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Journal articles on the topic 'Cobalt nanoparticles'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Kumar, Yogendra, Avinash Kumar pandey, Pragya Singh, Man Vir Singh, Waseem Raza, and Imran Hasan. "Utilization of synthesized cobalt ferrite nanoparticles to harness their electrochemical characteristics." Nanomaterials and Energy 13, no. 4 (2024): 1–30. http://dx.doi.org/10.1680/jnaen.23.00110.

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The cobalt ferrite nanoparticles were synthesized using cobalt nitrate and ferric nitrate as precursor material by combustion method using sucrose as a fuel. The cobalt ferrite nanoparticle materials were analyzed through FESEM (Field emission scanning electron microscope) and XRD (X-ray diffraction) spectroscopy. FESEM and XRD techniques reveal that the cobalt ferrite particles are in the crystallite nano range and their size of 10-14 nm. The cobalt ferrite nanoparticle materials have been thermally analyzed by Mettler Todelo and TGA/DSC 3+ model; the nanoparticles were found thermally stable

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2

A, Selvam, Sheik Muhideen Badhusha M, Rajula Jasmine Usha J, Muthuchudarkodia R.R, and Ramesh Kumar S. "Bio synthesis and characterization of Cobalt oxide nanoparticles using aqueous extract of Moringa oleifera leaves." International Journal of Zoology and Applied Biosciences 7, no. 6S (2022): 57–62. http://dx.doi.org/10.55126/ijzab.2022.v07.i06.sp013.

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Recently the green synthesis of nanoparticles involving plant extract has attracted the attention of researchers. In this work we present an environmentally friendly, one step, ultra-fast, cost-efficient method for producing cobalt oxide nanoparticles using readily available Moringa Oleifera (Drumstick) extracts as reducing and capping agent. The bio-reduced cobalt nanoparticles were appropriately characterized. The cobalt oxide nanoparticles are characterized by UV-DRS, IR, powder XRD, SEM and EDX. To characterize the crystal phase identification of the nanoparticle, X-ray Powder Diffraction

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3

Ardeleanu, Helmina, Gabriel Ababei, Marian Grigoras, et al. "Cobalt Ferrite Nanoparticles Capped with Perchloric Acid for Life-Science Application." Crystals 13, no. 7 (2023): 1058. http://dx.doi.org/10.3390/cryst13071058.

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Among the modern oncological therapies, one of the most promising is based on tumor hyperthermia with magnetic nanoparticles resulting from the crystallization of iron and cobalt oxides. We synthesized core–shell magnetic nanoparticles of perchlorate-CoxFe3−xO4 (x = 0; 0.5; 1.0) via the co-precipitation method and stabilized them in aqueous suspensions. Fine granulation of the dispersed ferrophase was revealed by Transmission Electron Microscopy and Dynamical Light Scattering, with FTIR data detailing the surface-interaction phenomena. X-ray diffractometry revealed specific crystallization fea

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4

V, Devi Rajeswari, and Menaka Priya Balaji. "A Comprehensive Review of the Parameters and Factors Affecting the Morphology of Cobalt Nanoparticles Synthesized Using Green Methodology and their Applications." Der Pharma Chemica 15, no. 6 (2023): 5. https://doi.org/10.5281/zenodo.13353348.

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Green mediated transition metal nanoparticles have received great attention in scientific and technological fields due to their catalytic and magnetic properties. Currently, cobalt oxide is gaining interest in the environmental and biomedical fields because of its high exciton binding energy and magnetic properties. In the nano technological area, researchers always prefer the physical and chemical approach to the biological approach due to the uncontrollable morphological changes during the synthesis of particles. But biologically mediated nanoparticles are considered to have a synergistic ef

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5

V, Devi Rajeswari, and Priya Balaji Menaka. "A Comprehensive Review of the Parameters and Factors Affecting the Morphology of Cobalt Nanoparticles Synthesized Using Green Methodology and their Applications." DER PHARMA CHEMICA 15, no. 6 (2023): 5. https://doi.org/10.4172/0975-413X.15.6.122-126.

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Green mediated transition metal nanoparticles have received great attention in scientific and technological fields due to their catalytic and magnetic properties. Currently, cobalt oxide is gaining interest in the environmental and biomedical fields because of its high exciton binding energy and magnetic properties. In the nano technological area, researchers always prefer the physical and chemical approach to the biological approach due to the uncontrollable morphological changes during the synthesis of particles. But biologically mediated nanoparticles are considered to have a synergistic ef

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6

Larrude, D. G., P. Ayala, M. E. H. Maia da Costa, and F. L. Freire. "Multiwalled Carbon Nanotubes Decorated with Cobalt Oxide Nanoparticles." Journal of Nanomaterials 2012 (2012): 1–5. http://dx.doi.org/10.1155/2012/695453.

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Multiwalled carbon nanotubes (MWCNTs) synthesized by spray pyrolysis were decorated with cobalt oxide nanoparticles using a simple synthesis route. This wet chemistry method yielded nanoparticles randomly anchored to the surface of the nanotubes by decomposition of cobalt nitrate hexahydrate diluted in acetone. Electron microscopy analysis indicated that dispersed particles were formed on the MWCNTs walls. The average size increased with the increasing concentration of cobalt nitrate in acetone in the precursor mixture. TEM images indicated that nanoparticles were strongly attached to the tube

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7

ASHIBUDIKE, Odili Endurance, and Benjamin Ufuoma OREKO. "BIOCHEMICAL SYNTHESIS AND CHARACTERISATION OF COBALT NANOPARTICLES." European Journal of Materials Science and Engineering 8, no. 2 (2023): 86–95. http://dx.doi.org/10.36868/ejmse.2023.08.02.086.

