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Journal articles on the topic 'Nanostructured CoFe2O4-Magnetic'

Author: Grafiati

Published: 6 September 2023

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1

Makido, Olena, Galyna Khovanets’, Viktoria Kochubei, and Iryna Yevchuk. "Nanostructured Magnetically Sensitive Catalysts for the Fenton System: Obtaining, Research, Application." Chemistry & Chemical Technology 16, no. 2 (June 15, 2022): 227–36. http://dx.doi.org/10.23939/chcht16.02.227.

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Nanostructured “shell-shell” type catalysts, which consist of a magnetically sensitive core of cobalt ferrite and a protective layer of porous SiO2, have been synthesized. On the surface of porous SiO2 clusters of copper oxide are situated playing the role of catalytic centers. The structure of CoFe2O4 / SiO2 / CuO catalyst was confirmed by thermogravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Studies of the catalytic activity of the obtained catalysts were performed in the Fenton system on a model solution of methylene blue (MB). The catalytic activity of the composite in MB destruction reaches 99%. The high magnetic sensitivity of the obtained catalysts ensures their easy removal from the reaction medium. The catalysts demonstrated the possibility of reusability without loss of activity.

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Bigham, Ashkan, Amir Hamed Aghajanian, Shima Behzadzadeh, Zahra Sokhani, Sara Shojaei, Yeganeh Kaviani, and S. A. Hassanzadeh-Tabrizi. "Nanostructured magnetic Mg2SiO4-CoFe2O4 composite scaffold with multiple capabilities for bone tissue regeneration." Materials Science and Engineering: C 99 (June 2019): 83–95. http://dx.doi.org/10.1016/j.msec.2019.01.096.

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3

Xu, Yanhong, Hui Zhang, Xue Duan, and Yaping Ding. "Preparation and investigation on a novel nanostructured magnetic base catalyst MgAl–OH-LDH/CoFe2O4." Materials Chemistry and Physics 114, no. 2-3 (April 2009): 795–801. http://dx.doi.org/10.1016/j.matchemphys.2008.10.045.

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4

Redón, Rocío, Miriam D. Aviles-Avila, Leopoldo Ruiz-Huerta, Herlinda Montiel, Alex Elías-Zúñiga, Lucy-Caterine Daza-Gómez, and Oscar Martínez-Romero. "Inducing Magnetic Properties with Ferrite Nanoparticles in Resins for Additive Manufacturing." International Journal of Molecular Sciences 24, no. 14 (July 24, 2023): 11838. http://dx.doi.org/10.3390/ijms241411838.

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Additive manufacturing and nanotechnology have been used as fundamental tools for the production of nanostructured parts with magnetic properties, expanding the range of applications in additive processes through tank photopolymerization. Magnetic cobalt ferrite (CoFe2O4) and barium ferrite (BaFe12O19) nanoparticles (NPs) with an average size distribution value (DTEM) of 12 ± 2.95 nm and 37 ± 12.78 nm, respectively, were generated by the hydroxide precipitation method. The dispersion of the NPs in commercial resins (Anycubic Green and IRIX White resin) was achieved through mechanochemical reactions carried out in an agate mortar for 20 min at room temperature, with limited exposure to light. The resulting product of each reaction was placed in amber vials and stored in a box to avoid light exposure. The photopolymerization process was carried out only at low concentrations (% w/w NPs/resin) since high concentrations did not result in the formation of pieces, due to the high refractive index of ferrites. The Raman spectroscopy of the final pieces showed the presence of magnetic NPs without any apparent chemical changes. The electron paramagnetic resonance (EPR) results of the pieces demonstrated that their magnetic properties were maintained and not altered during the photopolymerization. Although significant differences were observed in the dispersion process of the NPs in each piece, we determined that the photopolymerization did not affect the structure and superparamagnetic behavior of ferrite NPs during processing, successfully transferring the magnetic properties to the final 3D-printed piece.

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Galizia, Pietro, Carlo Baldisserri, Elisa Mercadelli, Claudio Capiani, Carmen Galassi, and Miguel Algueró. "A Glance at Processing-Microstructure-Property Relationships for Magnetoelectric Particulate PZT-CFO Composites." Materials 13, no. 11 (June 6, 2020): 2592. http://dx.doi.org/10.3390/ma13112592.

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In this work, we investigated the processing-microstructure-property relationships for magnetoelectric (ME) particulate composites consisting of hard ferromagnetic CoFe2O4 (CFO) particles dispersed in a Nb-doped PbZrxTi1-xO3 (PZT) soft ferroelectric matrix. Several preparation steps, namely PZT powder calcination, PZT-CFO mixture milling and composite sintering were tailored and a range of microstructures was obtained. These included open and closed porosities up to full densification, PZT matrices with decreasing grain size across the submicron range down to the nanoscale and well dispersed CFO particles with bimodal size distributions consisting of submicron and micron sized components with varying weights. All samples could be poled under a fixed DC electric field of 4 kV/mm and the dielectric, piezoelectric and elastic coefficients were obtained and are discussed in relation to the microstructure. Remarkably, materials with nanostructured PZT matrices and open porosity showed piezoelectric charge coefficients comparable with fully dense composites with coarsened microstructure and larger voltage coefficients. Besides, the piezoelectric response of dense materials increased with the size of the CFO particles. This suggests a role of the conductive magnetic inclusions in promoting poling. Magnetoelectric coefficients were obtained and are discussed in relation to densification, piezoelectric matrix microstructure and particle size of the magnetic component. The largest magnetoelectric coefficient α33 of 1.37 mV cm−1 Oe−1 was obtained for submicron sized CFO particles, when closed porosity was reached, even if PZT grain size remained in the nanoscale.

