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, 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
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
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
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
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
Mai M. El-Masry, Rania Ramadan
Summary: Cobalt ferrite, copper ferrite, and cobalt doped copper ferrite nanoparticles were synthesized and characterized, and they were found to be promising fillers for PVDF polymer, improving its optical and piezoelectric properties.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Ceramics
Atefeh Cheraghi, Fatemeh Davar, Maryam Homayoonfal, Akbar Hojjati-Najafabadi
Summary: In this study, cobalt ferrite magnetic nanoparticles were successfully synthesized using a modified Pechini method with lemon juice as the chelating agent. The nanoparticles exhibited cubic crystal structure with single-phase spinel, semi-spherical morphology, and varying saturation magnetization depending on the amount of lemon juice used. Furthermore, the nanoparticles were utilized for drug delivery, showing significant drug release at different pH levels.
CERAMICS INTERNATIONAL
(2021)
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
Materials Science, Composites
M. Megahed, D. E. Tobbala, M. A. Abd El-baky
Summary: Hybrid nanofillers loading has been used to fabricate multifunctional composites, with silica and cobalt ferrite nanoparticles combined to form a new hybrid composite structure in this study. The resulting hybrid nanocomposites showed improved mechanical properties compared to individually loaded nanoparticles or pristine composite materials. The SEM images revealed good fiber/matrix interfacial bonding in the hybrid composite.
POLYMER COMPOSITES
(2021)
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
Materials Science, Multidisciplinary
A. V. Ravindra, Shaohua Ju
Summary: Cobalt ferrite (CoFe2O4) nanoparticles with a size of 7-20 nm were easily synthesized by a microwave-hydrothermal route at temperatures of 100, 150, and 200 degrees C. The synthesized nanoparticles exhibited a pure spinel CoFe2O4 phase, high thermal stability, and a spherical morphology. The magnetic properties of the nanoparticles varied with synthesis temperature/particle size, with an increase in MS value and a decrease in Mr and Hc values as the temperature increased. The findings of this study provide insights into tailoring the properties of CoFe2O4 nanoparticles for specific applications using microwave-hydrothermal synthesis.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
Pablo Tancredi, Patricia C. Rivas-Rojas, Oscar Moscoso-Londono, Diego Muraca, Marcelo Knobel, Leandro M. Socolovsky
Summary: The study investigates how the magnetic behavior of a set of magnetically hard nanoparticles can be improved by modifying sample arrangement and matrix properties. The research found that magnetically oriented nanoparticles exhibit a significant enhancement in remanence and coercive field at low temperatures, especially for the hardest samples, achieving coercive field values of around 30 kOe.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
H. Ghorbani, M. Eshraghi, A. A. Sabouri Dodaran, P. Kameli, Stacey Protasowicki, Camron' Johnson, Daryoosh Vashaee
Summary: The low coercivity of spinel ferrites hinders their use in high-density magnetic recording. Doping magnetic ferrites with rare earth elements can effectively increase the coercivity field.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Physics, Applied
L. M. Martinez, J. A. Delgado, C. L. Saiz, A. Cosio, Y. Wu, D. Villagran, K. Gandha, C. Karthik, I. C. Nlebedim, S. R. Singamaneni
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Engineering, Environmental
Kinjal Gandha, Gaoyuan Ouyang, Shalabh Gupta, Vlastimil Kunc, M. Parans Paranthaman, Ikenna C. Nlebedim
Article
Nanoscience & Nanotechnology
Rubyann Olmos, Hector Iturriaga, Dawn S. Blazer, Sanaz Koohfar, Kinjal Gandha, Ikenna C. Nlebedim, Divine P. Kumah, Srinivasa R. Singamaneni
Article
