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Littérature scientifique sur le sujet « Cofelon »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 11 mars 2023

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Articles de revues sur le sujet "Cofelon"

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Chen, X. J., J. C. Xu, H. X. Jin, D. F. Jin, B. Hong, H. L. Ge et X. Q. Wang. « Preparation and Characterization of Magnetic Cobalt Ferrites/SBA-15 Nanocomposite Adsorbents and the Removal of Methylene Blue ». Nano 12, no 05 (28 mars 2017) : 1750060. http://dx.doi.org/10.1142/s1793292017500606.

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In this paper, ordered mesoporous SBA-15 silica was synthesized by the hydrothermal method, and then a series of CoFe2O4/SBA-15 nanocomposites were synthesized by a facile impregnation method. X-ray diffraction and N2 adsorption–desorption isotherms were used to characterize the microstructure and morphology of SBA-15 and CoFe2O4/SBA-15 nanocomposites. CoFe2O4 nanoparticles presented spinel phase structure and existed in the mesopores of SBA-15. The magnetic response of CoFe2O4/SBA-15 nanocomposites was characterized with vibrating sample magnetometer (VSM). The adsorption efficiency of CoFe2O4/SBA-15 nanocomposites for methylene blue increased firstly with the increasing CoFe2O4 content, and then decreased. Sample-2 (SBA-15: CoFe2O[Formula: see text]: 0.1 in the precursor) not only presented the best adsorptive performance, but also could be separated and retrieved effectively by magnetic separation technique.
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Duong, Hong Diu Thi, Dung The Nguyen et Kyo-Seon Kim. « Effects of Process Variables on Properties of CoFe2O4 Nanoparticles Prepared by Solvothermal Process ». Nanomaterials 11, no 11 (13 novembre 2021) : 3056. http://dx.doi.org/10.3390/nano11113056.

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Controlling the morphology and magnetic properties of CoFe2O4 nanoparticles is crucial for the synthesis of compatible materials for different applications. CoFe2O4 nanoparticles were synthesized by a solvothermal method using cobalt nitrate, iron nitrate as precursors, and oleic acid as a surfactant. The formation of CoFe2O4 nanoparticles was systematically observed by adjusting synthesis process conditions including reaction temperature, reaction time, and oleic acid concentration. Nearly spherical, monodispersed CoFe2O4 nanoparticles were formed by changing the reaction time and reaction temperature. The oleic acid-coated CoFe2O4 nanoparticles inhibited the growth of particle size after 1 h and, therefore, the particle size of CoFe2O4 nanoparticles did not change significantly as the reaction time increased. Both without and with low oleic acid concentration, the large-sized cubic CoFe2O4 nanoparticles showing ferromagnetic behavior were synthesized, while the small-sized CoFe2O4 nanoparticles with superparamagnetic properties were obtained for the oleic acid concentration higher than 0.1 M. This study will become a basis for further research in the future to prepare the high-functional CoFe2O4 magnetic nanoparticles by a solvothermal process, which can be applied to bio-separation, biosensors, drug delivery, magnetic hyperthermia, etc.
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Suharyadi, Edi, Afifah Muzakki, Nurul Imani Istiqomah, Deska Lismawenning Puspitarum, Budi Purnama et Dede Djuhana. « Reusability of Photocatalytic CoFe2O4@ZnO Core–Shell Nanoparticles for Dye Degradation ». ECS Journal of Solid State Science and Technology 11, no 2 (1 février 2022) : 023004. http://dx.doi.org/10.1149/2162-8777/ac4c7c.