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6

Freire, Rafael M., Evelyn Silva-Moreno, Christian Robles-Kelly, Claudia D. Infante, Juliano C. Denardin, and Sebastian Michea. "Straightforward synthesis of monodisperse Co/Zn-based nanoparticles and their antifungal activities on Botrytis cinerea." AIP Advances 13, no. 3 (March 1, 2023): 035001. http://dx.doi.org/10.1063/9.0000534.

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Herein, we have displayed an easy way to produce monodisperse spinel nanoparticles (NPs) and the antifungal activity of CoFe2O4, Co0.5Zn0.5Fe2O4 and ZnFe2O4 nanostructures. Firstly, the structural, morphological and magnetic properties of each NP were investigated through x-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and Vibrating Sample Magnetometer (VSM). The XRD data showed diffraction peaks related to the crystalline spinel phase. The TEM micrographs displayed monodisperse NPs with spherical morphology. The average sizes of CoFe2O4, Co0.5Zn0.5Fe2O4 and ZnFe2O4 NPs were 6.87 ± 0.05 nm, 5.18 ± 0.01 nm and 11.52 ± 0.09 nm, respectively. The VSM data indicated that the nanostructures are superparamagnetic at room temperature. Afterward, the antifungal properties of the Co/Zn-based ferrite NPs against Botrytis cinerea were tested. So, the inhibition of mycelial growth by different concentrations (45 – 360 ppm) of NPs was measured. The most effective nanostructure was CoFe2O4, with an EC50 value of 265 ppm. Further, to elucidate how the NPs are affecting B. cinerea, reactive oxygen species (ROS) production was measured. The results indicated that the CoFe2O4 monodisperse NPs could induce a burst of ROS in B. cinerea, promoting cellular damage.

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7

Dinh, Quang Thanh, Van Tuan Dinh, Hoai Nam Nguyen, Tien Anh Nguyen, Xuan Truong Nguyen, Luong Lam Nguyen, Thi Mai Thanh Dinh, Hong Nam Pham, and Van Quynh Nguyen. "Synthesis of magneto-plasmonic hybrid material for cancer hyperthermia." Journal of Military Science and Technology, no. 81 (August 26, 2022): 128–37. http://dx.doi.org/10.54939/1859-1043.j.mst.81.2022.128-137.

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Magnetic nanoparticle CoFe2O4-based hyperthermia is a promising non-invasive approach for cancer therapy. However, CoFe2O4 nanoparticles (NPs) have a low heat transfer efficiency, which limits their practical clinical applications. Hence, it is necessary to investigate the higher-performance magnetic NPs-based hybrid nanostructures to enhance their magnetic hyperthermia efficiency. This work presents a facile in situ approach for synthesizing cobalt ferrite (CoFe2O4) silver (Ag) hybrid NPs as optical-magnetic hyperthermia heat mediators. The prepared cobalt ferrite silver hybrid NPs exhibit a higher heat generation than that of individual Ag or CoFe2O4 NPs under simultaneous exposure to an alternating current magnetic field and laser source. The obtained results confirm that the hybridization of CoFe2O4 and Ag NPs could significantly enhance the hyperthermia efficiency of the prepared NPs. Therefore, the CoFe2O4-Ag hybrid NPs are considered as potential candidates for a high-performance hyperthermia mediator based on a simple and effective synthesis approach.

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JIN, HONGXIAO, LIANG LI, MIN CHEN, JINGCAI XU, BO HONG, BAO HUANG, DINGFENG JIN, HONGLIANG GE, and XINQING WANG. "SYNTHESIS OF MAGNETIC SBA-15 AND Fe–SBA-15 MESOPOROUS NANOCOMPOSITES WITH COBALT FERRITES." Nano 06, no. 03 (June 2011): 287–93. http://dx.doi.org/10.1142/s1793292011002512.

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A new nanocomposite based on SBA-15 mesoporous materials combined with Fe2O3 and CoFe2O4 nanoparticles was prepared via sol–gel growth. The nanostructures and magnetic properties of the SBA-15 nanocomposite were investigated by X-ray diffraction topography, high resolution transmission electron microscopy, and vibrating sample magnetometer. Results indicate that α- Fe2O3 nanoparticles are present in the frame or micropores of SBA-15 (denoted as Fe –SBA-15 below) and that CoFe2O4 nanoparticles are confined in the mesoporous channels of Fe –SBA-15. Our results also reveal that the addition of CoFe2O4 and α- Fe2O3 magnetic nanoparticles critically affects their magnetic properties. The saturation magnetization of the SBA-15 nanocomposite is attributed to ferrimagnetic CoFe2O4 nanoparticles and antiferromagnetic α- Fe2O3 nanoparticles, whereas the coercivity increases with the content of CoFe2O4 . Moreover, the presence of the couple exchange interaction between the magnetic nanoparticles is confirmed, which can enhance the magnetic properties of the SBA-15 nanocomposite.

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9

Kumar, Shalendra, Faheem Ahmed, Nagih M. Shaalan, Rajesh Kumar, Adil Alshoaibi, Nishat Arshi, Saurabh Dalela, Fatima Sayeed, Sourabh Dwivedi, and Kavita Kumari. "Structural, Magnetic, and Electrical Properties of CoFe2O4 Nanostructures Synthesized Using Microwave-Assisted Hydrothermal Method." Materials 15, no. 22 (November 10, 2022): 7955. http://dx.doi.org/10.3390/ma15227955.