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There is a need for competitive techniques for the synthesis of nanomaterials in the materials science research industry. Nanomaterials have significant relevance in the emerging technologies and cobalt nanoparticle being a modern nanomaterial is in high demand in this regard. In this research, cobalt nanoparticles have been synthesised through a simplified combined chemical-plant based technique which is non-toxic to the environment and most importantly less time consuming. The obtained cobalt nanoparticles were crystalline with uniformly distributed sizes, spherical in shape with little pore

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8

Wen, Xiaogang, Lin Gu, and Alexander M. Bittner. "Simple Electroless Synthesis of Cobalt Nanoparticle Chains, Oriented by Externally Applied Magnetic Fields." Zeitschrift für Physikalische Chemie 232, no. 9-11 (2018): 1631–46. http://dx.doi.org/10.1515/zpch-2018-1135.

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Abstract The electroless (chemical) deposition of cobalt on palladium-sensitized oxidized silicon wafers produces nanowires and chains made up by nanoparticles. We demonstrate that the application of moderate magnetic fields, provided by permanent magnets, during the growth produces highly oriented cobalt nanowires and nanoparticle chains. By adjusting the magnetic field direction in plane, parallel and crossed cobalt chain patterns are readily accessible. Perpendicular orientation of the field results in rod-like, standing-up chains of nanoparticles. We explain the observed structures with ma

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9

Moreau, Nicolas, Antonio Fonseca, Danilo Vuono, et al. "Physical Methods for the Preparation of Cobalt Nanoparticles for Use in the Synthesis of Multiwalled Carbon Nanotubes." Inorganics 13, no. 1 (2024): 7. https://doi.org/10.3390/inorganics13010007.

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The aim of this work was to obtain cobalt nanoparticles through a physical method, which could be formed simultaneously during the Catalytic Chemical Vapour Deposition (CCVD) synthesis of carbon nanotubes, under conditions suitable for both carbon nanotube synthesis and Co-nanoparticle formation. Co nanoparticles were prepared by Physical Vapour Deposition (PVD) using a 0.05 m3 magnetron on two different substrates, SiO2/Si and C, followed by a reduction treatment in an H2 atmosphere. Transmission Electron Microscopy (TEM) and Field Enhanced Scanning Electron Microscopy (FE-SEM) were used to c

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10

Srivastava, Rishabh, Shiva Bhardwaj, Anuj Kumar, et al. "Waste Citrus reticulata Assisted Preparation of Cobalt Oxide Nanoparticles for Supercapacitors." Nanomaterials 12, no. 23 (2022): 4119. http://dx.doi.org/10.3390/nano12234119.

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The green, sustainable, and inexpensive creation of novel materials, primarily nanoparticles, with effective energy-storing properties, is key to addressing both the rising demand for energy storage and the mounting environmental concerns throughout the world. Here, an orange peel extract is used to make cobalt oxide nanoparticles from cobalt nitrate hexahydrate. The orange peel extract has Citrus reticulata, which is a key biological component that acts as a ligand and a reducing agent during the formation of nanoparticles. Additionally, the same nanoparticles were also obtained from various

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11

Ali, N. W. "Green Synthesis of Cobalt Nanoparticles and their Application in Removal of Lead from Polluted Water." BASRA JOURNAL OF SCIENCE 39, no. 2 (2021): 292–305. http://dx.doi.org/10.29072/basjs.202129.

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Cobalt nanoparticles were synthesized by reduction-oxidation method. The reaction was done using cobalt salts as the source of metal and eucalyptus leaf as a reducing material and trisodium citrate used as capping agent. The creation of the cobalt nanoparticles was monitored using UV-Vis spectroscopy. The UV-Vis spectroscopy shown the formation of cobalt nanoparticles by exhibing the typical surface plasmon absorption maximum at 570 nm. Fourier transform infrared spectra (FTIR) used for characterization of eucalyptus leaf some functional groups that related with cobalt nanoparticles was showed

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12

Leng, Ying, Kai Jin, Tian Wang, and Hui Sun. "Facile Preparation of Cobalt Nanoparticles Encapsulated Nitrogen-Doped Carbon Sponge for Efficient Oxygen Reduction Reaction." Polymers 15, no. 3 (2023): 521. http://dx.doi.org/10.3390/polym15030521.

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The facile preparation of non-noble metal nanoparticle loaded carbon nanomaterials is promising for efficient oxygen reduction reaction (ORR) electrocatalysis. Herein, a facile preparation strategy is proposed to prepare nitrogen-doped carbon sponge loaded with fine cobalt nanoparticles by the direct pyrolysis of the cobalt ions adsorbed polymeric precursor. The polymeric sponge precursor with continuous framework and high porosity is formed by the self-assembly of a poly(amic acid). Taking advantage of the negatively charged surface and porous structure, cobalt ions can be efficiently adsorbe

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13

Alotaibi, M. A., I. Ud Din, A. I. Alharthi, et al. "Synthesis, Characterization, and Magnetic Behavior of Cobalt-Ferrite Nanoparticles under Variant Temperature Conditions." Физика твердого тела 63, no. 4 (2021): 513. http://dx.doi.org/10.21883/ftt.2021.04.50746.pss109.