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The reusability of CoFe2O4@ZnO core–shell nanoparticles (NPs) for the photocatalytic degradation of methylene blue (MB) under UV radiation was successfully investigated. CoFe2O4@ZnO NPs with various CoFe2O4–to–ZnO concentration ratios were synthesized as magnetic photocatalysts. The X-ray diffraction spectra showed that the NPs had a cubic spinel ferrite phase structure and a hexagonal wurtzite phase of ZnO. Fourier-transform infrared spectra showed the presence of Moct-O, Mtet-O, and Zn–O at 593, 347–389, and 410–429 cm−1, respectively. The CoFe2O4@ZnO NPs had a saturation magnetization of approximately 30 emu g−1 and a coercivity of approximately 280 Oe. The absorbance spectra showed that the absorbance peak of the CoFe2O4@ZnO NPs broadened and shifted to the right (higher wavelength) with increasing ZnO concentration. The CoFe2O4@ZnO NPs with higher ZnO concentrations exhibited higher photocatalytic activities and degradation rates. The enhancement of MB degradation can be attributed to the formation of an internal structure between CoFe2O4 and ZnO. The degradation rate of CoFe2O4@ZnO decreased slightly after each successive recycle. The results indicated that the recycled CoFe2O4@ZnO NPs could be reused three times for photocatalytic degradation. As there is no significant decrease in the photocatalytic degradation after four successive recycles, the CoFe2O4@ZnO NPs are suitable for application in dye degradation.
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Velayutham, Lakshmi, C. Parvathiraja, Dhivya Christo Anitha, K. Mahalakshmi, Mary Jenila, Fatmah Ali Alasmary, Amani Salem Almalki, Amjad Iqbal et Wen-Cheng Lai. « Photocatalytic and Antibacterial Activity of CoFe2O4 Nanoparticles from Hibiscus rosa-sinensis Plant Extract ». Nanomaterials 12, no 20 (19 octobre 2022) : 3668. http://dx.doi.org/10.3390/nano12203668.

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Biogenic CoFe2O4 nanoparticles were prepared by co-precipitation and Hibiscus rosa sinensis plant leaf was used as a bio-reductant of the nanoparticle productions. The biosynthesized CoFe2O4 nanoparticles were characterized by XRD, FTIR, UV, VSM, and SEM via EDX analysis. The cubic phase of biosynthesized CoFe2O4 nanoparticles and their crystallite size was determined by XRD. The Co-Fe-O bonding and cation displacement was confirmed by FTIR spectroscopy. The presence of spherically-shaped biosynthesized CoFe2O4 nanoparticles and their material were confirmed by SEM and TEM via EDX. The super-paramagnetic behaviour of the biosynthesized CoFe2O4 nanoparticles and magnetic pulse was established by VSM analysis. Organic and bacterial pollutants were eradicated using the biosynthesized CoFe2O4 nanoparticles. The spinel ferrite biosynthesized CoFe2O4 nanoparticles generate radical and superoxide ions, which degrade toxic organic and bacterial pollutants in the environment.
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Masoumparast, Mehrnaz, Masoud Mokhtary et Hassan Kefayati. « Preparation and characterization of polyvinylpyrrolidone/cobalt ferrite functionalized chitosan graphene oxide (CoFe2O4@CS@GO-PVP) nanocomposite ». Journal of Polymer Engineering 40, no 4 (28 avril 2020) : 342–49. http://dx.doi.org/10.1515/polyeng-2019-0331.

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AbstractCobalt ferrite functionalized chitosan graphene oxide (CoFe2O4@CS@GO) was inserted successfully in polyvinylpyrrolidone (PVP), and its distribution was distinguished through scanning electron microscope (SEM) analysis. Furthermore, the thermal and structural characterizations of the CoFe2O4@CS@GO-PVP nanocomposite were accomplished via the TGA, DSC, FT-IR, and XRD methods. The magnetic characterization of the synthesized nanocomposite was specified by vibrating sample magnetometer (VSM). Results demonstrated the improved thermal stability of pure PVP with the addition of CoFe2O4@CS@GO. The DSC analysis results also showed that the glass transition temperature of 158.9°C–164.8°C was obtained for the CoFe2O4@CS@GO-PVP nanocomposites. The FT-IR spectra indicated that an interaction occurred between CoFe2O4@CS@GO and PVP. Due to a good distribution of CoFe2O4@CS@GO in the PVP matrix, the strong interaction shown by the ~18 cm−1 red shift with good complexation of the carbonyl functional group of PVP with CoFe2O4@CS@GO was observed for the CoFe2O4@CS@GO-PVP (5% w/w) nanocomposite.
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Nugroho, Kacuk Cikal, Ubaidillah Ubaidillah, Retna Arilasita, Margono Margono, Bambang Hari Priyambodo, Budi Purnama, Saiful Amri Mazlan et Seung-Bok Choi. « The Effect of Sr-CoFe2O4 Nanoparticles with Different Particles Sized as Additives in CIP-Based Magnetorheological Fluid ». Materials 14, no 13 (1 juillet 2021) : 3684. http://dx.doi.org/10.3390/ma14133684.