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Magnetic nanostructures of CoFe2O4 were synthesized via a microwave-assisted hydrothermal route. The prepared nanostructures were investigated using X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), energy dispersive X-ray (EDX) spectroscopy, high-resolution transmission electron microscopy (HR-TEM), selective area electron diffraction (SAED) pattern, DC magnetization, and dielectric spectroscopy measurements. The crystal structure studied using HR-TEM, SAED, and XRD patterns revealed that the synthesized nanostructures had a single-phase nature and ruled out the possibility of any secondary phase. The lattice parameters and unit cell volume determined from the XRD data were found to be 8.4821 Å and 583.88 Å3. The average crystallite size (~7.0 nm) was determined using Scherrer’s equation. The FE-SEM and TEM micrographs revealed that the prepared nanostructures had a spherical shape morphology. The EDX results showed that the major elements present in the samples were Co, Fe, and O. The magnetization (M) versus temperature (T) measurements specified that the CoFe2O4 nanostructures showed ferromagnetic ordering at room temperature. The blocking temperature (TB) determined using the M-T curve was found to be 315 K. The magnetic hysteresis (M-H) loop of the CoFe2O4 nanostructures recorded at different temperatures showed the ferromagnetic behavior of the CoFe2O4 nanostructures at temperatures of 200 K and 300 K, and a superparamagnetic behavior at 350 K. The dielectric spectroscopy studies revealed a dielectric constant (ε′) and loss tangent (tanδ) decrease with the increase in the frequency, as well as demonstrating a normal dispersion behavior, which is due to the Maxwell–Wagner type of interfacial polarization. The values of ε′ and tanδ were observed to increase with the increase in the temperature.

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10

Wang, Ji-Ning, Wei-Li Li, Xiao-Liang Li, and W. D. Fei. "In situ X-ray diffraction analysis of Pb(Zr0.52Ti0.48)O3 phase transition in CoFe2O4/Pb(Zr0.52Ti0.48)O3 2-2-type bilayer films." Powder Diffraction 25, S1 (September 2010): S45—S47. http://dx.doi.org/10.1154/1.3478981.

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A 2-2-type nanostructure bilayer film of CoFe2O4/Pb(Zr0.52Ti0.48)O3 was successfully prepared on the (111)Pt/Ti/SiO2/Si substrate. The Pb(Zr0.52Ti0.48)O3 layer in the bilayer film is (111) oriented and is a mixture of tetragonal and monoclinic phases. The results from an in situ X-ray diffraction analysis of the multiferroic bilayer film under statistic magnetic field indicate that the monoclinic-tetragonal phase transition was induced by magnetostriction of the CoFe2O4 layer. A large magnetoelectric effect was obtained probably because of the different polarization directions of the tetragonal and monoclinic phases.

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11

Selianitis, Dimitrios, Aleksander Forys, Barbara Trzebicka, Adam Alemayehu, Václav Tyrpekl, and Stergios Pispas. "Amphiphilic P(OEGMA-co-DIPAEMA) Hyperbranched Copolymer/Magnetic Nanoparticle Hybrid Nanostructures by Co-Assembly." Nanomanufacturing 2, no. 1 (March 1, 2022): 53–68. http://dx.doi.org/10.3390/nanomanufacturing2010004.

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This work presents the utilization of amphiphilic poly(oligo(ethylene glycol) methyl methacrylate)-co-poly(2-(diisopropylamino)ethyl methacrylate), P(OEGMA-co-DIPAEMA), hyperbranched (HB) copolymers, forming polymeric aggregates in aqueous media, as building nanocomponents and nanocarriers for the entrapment of magnetic cobalt ferrite nanoparticles (CoFe2O4, MNPs), and the hydrophobic drug curcumin (CUR) in their hydrophobic domains. Dynamic light scattering (DLS) and cryogenic transmission electron microscopy (cryo-TEM) techniques were used to evaluate the multifunctional hybrid nanostructures formed in aqueous media by co-assembly of the components and their solution properties. Magnetic nanoparticles (MNPs) or MNPs/CUR were co-assembled effectively with pre-existing polymer aggregates, leading to well-defined hybrid nanostructures. Magnetophoresis experiments revealed that the hybrid nanostructures retain the magnetic properties of MNPs after their co-assembly with the hyperbranched copolymers. The hybrid nanostructures demonstrate a significant colloidal stability under physiological conditions. Furthermore, MNPs/CUR-loaded aggregates displayed considerable fluorescence as demonstrated by fluorescence spectroscopy. These hybrid nanostructures could be promising candidates for drug delivery and bio-imaging applications.

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12

Deng, Yu, Di Wu, Huiqiang Yu, and Youwei Du. "Enhanced Magnetoelectric Response and Phonon Abnormality of Self-assembled Feather-like CoFe2O4-BaTiO3 Nanostructures." MRS Proceedings 1454 (2012): 57–62. http://dx.doi.org/10.1557/opl.2012.1068.

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ABSTRACTMagnetoelectric (ME) (CoFe2O4)0.3-(BaTiO3)0.7 (CFO-BTO) nanostructures have been synthesized by a combinative using of hydrothermal reaction and polymer-assisted deposition. The feather-like nanostructures have an average diameter of 250nm and lengths up to 5μm, with the single-crystal CFO nanopillars embedded in the BTO matrix. The CFO-BTO nanostructures exhibit good magnetic (Ms=21.0emu/g, Mr=10.4emu/g and Hc=560.7Oe) and ferroelectric properties (Ps=10.5μC/cm2, Pr=5.6μC/cm2), as well as a large ME coefficient of 51.8mV/cmOe. A prominent phonon abnormality has also been detected between 110°C and 140°C. With emphasis on the novel microstructure, the ME response and phonon abnormality of the CFO-BTO nanostructures have been discussed.

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13

Zheng, Haimei, Jens Kreisel, Ying-Hao Chu, R. Ramesh, and Lourdes Salamanca-Riba. "Heteroepitaxially enhanced magnetic anisotropy in BaTiO3–CoFe2O4 nanostructures." Applied Physics Letters 90, no. 11 (March 12, 2007): 113113. http://dx.doi.org/10.1063/1.2713131.

