Heat dissipation in Sm3+ and Zn2+ co-substituted magnetite (Zn0.1SmxFe2.9-xO4) nanoparticles coated with citric acid and pluronic F127 for hyperthermia application

Abstract

In this work, Sm3+ and Zn2+ co-substituted magnetite Zn0.1SmxFe2.9-xO4 (x = 0.0, 0.01, 0.02, 0.03, 0.04 and 0.05) nanoparticles, have been prepared via co-precipitation method and were electrostatically and sterically stabilized by citric acid and pluronic F127 coatings. The coated nanoparticles were well dispersed in an aqueous solution (pH 5.5). Magnetic and structural properties of the nanoparticles and their ferrofluids were studied by different methods. XRD studies illustrated that all as-prepared nanoparticles have a single phase spinel structure, with lattice constants affected by samarium cations substitution. The temperature dependence of the magnetization showed that Curie temperatures of the uncoated samples monotonically increased from 430 to 480 °C as Sm3+ content increased, due to increase in A-B super-exchange interactions. Room temperature magnetic measurements exhibited a decrease in saturation magnetization of the uncoated samples from 98.8 to 71.9 emu/g as the Sm3+ content increased, which is attributed to substitution of Sm3+ (1.5 µB) ions for Fe3+ (5 µB) ones in B sublattices. FTIR spectra confirmed that Sm3+ substituted Zn0.1SmxFe2.9-xO4 nanoparticles were coated with both citric acid and pluronic F127 properly. The mean particle size of the coated nanoparticles was 40 nm. Calorimetric measurements showed that the maximum SLP and ILP values obtained for Sm3+ substituted nanoparticles were 259 W/g and 3.49 nHm2/kg (1.08 mg/ml, measured at f = 290 kHz and H = 16kA/m), respectively, that are related to the sample with x = 0.01. Magnetic measurements revealed coercivity, which indicated that hysteresis loss may represent a substantial portion in heat generation. Our results show that these ferrofluids are potential candidates for magnetic hyperthermia applications.

Study of biopolymer encapsulated Eu doped Fe3O4 nanoparticles for magnetic hyperthermia application

“…2 , portray a pure crystalline phase, which exhibits distinct diffraction peaks ascertained as (220), (311), (400), (511), and (440). Herein, the observed peaks in the X-ray diffraction pattern can be attributed to the cubic spinel structure of Fe 3 O 4 , which aligns with the data documented in the ICDD PDF card number 01–075-0033 with space group Fd m 19 . Furthermore, due to the non-crystalline structure of dextran and chitosan, the final product matrix (DEuFO/CEuFO) indicates no alteration of the crystal structure 20 .…”

“…Furthermore, based on the existing literature, the widely adopted approach to control aggregation is the effective conjugation of biomolecules such as peptides, oligonucleotides, antibodies, and natural polymers 1 , 7 – 11 . According to previous studies, chitosan and dextran have emerged as highly promising candidates for encapsulating engineered RE-doped FO MNPs due to their non-antigenic, biocompatible, bio-functional, and biodegradable nature 10 – 19 . In this work, a novel experimental approach is presented to accurately understand the role of dipolar interactions and heating efficiency, with the specific goal of distinguishing energy contributions towards MFH applications.…”

Role of site selective substitution, magnetic parameter tuning, and self heating in magnetic hyperthermia application: Eu-doped magnetite nanoparticles

“…1 . The observed XRD peak positions fit satisfactorily with the magnetite phase 18 and also display the high crystallinity of these NPs. Furthermore, the reflections from the atomic planes (220), (311), (400), (422), (440), and (511) are identified and confirmed from the single-phase cubic spinel structure with space group Fd 3̄ m .…”

Influence of Controlled Dipolar Interaction for Polymer-Coated Gd-Doped Magnetite Nanoparticles toward Magnetic Hyperthermia Application

“…The powder XRD scans of designed dextran- and chitosan-coated Gd-doped Fe 3 O 4 MNPS are portrayed in Figure a. The experimental XRD peak positions fit competently with the magnetite phase and show the high crystallinity of these MNPs. Hereafter, the reflections from the atomic planes (220), (311), (400), (422), (440), and (511) correspond to the single-phase face-centered cubic spinel structure with the space group Fd 3̅ m .…”