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Wet chemical method was applied for the synthesis of cobalt-ferrite nanoparticles. The physicochemical properties were investigated by number of analytical techniques. TGA revealed the thermal stability of synthesized cobalt-ferrite nanoparticles. X-ray diffraction studies displayed the nanoparticles crystalline nature. Structure of cobalt-ferrite nanoparticles was confirmed via infrared spectroscopy by manifesting Co and Fe ions absorption peaks. Morphological studies showed synthesis of nanoparticles of cobalt-ferrite by employing field emissions scanning electron microscopy. The magnetic pr

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14

Alotaibi, M. A., I. Ud Din, A. I. Alharthi, et al. "Synthesis, Characterization, and Magnetic Behavior of Cobalt-Ferrite Nanoparticles under Variant Temperature Conditions." Физика твердого тела 63, no. 4 (2021): 513. http://dx.doi.org/10.21883/ftt.2021.04.50746.pss109.

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Wet chemical method was applied for the synthesis of cobalt-ferrite nanoparticles. The physicochemical properties were investigated by number of analytical techniques. TGA revealed the thermal stability of synthesized cobalt-ferrite nanoparticles. X-ray diffraction studies displayed the nanoparticles crystalline nature. Structure of cobalt-ferrite nanoparticles was confirmed via infrared spectroscopy by manifesting Co and Fe ions absorption peaks. Morphological studies showed synthesis of nanoparticles of cobalt-ferrite by employing field emissions scanning electron microscopy. The magnetic pr

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15

Khizar, Sumera, Nasir M. Ahmad, Naveed Ahmed, et al. "Aminodextran Coated CoFe2O4 Nanoparticles for Combined Magnetic Resonance Imaging and Hyperthermia." Nanomaterials 10, no. 11 (2020): 2182. http://dx.doi.org/10.3390/nano10112182.

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Aminodextran (AMD) coated magnetic cobalt ferrite nanoparticles are synthesized via electrostatic adsorption of aminodextran onto magnetic nanoparticles and their potential theranostic application is evaluated. The uncoated and aminodextran-coated nanoparticles are characterized to determine their hydrodynamic size, morphology, chemical composition, zeta potential and magnetization. The aminodextran containing cobalt ferrite nanoparticles of nanometer size are positively charged in the pH range from 3 to 9 and exhibit saturation magnetization of 50 emu/g. The magnetic resonance imaging (MRI) i

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16

Lee, Min-Jae, and A. Young Sung. "Characterization and Compatibility of High Oxygen Permeable Ophthalmic Biomaterial Containing Silane with Cobalt Oxide Nanoparticles." Journal of Nanoscience and Nanotechnology 20, no. 11 (2020): 6954–58. http://dx.doi.org/10.1166/jnn.2020.18819.

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This research is conducted to analyze the compatibility of used monomers and produce the high functional hydrogel ophthalmic polymer containing silane and nanoparticles. Vinyltrimethoxysilane (VTMS) and cobalt oxide nanoparticles are used as additives for the basic combination of silicone monomer (Sil-H) and methyl methacrylate (MMA). And also, the materials are copolymerized with ethylene glycol dimethacrylate (EGDMA) as the cross-linking agent, photo polymerization initiator (2H2M) as the initiator. It is judged that the lenses of all combinations are optically excellent and thus have good c

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17

Borgese, Marina, Federica Rossi, Patrizia Bonfanti, et al. "Recovery ability of human adipose stem cells exposed to cobalt nanoparticles: outcome of dissolution." Nanomedicine 15, no. 5 (2020): 453–65. http://dx.doi.org/10.2217/nnm-2019-0195.

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Aim: To demonstrate that cobalt nanoparticles doses are safe for use in humans and to understand the consequences of the particulate effects, which may persist inside the cells. Materials & methods: Human adipose stem cells were used. We evaluated cell recovery by viability test, morphology and ultrastructure using electronic and optical microscopy, while gene expression was assessed utilizing real-time PCR. Results: After exposure, most stem cells recovered their normal function. Co3O4-nanoparticles remained inside the cell for the entirety of the considered time. A slight modification of

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18

Sulaiman, Jameel M. A., Suhad M. Hamdoon, and Ghada Y. Abdulrahman. "Antibacterial Activity of Cobalt Ferrite (CoFe₂O₄) Nanoparticles against Oral Enterococci." Materials Science Forum 1021 (February 2021): 150–59. http://dx.doi.org/10.4028/www.scientific.net/msf.1021.150.

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This study aimed to show the enhanced effect of nanoparticles cobalt ferrite CoFe2O4 with chlorhexidine on Enterococcus faecium isolated from failure root canal treatment cases. Sol-gel technique was used to prepare the spinel cobalt ferrite CoFe2O4 at 200 °C then sintering at 400 °C & 600 °C, whereas the antimicrobial susceptibility test of nanoparticles was carried out according to the Kirby-Bauer technique compared with chlorhexidine. Fifteen isolates of Enterococcus faecium obtained by inserting sterile paper points in root canals, from patients who consulted the Teaching Hospital of D

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19

Andrade, Priscyla L., Valdeene A. J. Silva, Kathryn L. Krycka, et al. "The effect of organic coatings in the magnetization of CoFe₂O₄ nanoparticles." AIP Advances 12, no. 8 (2022): 085102. http://dx.doi.org/10.1063/5.0078167.