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This study investigated the effect of adding strontium (Sr)-doped cobalt ferrite (CoFe2O4) nanoparticles in carbonyl iron particle (CIP)-based magnetorheological fluids (MRFs). Sr-CoFe2O4 nanoparticles were fabricated at different particle sizes using co-precipitation at calcination temperatures of 300 and 400 °C. Field emission scanning electron microscopy (FESEM) was used to evaluate the morphology of the Sr-CoFe2O4 nanoparticles, which were found to be spherical. The average grain sizes were 71–91 nm and 118–157 nm for nanoparticles that had been calcinated at 300 and 400 °C, respectively. As such, higher calcination temperatures were found to produce larger-sized Sr-CoFe2O4 nanoparticles. To investigate the rheological effects that Sr-CoFe2O4 nanoparticles have on CIP-based MRF, three MRF samples were prepared: (1) CIP-based MRF without nanoparticle additives (CIP-based MRF), (2) CIP-based MRF with Sr-CoFe2O4 nanoparticles calcinated at 300 °C (MRF CIP+Sr-CoFe2O4-T300), and (3) CIP-based MRF with Sr-CoFe2O4 nanoparticles calcinated at 400 °C (MRF CIP+Sr-CoFe2O4-T400). The rheological properties of these MRF samples were then observed at room temperature using a rheometer with a parallel plate at a gap of 1 mm. Dispersion stability tests were also performed to determine the sedimentation ratio of the three CIP-based MRF samples.
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Coldebella, E. H., E. F. Chagas, A. P. Albuquerque, R. J. Prado, M. Alzamora et E. Baggio-Saitovitch. « Study of Soft/Hard Bimagnetic CoFe2/CoFe2O4 Nanocomposite ». Journal of Nanoscience and Nanotechnology 21, no 10 (1 octobre 2021) : 5181–87. http://dx.doi.org/10.1166/jnn.2021.19369.

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We report an experimental study of the bimagnetic nanocomposites CoFe2/CoFe2O4. The precursor material, CoFe2O4 was prepared using the conventional stoichiometric combustion method. The nano-structured material CoFe2/CoFe2O4 was obtained by total oxygen reduction of CoFe2O4 using a thermal treatment at 350 °C in H2 atmospheres following the partial oxidation in O2 atmospheres at 380 °C during 120; 30; 15, 10, and 5 min. The X-ray diffraction, Mössbauer spectroscopy and transmission electronic microscopy images confirmed the formation of the material CoFe2/CoFe2O4. The magnetic hysteresis for the nanocomposite with different saturation magnetization (from 87 to 108 emu/g) also confirms the formation of the CoFe2/CoFe2O4 with different content of CoFe2O4. Furthermore, the magnetic hysteresis curves for all samples presented a single magnetic behavior, suggesting the magnetic coupling between the phases of the nanocomposite. The effects of high energy milling on the magnetic properties of the precursor material and nanocomposites samples were evaluated.
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Cernea, Marin, Roxana Radu, Harvey Amorín, Simona Gabriela Greculeasa, Bogdan Stefan Vasile, Vasile Adrian Surdu, Paul Ganea, Roxana Trusca, Marwa Hattab et Carmen Galassi. « Lead-Free BNT–BT0.08/CoFe2O4 Core–Shell Nanostructures with Potential Multifunctional Applications ». Nanomaterials 10, no 4 (3 avril 2020) : 672. http://dx.doi.org/10.3390/nano10040672.

