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Abstract: A novel series of heterobimetallic complexes of copper has been synthesized possessing 2,6-diaminopyridine moiety. All the synthesized complexes have been characterized in the light of various physicochemical techniques like elemental analyses, conductance measurements, molecular weight determination, electronic, infrared and electronic spin resonance X-ray, mass spectral studies and DFT analysis. The observed low conductance values of the synthesized heterobimetallic complexes suggest their non-ionic character. The studies presented in the series unveils the propensity of Cu(II) complexes with general formula [Cu(C₅H₅N₃)₂M'₂(R)₄Cl₂] where M'=Sn, Si, Ti or Zr and R= CH₃,C₆H₅ or C₅H₅ against microbial pathogens Fusarium oxysporum, Rhizopus nigricans, Escherichia coli and Bacillus subtilis. Amid all the heterobimetallic complexes, the one presenting most promising antimicrobial activity was assessed on male albino rats for its toxicological effect by comparing the results with the standard fungicide Bavistin.

Keywords: Bimetallic complexes, Heterobimetallic complexes, DFT investigation, Antibacterial activity, Antifungal activity, Toxicological.

Title: Synthesis, Spectroscopic Elucidation, Density Functional Theory (DFT) Calculations, Toxicological Effects and Biological aspects of Novel Heterobimetallic Cu(II) complexes containing 2,6-diaminopyridine Moiety

Author: Madhu, P. Sharma, A. Singh, Ashu Chaudhary

International Journal of Recent Research in Physics and Chemical Sciences (IJRRPCS)

ISSN 2350-1030

Vol. 12, Issue 1, April 2025 - September 2025

Page No: 17-28

Paper Publications

Website: www.paperpublications.org

Published Date: 07-June-2025

Abstract: This is a research work on the inhibition of mild steel corrosion in acidic medium, using Nypa palm fruit extract. The corrosion of metals is a serious problem in many industries, installations and civil services such as water and sewage supplies. One of the most useful and practical methods that is used to control and protect metals against corrosion is the use of inhibitors, especially in acidic media. This study investigated the effective use of Nypa palm fruit extract in epoxy matrix as a bio-based corrosion inhibitor in epoxy coatings for mild steel exposed to acidic solutions. This research was assessed by fourier transform infrared spectroscopy, FTIR and polarization, PDP technique. The fourier transform infrared spectroscopy revealed peaks that corresponds to functional groups, while polarization curves revealed that the extract in epoxy matrix a barrier-layer inhibitor. Inhibition efficiency increased with extract concentration increased up to 1.5g. The results revealed that the extract of the nypa palm fruit in epoxy matrix could serve as an effective inhibitor for the corrosion of mild steel in acidic medium.

Keywords: Nypa palm, Epoxy matrix, Mild steel, Corrosion, Acidic media.

Title: INHIBITION OF MILD STEEL CORROSION IN ACIDIC MEDIUM USING NYPA PALM FRUIT ACETONE EXTRACT

Author: Odike, O. C., Sofolabo, A. O., Amakoromo, T. E.

International Journal of Recent Research in Physics and Chemical Sciences (IJRRPCS)

ISSN 2350-1030

Vol. 12, Issue 1, April 2025 - September 2025

Page No: 11-16

Paper Publications

Website: www.paperpublications.org

Published Date: 24-April-2025

Abstract: This study investigates the enhancement of thermal energy storage performance in phase change materials (PCMs) through the integration of nanoparticles, focusing on nano-enhanced PCMs (NEPCMs). A finite volume numerical model is developed to simulate heat transfer and fluid dynamics during the melting process within a cylindrical enclosure. The governing equations of mass, momentum, and energy are discretized and non-dimensionalized to evaluate the effects of nanoparticle concentration, size, and distribution on heat transfer efficiency and thermodynamic stability. Aluminum oxide (Al 2 O 3 ) is used as the nanoparticle additive, with simulation results highlighting the relationship between enthalpy, energy, and velocity. The results demonstrate that nanoparticle incorporation significantly improves thermal conductivity, stabilizes flow during phase transition, and enhances overall system performance. These findings offer crucial insights into the design and optimization of solar thermal energy storage systems using NEPCMs for sustainable energy applications.

Keywords: Heat transfer; Nanoparticle; Phase change materials; Solar thermal energy storage; Thermal energy storage.

Title: Heat Transfer-Based on Nano-particles for Thermal Energy Storage in Phase Change Material

Author: Florence Awuor Misawo, Thomas T. O. Onyango, Fredrick O. Nyamwala

International Journal of Recent Research in Physics and Chemical Sciences (IJRRPCS)

ISSN 2350-1030

Vol. 12, Issue 1, April 2025 - September 2025

Page No: 1-10

Paper Publications

Website: www.paperpublications.org

Published Date: 15-April-2025