Fabrication of Mn0.25Fe2.75 O4/Ag/OA/DMSO Ferrofluids with Sunflower Oil Dispersion as Antibacterial Agent Nur Elma Ayu Wahyuni, Ahmad Taufiq, Arif Hidayat, Nandang Mufti, ST. Ulfawanti Intan Subadra
Department of Physics, Faculty of Mathematics and Natural Sciences, State University of Malang, Jl. Semarang 5, Malang, 65145, Indonesia
Abstract
This research has succeeded in developing Mn0.25Fe2.75O4/Ag/OA/DMSO ferrofluid based on natural sand and sunflower seed oil as antibacterial agents. The ferrofluid filler, Mn0.25Fe2.75O4/Ag, was prepared by co-precipitation and reduction methods, and characterized by XRD and SEM to determine the crystal structure, morphology, and particle size. Furthermore, the functional groups of ferrofluid Mn0.25Fe2.75O4/Ag/OA/DMSO are known from the FTIR test results. The antibacterial activity of ferrofluid has also been characterized using a good method to determine the diameter of the zone of inhibition of bacterial growth. XRD diffraction pattern shows that the highest peak of Mn0.25Fe2.75O4/Ag /Ag is located at 35.4o for Mn0.25Fe2.75O4/Ag which is spinel inverse cubic and 38.1o for face-centred cubic Ag. Based on the analysis, the crystal size of Mn0.25Fe2.75O4/Ag was 9.52 nm for Mn0.25Fe2.75O4/Ag and 12.5 nm for Ag. Ferrofluid fillers are composed of spherical particles and tend to agglomerate. The main functional groups of ferrofluid Mn0.25Fe2.75O4/Ag /Ag/OA/DMSO detected were C-O, S-O, Fe-O and Mn-O at wavenumbers 1170, 950, 707, 410 cm-1. The C-O and S-O functional groups are characteristic of OA, DMSO, and sunflower seed oil. The result is if the ferrofluid Mn0.25Fe2.75O4/Ag/OA/DMSO was successfully synthesized. The results of testing the antibacterial activity of ferrofluid using Escherichia coli bacteria and Staphylococcus aureus bacteria showed zone values of 5.72 mm and 6.60 mm.