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Herein we report on novel multiferroic core–shell nanostructures of cobalt ferrite (CoFe2O4)–bismuth, sodium titanate doped with barium titanate (BNT–BT0.08), prepared by a two–step wet chemical procedure, using the sol–gel technique. The fraction of CoFe2O4 was varied from 1:0.5 to 1:1.5 = BNT–BT0.08/CoFe2O4 (molar ratio). X–ray diffraction confirmed the presence of both the spinel CoFe2O4 and the perovskite Bi0.5Na0.5TiO3 phases. Scanning electron microscopy analysis indicated that the diameter of the core–shell nanoparticles was between 15 and 40 nm. Transmission electron microscopy data showed two–phase composite nanostructures consisting of a BNT–BT0.08 core surrounded by a CoFe2O4 shell with an average thickness of 4–7 nm. Cole-Cole plots reveal the presence of grains and grain boundary effects in the BNT–BT0.08/CoFe2O4 composite. Moreover, the values of the dc conductivity were found to increase with the amount of CoFe2O4 semiconductive phase. Both X-ray photoelectron spectroscopy (XPS) and Mössbauer measurements have shown no change in the valence of the Fe3+, Co2+, Bi3+ and Ti4+ cations. This study provides a detailed insight into the magnetoelectric coupling of the multiferroic BNT–BT0.08/CoFe2O4 core–shell composite potentially suitable for magnetoelectric applications.
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Falqui, Andrea, Anna Corrias, Peng Wang, Etienne Snoeck et Gavin Mountjoy. « A Transmission Electron Microscopy Study of CoFe2O4 Ferrite Nanoparticles in Silica Aerogel Matrix Using HREM and STEM Imaging and EDX Spectroscopy and EELS ». Microscopy and Microanalysis 16, no 2 (4 mars 2010) : 200–209. http://dx.doi.org/10.1017/s1431927610000061.

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AbstractMagnetic nanocomposite materials consisting of 5 and 10 wt% CoFe2O4 nanoparticles in a silica aerogel matrix have been synthesized by the sol-gel method. For the CoFe2O4-10wt% sample, bright-field scanning transmission electron microscopy (BF STEM) and high-resolution transmission electron microscopy (HREM) images showed distinct, rounded CoFe2O4 nanoparticles, with typical diameters of roughly 8 nm. For the CoFe2O4-5wt% sample, BF STEM images and energy dispersive X-ray (EDX) measurements showed CoFe2O4 nanoparticles with diameters of roughly 3 ± 1 nm. EDX measurements indicate that all nanoparticles consist of stoichiometric CoFe2O4, and electron energy-loss spectroscopy measurements from lines crossing nanoparticles in the CoFe2O4-10wt% sample show a uniform composition within nanoparticles, with a precision of at best than ±0.5 nm in analysis position. BF STEM images obtained for the CoFe2O4-10wt% sample showed many “needle-like” nanostructures that typically have a length of ∼10 nm and a width of ∼1 nm, and frequently appear to be attached to nanoparticles. These needle-like nanostructures are observed to contain layers with interlayer spacing 0.33 ± 0.1 nm, which could be consistent with Co silicate hydroxide, a known precursor phase in these nanocomposite materials.
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Puspitarum, Deska Lismawenning, Nurul Imani Istiqomah, Rivaldo Marsel Tumbelaka, Ahmad Kusumaatmaja, Daiki Oshima, Takeshi Kato et Edi Suharyadi. « High performance of magnetically separable and recyclable photocatalyst of green-synthesized CoFe2O4/TiO2 nanocomposites for degradation of methylene blue ». Advances in Natural Sciences : Nanoscience and Nanotechnology 13, no 4 (26 octobre 2022) : 045003. http://dx.doi.org/10.1088/2043-6262/ac996b.