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14

Akbari, Hossein, Seyed Ali Sebt, Hadi Arabi, Hossein Zeynali, and Mohhamad Elahi. "FePt3/CoFe2O4 core/shell nanostructures and their magnetic properties." Chemical Physics Letters 524 (February 2012): 78–83. http://dx.doi.org/10.1016/j.cplett.2011.12.046.

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15

Rostamzadehmansoor, S., Mirabdullah Seyed Sadjadi, K. Zare, and Nazanin Farhadyar. "Preparation of Ferromagnetic Manganese Doped Cobalt Ferrite-Silica Core Shell Nanoparticles for Possible Biological Application." Defect and Diffusion Forum 334-335 (February 2013): 19–25. http://dx.doi.org/10.4028/www.scientific.net/ddf.334-335.19.

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Magnetic oxide nanoparticles with proper surface coatings are increasingly being evaluated for clinical applications such as hyperthermia, drug delivery, magnetic resonance imaging, transfection and cell/protein separations. In this work, we investigated synthesis, magnetic properties of silica coated metal ferrite, (CoFe2O4)/SiO2 and manganese doped cobalt ferrite nanoparticles (Mnx-Co1-xFe2O4 with x = 0.02, 0.04 and 0.06)/SiO2 for possible biomedical application. All the ferrites nanoparticles were prepared by co-precipitation method using FeCl3.6H2O, CoCl2.6H2O and MnCl2.2H2O as precursors, and were silica coated by the Stober process in directly ethanol. The composition, phase structure and morphology of the prepared core/shell cobalt ferrites nanostructures were characterized by powder X-ray diffraction (XRD), Fourier Transform infra-red spectra (FTIR), Field Emission Scanning Electron Microscopy and energy dispersive X-ray analysis (FESEM-EDAX). The results revealed that all the samples maintain the ferrite spinel structure. While, the cell parameters decrease monotonically by increase of Mn content indicating that the Mn ions are substituted into the lattice of CoFe2O4. The magnetic properties of the prepared samples were investigated at room temperature using Vibrating Sample Magnetometer (VSM). The results revealed a strong dependence of room temperature magnetic properties on (1) doping content, x; (2) particle size and ion distributions.

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16

Wang, Zhongli, Xiaojuan Liu, Minfeng Lv, Ping Chai, Yao Liu, Xianfeng Zhou, and Jian Meng. "Preparation of One-Dimensional CoFe2O4 Nanostructures and Their Magnetic Properties." Journal of Physical Chemistry C 112, no. 39 (August 27, 2008): 15171–75. http://dx.doi.org/10.1021/jp802614v.

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17

Kalska Szostko, Beata, Ewa Brancewicz, E. Orzechowska, Piotr Mazalski, and T. Wojciechowski. "Magnetic Nanotubes as an Element in Biocomposites." Materials Science Forum 674 (February 2011): 231–37. http://dx.doi.org/10.4028/www.scientific.net/msf.674.231.

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In this work magnetic nanorods have been synthesized by electrodeposition inside the nanotubes fixed to anodic alumina oxide (AAO). The used templates have the pore diameter of 120 nm. In the first step different combinations of 3d elements oxide nanotubes such as: CoO, NiO, NiFe2O4, CoFe2O4 and Fe3O4, have been successfully fabricated inside the nanopores by wetting chemical deposition followed by thermal decomposition. Oxide/Fe, wires were obtained in the next step by electrodeposition The morphology of obtained structures were studied by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The magnetic properties of the nanostructures were determined on the base of behavior of the structures in external magnetic field. Local magnetic moment orientation is not strictly determined up to now. The potential biological application as an enzyme carrier was tested.

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18

Landa, Romina A., Jose J. Calvino, Miguel López-Haro, and P. Soledad Antonel. "Nanostructure, compositional and magnetic studies of Poly(aniline)–CoFe2O4 nanocomposites." Nano-Structures & Nano-Objects 28 (October 2021): 100808. http://dx.doi.org/10.1016/j.nanoso.2021.100808.

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19

Sangmanee, Montana, and Santi Maensiri. "Nanostructures and magnetic properties of cobalt ferrite (CoFe2O4) fabricated by electrospinning." Applied Physics A 97, no. 1 (May 16, 2009): 167–77. http://dx.doi.org/10.1007/s00339-009-5256-5.

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20

Senthil, V. P., J. Gajendiran, S. Gokul Raj, T. Shanmugavel, G. Ramesh Kumar, and C. Parthasaradhi Reddy. "Study of structural and magnetic properties of cobalt ferrite (CoFe2O4) nanostructures." Chemical Physics Letters 695 (March 2018): 19–23. http://dx.doi.org/10.1016/j.cplett.2018.01.057.

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21

Khan, Usman, Adeela Nairan, Shafaq Naz, Xusheng Wang, Karim Khan, Ayesha Khan Tareen, Dang Wu, and Junkuo Gao. "Optical and temperature-dependent magnetic properties of Mn-doped CoFe2O4 nanostructures." Materials Today Communications 35 (June 2023): 106276. http://dx.doi.org/10.1016/j.mtcomm.2023.106276.

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22

Kohantorabi, Mona, Mojtaba Hosseinifard, and Asghar Kazemzadeh. "Catalytic activity of a magnetic Fe2O3@CoFe2O4 nanocomposite in peroxymonosulfate activation for norfloxacin removal." New Journal of Chemistry 44, no. 10 (2020): 4185–98. http://dx.doi.org/10.1039/c9nj04379a.

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In this study, Fe₂O₃ nanoparticles derived from a metal organic framework (MIL-88B) template were successfully decorated on CoFe₂O₄ flower-like nanostructures through a facile hydrothermal/calcination method.

