Article
Biochemistry & Molecular Biology
Rocio Redon, Miriam D. Aviles-Avila, Leopoldo Ruiz-Huerta, Herlinda Montiel, Alex Elias-Zuniga, Lucy-Caterine Daza-Gomez, Oscar Martinez-Romero
Summary: By utilizing additive manufacturing and nanotechnology, magnetic cobalt ferrite and barium ferrite nanoparticles were incorporated into commercial resins and successfully transferred their magnetic properties to the final 3D-printed pieces through photopolymerization.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Crystallography
Mohamed S. A. Darwish
Summary: This study fabricated a series of photocatalysts based on magnetic ferrite nanostructures using a two-step co-precipitation technique. The fabricated magnetic photocatalysts were characterized using various methods. The results showed that MNPs exhibited outstanding performance as magnetic photocatalysts for the water-splitting process.
Article
Engineering, Electrical & Electronic
Kanchan Kumari, Rajesh Kumar, Partha Bir Barman
Summary: Cobalt ferrite films were grown using a solution method in the presence of a magnetic field, and the study revealed that the magnetic field influences both the crystallite size and magnetic properties of the films.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
M. Zareef Khan, Hur Abbas, K. Nadeem, Shahzad Ahmed, Awais Ghani
Summary: Bare BaFe12O19, CoFe2O4, and their nanocomposites with concentration percentage 30-70, 50-50 and 70-30 were synthesized by sol-gel approach. The agglomeration of nanocomposites was observed in TEM image with a mean particle size of 44 nm. Magnetic characterization showed that the magnetic properties of nanoparticles were influenced by the inter-particle interactions in the nanocomposites.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Ceramics
Xiaodong Jing, Mohan Guo, Ziyu Li, Ciyu Qin, Zitao Chen, Zuoguang Li, Huayang Gong
Summary: Rare earth doped cobalt ferrite nanoparticles were synthesized and the effect mechanism of rare earth ions replacing cobalt and iron ions on cobalt ferrite was studied. The different roles of rare earth dopants in changing cation distribution, structure, and magnetism properties were investigated, showing that rare earth doping can not only induce crystal structure changes but also improve particle distribution uniformity.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Riyatun, Triana Kusumaningsih, Agus Supriyanto, Budi Purnama
Summary: Silver-substituted cobalt ferrite (Ag0.02Co0.98Fe2O4) nanoparticles were sensitized through coprecipitation method. Increasing annealing temperature resulted in larger crystallite size and grain size. The redistribution of cations led to a perfect spinel structure. Higher annealing temperature led to increased saturation magnetization and coercive field. The antibacterial properties of Ag0.02Co0.98Fe2O4 were demonstrated through evaluation on S. aureus and E. coli, with the most significant effects observed at annealing temperature of 200 degrees C.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Chemistry, Physical
Thomas Dippong, Mihaela Diana Lazar, Iosif Grigore Deac, Petru Palade, Ioan Petean, Gheorghe Borodi, Oana Cadar
Summary: This study investigates the effect of Mn2+ substitution for Co2+ in CoFe2O4 embedded in a SiO2 matrix on the structural, surface, morphological, and magnetic properties. With an increase in Mn content, particle size increases and magnetic properties change accordingly. The mesoporous structure facilitates the release of fine nanoparticles in aqueous environment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Crystallography
Hector A. Chinchay-Espino, Gina M. Montes-Albino, Carlex M. Morales-Cruz, Segundo E. Dobbertin-Sanchez, Segundo Rojas-Flores
Summary: The effect of Co substitution on the structural and magnetic properties of BiFeO3 was studied, and Co-BiFeO3 nanopowders were successfully synthesized via the sol-gel method, exhibiting ferromagnetic properties at 15% Co doping.
Article
Chemistry, Multidisciplinary
Adam Szatmari, Rares Bortnic, Gabriela Souca, Razvan Hirian, Lucian Barbu-Tudoran, Fran Nekvapil, Cristian Iacovita, Emil Burzo, Roxana Dudric, Romulus Tetean
Summary: Co1-xZnxFe2O4 nanoparticles (0 <= x <= 1) were synthesized via a green sol-gel combustion method, and their characteristics were studied using various techniques. The nanoparticles showed high crystallinity and exhibited a cubic Fd-3m structure. The presence of cobalt, zinc, iron, and oxygen in the samples was confirmed through EDS analysis. Raman spectra revealed the preferential location of Zn ions in T sites for low Zn concentrations. The magnetic properties of the nanoparticles were discussed based on the Raman results, showing an increase in magnetization with increasing Zn content for x < 0.5. Co ferrite doped with 30% Zn exhibited the highest SAR values, which increased linearly with H from 20 to 60 kA/m.
