Research Information System
V. International Ege Composite Materials Symposium 2021, Antalya, Turkey, 4 - 06 November 2021, pp.229
Plant-mediated synthesis of magnetic nanoparticles (MNPs) is more suitable for a broad spectrum of
applications including drug delivery, biosensing, food industry and wastewater cleaning, etc. Due to the
advantages, it provides especially in terms of environment and green chemistry, new application areas are
also emerging. The current study focuses mainly on the use of magnetic powder on magnetic particle
inspection (MPI). For this purpose, iron oxide (Fe3O4) MNPs were prepared via green tea extract (GTE).
MPI is one of the most preferred Non-destructive testing (NDT) techniques in industry for detecting the
presence of cracks at the surface or sub-surface of ferromagnetic materials. The synthesized nanoparticles
(Fe3O4-GTE MNPs) were characterized by Energy Dispersive Spectroscopy (EDS), X-ray Diffraction
Analysis (XRD) and Scanning Electron Microscopy (SEM). The magnetic properties of Fe3O4-GTE MNPs
were measured using Vibrating-Sample Magnetometer (VSM) in order to better understand the
magnetization. And, the quality control tests of the synthesized magnetic powder were tested on the
reference test bar and the welded steel. Firstly, GTE was analyzed by High Performance Liquid
Chromatography (HPLC). Catechin (C), epicatechin (EC), gallocatechin (GC), epigallocatechin (EGC),
epicatechin gallate (ECG), epigallocatechin gallate (EGCG) and gallocatechin gallate (GCG) are the major
catechins present in GTE which act as a reducing agent by oxidizing. According to the results of EDS
analysis, Fe, C and O elements are present in the sample. The atomic compositions for Fe, C and O were
8.89%, 39.39% and 51.73%, respectively. The size distribution of Fe3O4-GTE MNPs from SEM images
was found a range of 71-206 nm. VSM results show that the saturation magnetization (Ms) value has been
measured 10.39 emu/g. Fe3O4-GTE MNPs were applied to the cracks on the reference test bar and the
welded St37 steel material and the cracks are successfully detected by MPI which using Fe3O4-GTE MNPs
fluid. All experimental results are examined, that plant-mediated MNPs have great potential as a new
magnetic powder for MPI applications on industrial parts. In accordance with the experimental evidence
obtained, it is thought that it provides a different perspective on the detection of cracks of industrial parts.