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23

Wei, Shuhui, and Ali Reza Kamali. "Waste plastic derived Co3Fe7/CoFe2O4@carbon magnetic nanostructures for efficient dye adsorption." Journal of Alloys and Compounds 886 (December 2021): 161201. http://dx.doi.org/10.1016/j.jallcom.2021.161201.

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24

Dix, Nico, Rajaram Muralidharan, Jose-Manuel Rebled, Sonia Estradé, Francesca Peiró, Manuel Varela, Josep Fontcuberta, and Florencio Sánchez. "Selectable Spontaneous Polarization Direction and Magnetic Anisotropy in BiFeO3−CoFe2O4 Epitaxial Nanostructures." ACS Nano 4, no. 8 (July 28, 2010): 4955–61. http://dx.doi.org/10.1021/nn101546r.

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25

Fan, Lisha, Xiang Gao, Thomas O. Farmer, Dongkyu Lee, Er-Jia Guo, Sai Mu, Kai Wang, et al. "Vertically Aligned Single-Crystalline CoFe2O4 Nanobrush Architectures with High Magnetization and Tailored Magnetic Anisotropy." Nanomaterials 10, no. 3 (March 5, 2020): 472. http://dx.doi.org/10.3390/nano10030472.

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Micrometer-tall vertically aligned single-crystalline CoFe2O4 nanobrush architectures with extraordinarily large aspect ratio have been achieved by the precise control of a kinetic and thermodynamic non-equilibrium pulsed laser epitaxy process. Direct observations by scanning transmission electron microscopy reveal that the nanobrush crystal is mostly defect-free by nature, and epitaxially connected to the substrate through a continuous 2D interface layer. In contrast, periodic dislocations and lattice defects such as anti-phase boundaries and twin boundaries are frequently observed in the 2D interface layer, suggesting that interface misfit strain relaxation under a non-equilibrium growth condition plays a critical role in the self-assembly of such artificial architectures. Magnetic property measurements have found that the nanobrushes exhibit a saturation magnetization value of 6.16 μB/f.u., which is much higher than the bulk value. The discovery not only enables insights into an effective route for fabricating unconventional high-quality nanostructures, but also demonstrates a novel magnetic architecture with potential applications in nanomagnetic devices.

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26

Javed, Fatima, Muhammad Asad Abbas, Muhammad Imran Asad, Naveed Ahmed, Nauman Naseer, Hassan Saleem, Abdelhamid Errachid, Noureddine Lebaz, Abdelhamid Elaissari, and Nasir M. Ahmad. "Gd3+ Doped CoFe2O4 Nanoparticles for Targeted Drug Delivery and Magnetic Resonance Imaging." Magnetochemistry 7, no. 4 (March 30, 2021): 47. http://dx.doi.org/10.3390/magnetochemistry7040047.

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Nanoparticles of CoGdxFe2 − xO4 (x = 0%, 25%, 50%) synthesized via sol–gel auto combustion technique and encapsulated within a polymer (Eudragit E100) shell containing curcumin by single emulsion solvent evaporation technique were formulated in this study. Testing of synthesized nanoparticles was carried out by using different characterization techniques, to investigate composition, crystallinity, size, morphology, surface charge, functional groups and magnetic properties of the samples. The increased hydrophilicity resulted in sustained drug release of 90.6% and 95% for E1(CoGd0.25Fe1.75O4) and E2(CoGd0.50Fe1.5O4), respectively, over a time span of 24 h. The relaxivities of the best-chosen samples were measured by using a 3T magnetic resonance imaging (MRI) machine, and a high r2/r1 ratio of 43.64 and 23.34 for composition E1(CoGd0.25Fe1.75O4) and E2(CoGd0.50Fe1.5O4) suggests their ability to work as a better T2 contrast agent. Thus, these novel synthesized nanostructures cannot only enable MRI diagnosis but also targeted drug delivery.

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Tsai, C. Y., H. R. Chen, F. C. Chang, W. C. Tsai, H. M. Cheng, Y. H. Chu, C. H. Lai, and W. F. Hsieh. "Stress-mediated magnetic anisotropy and magnetoelastic coupling in epitaxial multiferroic PbTiO3-CoFe2O4 nanostructures." Applied Physics Letters 102, no. 13 (April 2013): 132905. http://dx.doi.org/10.1063/1.4800069.

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28

Li, Mingyang, Yanchao Mao, Hao Yang, Wei Li, Chengsheng Wang, Peng Liu, and Yexiang Tong. "Controllable electrochemical synthesis of CoFe2O4 nanostructures on FTO substrate and their magnetic properties." New Journal of Chemistry 37, no. 10 (2013): 3116. http://dx.doi.org/10.1039/c3nj00479a.

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29

Pinheiro, A. V. B., R. B. da Silva, M. A. Morales, E. D. Silva Filho, and J. M. Soares. "Exchange bias and superspin glass behavior in nanostructured CoFe2O4-Ag composites." Journal of Magnetism and Magnetic Materials 497 (March 2020): 165940. http://dx.doi.org/10.1016/j.jmmm.2019.165940.

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30

Maltoni, Pierfrancesco, Tapati Sarkar, Gianni Barucca, Gaspare Varvaro, Federico Locardi, Davide Peddis, and Roland Mathieu. "Tuning the Magnetic Properties of Hard–Soft SrFe12O19/CoFe2O4 Nanostructures via Composition/Interphase Coupling." Journal of Physical Chemistry C 125, no. 10 (March 5, 2021): 5927–36. http://dx.doi.org/10.1021/acs.jpcc.1c00355.

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31

Duru, I. P. "Electronic and magnetic properties of CoFe2O4 nanostructures: An ab-initio and Monte Carlo study." Physica B: Condensed Matter 627 (February 2022): 413548. http://dx.doi.org/10.1016/j.physb.2021.413548.