Article
Chemistry, Physical
I. S. B. Ferraz, T. J. Castro, J. Mantilla, J. A. H. Coaquira, V. K. Garg, A. C. Oliveira, A. Franco Jr, P. C. Morais, S. W. da Silva
Summary: Aluminum-substituted cobalt ferrite nanoparticles synthesized by combustion reaction method exhibit excellent structural and property characteristics, making them promising candidates for applications in stress sensors, actuators, and magnetostrictive filters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Aleksey A. Nikitin, Anastasiia V. Prishchepa, Ruslan A. Rytov, Vladimir P. Chekhonin, Maxim A. Abakumov
Summary: The study investigates the remote magneto-mechanical actuation of biomolecules under the influence of external magnetic fields using magnetic nanoparticles. The results demonstrate a nonmonotonic dependence of mechanical destruction on the size of nanoparticles, indicating the crucial role of magneto-dipole interactions between nanoparticles. This finding contributes to the fine-tuning of magnetic nanoparticle properties for specific magneto-mechanical tasks.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Diana Zahn, Joachim Landers, Marco Diegel, Soma Salamon, Andreas Stihl, Felix H. Schacher, Heiko Wende, Jan Dellith, Silvio Dutz
Summary: This study reports the synthesis and characterization of high coercivity cobalt ferrite nanoparticles using a wet co-precipitation method. The results show that the properties of the nanoparticles, including crystallinity, coercivity, and magnetization, can be tuned by varying the synthesis conditions and atmosphere. The influence of cobalt fraction on the magnetic and structural properties of the particles is also investigated, revealing a direct correlation between high-field magnetization, an antiferromagnetic phase, and the estimated transition temperature.
Article
Materials Science, Multidisciplinary
Akmal Johan, Dedi Setiabudidaya, Fitri Suryani Arsyad, Ramlan, Wisnu Ari Adi
Summary: This research investigates the effect of La3+ dopant ion on the reflection loss characteristics of cobalt zinc ferrite. The samples were synthesized through solid state reaction followed by sintering, and their particle morphology, elemental composition, and magnetic properties were analyzed. The presence of Zn in the cobalt ferrite structure determines the ferromagnetic strength, and the optimum composition was found to exhibit significant microwave absorption at specific frequencies.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Qing Lin, Fang Yang, Qian Zhang, Kaimin Su, Huiren Xu, Yun He, Jinpei Lin
Summary: In this study, A(y)B(1-y)C(x)Fe(2-x)O(4) (C=Ho,Gd,Al) ferrite powders were synthesized by the sol-gel combustion route. The X-ray diffraction results confirmed the compositions of single-phase cubic ferrites within the CoHoxFe2-xO4 range. The substitution of Ho3+ ions decreased the saturation magnetization of CoHoxFe2-xO4, while the coercivity initially increased and then decreased with the increase of the calcination temperature. The Mossbauer spectra indicated a ferrimagnetic behavior of CoHoxFe2-xO4 with two normal split Zeeman sextets. The magnetic hyperfine field decreased due to Ho3+ substitution, which led to a decrease in A-B super-exchange by the paramagnetic rare earth ions. The X-ray diffraction results also confirmed the compositions of single-phase cubic ferrites within the Mg0.5Zn0.5CxFe2-xO4 (C=Gd,Al) range. The variation in average crystalline size and lattice constant was related to the doping of gadolinium and aluminum ions. The saturation magnetization showed a significant change with increasing gadolinium and aluminum ions, and the coercivity increased. The AlMg0.5Zn0.5FeO4 ferrite exhibited ferrimagnetic and paramagnetic character with the replacement of Gd3+ ions and paramagnetic character with the replacement of Al3+ ions. The isomer shift values indicated the presence of Fe3+ ions.
Article
Biochemistry & Molecular Biology
Thomas Dippong, Erika Andrea Levei, Ioan Petean, Iosif Grigore Deac, Raluca Anca Mereu, Oana Cadar
Summary: The impact of doping with different cations on the properties of CoFe2O4 nanoparticles synthesized via sol-gel method and calcined at different temperatures was investigated. The study found that doping cations affect the structural, thermal, kinetics, morphological, surface, and magnetic properties of the nanoparticles. Calcination at low temperatures results in low crystallinity while high temperatures lead to well-crystallized ferrites together with crystalline phases of the silica matrix. The structural and magnetic parameters of the nanoparticles also depend on the doping ion and calcination temperature.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)