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Cobalt ferrite has attracted considerable attention in recent years due to its unique physical properties, such as high Curie temperature, large magnetocrystalline anisotropy, high coercivity, moderate saturation magnetization, large magnetostrictive coefficient, and excellent chemical stability and mechanical hardness. This work focuses on the neutron scattering results of the magnetic response characteristics of polysaccharide fucan coated cobalt ferrite nanoparticles for their application as a solid support for enzyme immobilization and other biotechnology applications. Here, we unambiguous

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20

Seo, Deok Min, Myung Gwan Hahm, and Young Lae Kim. "Bundle Size Engineering of Single-Walled Carbon Nanotubes on Silica Nanoparticles." Journal of Nanomaterials 2017 (2017): 1–6. http://dx.doi.org/10.1155/2017/6379358.

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Small and large single-walled carbon nanotubes (SWCNTs) bundles from different-sized cobalt catalyst clusters have been synthesized and prepared through chemical vapor deposition (CVD) method by using Co-acetate ethanol solution with silica nanoparticles. By controlling concentration of Co-acetate ethanol solution (0.2 wt% and 0.4 wt%), various sizes and types of bundle of SWCNTs are grown on the silica nanoparticle substrates. Synthesized SWCNT’s diameter ranged from 0.92 nm to 1.63 nm, and chirality of SWCNTs and their electronic property from high concentration solution show diverse charact

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21

Mizoshiri, Mizue, Kyohei Yoshidomi, Namsrai Darkhanbaatar, Evgenia M. Khairullina, and Ilya I. Tumkin. "Effect of Substrates on Femtosecond Laser Pulse-Induced Reductive Sintering of Cobalt Oxide Nanoparticles." Nanomaterials 11, no. 12 (2021): 3356. http://dx.doi.org/10.3390/nano11123356.

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Direct writing of cobalt/cobalt oxide composites has attracted attention for its potential use in catalysts and detectors in microsensors. In this study, cobalt-based composite patterns were selectively formed on glass, polyethylene naphthalate (PEN), and polyethylene terephthalate (PET) substrates via the femtosecond laser reductive sintering of Co3O4 nanoparticles in an ambient atmosphere. A Co3O4 nanoparticle ink, including the nanoparticles, ethylene glycol as a reductant, and polyvinylpyrrolidone as a dispersant, was spin-coated onto the substrates. Near-infrared femtosecond laser pulses

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22

Jha, Anal K., and Kamal Prasad. "Biological synthesis of cobalt ferrite nanoparticles." Nanotechnology Development 2, no. 1 (2012): 9. http://dx.doi.org/10.4081/nd.2012.e9.

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A low-cost green and reproducible yeast (<em>Saccharomyces cerevisiae</em>) mediated biosynthesis of cobalt ferrite nanoparticles is reported. The synthesis is performed at close to room temperature in the laboratory. X-ray, Fourier transform infrared spectroscopy and high resolution transmission electron microscopy analyses are performed to ascertain the formation of cobalt ferrite nanoparticles. Individual nanoparticles, as well as a very few aggregate having the size of 3-15 nm, were found. The vibrating sample magnetometer measurement showed superparamagnetic behavior in cobalt

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23

Moradpoor, Hedaiat, Mohsen Safaei, Farzad Rezaei, et al. "Optimisation of Cobalt Oxide Nanoparticles Synthesis as Bactericidal Agents." Open Access Macedonian Journal of Medical Sciences 7, no. 17 (2019): 2757–62. http://dx.doi.org/10.3889/oamjms.2019.747.

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AIM: With the increased bacterial resistance and the resulting problems in recent years, it seems necessary to find new biocompatible compounds to confront this problem. This research was conducted to optimise the synthesis of cobalt oxide nanoparticles with the highest antibacterial activity. METHODS: In the present study, 9 experiments were designed using the Taguchi method. The effect of three factors of cobalt nitrate, KOH and the stirring time in the synthesis of cobalt oxide nanoparticles with the highest antibacterial activity was investigated. The bactericidal effect of synthesis

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24

Chitra, Raguram T, and S. Rajni K. "Microstructural and Magnetic Properties of Cobalt Ferrite Nanoparticles Synthesized by Sol Gel Technique." International Journal of Trend in Scientific Research and Development 2, no. 5 (2018): 371–77. https://doi.org/10.31142/ijtsrd15871.

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Cobalt ferrite CoFe2O4 , an inverse spinal ferrite has high permeability, good saturation 1magnetization and no preferred direction of magnetization, high Curie temperature, and high electromagnetic performance. In the present work 0.2M cobalt nitrate 0.3M ferric nitrate and 0.4 M citric acid is used to synthesis cobalt ferrite nanoparticle by sol gel technique. As the magnetic property depends on the grain size of the synthesized nanoparticle, metal nitrate to citric acid ratio is varied from 0.8, 0.6 and 0.4 and the structural, functional morphological and magnetic characteristics are analyz

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AKBAR, L., K. ALI, M. SAJJAD, et al. "ENHANCEMENT IN OPTICAL PROPERTIES OF COBALT DOPED TiO2 NANOPARTICLES." Digest Journal of Nanomaterials and Biostructures 15, no. 2 (2020): 329–35. http://dx.doi.org/10.15251/djnb.2020.152.329.