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32

Tsai, C. Y., H. R. Chen, F. C. Chang, H. H. Kuo, H. M. Cheng, W. C. Tsai, Y. H. Chu, C. H. Lai, and W. F. Hsieh. "Anisotropic strain, magnetic properties, and lattice dynamics in self-assembled multiferroic CoFe2O4-PbTiO3 nanostructures." Journal of Applied Physics 115, no. 13 (April 7, 2014): 134317. http://dx.doi.org/10.1063/1.4870803.

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Bertuit, Enzo, Sophie Neveu, and Ali Abou-Hassan. "High Temperature Continuous Flow Syntheses of Iron Oxide Nanoflowers Using the Polyol Route in a Multi-Parametric Millifluidic Device." Nanomaterials 12, no. 1 (December 30, 2021): 119. http://dx.doi.org/10.3390/nano12010119.

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One of the most versatile routes for the elaboration of nanomaterials in materials science, including the synthesis of magnetic iron oxide nanoclusters, is the high-temperature polyol process. However, despite its versatility, this process still lacks reproducibility and scale-up, in addition to the low yield obtained in final materials. In this work, we demonstrate a home-made multiparametric continuous flow millifluidic system that can operate at high temperatures (up to 400 °C). After optimization, we validate its potential for the production of nanomaterials using the polyol route at 220 °C by elaborating ferrite iron oxide nanoclusters called nanoflowers (CoFe2O4, Fe3O4, MnFe2O4) with well-controlled nanostructure and composition, which are highly demanded due to their physical properties. Moreover, we demonstrate that by using such a continuous process, the chemical yield and reproducibility of the nanoflower synthesis are strongly improved as well as the possibility to produce these nanomaterials on a large scale with quantities up to 45 g per day.

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Aguesse, Frederic, Anna-Karin Axelsson, Matjaz Valant, and Neil McN Alford. "Enhanced magnetic performance of CoFe2O4/BaTiO3 multilayer nanostructures with a SrTiO3 ultra-thin barrier layer." Scripta Materialia 67, no. 3 (August 2012): 249–52. http://dx.doi.org/10.1016/j.scriptamat.2012.04.030.

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Chandekar, Kamlesh V., Mohd Shkir, and S. AlFaify. "A structural, elastic, mechanical, spectroscopic, thermodynamic, and magnetic properties of polymer coated CoFe2O4 nanostructures for various applications." Journal of Molecular Structure 1205 (April 2020): 127681. http://dx.doi.org/10.1016/j.molstruc.2020.127681.

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Verma, Kuldeep Chand. "Core/Shell Nanostructures Due To Ce Into CoFe2O4 Induce Lattice And Vibrational Defects For Magnetic And Dielectric Enhancement." Advanced Materials Letters 7, no. 8 (August 1, 2016): 622–29. http://dx.doi.org/10.5185/amlett.2016.6278.

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37

Krajewski, Marcin, Mateusz Tokarczyk, Sabina Lewińska, Katarzyna Brzózka, Kamil Bochenek, and Anna Ślawska-Waniewska. "Evolution of Structural and Magnetic Properties of Fe-Co Wire-like Nanochains Caused by Annealing Atmosphere." Materials 14, no. 16 (August 23, 2021): 4748. http://dx.doi.org/10.3390/ma14164748.

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Thermal treatment is a post-synthesis treatment that aims to improve the crystallinity and interrelated physical properties of as-prepared materials. This process may also cause some unwanted changes in materials like their oxidation or contamination. In this work, we present the post-synthesis annealing treatments of the amorphous Fe1−xCox (x = 0.25; 0.50; 0.75) Wire-like nanochains performed at 400 °C in two different atmospheres, i.e., a mixture of 80% nitrogen and 20% hydrogen and argon. These processes caused significantly different changes of structural and magnetic properties of the initially-formed Fe-Co nanostructures. All of them crystallized and their cores were composed of body-centered cubic Fe-Co phase, whereas their oxide shells comprised of a mixture of CoFe2O4 and Fe3O4 phases. However, the annealing carried out in hydrogen-containing atmosphere caused a decomposition of the initial oxide shell layer, whereas a similar process in argon led to its slight thickening. Moreover, it was found that the cores of thermally-treated Fe0.25Co0.75 nanochains contained the hexagonal closest packed (hcp) Co phase and were covered by the nanosheet-like shell layer in the case of annealing performed in argon. Considering the evolution of magnetic properties induced by structural changes, it was observed that the coercivities of annealed Fe-Co nanochains increased in comparison with their non-annealed counterparts. The saturation magnetization (MS) of the Fe0.25Co0.75 nanomaterial annealed in both atmospheres was higher than that for the non-annealed sample. In turn, the MS of the Fe0.75Co0.25 and Fe0.50Co0.50 nanochains annealed in argon were lower than those recorded for non-annealed samples due to their partial oxidation during thermal processing.

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Manikandan, A., R. Sridhar, S. Arul Antony, and Seeram Ramakrishna. "A simple aloe vera plant-extracted microwave and conventional combustion synthesis: Morphological, optical, magnetic and catalytic properties of CoFe2O4 nanostructures." Journal of Molecular Structure 1076 (November 2014): 188–200. http://dx.doi.org/10.1016/j.molstruc.2014.07.054.

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Amiri, Mahnaz, Ahmad Akbari, Meysam Ahmadi, Abbas Pardakhti, and Masoud Salavati-Niasari. "Synthesis and in vitro evaluation of a novel magnetic drug delivery system; proecological method for the preparation of CoFe2O4 nanostructures." Journal of Molecular Liquids 249 (January 2018): 1151–60. http://dx.doi.org/10.1016/j.molliq.2017.11.133.

