Structural and dielectric properties of superparamagnetic iron oxide nanoparticles (SPIONs) stabilized by sugar solutions

Abstract

Superparamagnetic iron oxide nanoparticles (SPIONs) have been synthesized using co-precipitation method. Their microstructure and dielectric properties were studied. The sugar solutions like glucose, fructose and sucrose were used as stabilizers to control the size of the SPIONs. The crystal structure and grain size of the particles were determined by X-ray diffraction. The magnetic studies of the samples were carried out using the vibrating sample magnetometer and their surface morphology was studied by HRTEM, FE-SEM and zeta potential. The dielectric properties of glucose-SPIONs (GF), fructose-SPIONs (FF) and sucrose-SPIONs (SF) were investigated in the frequency range of 10 Hz to 5 MHz at selected temperatures. The FF showed a high dielectric constant of 62 at 1 MHz and the dielectric properties of SPIONs were found to have been significantly improved, especially in the low frequency regime according to the Maxwell-Wagner interfacial polarization. The AC conductivity measurements revealed that the electrical conduction depends on both frequency and temperature. Impedance analysis was carried out using Cole-Cole plot and the conduction mechanism of the studied compounds was explained. R and C values were further calculated using RC-circuit.

Optical and functional properties of hydrothermally synthesized tetragonal Ba0.4Cu0.6−xLaxTiO3 (x = 0.2–0.6) nanoparticles

“…It may be acquired as a result of the high interactions existed among the nanosized grains. This kind of behavior was noted in the earlier reports [28][29][30][31]. Furthermore, the average grain size (G) was evaluated with the help of linear intercept method (LIM) [32][33][34].…”

Magnetic and antimicrobial properties of cobalt‐zinc ferrite nanoparticles synthesized by citrate‐gel method

“…[44][45][46][47][48][49][50][51] Substitution of zinc ions in the composition (Co 0.6 Zn 0.4 Fe 2 O 4 ) with a moment of 0 μB migrates ions from tetrahedral site causes an increase of total magnetic movement. It is a known fact that the ZF performs a normal spinel structure in which the zinc cations occupy the A-site while the iron cations prefer to occupy the B-site.…”

“…In general, these magnetic parameters are mainly dependent on few factors viz., the preparation route, cation distribution, crystallite size, and sintering conditions. [44][45][46][47][48][49][50][51] Substitution of zinc ions in the composition (Co 0.6 Zn 0.4 Fe 2 O 4 ) with a moment of 0 μB migrates ions from tetrahedral site causes an increase of total magnetic movement. The difference is shown in the Figure 8.…”

“…The bulk ZnFe 2 O 4 revealed high M s value rather than its nanoform. 49 This may be acquired due to the presence of multi-domain structure of bulk ZnFe 2 O 4 system. The low M s , low size, and superparamagnetic nature are observed for only x = 0.4 & 1 compositions.…”

Synthesis of immobilized ZnO over polyurethane and photocatalytic activity evaluation for the degradation of azo dye under UV and solar light irardiation

“…This process resulted in complete mineralization of noxious pollutants into CO 2 and H 2 O at ambient conditions [22,26]. Various semiconductors along with other metal oxides have been evaluated as catalyst for AOP i.e., zinc oxide (ZnO), zinc sulfide (ZnS), iron(III) oxide (Fe 2 O 3 ), cobalt iron oxide, BiFeO based nanocomposites, scadmium sulfide (CdS) titanium and dioxide (TiO 2 ) [24][25][26][35][36][37][38][39][40][41][42]. Semiconductor nanoparticles are considered suitable for wastewater treatment due to their non-toxic behavior, chemically and biologically inert and inexpensive [43][44][45].…”