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Cobalt doped titanium dioxide has consumed great consideration because of their photo catalytic activity and numerous utilizations in paints, white pigments and tooth paste. The co-precipitation technique was utilized in this present study to produce titanium dioxide nanoparticles using (TTIP) titanium tetra iso-propoxide and cobalt nitrate as a starting precursor. Cobalt doped TiO2nanoparticles were synthesized up to four to seven percent of cobalt composition. The Morphology of nanoparticles, crystal structure and optical characteristics were analyzed by XRD, UV-vis spectroscopy and scanning

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Govindasamy, Rajakumar, Vaishnavi Raja, Sonalika Singh, et al. "Green Synthesis and Characterization of Cobalt Oxide Nanoparticles Using Psidium guajava Leaves Extracts and Their Photocatalytic and Biological Activities." Molecules 27, no. 17 (2022): 5646. http://dx.doi.org/10.3390/molecules27175646.

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The advanced technology for synthesizing nanoparticles utilizes natural resources in an environmentally friendly manner. Additionally, green synthesis is preferred to chemical and physical synthesis because it takes less time and effort. The green synthesis of cobalt oxide nanoparticles has recently risen due to its physico-chemical properties. In this study, many functional groups present in Psidium guajava leaf extracts are used to stabilize the synthesis of cobalt oxide nanoparticles. The biosynthesized cobalt oxide nanoparticles were investigated using UV-visible spectroscopic analysis. Ad

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27

Huang, Huanshao, Jiajun Wang, Junai Zhang, Jiye Cai, Jiang Pi, and Jun-Fa Xu. "Inspirations of Cobalt Oxide Nanoparticle Based Anticancer Therapeutics." Pharmaceutics 13, no. 10 (2021): 1599. http://dx.doi.org/10.3390/pharmaceutics13101599.

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Cobalt is essential to the metabolism of all animals due to its key role in cobalamin, also known as vitamin B12, the primary biological reservoir of cobalt as an ultra-trace element. Current cancer treatment strategies, including chemotherapy and radiotherapy, have been seriously restricted by their side effects and low efficiency for a long time, which urges us to develop new technologies for more effective and much safer anticancer therapies. Novel nanotechnologies, based on different kinds of functional nanomaterials, have been proved to act as effective and promising strategies for antica

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Nandiyanto, Asep Bayu Dani, Yustika Desti Yolanda, Mia Widyaningsih, et al. "Techno-Economic Evaluation of the Production of Dysprosium-Doped Cobalt Ferrites Nanoparticles by Sol-Gel Auto-Combustion Method." Mathematical Modelling of Engineering Problems 9, no. 4 (2022): 1152–59. http://dx.doi.org/10.18280/mmep.090435.

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The purpose of this study was to examine two models of the economic feasibility of producing nanoparticle of dysprosium-doped cobalt ferrites by sol-gel auto-combustion method, from a laboratory scale to an industrial scale, including technical analysis and economic evaluation. Various economic evaluation parameters were analyzed to report the fabrication potential of dysprosium-doped cobalt ferrites nanoparticles in the case of the time required for a speculation to recover its total initial expenditure (PBP), the conditions of a generating project in the production function in years (CNPV),

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Tan, Zejiu, Linhua Deng, Zhongjing Jiang, et al. "Selenium Nanoparticles Attenuate Cobalt Nanoparticle-Induced Skeletal Muscle Injury: A Study Based on Myoblasts and Zebrafish." Toxics 12, no. 2 (2024): 130. http://dx.doi.org/10.3390/toxics12020130.

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Cobalt alloys have numerous applications, especially as critical components in orthopedic biomedical implants. However, recent investigations have revealed potential hazards associated with the release of nanoparticles from cobalt-based implants during implantation. This can lead to their accumulation and migration within the body, resulting in adverse reactions such as organ toxicity. Despite being a primary interface for cobalt nanoparticle (CoNP) exposure, skeletal muscle lacks comprehensive long-term impact studies. This study evaluated whether selenium nanoparticles (SeNPs) could mitigate

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Kahani, Seyed Abolghasem, and Massumeh Khedmati. "Mechanochemical Preparation of Cobalt Nanoparticles through a Novel Intramolecular Reaction in Cobalt(II) Complexes." Journal of Nanomaterials 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/246254.

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A novel solid state reaction involving a series of cobalt(II) hydrazine-azides has been used to prepare metallic cobalt nanoparticles. The reactions of [Co(N2H4)(N3)2], [Co(N2H4)2(N3)2], and [Co(N2H4)(N3)Cl]·H2O via NaOH, KOH as reactants were carried out in the solid state. These complexes undergo an intramolecular two-electron oxidation-reduction reaction at room temperature, producing metallic cobalt nanoparticles (Co1–Co6). The aforementioned complexes contain cobalt(II) that is an oxidizing agent and also hydrazine ligand as a reducing agent. Other products produced include sodium azide a

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Gegechkori, Tatiana, Grigor Mamniashvili, Tinatin Zedginidze, and Tamar Petriashvili. "Electroless Synthesis of Cobalt Nanowires in Magnetic Field and their Characterization by Resonant Magnetometry Methods." Engineering, Technology & Applied Science Research 14, no. 6 (2024): 18805–9. https://doi.org/10.48084/etasr.8192.

