Synthesis and characterization of a magnetic bio-nanocomposite based on magnetic nanoparticles modified by acrylated fatty acids derived from castor oil

摘要

The present work addresses the synthesis and characterization of a new bio-nanocomposite based on acrylated fatty acids (AFA) derived from castor oil, ethyl acrylate and AFA surface modified gamma-Fe2O3 (gamma-Fe2O3@AFA) magnetic nanoparticles (MNPs). It was shown that the in situ formed bioqianocomposite containing around 2.0 wt.% of gamma-Fe2O3 MNPs with average particle size of ca. 9.0 nm, as determined by XRD and TEM measurements, displayed good magnetic response and superparamagnetic behavior. The magnetization measurements indicated that the incorporation of gamma-Fe2O3@AFA MNPs into the poly(ethyl acrylate-co-AFA) matrix did not affect the magnetization saturation, remanence and coercivity of the MNPs, preserving the magnetic properties of the gamma-Fe2O3 precursor. Additionally, the use of AFA to chemically modify the surface of MNPs opens a new scenario on the chemical modification of MNPs with agents that undergo free-radical reactions, allowing for the proper dispersion of MNPs into the thermoplastic polymer matrices and minimizes the undesired leaching of the MNPs. (C) 2015 Elsevier Ltd. All rights reserved.