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Albadi Y, Ivanova MS, Grunin LY, Makarin RA, Komlev AS, Chebanenko MI, Nevedomskyi VN, Popkov VI. Ultrasound-assisted co-precipitation synthesis of GdFeO 3 nanoparticles: structure, magnetic and MRI contrast properties. Phys Chem Chem Phys 2022; 24:29014-29023. [PMID: 36426648 DOI: 10.1039/d2cp03688f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Superparamagnetic nanocrystals of gadolinium orthoferrite (GdFeO3) with close to isometric morphology were successfully synthesized by heat treatment of gadolinium and iron(III) hydroxides obtained by direct co-precipitation with and without ultrasonic irradiation. The obtained samples were investigated by PXRD, low-temperature nitrogen adsorption-desorption isotherm measurements, HRTEM and VSM. It was established that ultrasonication during co-precipitation led to a decrease in the average size of GdFeO3 crystallites obtained after heat treatment by approximately 19%, an increase in their BET specific surface area by more than two times, a decrease in the degree of their aggregation by about five times and an improvement in their magnetic properties due to the increase in phase homogeneity. The colloidal solutions of the GdFeO3 nanoparticles synthesized using ultrasound were investigated by 1H NMR to measure the T1 and T2 relaxation times of water protons at 0.47 T. The resulting relaxivities r1 and r2 were approximately recalculated at 1.5, 3 and 4.7 T on the basis of a semi-statistical ad hoc method by analyzing the literature data for a number of structurally similar compounds with reported relaxivity values at different NMR frequencies. According to the experimental and predicted values of the r2/r1 ratio, the investigated GdFeO3 sample may be classified as a T1-contrast agent for MRI at 0.47 and 1.5 T, as a T1-T2 dual-modal contrast agent at 3 T and as a T2-contrast agent at 4.7 T.
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Affiliation(s)
- Yamen Albadi
- Saint Petersburg State Institute of Technology, 190013 Saint Petersburg, Russian Federation. .,Al-Baath University, 77 Homs, Syrian Arab Republic
| | - Maria S Ivanova
- Volga State University of Technology, 424000 Yoshkar-Ola, the Republic of Mari El, Russian Federation.,Resonance Systems GmbH, D-73230 Kirchheim unter Teck, Germany
| | - Leonid Y Grunin
- Volga State University of Technology, 424000 Yoshkar-Ola, the Republic of Mari El, Russian Federation.,Resonance Systems GmbH, D-73230 Kirchheim unter Teck, Germany
| | - Rodion A Makarin
- M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation
| | - Aleksei S Komlev
- M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation.,National Research Center "Kurchatov Institute", 123182 Moscow, Russian Federation
| | | | | | - Vadim I Popkov
- Ioffe Institute, 194021 Saint Petersburg, Russian Federation
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Ateia EE, Elsayed K, Ramadan R. Tuning the Properties of Ba-M Hexaferrite BaFe11.5Co0.5O19: A Road Towards Diverse Applications. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02341-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AbstractThe development of hexaferrite nanoparticles is scrutinized as potential sorbents for the removal of chromium (Cr) ions from aqueous chromium-containing solutions in a batch adsorption experiment. The transition metal Co doped BaFe12O19 hexaferrite compounds (BHF) have been synthesized successfully via citrate auto combustion technique. The structure, surface morphology and magnetic properties of the samples were studied. X-ray diffraction pattern ratifies the existence of hexagonal phase as a main phase for the prepared samples. The average crystallite sizes are found in the range of 47–49 nm. The high-resolution transmission electron microscopy (HRTEM), as well as the Fourier, transform infrared spectrophotometry results confirm an M-type hexagonal structure existing. The χ-T indicates the temperature-dependent ferromagnetic behavior of BHF nanoparticles. The derivative shows a single transition temperature Tc at 698 °C, and 710 °C for BHF and BCHF respectively. The prepared samples are utilized as an adsorbent for the removal of Cr (VI) from the aqueous solution. The maximum adsorption capacity (qm) of Cr (VI) on the nano hexaferrite is higher than that of various other adsorbents testified in the literature. The pseudo-second-order kinetic model gives a better fit to the experimental data.
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Ebabu W, Israil Hossain M, El-Naggar ME, Kechi A, Hailemariam SS, Ahmed FE. Exploration of Functional Polymers for Cleaner Leather Industry. J Inorg Organomet Polym Mater 2021. [DOI: 10.1007/s10904-021-02129-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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