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In this paper, a simple and effective low-temperature electroless chemical method that provides the synthesis of cobalt micro- and nanowires due to the processes of self-organization of magnetic cobalt nanoparticles under the influence of a magnetic field, using the technology of chemical synthesis of magnetic nanoparticles and nanowires is proposed. Cobalt nanoparticles have magnetic dipole moments. An external magnetic field forces them to be oriented parallel to it. Dipole-dipole interactions between magnetic nanoparticles lead to attraction between cobalt nanoparticles leading to their sel

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Mammadyarova, S. J. "SYNTHESIS AND CHARACTERIZATION OF COBALT OXIDE NANOSTRUCTURES. A BRIEF REVIEW." Azerbaijan Chemical Journal, no. 2 (June 29, 2021): 80–93. http://dx.doi.org/10.32737/0005-2531-2021-2-80-93.

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The newest achievement in the synthesis of cobalt oxide nanoparticles are considered. Cobalt oxide nanoparticles have attracted a great attention due to their uncommon properties and application in a supercapacitor, optoelectronic device, Li-ion battery gas sensor and electrochromic devices. Recently, nanostructured transition metal oxides with valuable properties have become a new class of materials for many technological fields. Cobalt oxide nanoparticles obtained from various precursors show different size distribution as well as different optical, electrical, magnetic, and electrochemical

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Wadhave, Mr. Vijaypal B., Mr. Anand B. Wadhave, and Mr. Chetan A. Bawane. "Synthesis of Cobalt Ferrite Nanoparticles: Characterization and Magnetic Properties." International Journal of Advance and Applied Research 5, no. 23 (2024): 242–44. https://doi.org/10.5281/zenodo.13622384.

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Abstract:  In this study, Cobalt ferrite nanoparticles (CoFe2O4) were synthesized via  hydrothermal technique at 180˚C for 6h using pomegranate fruit peels extract have been investigated. The structural properties of the produced cobalt ferrite nanoparticles were investigated using X-ray diffraction (XRD). The average grain size (D) measured using Scherrer equation is 25.35nm. Fourier Transform Infrared spectroscopy confirmed the formation of cobalt ferrite nanoparticles particles. Magnetic hysteresis was measured using a vibrating sample magnetometer in a maximum field of 15 kO

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Anwar, Ayaz, Leong Chi Fung, Areeba Anwar, et al. "Effects of Shape and Size of Cobalt Phosphate Nanoparticles against Acanthamoeba castellanii." Pathogens 8, no. 4 (2019): 260. http://dx.doi.org/10.3390/pathogens8040260.

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T4 genotype Acanthamoeba are opportunistic pathogens that cause two types of infections, including vision-threatening Acanthamoeba keratitis (AK) and a fatal brain infection known as granulomatous amoebic encephalitis (GAE). Due to the existence of ineffective treatments against Acanthamoeba, it has become a potential threat to all contact lens users and immunocompromised patients. Metal nanoparticles have been proven to have various antimicrobial properties against bacteria, fungi, and parasites. Previously, different types of cobalt nanoparticles showed some promise as anti-acanthamoebic age

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Matsuura, Daisuke, and Tokushi Kizuka. "Structures of Graphene/Cobalt Interfaces in Cobalt-Encapsulated Carbon Nanocapsules." Journal of Nanomaterials 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/843516.

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Carbon nanocapsules (CNCs) encapsulating cobalt (Co) nanoparticles with a face-centered-cubic structure were synthesized by a gas-evaporation method and were observed by high-resolution transmission electron microscopy. The Co nanoparticles revealed polyhedral shapes; they were truncated by low-index facets. The surfaces of Co nanoparticles were surrounded by graphene layers. The atomic configuration and interlayer spacing at the graphene/cobalt interfaces were investigated.

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Dzidziguri, Ella L., Elena N. Sidorova, Marzhan Inkar, et al. "Cobalt nanoparticles synthesis by cobalt nitrate reduction." Materials Research Express 6, no. 10 (2019): 105081. http://dx.doi.org/10.1088/2053-1591/ab3ca8.

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Çiçek, Aydan, Florian Knabl, Maximilian Schiester, et al. "Reliable Atom Probe Tomography of Cu Nanoparticles Through Tailored Encapsulation by an Electrodeposited Film." Nanomaterials 15, no. 1 (2024): 43. https://doi.org/10.3390/nano15010043.

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Nanoparticles are essential for energy storage, catalysis, and medical applications, emphasizing their accurate chemical characterization. However, atom probe tomography (APT) of nanoparticles sandwiched at the interface between an encapsulating film and a substrate poses difficulties. Poor adhesion at the film-substrate interface can cause specimen fracture during APT, while impurities may introduce additional peaks in the mass spectra. We demonstrate preparing APT specimens with strong adhesion between nanoparticles and film/substrate matrices for successful analysis. Copper nanoparticles we

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Stolyar, S. V., O. A. Li, E. D. Nikolaeva, et al. "An Effective Method of Magnetic Hyperthermia Based on the Ferromagnetic Resonance Phenomenon." Физика металлов и металловедение 124, no. 2 (2023): 182–89. http://dx.doi.org/10.31857/s0015323022601490.

