Article
Chemistry, Inorganic & Nuclear
M. Ounacer, B. Rabi, E. Agouriane, A. Essoumhi, M. Sajieddine, B. F. O. Costa
Summary: This work investigates the coprecipitated magnetite and mixed ferrites of nickel-copper and nickel-zinc. Annealing at high temperature improves the crystallinity of the samples, with magnetite showing a polycrystalline spinel structure and the ferrites displaying a cubic spinel structure. The thermal treatment also causes the oxidation of magnetite into hematite. Morphological observations show that the shape of magnetite nanoparticles is nearly spherical, while the ferrite particles have irregular shapes and tend to aggregate. Magnetic curves reveal different behaviors for the ferrites, with the nickel-copper ferrites exhibiting a blocking temperature close to room temperature and the nickel-zinc ferrites having the lowest blocking temperature. The NZF sample also exhibits a higher M-s value and a narrow hysteresis loop, making it suitable for hyperthermia applications. Mossbauer studies provide insights into the superparamagnetic relaxation and the presence of Fe3+ in the ferrites.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Physics, Applied
Evrim Umut, Mustafa Coskun, Hakan Gungunes, Vincent Dupuis, Alexander S. Kamzin
Summary: The study compared superparamagnetic uncoated and silica-coated NiFe2O4@SiO2 nanoparticles with identical NiFe2O4 cores and found that the silica coating thickness significantly reduced the total magnetic anisotropy, allowing surface effects to manifest in the Mossbauer spectra. Additionally, Mossbauer spectra confirmed that reduced magnetization in uncoated NiFe2O4 nanoparticles was due to spin disorder, while silica coating enhanced spin canting on the NiFe2O4 surface.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2021)
Article
Materials Science, Ceramics
Rohit Ranga, Krishan Kumar, Ashok Kumar
Summary: A series of La3+ ion doped magnesium nickel ferrites were prepared and characterized for their structural and magnetic properties. The doping of La3+ ions resulted in a decrease in crystallite size, an increase in lattice parameter, and changes in magnetic properties. Additionally, the frequency and temperature variations affected the dielectric properties of the material.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
H. Jalili, B. Aslibeiki, A. Hajalilou, O. Musalu, L. P. Ferreira, M. M. Cruz
Summary: Recent studies have demonstrated the importance of the chemical composition and shape of magnetic nanoparticles in determining their properties. In this study, we synthesized cube-like nanoparticles and bimagnetic nanocomposites using an eco-friendly co-precipitation method. The nanocomposites exhibited good exchange-coupling interaction between the hard and soft magnetic phases, resulting in enhanced saturation magnetization. These materials showed promise for use in magnetic hyperthermia.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Rohit Ranga, Krishan Kumar, Ashok Kumar
Summary: In this study, Ce3+ ion-doped Mg0.5Ni0.5Fe2-xCexO4 ferrite nanoparticles were synthesized using the co-precipitation method. The effects of Ce3+ ion doping on the microstructure, crystallite size, magnetic, optical, and dielectric characteristics were investigated. The results showed that Ce3+ ion doping increased the lattice parameter and crystallite size, decreased the saturation magnetization, increased the band gap, and improved the dielectric properties of the nanoparticles. These nanoparticles have potential applications in ferrofluids and biomedical fields.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Antaz Ali, M. S. I. Sarker, Minhajul Islam, M. K. R. Khan, F. A. Khan, M. N. I. Khan, M. M. Rahman
Summary: In this study, the effect of In on superparamagnetic CoInxFe2-xO4 nanoparticles prepared through one step hydrothermal method was reported. The presence of In ions in the matrix was found to change the structural and magnetic properties of CoFe2O4, confirmed by XRD and magnetic analyses. The decrease in crystallite size and the range of particle size depending on In content were observed.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Physical
O. Kaman, D. Kubaniova, K. Knizek, L. Kubickova, M. Klementova, J. Kohout, Z. Jirak
Summary: The study focuses on hydrothermally prepared Mn-Zn ferrite nanoparticles, exploring the effects of cation distribution on magnetic properties. Various techniques including XRD, TEM, Fe-57 Mossbauer spectroscopy, and temperature-variable magnetic measurements were employed to analyze the characteristics of the nanoparticles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Hyung Joon Kim, Sung Wook Hyun, So Hee Kim, Hyunkyung Choi
Summary: Mn-Zn ferrite nanoparticles for magnetic hyperthermia applications were synthesized using a high temperature thermal decomposition method, with a maximum saturation magnetization of 83.2 emu/g. The results suggest that these synthesized nanoparticles have potential applications in the field of magnetic hyperthermia.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
C. Murugesan, L. Okrasa, K. Ugendar, G. Chandrasekaran, Xiaodi Liu, Dongfeng Diao, Jun Shen
Summary: The study investigates the structural, magnetic, and electrical properties of Mg1-xZnxFe2O4 nanoferrites synthesized using a solvent-free combustion route. The results show that the prepared samples have single-phase nature, and the size of the crystallites and the position of the vibrational modes vary with Zn. The magnetization is enhanced up to a certain point and then decreases, while the conductivity decreases gradually after a certain value.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
Oleg Bazaluk, Andrii Hrubiak, Volodymyr Moklyak, Maria Moklyak, Lina Kieush, Bogdan Rachiy, Ivan Gasyuk, Yurii Yavorskyi, Andrii Koveria, Vasyl Lozynskyi, Serhii Fedorov
Summary: This study presents a method for obtaining electrochemically active ultrafine composites of iron oxides, and shows that the presence of chelating agents during hydrothermal synthesis can enhance the electrochemical activity of the materials. The synthesized materials exhibit phase stability and specific discharge capacities with increased Coulomb efficiencies.