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Abstract In this study, combination of ferromagnetic and semiconductor CoFe2O4/TiO2 nanocomposites was synthesised using a green synthesis method with Moringa oleifera leaf extract to easily obtain a magnetically separated nanomaterial exhibiting high photocatalytic activity. Nanocomposites with different CoFe2O4/TiO2 molar ratios were identified using x-ray diffraction (XRD), transmission electron microscopy, X-ray fluorescence, Fourier transform infrared spectroscopy, UV–visible spectroscopy, and vibration sample magnetometer. The XRD spectrum confirmed the structure of the cubic spinel ferrite and anatase phases of CoFe2O4 and TiO2, respectively. The crystallite sizes of CoFe2O4, CoFe2O4/TiO2, and CoFe2O4/3TiO2 are 7.2 nm, 8.6 nm, and 11.1 nm, respectively. The magnetic hysteresis curve showed that CoFe2O4/TiO2 had a high saturation magnetisation of 27 emu g−1 and a coercivity of 200 Oe. The optical bandgap energy for CoFe2O4/TiO2 was in the range 3.6–3.8 eV. Photocatalytic investigations were carried out using methylene blue (MB) under UV irradiation. Our results showed an increase in MB degradation with increasing TiO2 concentration. The maximum photodegradations using nanocomposites are 60.8%, 97.7%, 98.4%, 98.5%, and 98.7% at molar ratios of 1:0, 1:1, 1:2, 1:3, and 1:4, respectively, after 20 min. The increase in MB degradation was related to the formation of internal structures between CoFe2O4 and TiO2. The magnetic nanocomposites enabled separation between the photocatalyst and final degraded solution using a permanent magnet. When the degradation was above 90%, the nanocomposites could be recycled three times.
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Thèses sur le sujet "Cofelon"

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MERONI, VALENTINA. « Il diritto al confronto nel sistema processuale statunitense e influenze sul processo penale italiano ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2018. http://hdl.handle.net/10281/199207.

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Il diritto al confronto con il teste d'accusa come elemento fondante del sistema processuale angloamericano è stato posto alla base di importanti riforme del codice di rito. Tuttavia, il sistema di procedura penale italiano è fondato su principi costituzionali ostativi alla piena omologazione delle due tipologie di accertamento penale.
The right of the accused to confront with the witness against him is a milestone of the American adversarial trial. Even though it has inspired important reformations of the Italian criminal procedure code, the latter is based on a different set of constitutional principles. These fundamental differences prevent the Italian criminal trial from embracing the American confrontation's model to the fullest.
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Sauerwald, Frank. « Impedanzspektroskopie im System CoFe2O4-MnFe2O4 ». [S.l. : s.n.], 2005. http://archiv.ub.uni-marburg.de/diss/z2005/0094/.

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Coux, González Patricia de. « Integration of ferrimagnetic CoFe2O4 epitaxial films with silicon ». Doctoral thesis, Universitat Autònoma de Barcelona, 2013. http://hdl.handle.net/10803/129162.

