Evolution of structural and magnetic properties in iron oxide nanoparticles synthesized using Azadirachta indica leaf extract. (29th July 2020)

• Record Type: Journal Article
• Authors: Kanase, R S; Karade, V C; Kollu, P; Sahoo, Subasa C; Patil, P S; Kang, S H; Kim, J H; Nimbalkar, M S; Patil, P B
• Is Part Of: Nano express. Volume 1:Number 2(2020)
• Publication Date: 2020-07-29
• Subjects: green synthesis -- iron oxide -- magnetic nanoparticles -- antibacterial activity -- Azadirachta indica (Neem); Nanotechnology -- Periodicals; Nanoscience -- Periodicals; 620.5
• DOI: 10.1088/2632-959X/aba682
• Languages: English
• ISSNs: 2632-959X

Abstract

Abstract: The novel superparamagnetic nature of magnetic nanoparticles (MNPs) has received significant attention in the wide variety of fields. However, the prerequisites to use these MNPs, particularly in biomedical applications are biocompatibility and high saturation magnetization (Ms ). Thus, the development of a sustainable approach for the synthesis of biocompatible MNPs, which utilizes the redox properties of natural compounds from plant extracts, is highly desired. Herein, we have examined the growth of phase selective MNPs synthesized using Azadirachta indica (Neem) extract as a reducing and capping agent. The physical and biological properties of MNPs synthesized with the modified green hydrothermal method at different reaction times and temperatures were investigated. It was observed that the reaction time and temperature strongly modulated the magnetic and structural characteristics of MNPs. At lower reaction time and temperature of 200 °C for 2 h, primarily iron oxalate hydrate (Fe(C2 O4 ).2(H2 O)) was formed. Further, with increasing reaction temperature, the phase transformation from iron oxalate hydrate to pure magnetite (Fe3 O4 ) phase was observed. The MNPs prepared with optimum conditions of 220 °C for 4 h show superparamagnetic nature with improved Ms value of 58 emu g −1 . The antibacterial study of MNPs against gram-positive bacteria Staphylococcus aureus showed that the MNPs inhibits the growth of bacteria with the least inhibitory MNPs concentration of 6 μ l. Thus, the MNPs obtained by this modified biogenic approach will widen the scope and their applicability in future biomedical applications.