Article
Physics, Condensed Matter
O. I. Barkalov, S. V. Zaitsev, V. D. Sedykh
Summary: The crystal structure, short range order, lattice dynamics, and valence state of polycrystalline single-phase strontium ferrites SrFeO3-delta were studied using Raman and Mossbauer spectroscopy. It was found that only five or less bands were observed above 200 cm(-1) despite the predicted numerous Raman active phonon modes. Unusual magnetic correlations were found in all SrFeO3-delta perovskites.
SOLID STATE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
M. Sumalatha, S. Shravan Kumar Reddy, M. Sreenath Reddy, Suresh Sripada, M. Manivel Raja, Ch Gopal Reddy, P. Yadagiri Reddy, V. Raghavendra Reddy
Summary: In this study, cobalt ferrite doped with indium was synthesized using the sol-gel method, resulting in phase-pure samples with confirmed ferrimagnetic ordering. The cation distribution was obtained through the combined analysis of Raman and Fe-57 Mossbauer spectroscopy measurements, with the magnetic moment values matching qualitatively with experimental values.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Nguyen Thi Vuong Hoan, Nguyen Ngoc Minh, Nguyen Thi Lieu, Nguyen Van Thang, Vo Thang Nguyen, Nguyen Thi Thanh Tu, Tran Thanh Tam Toan, Nguyen Hoang Tuan, Duong Quang Nhan, Ho Van Minh Hai, Tran Ngoc Tuyen, Dinh Quang Khieu
Summary: The paper presents the synthesis of nickel ferrite and its application in determining uric acid through voltammetry. Nickel ferrite was prepared using a hydrothermal process with spherical carbons as a template, followed by calcination at 500 degrees C. The composition of iron and nickel in nickel ferrite could be controlled by the initial Fe/Ni molar ratio. The proposed method showed linear response for uric acid from 0.398 to 6.761 mu M, with a detection limit of 0.15 mu M. The recoveries for uric acid determination in human urine samples ranged from 95.15% to 104.8%, and no statistical difference was found compared to the HPLC method.
JOURNAL OF NANOPARTICLE RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Komal Arora, Preet Shikha, Rasha Mohamed Kamal Abdelbaky, Tejwant Singh Kang
Summary: The impact of doping Cr ion on La0.9Ce0.1Fe1-xCrxO3 nanoferrites synthesized by surface-active ionic liquid (SAIL) aided hydrothermal route was investigated, revealing the appearance of secondary phases, structural distortion, and changes in magnetic properties. The random occupancy of Cr at Fe-site resulted in a decrease in magnetization, while the use of SAILs facilitated directional growth of nanoparticles. This study helps to understand the role of Cr ion in modulating various physico-chemical properties of La0.9Ce0.1FeO3.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Editorial Material
Nanoscience & Nanotechnology
Pranaba K. Nayak
Summary: The analysis of the Mossbauer spectroscopy in the recent paper is flawed, as the authors did not properly analyze the room temperature spectra of the samples. Corrections are necessary for Figure 4, Tables S3 and S4, and the main text.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Ceramics
Y. Slimani, M. A. Almessiere, S. Guener, U. Kurtan, Sagar E. Shirsath, A. Baykal, I Ercan
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2020)
Article
Spectroscopy
Aysegul Ulku Metin, Mustafa Dogan, Umit Erdem, Taner Babacan, Hakan Gungunes
SPECTROSCOPY LETTERS
(2020)
Article
Chemistry, Multidisciplinary
M. A. Almessiere, Y. Slimani, A. Trukhanov, A. Baykal, H. Gungunes, E. L. Trukhanova, S. Trukhanov, V. G. Kostishin
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2020)
Article
Physics, Applied
Evrim Umut, Mustafa Coskun, Hakan Gungunes, Vincent Dupuis, Alexander S. Kamzin
Summary: The study compared superparamagnetic uncoated and silica-coated NiFe2O4@SiO2 nanoparticles with identical NiFe2O4 cores and found that the silica coating thickness significantly reduced the total magnetic anisotropy, allowing surface effects to manifest in the Mossbauer spectra. Additionally, Mossbauer spectra confirmed that reduced magnetization in uncoated NiFe2O4 nanoparticles was due to spin disorder, while silica coating enhanced spin canting on the NiFe2O4 surface.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2021)
Article
Energy & Fuels
U. Kurtan, H. Aydin, B. Buyuk, U. Sahinturk, M. A. Almessiere, A. Baykal
JOURNAL OF ENERGY STORAGE
(2020)
Article
Energy & Fuels
Hamide Aydin, Umran Kurtan, Muslum Demir, Selcan Karakus
Summary: Electrospun metal oxide-embedded carbon nanofibers have unique properties and excellent electrochemical performance for energy storage applications. In this study, a novel zirconia-based carbon nanofiber was successfully fabricated and applied as the electroactive material in a supercapacitor, demonstrating high specific capacitance and cycling stability.