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El continuo progreso en microelectrónica se debe al crecimiento exponencial con el tiempo del número de transistores por circuito integrado, dependencia conocida como ley de Moore. Esta ley se sigue cumpliendo, pero se va acercando a límites intrínsecos. Por ello ha emergido la alternativa “More tan Moore”, un enfoque complementario basado en conceptos radicalmente nuevos y en la introducción de nuevos materiales que mejoren las prestaciones de dispositivos. En particular, los óxidos funcionales representan una buena oportunidad para incrementar y desarrollar las respuestas de dispositivos de interés para una gran gama de aplicaciones. Esta tesis presenta un estudio sobre la integración de capas delgadas de CoFe2O4 sobre silicio. CoFe2O4 es ferromagnético y un aislante eléctrico a temperatura ambiente, que son las propiedades requeridas para ser utilizado como barrera túnel en un dispositivo de filtro de espín. Dicho dispositivo podría permitir la inyección de corrientes de espines polarizados en silicio, como alternativa a la inyección usando electrodos ferromagnéticos y barreras túneles pasivas. Sin obstante, un filtro de espín necesita una capa fina de CoFe2O4 de espesor nanométrico, inferior a 4-5 nm para permitir el efecto túnel, y una epitaxia de muy buena calidad para conservar el ferromagnetismo y el transporte por efecto túnel. La instabilidad termodinámica de CoFe2O4 con el silicio impone el uso de una capa barrera para su integración epitaxial. El mayor desafío reside en fabricar bicapas epitaxiales y extrafinas de CoFe2O4/barrera sobre silicio. El principal objetivo de esta tesis ha sido estudiar la posibilidad de realizar este objetivo. La capa barrera es crucial. Hemos llevado a cabo una estrategia de investigación en paralelo considerando varios candidatos. SrTiO3, pudiendo crecer de forma epitaxial sobre Si(001) y ya usado como substrato monocristalino para el depósito de CoFe2O4, ha sido una opción evidente. Hemos usado capas búfer de SrTiO3 gruesas (alrededor de 17 nm) fabricadas por colaboradores del INL-Lyon para crecer capas de CoFe2O4 epitaxiales y ferromagnéticas mediante depósito con láser pulsado (pulsed laser deposition, PLD). Sin embargo hemos encontrado difusión detitanio en el CoFe2O4, y que la intercara de SrTiO3/Si(001) podría ser inestable. Zirconia estabilizada con ítria (yttria-stabilized zirconia, YSZ) es otro óxido ampliamente usado como lámina barrera para la integración de óxidos sobre Si(001). Sin embargo siempre se usa siendo una barrera gruesa, con espesores de decenas de nanómetros y presentando una capa de SiOx en la intercara. Por ello hemos invesigado los mecanismos de crecimiento epitaxial de YSZ, con el fin de determinar los límites en la reducción de espesor de YSZ y de SiOx. Como resultado podemos obtener láminas barrera ultrafinas, de aproximadamente 2 nm de espesor y con menos de 1 nm de SiOx Ha sido posible usando PLD monitorizado con RHEED (reflection high energy electron diffraction). Usando estas láminas barrera, capas ultrafinas de CoFe2O4 epitaxiales presentan una orientación (111) y capas interfaciales de SiOx superiores a 2 nm de espesor. Aunque el resultado es remarcable, el espesor total de CFO/YSZ/SiOx es excesivo para un dispositivo de filtro de espín. También hemos utilizado barreras de Sc2O3 y Y2O3 sobre Si(111), proporcionadas por colaboradores del IHP-Frankfurt Oder. Son candidatos originales que no se habían combinado nunca con CoFe2O4. A pesar del gran desajuste estructural con el CoFe2O4, de entre 15 y 20%, el crecimiento de CoFe2O4 es epitaxial. La caracterización por microscopia electrónica en transmisión ha mostrado un mecanismo de crecimiento epitaxial por ajuste dominios. Las capas presentan una magnetización cercana a la del material masivo y sin capa interfacial de SiOx en las heteroestructuras de CoFe2O4/Y2O3/Si(111). Las barreras de Y2O3 son por tanto prometedoras para la estructura nanométrica requerida en un filtro de espín. Hemos demostrado que barreras ultrafinas de Y2O3, con un espesor inferior a 2 nm, permiten el crecimiento epitaxial de CoFe2O4, aunque las investigaciones sobre la estabilidad de la intercara no han sido concluyentes.
Microelectronics is progressing continuously by the exponential growth with time of the number of transistors per integrated circuit, the popularly known as “Moore’s Law”. This law is still valid but it is approaching intrinsic limits. The “More than Moore” is a complementary approach based on the use of radically new concepts as well as on the use of new materials in existing devices to improve performance. In particular, functional complex oxides represent an opportunity to extend and develop new devices functionalities with a wide range of applications. This thesis presents a study on the integration of CoFe2O4 thin films with silicon. CoFe2O4 is ferromagnetic and electrically insulating at room temperature, the properties required to be used as tunnel barrier in a spin filter device. This device could permit the injection of spin polarized currents in silicon, as an alternative to the injection using ferromagnetic electrodes and passive tunnel barriers. However the spin filter requires a nanometric CoFe2O4 film, thinner than 4-5 nm to allow tunneling, and has to be epitaxial with high crystalline quality to preserve the ferromagnetism and tunneling transport. The thermodynamical instability between CoFe2O4 and silicon imposes the use of a buffer layer for its epitaxial integration. The challenging goal is therefore fabricating ultrathin epitaxial CoFe2O4/buffer bilayers on silicon. Investigating the possibility to achieve such goal has been the main objective of this thesis. The buffer layer is critical. Thus we have followed a strategy based on investigating in parallel several candidates. SrTiO3, which can be grown epitaxially on Si(001) with sharp interface and that has been already used as single crystal to deposited CoFe2O4, has been a natural option. We have used thick (around 17 nm) SrTiO3 buffers fabricated by collaborators at INL-Lyon to grow by pulsed laser deposition (PLD) CoFe2O4, which is epitaxial and ferromagnetic. However, there is diffusion of Ti into CoFe2O4 and the SrTiO3/Si(001) interface could be unstable. Yttria-stabilized-zirconia (YSZ) has been other investigated material. It is widely used to grow oxides on Si(001), but having the YSZ buffershigh thickness of tens of nm and presence of interfacial SiOx. Here we have investigated the mechanisms of YSZ epitaxy to determine the limits reducing the YSZ thickness and the interfacial layer. Ultrathin buffers around 2 nm thick, with less than 1 nm thick SiOx layer, can be fabricated by reflection high energy electron diffraction (RHEED) assisted PLD. Ultrathin CoFe2O4 films subsequently grown were epitaxial, although (111) oriented and with the SiOx layers more than 2 nm thick. The result is remarkable, but the total thickness of CFO/YSZ/SiOx is excessive for a tunnel device. We have used also Sc2O3 and Y2O3 buffers on Si(111), provided by collaborators at IHP-Frankfurt Oder. They are original candidates never combined with CoFe2O4. In spite of the huge lattice mismatch of around 15 and 20% CoFe2O4 grows epitaxially. Detailed transmission electron microscopy (TEM) has showed a mechanism of domain matching epitaxy. The films present magnetization close to the bulk value and without interfacial SiOx layer in the CoFe2O4/Y2O3/Si(111) sample. Thus Y2O3 appear as very promising buffer layer and maybe convenient for the nanometric structure required in a spin filter. We have demonstrated that ultrathin Y2O3 buffers, less than 2 nm thick, permit epitaxial growth of CoFe2O4, although the investigation of the interface stability has not been conclusive.
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Maciel, Sara Alves. « Preparação e cracterização de compósitos de CoFe2O4/ZrO2 ». Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/5738.

