Article
Engineering, Electrical & Electronic
Ninad Velhal, P. B. Kashid, Gopal Kulkarni, D. C. Kulkarni, Hesham S. Almoalim, Sulaiman Ali Alharbi, Vijaya Puri, S. V. Prabhakar Vattikuti
Summary: Hexaferrites, including a cobalt-substituted barium hexaferrite with a mixed M+Y phase, were synthesized using a coprecipitation method. The hexaferrite exhibited low coercivity values and high microwave absorption properties, making it a potential candidate for MAMs and RAMs applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Muhammad Zarrar Khan, Iftikhar Hussain Gul
Summary: Our research provides a systematic study of the electrical, magnetic and microwave absorption properties of La-Co substituted Ba-Sr hexaferrite nanoparticles and MWCNTs encapsulated in a conductive polymer matrix. The synthesized samples showed good energy dissipation behavior and microwave absorption performance, highlighting their potential for reducing electromagnetic signatures in commercial and military applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Khalid Muajsam Batoo, Muhammad Hadi, Ritesh Verma, Ankush Chauhan, Rajesh Kumar, Mahavir Singh, Omar M. Aldossary
Summary: This study reports the synthesis of Ba-doped Co-Zn ferrite nanoparticles using the sol-gel auto combustion technique. Various analytical methods were used to confirm the structure, chemical purity, and physical properties of the samples. The findings showed changes in crystallite size, lattice parameter, magnetic properties, and EMI shielding effectiveness with increasing dopant concentration.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
L. M. Silva, R. B. da Silva, R. L. Silva, M. A. Morales, J. H. de Araujo
Summary: Ba-hexaferrite nanoparticles were synthesized using the ionic coordination reaction method, and the effect of La and Co ions on the magnetic properties of Ba0.7La0.3Fe12-xCoxO19 nanoparticles was investigated. It was found that the sample with x = 0.25 exhibited the highest (BH)max of 6.98 kJ/m3.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Xiaoqiong Wang, Hongyu Yan, Shichun Zhao, Shunquan Liu, Hong Chang
Summary: By doping with Sn4+ and Mn2+/Mn3+, the M-type BaFe12-y-2xAlySnxMnxO19 exhibits strong magnetic absorption at specific frequencies.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Ceramics
Manuel Haessner, Denis A. Vinnik, Rainer Niewa
Summary: The newly synthesized hexaferrite incorporates Pb2+ into the barium position, while iron and titanium fill octahedrally coordinated interstices in different ratios. Iron solely occupies tetrahedra and trigonal bipyramids. The compound exhibits ferrimagnetic behavior with a Curie temperature of 309.3 degrees C and undergoes a magnetic phase transformation to a ferromagnetic state at high magnetic field strengths and temperatures below -123 degrees C.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
P. T. Tho, C. T. A. Xuan, N. Tran, N. Q. Tuan, W. H. Jeong, S. W. Kim, T. Q. Dat, V. D. Nguyen, T. N. Bach, T. D. Thanh, D. T. Khan, B. W. Lee
Summary: Cu, Co, and Ti elements were co-doped to SrFe12O19, and it was found that the microwave absorption performance of SrFe12O19 can be significantly improved through co-doping. All samples showed good microwave absorption performance in terms of reflection loss and effective absorption bandwidth, with one sample exhibiting the ability to cover multiple microwave frequency bands.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Ngo Tran, Ruey-Bin Yang, Woo Hyun Jeong, Do Hung Manh, The-Long Phan, Bo Wha Lee
Summary: This study investigated the application of La-substituted barium hexaferrite in microwave absorption performance. The experimental results showed that doping with different concentrations of La can tune the magnetic properties and microwave absorption features of the material.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Physics, Applied
Sakyo Hirose, Yusuke Iguchi, Yoichi Nii, Tsuyoshi Kimura, Yoshinori Onose
Summary: This study investigated the microwave response of room-temperature multiferroic material. Microwave absorption attributed to magnetic resonances was observed in the frequency range of 6 to 20 GHz. The magnitude of the ferroelectric polarization depends on the sign of the microwave propagation vector, indicating nonreciprocal directional dichroism. This phenomenon can be controlled by external electric and magnetic fields, and the achieved magnitude of nonreciprocal directional dichroism is 11% at 300 K and 28% at 200 K. These microwave properties have potential practical applications in future wireless communications.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Ceramics
Ruoshui Liu, Lichen Wang, Xiang Yu, Zhiyi Xu, Huayang Gong, Tongyun Zhao, Fengxia Hu, Baogen Shen
Summary: The study demonstrates the enhancement of magnetocrystalline anisotropy (MA) in La-Co co-substituted strontium hexaferrite (La-Co SrM) due to the joint effect of Fe2+ and Co2+ ions. Co-substituted strontium hexaferrite SrFe12-xCoxO19 (Co-SrM) single crystals were grown to investigate the anisotropy of Co2+ single ions. The solubility of Co in this preparation condition is limited to 0.31, and for 0.03 < x <= 0.11, a 19% enhancement in uniaxial magnetic anisotropy field HA is observed, with only a 7% loss in saturation magnetization MS at 5 K. The enhanced HA of Co-SrM is even higher than that of La-Co SrM, making it suitable for use as permanent magnets in this concentration range. However, for x = 0.31, planar anisotropy is observed at 5 K. The potential nonlinear magnetic structure of Co-SrM remains to be discovered for magnetoelectric effects. This work serves as a significant complement to the magnetocrystalline anisotropy study of La-Co SrM.
