TY - JOUR A1 - Hetti, M. A1 - Wei, Q. A1 - Casperson, Ralf A1 - Pohl, Rainer A1 - Bartusch, M. A1 - Neu, V. A1 - Pospiech, D. A1 - Voit, B. T1 - Magnetite core-shell nanoparticles in nondestructive flaw detection of polymeric materials N2 - Nondestructive flaw detection in polymeric materials is important but difficult to achieve. In this research, the application of magnetite nanoparticles (MNPs) in nondestructive flaw detection is studied and realized, to the best of our knowledge, for the first time. Superparamagnetic and highly magnetic (up to 63 emu/g) magnetite core-shell nanoparticles are prepared by grafting bromo-end group-functionalized poly(glycidyl methacrylate) (Br-PGMA) onto surface-modified Fe3O4 NPs. These Fe3O4-PGMA NPs are blended into bisphenol A diglycidylether (BADGE) based epoxy to form homogeneously distributed magnetic epoxy nanocomposites (MENCs) after curing. The core Fe3O4 of the Fe3O4-PGMA NPs endows the MENCs with magnetic property, which is crucial for nondestructive flaw detection of the materials, while the shell PGMA promotes colloidal stability and prevents NP aggregation during curing. The eddy current testing (ET) technique is firstly applied to detect flaws in the MENCs. Through the brightness contrast of the ET image, surficial and sub-surficial flaws in MENCs can be detected, even for MENCs with low content of Fe3O4-PGMA NPs (1 wt %). The incorporation of Fe3O4-PGMA NPs can be easily extended to other polymer and polymer-based composite systems and opens a new and very promising pathway toward MNP-based nondestructive flaw detection in polymeric materials. KW - Magnetite nanoparticles KW - Poly(glycidyl methacrylate) KW - Atom transfer radical polymerization KW - Magnetic nanocomposites KW - Nondestructive flaw detection PY - 2016 U6 - https://doi.org/10.1021/acsami.6b09934 SN - 1944-8244 SN - 1944-8252 VL - 8 IS - 41 SP - 28208 EP - 28215 PB - American Chemical Society CY - Washington, DC AN - OPUS4-38300 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -