Influence of different synthesis conditions on properties of oleic acid-coated-Fe₃O₄ nanoparticles

Abstract

In the present paper, iron oxide nanoparticles coated by oleic acid have been synthesized in different conditions by coprecipitation method. For investigating the effect of time spent on adding the oleic acid to the precursor solution, two different processes have been considered. The as synthesized samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). Magnetic measurement was carried out at room temperature using a vibrating sample magnetometer (VSM). The results show that the magnetic nanoparticles decorated with oleic acid decreased the saturation of magnetization. From the data, it can also be concluded that the magnetization of Fe 3 O 4 /oleic acid nanoparticles depends on synthesis conditions.

Monodisperse magnetic lecithin-PFP submicron bubbles as dual imaging contrast agents for ultrasound (US) and MRI

“…The saturation magnetization ( M s ) values for oleic acid modified iron oxide nanoparticles is 8.28 emu g −1 which is smaller than those reported in the literature 23 which can be attributed to presence of non-magnetic layer of oleic acid surrounding magnetic core. Earlier literature shows small size can cause larger spin disordering and canting effects which lead to a reduction in magnetization 24 which is consistent with our results. The magnetic properties shown by VSM, and MFM showed the potential of designed construct to be used as T2 contrast agent in MR imaging.…”

Application of Hyperthermia for Cancer Treatment: Synthesis and Characterization of Magnetic Nanoparticles and their internalization on Tumor Cell Lines

“…Although oleic acid is only soluble in non-polar solvents, bilayer oleic acid-coated magnetite nanoparticles can be dispersed in polar liquids with the proper adjustment of pH. Though several works have been reported with oleic acid as a surfactant for magnetite nanoparticles (Kbari et al 2015;Talelli et al 2009;Wormuth 2001;Portet et al 2001), only few authors have reported the presence of an oleic acid bilayer that turns the iron oxide NPs soluble in aqueous solvents (Yang et al 2010;Liu et al 2006;Mahdavi et al 2013). Maity and Agrawal have prepared iron oxide NPs coated with either a mono-layer or a bilayer of oleic acid and found that they are either stable in kerosene and dodecane or water, respectively (Maity and Agrawal 2007).…”

“…bands at 2915 and 2850 cm -1 are attributed to the symmetric and asymmetric -CH2 stretch in the oleic acid molecule, respectively. The band at 1411 cm -1 corresponding to the CH3 umbrella mode of oleic acid and the bands at 1532 and 1430 cm -1 are respectively due to the symmetric and asymmetric -COOstretching vibration modes which indicates that the oleic acid is bound to the surface of Fe3O4 nanoparticles through covalent bond between -COOgroups and Fe atom (Zhang et al 2006;Aliakbari et al 2015). It is worth to note that the band at 1708 cm -1 corresponding to the stretching vibration of C=O in oleic acid only appears when Fe3O4 NPs are synthesized by excess oleic acid (Yang et al 2010;Soares et al 2014).…”

Nanopartículas de magnetita dopadas com zinco para fins teranósticos: magnetoacustografia e hipertermia magnética

“…In addition to being a biocompatible material, the magnetic properties of magnetite can be tuned for wide range of applications [104]. This magnetic tuning can be achieved either by changing the preparation method and conditions [105,106] or by substituting different cations in magnetite structure. Saturation magnetization, Curie temperature and coercivity are examples of tunable magnetic properties that have been explored by many researches [37,102,107,108].…”