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In this work, structural, morphological and magnetic properties of cobalt ferrite/zirconium oxide composites prepared via mechanical mixing of the powders were evaluated. Cobalt ferrite powders were obtained by coprecipitation, and some synthesis parameters were optimized, such as the speed of stirring , the concentration of base and metal solutions, in order to obtain stoichiometric ferrites (Fe3+/Co2+ = 2: 1) or near to it. Zirconium oxide powders were synthesized via sol-gel. The composites were analyzed by Atomic Absorption, Field Emission Scanning Electron Microscopy and Spectroscopy Dispersive Energy, Diffraction of X-rays, Infrared Spectroscopy and Vibranting Sample Magnetometry. It was observed the migration of cations between the ferrite and zirconia structures as a result of high diffusion between phases due to heat treatment. The analysis by Field Emission Scanning Electron Microscopy and Spectroscopy Dispersive Energy showed the different microstructures of aggregates present in the composites and the average diameter of the grains. The insertion of a magnetic phase on a non-magnetic matrix caused an increase in the saturation magnetization and the remanent magnetization, and decrease in coercivity as the cobalt ferrite content increases.
Neste trabalho, foram avaliadas propriedades estruturais, morfológicas e magnéticas de compósitos de ferrita de cobalto/óxido de zircônio, preparados via mistura mecânica dos pós. Os pós de ferrita de cobalto foram obtidos pelo método da coprecipitação, tendo seus parâmetros de síntese otimizados, tais como velocidade de agitação, concentração das soluções de base e dos metais, a fim de se obter ferritas estequiométricas (Fe3+/Co2+ = 2:1) ou próximas disso. Os pós de óxido de zircônio foram sintetizados via sol-gel. Os compósitos foram analisados por Absorção Atômica, Microscopia Eletrônica de Varredura com Emissão de Campo e Espectroscopia por Energia Dispersiva, Difratometria de Raios X, Espectroscopia na Região do Infravermelho e por Magnetometria de Amostra Vibrante. Foi observada a migração de cátions entre as estruturas da ferrita e da zircônia como consequência da alta difusão entre as fases devido ao tratamento térmico. A análise por Microscopia Eletrônica de Varredura com Emissão de Campo e Espectroscopia por Energia Dispersiva permitiu verificar as diferentes microestruturas dos agregados presentes nos compósitos e o diâmetro médio dos grãos. A inserção de uma fase magnética em uma matriz não magnética provocou aumento na magnetização de saturação e na magnetização remanescente, além de uma diminuição na coercividade à medida que o teor de ferrita de cobalto aumenta.
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Silva, Tatiane Quetly Muniz de Oliveira da. « Nanoestruturas multicomponentes de CoFe2O4/Ag visando aplicações biológicas ». reponame:Repositório Institucional da UnB, 2015. http://dx.doi.org/10.26512/2015.04.D.20553.

