Preparation and Characterization of Fe3O4 Magnetic Nanofluid in Vegetable Oil

Abstract

This paper reports the synthesis of Fe3O4 nanoparticles with a hydrophobic surface functionalized with oleic acid through a simple and efficient route in air atmosphere and by co-precipitation. The hydrophobic surfactant agent was added in the magnetic crystal growth stage. Magnetic nanofluid was obtained by ultrasonic dispersion of magnetic nanoparticles in a carrier liquid � vegetable oil. The sample as powder has been characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, Transmission Electron Microscopy (TEM), and Vibrating Sample Magnetometry (VSM) at room temperature. The magnetic nanofluid in vegetal oil was investigated by determining the stability of the nanoparticles in the vegetable oil through UV-Vis spectrometry method, the magnetic properties through Vibrating Sample Magnetometry (VSM) method at room temperature, and thermal conductivity as function of magnetic nanoparticles volume concentration and of temperature.

Synthesis and Characterization of Hydrophilic gama-Fe2O3 Nanoparticles for Biomedical Applications

“…With increasing of heat treatment temperature, the saturation magnetization value increases from 51.59 emu/g for sample S1 treated at 270°C/1h to 55.56 emu/g for sample S1 treated at 280°C/4h. However, the saturation magnetization values are lower than those of the bulk γ-Fe 2 O 3 (76 emu/g) [24,25] due to the presence of the nonmagnetic (PVP) coating and the small size effect of the γ-Fe 2 O 3 particles.…”

Synthesis and Characterization of Water Dispersible Iron Oxide (�a-Fe2O3) Nanoparticles for Biomedical Applications

“…In the spectrum in Figure 2 (b) two peaks are observed at 1636 cm -1 and 1391 cm -1 assigned to the vibrations of asymmetric and symmetric stretching of carboxyl anion from the structure of L-lysine. The splitting between the asymmetric and symmetric stretching of carboxyl group is higher than 200 cm -1 indicating a unidentate coordination between the carboxyl group and the hydroxyl group on the nanoparticles surface [8]. The peak at 2925 cm -1 is given by asymmetrical stretching vibration of the C-H bond and peak at 3442 cm -1 is assigned to the stretching vibration of N-H bond from the amino acid structure.…”

“…For this reason, in the last period different methods and processes for the preparation of iron oxide nanoparticles have been intensively studied and improved. Many chemical synthesis methods are reported till present for iron oxide nanoparticles preparation: co-precipitation [5][6][7][8][9][10], thermal decomposition [11,12], hydrothermal method [13], the solvothermal method [14], the sonochemical method [15,16], the electrochemical method [17], the microemulsion method [18], and others [19][20][21][22]. In order to obtain a magnetically sensitive biocompatible material it is necessary to stabilize the iron oxide nanoparticles either by modifying the surfaces or by incorporating them in biocompatible matrices.…”

Carotenoids, Flavonoids, Total Phenolic Compounds Content and Antioxidant Activity of Indigenous Pyracantha coccinea M. Roem. Fruits

“…While flavonoid content in Pyracantha was less studied, some data are available from related genera, like Cotoneaster sp. The literature mention that Cotoneaster horizontalis would contain 6800 mg/kg [17], while Cotoneaster multiflorus fruit contain up to 53700 mg/kg DW flavonoids (amount highly dependent on solvents used) [18][19][20][21][22].…”