Article
Energy & Fuels
Umran Kurtan, Hamide Aydin
Summary: The addition of organic bimetallic salts to polymer precursor for the fabrication of carbon nanofiber was investigated, leading to additional pore structures beneficial for electrochemical performance. The activated electrode exhibited high specific surface area and outstanding specific capacitance, with good capacitance retention and specific energy performance. This strategy holds great promise for energy-related applications.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Engineering, Electrical & Electronic
U. Kurtan
Summary: In this study, nanocube-embedded porous carbon nanofibers were successfully fabricated and used as electrode materials for supercapacitors, showing high specific capacitance, good energy storage performance, excellent cycle stability, and rate capability. The addition of ternary metallic salts played a significant role in improving the ultrastable energy storage systems, contributing to the high electrochemical cyclability and stability of the nanofibers.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hamide Aydin, Umran Kurtan, Burcu ustun, Serkan Naci Koc
Summary: A one-pot synthesis method was used to fabricate cobalt pyrophosphate nanoparticles combined with mesoporous carbon as an electrode material, exhibiting excellent electrochemical properties. Glutaraldehyde played a dual role in increasing the porous structure and enhancing the graphitization of the carbon.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Burcu Ustun, Hamide Aydin, Serkan Naci Koc, Umran Kurtan
Summary: Thiourea is utilized as a simple and effective method to produce N and S dual-doped carbon nanofibers. By adjusting the amount of thiourea in the polymer solution, the surface porosity is optimized. The optimized N/S-CNF5 exhibits high specific surface area, rich content of heteroatoms, and excellent electrochemical performance.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Burcu Ustun, Hamide Aydin, Serkan Naci Koc, Umran Kurtan
Summary: Amorphous zinc oxide incorporated with sulfur-doped carbon composite nanofiber (ZnO@S-CNF) was prepared through electrospinning and calcination for supercapacitor applications. Its self-supporting electrode achieved a high capacitance of 209 F/g at 1 A/g and sustained 158 F/g at 10 A/g. An asymmetric supercapacitor (ASC) assembled with ZnO@S-CNF as the positive electrode and carbon nanofiber as the negative electrode showed a specific energy of 11.2 Wh/kg at a specific power of 900 W/kg in the voltage range of 0-1.8 V. The enhanced performance was attributed to the increased surface area, micropore volume, and heteroatom content. This study provides a feasible approach for developing carbon composite electrodes with remarkable performance.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Energy & Fuels
Burcu Ustun, Hamide Aydin, Serkan Naci Koc, Umran Kurtan
Summary: Amorphous cobalt oxide nanoparticles were successfully synthesized in heteroatom-doped carbon nanofibers using electrospinning and carbonization techniques. The heteroatom doping improved the capacitance and stability of the nanostructure, while the amorphous cobalt oxide enhanced ion diffusion and electronic conduction. The resulting composite nanofibers exhibited superior electrochemical performance, with a specific capacitance of 172 F/g, good rate capability, high cycle performance, and a specific energy of 5.97 Wh/kg.
Review
Energy & Fuels
Hamide Aydin, Umran Kurtan, Burcu Ustun, Serkan Naci Koc, Eda Akgul, Muslum Demir
Summary: This review provides an overview of the recent advancements in transition metal borides for supercapacitors. It discusses the fabrication methods and their impact on the structure and surface chemistry of Ni, Co, bimetallic, or ternary borides. The review also delves into the capacitive energy-storage mechanisms, factors influencing electrochemical behavior, and various types of transition metal boride-based supercapacitors.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Inorganic & Nuclear
U. Kurtan, B. Ustun, H. Aydin, S. N. Koc
Summary: Nickel sulfides integrated with carbon were successfully synthesized using a solvothermal route, and exhibited high specific capacitances, providing a reference for the preparation of other metal sulfides as pseudocapacitive electrode materials.
DALTON TRANSACTIONS
(2023)
Article
Energy & Fuels
B. Ustun, H. Aydin, S. N. Koc, A. Uluslu, U. Kurtan
Summary: This study utilized a polyethylenimine (PEI) polymer to obtain freestanding, binder-free, and nitrogen-enriched carbon nanofibers (NCNFs) by electrospinning, which improved the performance of supercapacitors by adjusting the surface area and increasing the conductivity. The experimental results showed that specific surface area, nitrogen doping, and graphitization degree are significant factors affecting the performance of supercapacitors.
JOURNAL OF ENERGY STORAGE
(2023)