CERAMICS INTERNATIONAL
(2023)
Article
Polymer Science
Ebtesam E. Ateia, Kareem Elsayed, Rania Ramadan
Summary: The development of hexaferrite nanoparticles as potential sorbents for the removal of chromium (Cr) ions from aqueous solutions is studied. Co-doped BaFe12O19 hexaferrite compounds are successfully synthesized and their structure, surface morphology, and magnetic properties are investigated. The nanoparticles exhibit high adsorption capacity for Cr (VI) and the pseudo-second-order kinetic model fits the experimental data well.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2022)
Article
Materials Science, Ceramics
Ying Qiang Jia, Wei Kun Luo, Lei Li, Shu Ya Wu, Xiang Ming Chen
Summary: MSO4 (M = Ca, Sr, Ba) ceramics with different structures and microwave dielectric properties were studied. The characteristics of BaSO4 and SrSO4 having near-zero tau(f) make them potential candidates for low epsilon(r) microwave dielectric ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Polymer Science
Svetoslav Kolev, Borislava Georgieva, Tatyana Koutzarova, Kiril Krezhov, Chavdar Ghelev, Daniela Kovacheva, Benedicte Vertruyen, Raphael Closset, Lan Maria Tran, Michal Babij, Andrzej J. Zaleski
Summary: The study investigated the microwave properties of polycrystalline Y-type hexaferrite used as a filler in a composite microwave-absorbing material, and found that the external magnetic field significantly affects the absorption performance by adjusting the attenuation peak frequency.
Article
Materials Science, Ceramics
Sachin Kumar Godara, Mandeep Singh, Varinder Kaur, S. B. Narang, Ashwani Kumar Sood
Summary: In this study, Ba1-xCaxFe12O19 samples were synthesized using sol-gel auto-combustion method, with the maximum calcium solubility observed at 1200 degrees C. The XRD data showed a decrease in lattice parameters and cell volume with increasing 'x', while FESEM images revealed an increase in particle size. Magnetic measurements indicated that the highest saturation magnetization was found in the x = 0.50 sample, with a decrease in coercivity as 'x' increased.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
M. A. Almessiere, Y. Slimani, N. A. Algarou, M. A. Gondal, Y. S. Wudil, M. Younas, I. A. Auwal, A. Baykal, A. Manikandan, T. Zubar, V. G. Kostishin, A. Trukhanov, I Ercan
Summary: The study prepared hard/soft nanocomposites using a sol-gel auto-combustion technique, showing complete exchange-coupled effects between phases and excellent electrodynamic parameters.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Environmental
Gopal Kulkarni, Priyanka Kandesar, Ninad Velhal, Varsha Phadtare, Aviraj Jatratkar, S. K. Shinde, Dae-Young Kim, Vijaya Puri
CHEMICAL ENGINEERING JOURNAL
(2019)
Article
Chemistry, Physical
Ninad Velhal, N. D. Patil, Gopal Kulkarni, S. K. Shinde, N. J. Valekar, H. C. Barshilia, Vijaya Puri
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Polymer Science
Gopal Kulkarni, Priyanka Kandesar, Ninad Velhal, Haekyoung Kim, Vijaya Puri
Summary: The study successfully synthesized coral cauliflower-like polypyrrole (PPy) hemispheres on an alumina substrate, which show excellent microwave absorption ability. The PPy thin film deposited at specific concentration exhibits strong absorption of electromagnetic radiation and can enhance the absorption characteristics of EM waves in a broad frequency region.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Ninad Velhal, P. B. Kashid, Gopal Kulkarni, D. C. Kulkarni, Hesham S. Almoalim, Sulaiman Ali Alharbi, Vijaya Puri, S. V. Prabhakar Vattikuti
Summary: Hexaferrites, including a cobalt-substituted barium hexaferrite with a mixed M+Y phase, were synthesized using a coprecipitation method. The hexaferrite exhibited low coercivity values and high microwave absorption properties, making it a potential candidate for MAMs and RAMs applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
O. C. Pore, A. Fulari, R. K. Kamble, A. S. Shelake, N. B. Velhal, V. J. Fulari, G. M. Lohar