Chemistry, Multidisciplinary
Denis Prodius, Kinjal Gandha, Anja-Verena Mudring, Ikenna C. Nlebedim
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2020)
Article
Chemistry, Applied
Rakesh P. Chaudhary, Kinjal H. Gandha, Fanqiang Meng, Emrah Simsek, Ikenna C. Nlebedim, Orlando Rios, Matthew J. Kramer, Ryan T. Ott
ACS COMBINATORIAL SCIENCE
(2020)
Article
Nanoscience & Nanotechnology
Kinjal Gandha, Ikenna C. Nlebedim, Vlastimil Kunc, Edgar Lara-Curzio, Robert Fredette, M. Parans Paranthaman
SCRIPTA MATERIALIA
(2020)
Article
Chemistry, Physical
M. Parans Paranthaman, Volkan Yildirim, Tej Nath Lamichhane, Benjamin A. Begley, Brian K. Post, Ahmed A. Hassen, Brian C. Sales, Kinjal Gandha, Ikenna C. Nlebedim
Article
Physics, Applied
Kinjal Gandha, Xubo Liu, Wei Tang, I. C. Nlebedim
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Applied
X. B. Liu, Kinjal Gandha, I. C. Nlebedim, M. Parans Paranthaman
Summary: The alignment of magnetic powder in anisotropic bonded magnets is influenced by the filling fraction, binder type, and processing parameters. A good alignment can be achieved through an alignment magnetic field that is approximately twice its coercivity.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Winnie M. Kiarie, Kinjal Gandha, David C. Jiles
Summary: The temperature-dependent magnetic properties of magnetorheological elastomers (MREs) were investigated. The magnetization curves of these materials overlap for different measured temperature values, but the saturation magnetization decreases with increasing temperature, while the differential susceptibility exhibits different trends. The magnetization response of these materials is only slightly sensitive to temperature changes, and it is highly dependent on particle loading fractions and particle orientation.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Chemistry, Physical
Rubyann Olmos, Shamsul Alam, Po-Hao Chang, Kinjal Gandha, Ikenna C. Nlebedim, Andrew Cole, Fazel Tafti, Rajendra R. Zope, Srinivasa R. Singamaneni
Summary: Hydrostatic pressure was applied to quasi two-dimensional CrBr3, leading to a decrease in saturation magnetization and Curie temperature. Density functional theory calculations showed a reduction in volume and interplanar distance with increasing pressure, and slight decrease in magnetocrystalline anisotropy energy, while the first nearest neighbor interaction increased slightly. The results match well with the experimental observations, indicating ferromagnetic interlayer coupling in CrBr3.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Kinjal Gandha, Rakesh P. Chaudhary, Matthew J. Kramer, Ryan T. Ott, Durga Paudyal, I. C. Nlebedim
Summary: This work systematically studies the Ce-Co based 1:5 permanent magnet alloys and investigates the impact of Co:Fe ratio on the hard-magnetic properties. The addition of Cu is found to improve the mutual solubility of Fe in the 1:5 phase. The research reveals that lower Fe content leads to a homogeneous microstructure and good magnetic properties, while a certain range of Fe content may result in the evolution of other phases. Furthermore, adding Fe enhances magnetization and Curie temperature, while increasing Cu content enhances coercivity.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Kinjal Gandha, M. P. Paranthaman, Brian C. Sales, Haobo Wang, Adrian Dalagan, Tej N. Lamichhane, David S. Parker, Ikenna C. Nlebedim
Summary: Anisotropic SmFeN bonded magnets were additively printed using SmFeN anisotropic magnetic particles in a polymeric binder PA12, achieving enhanced remanence and a maximum energy product. This study demonstrates advanced processing flexibility and the development of nylon bonded magnets designed for applications without critical rare earth magnets.
ENGINEERING REPORTS
(2021)
Meeting Abstract
Chemistry, Multidisciplinary
Denis Prodius, Kinjal Gandha, Cajetan Nlebedim
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Meeting Abstract
Chemistry, Multidisciplinary
Cajetan Nlebedim, Kinjal Gandha, Helena Khazdozian, Denis Prodius, Parans Paranthaman
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)