Structural and Electrical Properties of Ni‐Substituted Mg‐Mn Nanoferrite by Coprecipitation Route

Ni²⁺ ions doped on Mg_0.40Mn_0.60‐xNi_xFe₂O₄ compositions with 0.00 ≤ x ≤ 0.60 have been synthesized by coprecipitation method and taken for the present work to study the dielectric properties and impedance characterization using the XRD and electrical measurements. The X‐ray diffraction and FT‐IR revealed that the ferrite has single‐phase cubic spinel structure. The calculated particle size from XRD data verified using SEM as well as AFM. These photographs show that the ferrites have crystalline size in the range of 20–50 nm. It was observed that the particle size decreased and Ni concentration increased. The dielectric constant and dielectric loss decreased with increase in nonmagnetic Ni²⁺ ions. Electrical properties indicate that synthesized nanoferrite particles have high resistivity.     

Investigation on Thermal Studies of Nanofluids Related to Their Applications

This work concerns the thermal studies and applications of suspensions of nanoparticles in fluids, that is, nanofluids. They have been traditionally used for heat transfer applications due to their low thermal conductivity, taking into account the rising demands of modern technology. They show substantial augmentation of their thermal properties and their distinctive features offer more potential for many applications. Most of the publications on nanofluids are about understanding their behavior so that they can be utilized. The straight enhancement of nanofluids is paramount in many industrial applications, nuclear reactors, transportation, and electronics as well as in biomedicine and food. Our theoretical research focuses on presenting the wide range of applications that involve nanofluids, prominence on their improved properties that are controllable. It is the specific characteristics that these nanofluids possess that make them suitable for such applications. We are certain that this paper will be used by researchers in the nanofield.     

Experimental Investigations on Dielectric Fluids Behavior in High‐Power Transformers

The dielectric breakdown voltage of MgMnNi/transformer oil‐based nanofluids was systematically investigated under the influences of an electric field. The experimental behavior appears to come to a maximal end value of the breakdown voltage at around 72 kV. The prepared dielectric fluid has been investigated for use as high‐voltage insulation. The dielectric strengths of these nanofluids increase possibly due to enhanced electric field dissipation due to the presence of magnetite nanoparticles in fluids. The zeta potential value was found to be ?18.8 mV, which shows that the nanoparticles are highly stable even at a pH 10. The thermophysical properties were performed using KD2 Pro method, and for viscosity measurements, DV‐E viscometer was used.