Open AccessEvolution of structural and magnetic properties in iron oxide nanoparticles synthesized using Azadirachta indica leaf extract
Author(s) -
Rohini Subhash Kanase,
Vijay Karade,
Pratap Kollu,
Subasa C. Sahoo,
Pramod Patil,
Soon–Hyung Kang,
Jihun Kim,
Mansingraj S. Nimbalkar
Publication year - 2020
Publication title -
nano express
Language(s) - English
Resource type - Journals
ISSN - 2632-959X
DOI - 10.1088/2632-959x/aba682
Subject(s) - superparamagnetism , azadirachta , magnetite , nanoparticle , biocompatibility , magnetic nanoparticles , iron oxide , chemistry , iron oxide nanoparticles , chemical engineering , ferrofluid , nuclear chemistry , hydrate , nanotechnology , materials science , magnetization , organic chemistry , metallurgy , engineering , biology , physics , quantum mechanics , magnetic field , horticulture
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 (M s ). 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(C 2 O 4 ).2(H 2 O)) was formed. Further, with increasing reaction temperature, the phase transformation from iron oxalate hydrate to pure magnetite (Fe 3 O 4 ) phase was observed. The MNPs prepared with optimum conditions of 220 °C for 4 h show superparamagnetic nature with improved M s 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.