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Maleki, Ali, Morteza Aghaei, Hamid Reza Hafizi-Atabak, and Mohammad Ferdowsi. "Ultrasonic treatment of CoFe2O4@B2O3-SiO2 as a new hybrid magnetic composite nanostructure and catalytic application in the synthesis of dihydroquinazolinones." Ultrasonics Sonochemistry 37 (July 2017): 260–66. http://dx.doi.org/10.1016/j.ultsonch.2017.01.022.

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Nuñez, Jorge M., Simon Hettler, Enio Lima, Gerardo F. Goya, Raul Arenal, Roberto Zysler, Myriam Haydee Aguirre, and Elin Winkler. "Onion-like Fe3O4/MgO/CoFe2O4 magnetic nanoparticles: new ways to control magnetic coupling between soft/hard magnetic phases." Journal of Materials Chemistry C, 2022. http://dx.doi.org/10.1039/d2tc03144b.

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The control of the magnetization inversion dynamics is one of the main challenges driving the design of new nanostructured magnetic materials for magnetoelectronic applications. Nanoparticles with onion-like architecture offer a...

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42

Kant, K. Mohan, and M. S. Ramachandra Rao. "Structural and Morphological Characterization of Nanostructured Cobalt Ferrite Thin Films by Pulsed Laser Deposition." MRS Proceedings 962 (2006). http://dx.doi.org/10.1557/proc-0962-p09-08.

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ABSTRACTCobalt ferrite (CoFe2O4) thin films were deposited on quartz and single crystalline MgO(001) substrates using pulsed laser deposition (PLD) technique. The orientation of the as-deposited films were investigated as a function of substrate temperature (TS) in the range 200°C – 750°C. Films grown on MgO at higher substrate temperature were found to be (001) oriented while the films grown at lower substrate temperature were polycrystalline in nature. Magnetic measurements reveal that films deposited at lower substrate temperature had lower magnetic moment compared to that of films grown with higher substrate temperature, indicating the correlation between magnetic order and crystallinity. This is attributed to the presence of ordered magnetic domains in the oriented films even though the microstructure remains the same.

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Sassykova, Larissa R., Binara T. Dossumova, Madina S. Ilmuratova, Tatyana V. Shakiyeva, Bedelzhan B. Baizhomartov, Albina R. Sassykova, Zhanar M. Zhaxibayeva, and Tleutai S. Abildin. "Development of nanostructured catalysts for catalytic oxidative water purification from organic impurities, including phenolic compounds." Chimica Techno Acta 10, no. 3 (August 22, 2023). http://dx.doi.org/10.15826/chimtech.2023.10.3.09.

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The purpose of this work was to create magnetic nanocatalysts that could be used for the oxidation of organic water pollutants – phenol and its derivatives – and to determine the physicochemical characteristics of the catalysts. The development of such active nanocomposite catalysts would solve the environmental problem in the Republic of Kazakhstan in the field of wastewater treatment from organic impurities, including phenols, and would also contribute to the subsequent creation of domestic production of oxygen-containing compounds, since almost the entire spectrum of oxygen-containing compounds for various industries is imported into the Republic. Nanosized magnetic composites based on Fe and Co were obtained by chemical deposition, in some cases, using polyethyleneimine and polyvinylpyrrolidone. It was shown that the interaction between nanoparticles and the polymer takes place in the case of a CoFe2O4 catalyst stabilized with polyvinylpyrrolidone or polyethyleneimine, which may indicate the efficient formation of nanocomposites. According to the IR study, for the CoFe2O4 nanocomposite stabilized with polyvinylpyrrolidone, the absorption bands at 735, 663, 649, 626 cm–1 are natural vibrations for the composite nanoparticles embedded in a polyvinylpyrrolidone matrix. The synthesized nanocomposites were tested in the oxidation of phenol with oxygen. The results demonstrate that the catalysts are promising both for the purification of industrial wastewater from phenol and for the synthesis of oxygen-containing compounds in the liquid phase under mild conditions.

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Franceschin, Giulia, Thomas Gaudisson, Nicolas Menguy, Raul Valenzuela, Frederic Mazaleyrat, and Souad Ammar. "On the limits of Reactive-Spark-Plasma Sintering to prepare magnetically enhanced nanostructured ceramics: the case of the CoFe2O4-NiO system." Scientific Reports 9, no. 1 (October 1, 2019). http://dx.doi.org/10.1038/s41598-019-50657-4.

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Abstract Magnetic materials are crucial for the efficiency of the conversion-storage-transport-reconversion energy chain, and the enhancement of their performance has an important impact on technological development. The present work explores the possibility of preparing hetero-nano-structured ceramics based on magnetic oxides, by coupling a ferrimagnetic phase (F) with an antiferromagnetic one (AF) on the nanometric scale. The field-assisted sintering technique or SPS (Spark-Plasma Sintering), adopted at this purpose, ensures the preservation of nano-sized crystals within the final solid structure. The aim is to establish how exchange bias may affect the resulting nano-consolidates and to investigate the potential of this process to increase the total magnetic anisotropy of the CoFe2O4 grains, and thus their coercive field, while keeping the saturation magnetization the same. The structure, microstructure and magnetic properties of the ceramics obtained were studied by several techniques. The results show that the sintering process, along with its typical reductive atmosphere, modifies the composition of the constituents. A new metallic phase appears as a consequence of the reciprocal diffusion of Co and Ni cations, leading to a change in the amount and structure of the AF phase. We propose a schematic representation of the atomic movements that hinder an exchange bias effect between the F and AF phases.

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Dutta, Sriparna, Prashant Kumar, Sneha Yadav, Ranjana Dixit, and Rakesh Kumar Sharma. "Recyclable magnetically retrievable nanocatalysts for C–heteroatom bond formation reactions." Physical Sciences Reviews, May 13, 2022. http://dx.doi.org/10.1515/psr-2021-0101.