Summary: Co3O4 nanostructures with different reaction times were synthesized using a hydrothermal method, with the 18-hour reaction time showing better electrochemical performance in terms of specific supercapacitance, sensitivity to glucose, and selectivity. These nanostructures exhibited excellent cyclic stability and maintained a high capacity retention over 1000 cycles.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Letter
Materials Science, Multidisciplinary
Seung Hyo Goo, Ninad B. Velhal, Jinyoung Park
Summary: Molecularly imprinted polymers (MIPs) are a promising technology for specific analyte detection. Structured MIP-coated sensors showed higher imprinting factors and sensitivities compared to planar MIP films, and demonstrated slightly increased selectivity coefficients due to the structuring effect of MIPs.
MRS COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Surendra K. Shinde, Swapnil S. Karade, Hemraj M. Yadav, Nagesh C. Maile, Gajanan S. Ghodake, Ajay D. Jagadale, Monali B. Jalak, Ninad Velhal, Raman Kumar, Dae Sung Lee, Dae-Young Kim
Summary: Metal oxides have attracted significant attention in recent decades for their improved structural, morphological, and electrochemical properties. A green approach using a choline chloride urea (CCU)-based deep eutectic solvent (DES) method was introduced for the synthesis of nanostructured CuO. The CuO sample obtained at 12 h of reaction time exhibited a porous nanograin-like surface morphology with excellent specific capacity and was successfully utilized in a CuO//activated carbon (AC) hybrid supercapacitor device, demonstrating noteworthy electrochemical performance and long-term stability.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Electrical & Electronic
O. C. Pore, A. Fulari, N. B. Velhal, V. G. Parale, H. H. Park, R. Shejwal, V. J. Fulari, G. M. Lohar
Summary: Nickel oxide nanostructures with various reaction temperatures were synthesized, and their performance in electrochemical supercapacitors and glucose sensing was evaluated. The results showed promising specific capacitance and glucose sensitivity for potential applications in energy storage and biosensing.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Materials Science, Ceramics
M. A. Yewale, A. A. Jadhavar, R. A. Kadam, N. B. Velhal, Umesh T. Nakate, A. M. Teli, J. C. Shin, L. N. Nguyen, D. K. Shin, N. K. Kaushik
Summary: In this study, manganese oxide nanoparticles were successfully synthesized using hydrothermal method at different pH values. The effect of pH variation on the structural and electrochemical properties of the synthesized nanoparticles was investigated. The results showed that the manganese oxide electrode prepared at pH 11 exhibited high specific capacitance and low resistance, indicating its potential application in supercapacitors.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Ninad B. Velhal, Tae Ho Yun, Junhyuck Ahn, Taewook Kim, Jisoo Kim, Changyong Yim
Summary: Different micro- and nanostructures of cobalt oxide are grown on Ni foam using surface-modifying agents via a simple one-pot hydrothermal synthesis process. The electrochemical measurements demonstrate that the dandelion flower-like morphology obtained via CTAB delivers the highest specific capacitance. The surface modification of Co3O4 material improved the charge storage performance of the electrodes for supercapacitor applications.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Ninad B. Velhal, Junhyuck Ahn, Tae Ho Yun, Taewook Kim, Minsu Gu, Jisoo Kim, Changyong Yim
Summary: In this study, a cobalt oxide (Co3O4) supercapacitor electrode was prepared using ultrafast annealing, leading to enhanced supercapacitive performance. The resulting Co3O4 material exhibited a coral reef-like morphology with a high surface area and a melted ice-like structure. The improved performance of the ultrafast annealed Co3O4 was attributed to its pseudocapacitive nature, unique morphology, and excellent cyclic stability. Assembled hybrid asymmetric supercapacitors showed a specific capacitance of 128.13 F/g with excellent retention capability over 5000 charge-discharge cycles.
ACS APPLIED ENERGY MATERIALS
(2023)
