Evaluating physical changes of iron oxide nanoparticles due to surface modification with oleic acid
S Rosales1, N Casillas1, A Topete3, O Cervantes1, G Gonz\'alez1, J A Paz2, and M E Cano2,†
1Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Marcelino García Barragán 1421, C. P. 44430, Guadalajara, Jalisco, México 2Centro Universitario de la Ciénega, Universidad de Guadalajara, Av. Universidad 1115, C. P. 47820, Ocotlán, Jalisco, México 3Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Sierra Mojada 950, C. P. 44340, Guadalajara, Jalisco, México
The physical characterization of a colloidal system of superficially modified magnetic nanoparticles (MNPs) is presented. The system consists of oleic acid-coated iron oxide nanoparticles (OAMNP) suspended in water. A structural analysis is carried out by using standard physical techniques to determine the diameter and shape of the MNPs and also the width of the coating shell. The colloidal stability and the polydispersity index of this ferrofluid are determined by using Zeta potential measurements. Additionally, the magnetic characterization is conducted by obtaining the DC magnetization loops, and the blocking temperatures are determined according to the ZFC–FC protocol. Finally, the values of power absorption density P of the ferrofluid are estimated by using a magneto-calorimetric procedure in a wide range of magnetic field amplitude H and frequency f. The experimental results exhibit spherical-like shape of OAMNP with (20 ± 4) nm in diameter. Due to the use of coating process, the parameters of the magnetization loops and the blocking temperatures are significantly modified. Hence, while the uncoated MNPs show a blocking state of the magnetization, the OAMNP are superparamagnetic above room temperature (300 K). Furthermore, the reached dependence P versus f and P versus H of the ferrofluid with coated MNPs are clearly fitted to linear and quadratic correlations, respectively, showing their accordance with the linear response theory.
S Rosales, N Casillas, A Topete, O Cervantes, G Gonz\'alez, J A Paz, and M E Cano† Evaluating physical changes of iron oxide nanoparticles due to surface modification with oleic acid 2020 Chin. Phys. B 29 100502
Fig. 1.
(a) Typical XRD spectra of uncoated (dark lines) and OAMNP (gray lines) samples, (b) close-up of the main peaks, (c) SEM micrograph of the OAMNP, (d) size distribution plot fitted to a normal data regression, (e) SEM of uncoated MNPs, and (f) corresponding plot including the data regression.
Fig. 2.
FTIR spectra of uncoated Fe3O4 nanoparticles (dark), pure oleic acid (blue), and OAMNP (gray).
Fig. 3.
(a) Relative mass Mversus temperature of OAMNP over the interval 30 °C < T < 850 °C and (b) corresponding derivative in the same temperature interval.
Fig. 4.
The pH-dependent (a) Zeta potential, (b) their corresponding hydrodynamic diameters, and (c) polydispersity index of water-suspended coated (open circles) and uncoated (black circles) MNPs.
Fig. 5.
(a) Magnetization loops at room temperature of uncoated and coated MNPs, and (b) their corresponding ZFC–FC graphs using H = 100 Oe.
Fig. 6.
Time dependent (a) temperature increment during 2 min applying H = 25 mT with five values of f, and (b) power density.
Fig. 7.
(a) Temperature increment during 2 min applying f = 330 kHz with five steps of H, and (b) the dependence PversusH with the corresponding quadratic data regression.
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