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Abstract During recent years, magnetic separation has proven to be a highly indispensable and sustainable tool for facile separation of catalysts from the reaction medium with the aid of only an external magnetic force that precludes the requirement of energy intensive, solvent based centrifugation or filtration techniques. Extensive research in the area of catalysis has clearly divulged that while designing any catalyst, the foremost features that need to be paid due attention to include high activity, ready recoverability and good reusability. Fortunately, the magnetic nanocatalysts involving a superparamagnetic core material that could comprise of iron oxides such as magnetite, maghemite or hematite or mixed ferrites (CoFe2O4, CuFe2O4) have offered bright prospects of designing the ideal catalysts by proving their efficacy as strong support material that could be further engineered with various tools of nanotechnology and efficiently catalyze various C–heterobond formation reactions. This chapter provides succinct overview of all the approaches utilized for fabricating different types of magnetic nanoparticles and strategies adopted for imparting them durability. The prime forte however remains to exclusively showcase the applications of the various types of magnetic nanocatalysts in C–O, C–N, C–S and miscellaneous (C–Se, C–Te) bond formation reactions which are anticipated to benefit the synthetic community on a broad spectrum by helping them rationalize and analyze the key features that need to be taken into account, while developing these magical nanostructured catalytic systems for boosting the green bond formation reactions/transformations.

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Ahmed, Sufi R., and Peter Kofinas. "Synthesis And Magnetic Properties Of Block Copolymer-CoFe2O4 Nanoclusters." MRS Proceedings 661 (2000). http://dx.doi.org/10.1557/proc-661-kk10.10.

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ABSTRACTThe overall goal of this research is to explore techniques for the development of novel binary magnetic oxide nanoclusters uniformly distributed within a polymer matrix. These CoFe2O4 nanoclusters were synthesized at room temperature, and are confined within the self-assembled nanoscale structure exhibited by block copolymers templates. The diblock copolymers were synthesized by ring opening metathesis polymerization of norbornene and norbornene trimethylsilane and the binary magnetic oxide was introduced through a nanoreaction scheme using wet chemical methods. Transmission electron micrographs of microtomed thin sections of these nanocomposites show that the metal oxide nanoclusters are ellipsoidal in shape and are uniformly distributed within the polymer matrix. A SQUID magnetometer was used to study the magnetic properties of the polymeric nanocomposites at applied fields up to 5 Tesla and at a temperature range between 300 °K and 5 °K. Mössbauer spectroscopy was used to study the structure of the nanoconfined metal oxide, and confirmed the synthesis of CoFe2O4 nanoclusters exhibiting an inverse spinel structure. This study provided a better understanding of the nucleation, growth and distribution of metal oxide nanoclusters within block copolymers and indicated ways to control the magnetic properties of polymeric based nanocomposite materials. The development of such binary metal oxide - block copolymer nanocomposites is targeting the functionalization of such nanostructures into magnetic device technologies.

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Ahlawat, Anju, AZAM ALI KHAN, Pratik Deshmukh, Sushmita Bhartiya, Srinibas Satapathy, M. Shirolkar, Haiqian Wang, and Ram Janay Choudhary. "Strain assisted magnetoelectric coupling in ordered nanomagnets of CoFe2O4/SrRuO3/(Pb(Mg1/3Nb2/3)O3–PbTiO3) hetrostructures." Journal of Physics: Condensed Matter, May 13, 2022. http://dx.doi.org/10.1088/1361-648x/ac6fa6.

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Abstract We have explored the electric field controlled magnetization in the nanodot CoFe2O4/SrRuO3/PMN-PT heterostructures. Ordered ferromagnetic CFO nanodots (~300 nm lateral dimension) are developed on the PMN-PT substrate (ferroelectric as well as piezoelectric) using a nanostencil-mask pattering method during pulsed laser deposition. The nanostructures reveal electric field induced magnetization reversal in the single domain CFO nanodots through transfer of the piezostrains from the piezoelectric PMN-PT substrate to the CFO. Further, electric field modulated spin structure of CFO nanomagnets is analysed by using X-ray magnetic circular dichroism (XMCD). The XMCD analysis divulge cations (Fe3+/Co2+) redistribution on octahedral and tetrahedral site in the electric field poled CoFe2O4 nanodots, establishing the strain induced magneto-electric coupling effects.The CoFe2O4/SrRuO3/PMN-PT nanodots structure demonstrate multilevel switching of ME coupling coefficient (α) by applying selective positive and negative electric fields in a non-volatile manner. The retention of two stable states of α is illustrated for ~106seconds, which can be employedto store digital datain non-volatile memory devices. Thus the voltage controlled magnetization in the nanodot structures leads a path towards the invention of energy efficient high-density memory devices.

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Nairan, Adeela, Usman Khan, Dang Wu, and Junkuo Gao. "Structural and temperature-dependent magnetic characteristics of Ho doped CoFe2O4 nanostructures." Ceramics International, July 2022. http://dx.doi.org/10.1016/j.ceramint.2022.07.158.

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Khan, Usman, Adeela Nairan, Karim Khan, Ayesha Khan Tareen, Dang Wu, and Junkuo Gao. "Room and low-temperature magnetic characterization of Cr doped CoFe2O4 nanostructures." Solid State Sciences, September 2022, 107001. http://dx.doi.org/10.1016/j.solidstatesciences.2022.107001.

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Khan, Usman, Adeela Nairan, Karim Khan, Ayesha Khan Tareen, and Dang Wu. "Optical and Temperature-Dependent Magnetic Properties of Mn-Doped Cofe2o4 Nanostructures." SSRN Electronic Journal, 2023. http://dx.doi.org/10.2139/ssrn.4336743.

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