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Nickel and cobalt ferrite nanoparticles have been synthesized using the chemical precipitation method; the nanoparticle sizes were found to be 63 ± 22 and 26 ± 4 nm, respectively. The static hysteresis loops and Mössbauer spectra have been measured. It is shown that cobalt ferrite powders are magnetically harder than nickel ferrite powders. Ferromagnetic resonance (FMR) curves have been studied. It is found that the FMR absorption for cobalt ferrite is observed at room temperature and above. The time dependences of the nanoparticle warm-up under FMR conditions have been measured. The maximum t

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Yahya, Noorhana, Muhammad Kashif, Nadeem Nasir, Majid Niaz Akhtar, and Noorasikin Mohd Yusof. "Cobalt Ferrite Nanoparticles: An Innovative Approach for Enhanced Oil Recovery Application." Journal of Nano Research 17 (February 2012): 115–26. http://dx.doi.org/10.4028/www.scientific.net/jnanor.17.115.

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This Paper Describes the Synthesis of Cobalt Ferrite (CoFe2O4) Nanoparticles and their Application in Enhanced Oil Recovery. Cobalt Ferrite (CoFe2O4) Nanoparticles Were Used as Ferrite Magnetic Feeders with Antenna to Improve the Magnetic Field Strength and Cobalt Ferrite Nanofluid to Improve Oil Recovery. Cobalt Ferrite (CoFe2O4) Nanoparticles Were Synthesized by Sol-Gel Method. these Nanoparticles Were then Characterized by Using X-Ray Diffractometer (XRD) and Field Emission Scanning Electron Microscope (FESEM). Cobalt Ferrite Nanoparticles Annealed at 600oC, the Particle Size Is 51.17nm and

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Salman, S. A., T. Usami, K. Kuroda, and M. Okido. "Synthesis and Characterization of Cobalt Nanoparticles Using Hydrazine and Citric Acid." Journal of Nanotechnology 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/525193.

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Cobalt nanoparticles were produced by employing the liquid-phase reduction method and hydrazine. The effect of citric acid additives on the formation and growth mechanism of cobalt nanoparticles was investigated using polarization methods. The cobalt nanoparticles produced in 0.2 M cobalt sulfate and 5 M hydrazine at 298 K had a spherical shape with a diameter of 400 nm. The dendritic nanoparticles formed with the decreasing of hydrazine concentration at 298 K. On the other hand, dendritic large particles are confirmed at 353 K. It was confirmed that the reduction reaction progressed with the

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Sargentelli, Vagner, and Antonio P. Ferreira. "MAGNETIC NANOPARTICLES: THE COBALT." Eclética Química Journal 35, no. 4 (2018): 153. http://dx.doi.org/10.26850/1678-4618eqj.v35.4.2010.p153-163.

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The development of nanoparticles has been intensively pursued because of their technological importance. The magnetic nanoparticulate materials exhibit a series of interesting properties between which are mentioned the electrical, optical, magnetic and chemical properties. Magnetic nanostructures can be used in microelectronic and in medicine as in: magnetic memory storage, magnetic transport of biochemical complexes, magnetic resonance imaging, among others. The magnetic properties of nanoparticles there are very sensitive to its size and form. In this direction, many efforts they have been c

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Glaspell, Garry, Victor Abdelsayed, Khaled M. Saoud, and M. Samy El-Shall. "Vapor-phase synthesis of metallic and intermetallic nanoparticles and nanowires: Magnetic and catalytic properties." Pure and Applied Chemistry 78, no. 9 (2006): 1667–89. http://dx.doi.org/10.1351/pac200678091667.

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In this paper, we present several examples of the vapor-phase synthesis of intermetallic and alloy nanoparticles and nanowires, and investigate their magnetic and catalytic properties. In the first example, we report the vapor-phase synthesis of intermetallic aluminide nanoparticles. Specifically, FeAl and NiAl nanoparticles were synthesized via laser vaporization controlled condensation (LVCC) from their bulk powders. The NiAl nanoparticles were found to be paramagnetic at room temperature, with a blocking temperature of approximately 15 K. The FeAl nanoparticles displayed room-temperature fe

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Bayev, V., J. Fedotova, U. Humennik, et al. "Modification of Electric Transport Properties of CVD Graphene by Electrochemical Deposition of Cobalt Nanoparticles." International Journal of Nanoscience 18, no. 03n04 (2019): 1940041. http://dx.doi.org/10.1142/s0219581x19400416.

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Electrochemical deposition of cobalt nanoparticles was used to modify carrier transport properties of single-layered CVD graphene at the SiO2-on-Si substrate. The structure of graphene with cobalt nanoparticles was analyzed by Raman spectroscopy and scanning electron microscopy. The effect of the deposited cobalt nanoparticles on the sheet resistance of graphene was studied in the temperature range of 4–300[Formula: see text]K.

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Sanpo, Noppakun, James Wang, and Christopher C. Berndt. "Sol-Gel Synthesized Copper-Substituted Cobalt Ferrite Nanoparticles for Biomedical Applications." Journal of Nano Research 22 (May 2013): 95–106. http://dx.doi.org/10.4028/www.scientific.net/jnanor.22.95.

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Copper-substituted cobalt ferrite nanoparticles were prepared via a sol-gel route using citric acid as a chelating agent. The influence of copper concentration on the microstructure, crystal structure and antibacterial property of copper-substituted cobalt ferrite nanoparticles against E. coli and S. aureus has been systematically investigated. The results indicate that the substitution of copper influences strongly the microstructure, crystal structure, particle diameter and antibacterial property of cobalt ferrite nanoparticles.

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Sanpo, Noppakun, James Wang, and Christopher C. Berndt. "Sol-Gel Synthesized Copper-Substituted Cobalt Ferrite Nanoparticles for Biomedical Applications." Journal of Nano Research 25 (October 2013): 110–21. http://dx.doi.org/10.4028/www.scientific.net/jnanor.25.110.

