Browsing by Author "Kushal Mehrotra"

Now showing 1 - 4 of 4

Humidity Effect on Ionic Conductivity of Composite Polymer Electrolytes
(John Wiley and Sons Inc, 2023) Ashish Raj; Kushal Mehrotra; S.P. Pandey; S. Venkatesan Jayakumar; Amit Saxena; Bhaskar Bhattacahrya
The solid polymer electrolytes (SPE) based electrochemical devices are an area of attention for more than two decades. The ability of thin-film preparation and leakage proof over the liquid counterpart are the key factors of SPE. In the present work, two different compositions, 80–20 and 85–15, of PVA:KI has been used as a host polymer complex. Where further 10 wt% of p-Si dispersed with PVA:KI complexes. Polymer films have been prepared with standard solution cast techniques, which are further characterized for their electrical conductivity by Electrical Impedance Spectroscopy (EIS). Also, the humidity effect on the ionic conductivity of these thin films is calculated. It is observed that the ionic conductivity of these polymer electrolytes films increases with 58%, 74%, and 89% humidity. To understand the change in this ionic conductivity, the concentration and mobility of ions are also calculated, and it is found that the change in conductivity are predominately influenced due to the mobility of charge carriers. © 2023 Wiley-VCH GmbH.
Humidity-Dependent Ion Conduction Mechanism of PVA-Based Polymer Electrolyte Films
(John Wiley and Sons Inc, 2023) Kailash Kumar; Kushal Mehrotra; Ashish Raj; Shri Prakash Pandey; Bhaskar Bhattacharya
Polymer electrolytes are studied worldwide for their possible applications in various electrochemical devices. In the last few decades, a large number of polymer electrolytes have been developed and characterized. However, in most cases, the effect of humidity has been ignored. In this paper, we report a systematic study on a polymer electrolyte's electrical and dielectric properties at different humidity. The chosen system is a Polyvinyl Alcohol (PVA) based polymer electrolyte in which potassium iodide (KI) with differing weight percentage is selected as the dopant salt for the synthesis of PVA-KI films. Four different compositions of PVA-KI films are synthesized using the solution cast technique. Electrical impedance spectroscopy (EIS) technique is used to determine its conductivity at three different humidity levels: 55%, 75%, and 85%. Analysis of dielectric permittivity and electrical modulus of the films is also done at these humidity levels. The highest conductivity for all the four different compositions of films is found to be at 85% humidity level, of which the optimum ionic conductivity is seen in the 75:25 composition of PVA:KI with a value of 1.25×10−4 S cm−1.The number of charge carriers and their mobility are calculated for all samples at different humidity levels. A correlation has been established between the conductivity of the films and the mobility of charge carriers. © 2023 Wiley-VCH GmbH.
Ion conducting studies in PEO: NaI and its composite: Carrier density approach
(Bentham Science Publishers, 2021) Kushal Mehrotra; Divya Singh; Bhaskar Bhattacharya
Background: The modulation in electrical conductivity of polymer electrolyte, viz., polyethylene oxide (PEO) complexed with different concentrations of sodium iodide is studied. The role of mobility and charge concentration in the electrical conductivity of polymer electrolytes is established. Methods: The complex impedance spectroscopy (CIS) method is used to measure the electrical conductivity of film. Results: The effect on charge concentration, mobility and conductivity of PEO+NaI film by adding three different concentration of silicon is reported. Conclusion: The polarized optical microscopy (POM) is used to study the morphology of the surface of PEO, PEO+NaI films dispersed with Si. © 2021 Bentham Science Publishers.
Synthesis and Characterization of Novel Diclofenac (DCF) Derivatives
(John Wiley and Sons Inc, 2023) Divya Rana Tomar; Kushal Mehrotra; Bhaskar Bhattacharya; Amit Saxena; Venkatesan Jayakumar
Over the years, scientific community has shown immense interest in the synthesis of novel, bioactive molecules with few adverse effects. Instead of painstaking multistep synthesis with hazardous synthetic reagents, also for clinical studies, it is better to enhance the activity and tuning by structural modification of the commercial drugs based on their structural and biological properties. It is demonstrated that diclofenac (DCF) be an effective analgesic and anti-pyretic in the treatment of cancer-related pain, but it has limitations and adverse effects as gastrointestinal irritation, small intestine damage, nausea, platelet dysfunction, and vertigo. Wherefore the main objective of the current research is to investigate new, novel, green methods of preparation of DCF derivatives, and structural characterization with the help of FT-IR, UV-Visible spectroscopy, MS spectrometry techniques. © 2023 Wiley-VCH GmbH.