneous fields and continuous impact of discharges in solid dielectrics forming discharge channels were included as partial discharges. It has been observed that the use of nano composites in the matrix of polymeric materials can greatly improve the thermal, mechanical and electrical properties of polymeric nano composites. A nano composite (TiO 2 +SiO 2 ) has been tested as nano filler. The micro particles of TiO 2 and SiO 2 are converted into nano particles with the help of ball mill. Scanning electron microscope (SEM) has been used to augment the particle size of nano composite. These nano composites were mixed with standard (Elmo Luft 1A-FD) enamel with help of ultrasonic vibrator. The partial discharge characteristics of enamel, micro composite (3:1, 1:3, 1:1 of SiO 2 and TiO 2 ) filled enamel and nano composite (3:1, 1:3, 1:1 of SiO 2 and TiO 2 ) filled enamel were detailed and analyzed. The partial discharge measurement was carried out in uniform field electrode configurations. The mixing of nano composites of SiO 2 and TiO 2 taken in the proportion of 1:3 with enamel has a significant improvement in the values of partial discharge inception and extinction voltage by 25% and 35% respectively when compared to the partial discharge inception and extinction voltage of the enamel. Similarly, the enamel filled with micro composites of SiO 2 and TiO 2 taken in the proportion of 1:3 has an increase of 19% and 35% in the values of partial discharge inception and extinction voltage respectively when compared to the partial discharge inception and extinction voltage of the enamel.

-Three phase induction motors consume 60% of industrial electricity. Just 1% increase in efficiency of all the motors in India will save 500 MW powers which needs the initial generation cost of 2000 crores. Actions were taken to use the enamel filled with SiO2 and TiO2 nanocomposite as the coating for the induction motor to improve its efficiency. The efficiency of the induction motor was increased by 5% by adding nanocomposites of SiO2 and TiO2 (1:3) to the enamel used as the coating for the windings of the three phase squirrel cage induction motor. Heat run test was performed on electrical machines to determine the total loss of energy dissipated as heat. The addition of nanocomposites to the enamel has increased the temperature withstanding capacity of the induction motor. The values of electromagnetic inference produced by normal induction motor and nano coated induction motor was also measured and analyzed. There was a reduction of 15 to 60% in the values of the electromagnetic interference produced by the normal induction motor when compared to that of nanocomposite filled enamel coated induction motor at various distances. This method can be used as one of the method to reduce the electromagnetic interference by the induction motors.

Abstract:It has been observed that the addition of nano fillers to the enamel can greatly improve the dielectric properties of the enamel. Carbon nanotubes have been tested as nano filler. Chemical vapour deposition method was used to synthesize carbon nanotubes. Scanning electron microscope has been used to augment the particle size of carbon nanotubes. These carbon nanotubes were mixed with standard (Elmo Luft 1A-FD) enamel with help of ultrasonic vibrator. The basic dielectric properties such as dielectric loss tangent (tan ), dielectric constant( ), quality factor, phase angle, dielectric conductivity and dielectric power loss of the enamel filled with carbon nanotubes were analyzed and compared with the properties of the standard enamel. These different dielectric properties were found with the help of the Dielectric Spectroscopy. Dielectric constant, dielectric losses, dielectric conductivity and heat generated under AC fields were analyzed for the frequency range of 50 Hz to 5 MHz. At 50 Hz, the enamel filled with 1 wt% of carbon nanotubes has lower dissipation factor and dielectric losses. At 5 MHz, the enamel filled with 3 wt% of carbon nanotubes has lower dissipation factor and dielectric losses.