Dataset Information

Flux Growth and Magnetic Properties of Helimagnetic Hexagonal Ferrite Ba(Fe_1-x Sc _x )₁₂O₁₉ Single Crystals.

ABSTRACT: Fabricating large, high-crystalline-quality single-crystal samples of hexagonal ferrite Ba(Fe_1-x Sc _x )₁₂O₁₉ is the first important step to elucidating its helimagnetic structure and developing it for further applications. In this study, single crystals of Ba(Fe_1-x Sc _x )₁₂O₁₉ of various Sc concentrations x were successfully grown by the spontaneous crystallization method using Na₂O-Fe₂O₃ flux. We determined the optimal starting composition of reagents for Ba(Fe_1-x Sc _x )₁₂O₁₉ growth as a function of x. In situ monitoring of the crystal nucleus generation accelerated the success of crystal growth. The obtained crystals comprised black and lamellate structures with a size of 13 mm × 8 mm × 2 mm and a surface of {001} orientation. X-ray diffraction and elemental analysis revealed that the obtained crystals were composed of single-phase Ba(Fe_1-x Sc _x )₁₂O₁₉ of high crystalline quality. The lattice constants a and c increased linearly with increasing x, thereby following Vegard's law. The temperature dependence of magnetization and the magnetization curves at 77 K of the x = 0.128 crystal exhibited behavior characteristics of helimagnetism. Neutron diffraction measurements of the x = 0.128 crystal exhibited magnetic satellite reflection peaks below 211 K, providing evidence that Ba(Fe_1-x Sc _x )₁₂O₁₉ behaves as a helimagnetic material.

SUBMITTER: Utsumi S

PROVIDER: S-EPMC7528311 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Flux Growth and Magnetic Properties of Helimagnetic Hexagonal Ferrite Ba(Fe1-x Sc x )12O19 Single Crystals.

Utsumi Shigenori S Tanaka Seiya S Maruyama Kenichi K Hatakeyama Nao N Itoh Kenichi K Koike Jun J Horikawa Akihiro A Iriyama Hiroki H Kanamaru Hajime H Amako Yasushi Y Iiyama Taku T Futamura Ryusuke R Kiyanagi Ryoji R Nakao Akiko A Moriyama Kentaro K Ishikawa Yoshihisa Y Momozawa Nobuyuki N

ACS omega 20200917 38

Fabricating large, high-crystalline-quality single-crystal samples of hexagonal ferrite Ba(Fe1-x Sc x )12O19 is the first important step to elucidating its helimagnetic structure and developing it for further applications. In this study, single crystals of Ba(Fe1-x Sc x )12O19 of various Sc concentrations x were successfully grown by the spontaneous crystallization method us ...[more]

PMID: 33015508

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Project description:The PEG-coated ferrite nanoparticles Co0.2Mn0.6Zn0.2Fe2O4 (X1), Co0.4Mn0.4Zn0.2Fe2O4 (X2), and Co0.6Mn0.2Zn0.2Fe2O4 (X3) were synthesized by the coprecipitation method. The nanoparticles were characterized by XRD, Raman, VSM, XPS, and TEM. The magnetic hyperthermia efficiency (MH) was determined for PEG-coated nanoparticles using an alternating magnetic field (AMF). X2 nanoparticles displayed the highest saturation magnetization and specific absorption rate (SAR) value of 245.2 W/g for 2 mg/mL in a water medium. Based on these properties, X2 nanoparticles were further evaluated for antiproliferative activity against HCT116 cells at an AMF of 495.25 kHz frequency and 350 G strength, using MTT, colony formation, wound healing assays, and flow cytometry analysis for determining the cell viability, clonogenic property, cell migration ability, and cell death of HCT116 cells upon AMF treatment in HCT116 cells, respectively. We observed a significant inhibition of cell viability (2% for untreated control vs. 50% for AMF), colony-forming ability (530 cells/colony for untreated control vs. 220 cells/colony for AMF), abrogation of cell migration (100% wound closure for untreated control vs. 5% wound closure for AMF), and induction of apoptosis-mediated cell death (7.5% for untreated control vs. 24.7% for AMF) of HCT116 cells with respect to untreated control cells after AMF treatment. Collectively, these results demonstrated that the PEG-coated (CoMnZn-Fe2O4) mixed ferrite nanoparticles upon treatment with AMF induced a significant antiproliferative effect on HCT116 cells compared with the untreated cells, indicating the promising antiproliferative potential of the Co0.4Mn0.4Zn0.2Fe2O4 nanoparticles for targeting colorectal cancer cells. Additionally, these results provide appealing evidence that ferrite-based nanoparticles using MH could act as potential anticancer agents and need further evaluation in preclinical models in future studies against colorectal and other cancers.

Dataset Information

Flux Growth and Magnetic Properties of Helimagnetic Hexagonal Ferrite Ba(Fe_1-x Sc _x )₁₂O₁₉ Single Crystals.

Publications

Flux Growth and Magnetic Properties of Helimagnetic Hexagonal Ferrite Ba(Fe<sub>1-<i>x</i></sub> Sc <sub><i>x</i></sub> )<sub>12</sub>O<sub>19</sub> Single Crystals.

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