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Copper-substituted cobalt ferrite nanoparticles were prepared via a sol-gel route using citric acid as a chelating agent. The influence of copper concentration on the microstructure, crystal structure and antibacterial property of copper-substituted cobalt ferrite nanoparticles against E. coli and S. aureus has been systematically investigated. The results indicate that the substitution of copper influences strongly the microstructure, crystal structure, particle diameter and antibacterial property of cobalt ferrite nanoparticles.

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Odero, Jacob, Melvine Lilechi, and Samuel Nyanchoga. "Synthesis and Characterization of Cobalt-Doped Zno Nanoparticles with Enhanced Photocatalytic Activity." Journal of Educational Research and Policies 6, no. 8 (2024): 46–49. http://dx.doi.org/10.53469/jerp.2024.06(08).10.

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XRD, TEM and SEM studies were used to evaluate sol - gel - synthesized cobalt - doped zinc oxide (ZnO) nanoparticles. The structural analysis showed that cobalt was successfully incorporated into the ZnO lattice, changing XRD signals. Undoped and doped ZnO nanostructures were identified by SEM. Synthesised nanoparticles were examined for optical characteristics, particle size, and form. The enhanced photocatalytic activity of the Co doped ZnO nanoparticles highlights their potential for various environmental applications wastewater treatment, air purification, CO2 conversion. This research con

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Liang, Qing, Fanling Meng, Kexin Song, Dong Wang, and Wei Zhang. "Exploiting Asymmetric Co States in a Co-N-C Catalyst for an Efficient Oxygen Reduction Reaction." Symmetry 14, no. 12 (2022): 2496. http://dx.doi.org/10.3390/sym14122496.

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Co-NC catalysts have attracted extensive concerns derived from their high oxygen reduction reaction (ORR) activity, but the catalytic mechanism of Co species with different forms remains controversial. Herein, we prepare Co-NC catalysts with a cobalt nanoparticle-supported and nitrogen-doped carbon structure using the ZIF-67 precursor, in which the Co states in the catalyst present an asymmetric state of an exposed carbon coating (Asy-Co) and a symmetric state of buried carbon (Sy-Co). The acid etching process removed the exposed asymmetric cobalt nanoparticles on the surface. The specific rol

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Yoro, Mela, Japhet Joshua, Ayuba Isiyaku, Joyous Wilson Kitime Jonah, and Patrick Datheh Bello. "Green Synthesis, Characterization and Antibacterial Activity of Cobalt Nanoparticles from Parkia biglobosa Aqueous Stem Extract." Scholars International Journal of Chemistry and Material Sciences 5, no. 5 (2022): 79–85. http://dx.doi.org/10.36348/sijcms.2022.v05i05.003.

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In this research article, Cobalt nanoparticles were green synthesized, Characterized and applied in antimicrobial study of some selected pathogens. The formation of cobalt nanoparticles was confirmed by first, its colour change from light brown to dark brown within 10 minutes. From the UV-Vis spectral analysis, it was observed that highest absorption peak appeared at 400nm reflecting the surface Plasmon resonance of Cobalt NPs from Parkia biglobosa stem which is characteristic of Cobalt Nanoparticles. From the FT-IR studies, the absorption peaks were seen at 3787.71 cm-1, 3660.31 cm-1, 3436.44

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Amiruddin, Erwin, Amir Awaluddin, Martha Rianna, et al. "Enhanced Magnetic Properties of Iron Oxide Nanoparticles Encapsulated in Cobalt Nanopowder Derived from Sunur-Pariaman Beach Sand." Journal of Physics: Conference Series 2733, no. 1 (2024): 012026. http://dx.doi.org/10.1088/1742-6596/2733/1/012026.

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Abstract Cobalt encapsulated iron oxide nanoparticles based on Sunur-Pariaman beach sand were prepared using ball milling method. Cobalt nanoparticles with concentration of 0, 5,10 and 15 wt.% were added to the iron oxide nanoparticles. Un-encapsulated iron oxide nanoparticles revealed as pure cubic structure of magnetite phase well matched to JCPDS No. 03-0863 with crystallite size in the range of 30.86 -34.91 nm confirmed by X-Ray diffractometer (XRD). Saturation, remanance magnetization and coercivity increase with an increase of cobalt concentration for Co-encapsulated iron oxide nanopartc

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Rutirawut, Teerapat, Wanwisa Limphirat, Asawin Sinsarp, Kritsanu Tivakornsasithorn, Toemsak Srikhirin, and Tanakorn Osotchan. "Composition and Oxidation State of Cobalt and Nickel-Iron Oxide Colloidal Nanoparticles in Liquid Phase." Advanced Materials Research 1103 (May 2015): 21–27. http://dx.doi.org/10.4028/www.scientific.net/amr.1103.21.

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The magnetic nanoparticles of cobalt-and nickel-iron oxide have been extensive interest due to their superparamagnetic properties and their potential applications in many fields. The iron, cobalt and nickel can stay in many oxidation states and are easily oxidized especially in ambient air therefore the composition and oxidation states of these oxides can be unintentionally modified. Usually, the composition and oxidation states in these magnetic nanoparticles are determined by various experimental techniques required a sample in solid phase. This may lead the nanoparticles to directly contact

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