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Dissertação (mestrado)—Universidade de Brasília, Instituto de Física, Programa de Pós-Graduação em Física, 2015.
Nanopartículas multicomponentes magnéticas/metálicas tem atraído muito atenção devido as suas propriedades magnéticas e ópticas únicas. Essas heteroestruturas podem ser aplicadas em terapia biomedicinal e imagem ou podem ser utilizadas também como carregadores de droga. Neste trabalho foram preparadas nanopartículas multicomponentes de CoFe 2O4/Ag atrav és do método de Tollens. A síntese de nanopartículas de ferrita de cobalto (CoFe 2O4) foi feita pelo método de co-precipitação química, usando como bases precipitantes, metilamina (CH3NH2) e o hidróxido de sódio (NaOH). Posteriormente as nanopartículas magnéticas foram colocadas em solução contendo o complexo diaminprata e deixadas sob agitação por um determinado tempo. Por _m, este complexo foi reduzido à prata metálica por glicose. Os diâmetros das ferritas puras e das estruturas multicomponentes foram obtidos por meio de difração de raios x do pó. A análise estrutural revelou a formação de única fase cristalina para as nanopartículas de ferrita de cobalto. Para os nanocompósitos multicomponentes o padrão de DRX mostrou a presença de picos de difração correspondentes as estruturas cúbicas das ferritas e da prata. Foi observado que a intensidade dos picos de difração das partículas híbridas tem dependência da razão Ag=CoFe2O4: Do ponto de vista macroscópico, ao serem submetidas a um imã as nanopartículas multicomponentes foram atraídas pelo mesmo, con_rmando assim, o seu comportamento magnético. As medidas de microscopia eletrônica de transmissão (MET) com espectroscopia de energia dispersiva (EDS) possibilitaram a visualização da interação entre as superfícies das duas estruturas. Foi possível através desta técnica obter a composição qualitativa e quantitativa dos materiais em regiões específicas.
Magnetic/metallic nanoparticles multicomponent has attracted much attention due to their unique magnetic and optical properties. Such heterostructures can be applied to biomedicinal therapy or image and can also be used as drug carriers. In this work, multicomponent nanoparticles CoFe2O4/Ag were prepared by Tollens method. The synthesis of cobalt ferrite CoFe2O4 nanoparticles were made by chemical coprecipitation method and, as precipitating bases, we have used methylamine (CH3NH2) and sodium hydroxide (NaOH). Subsequently, the magnetic nanoparticles were placed in the solution containing the complex diamin silver and left stirring for a certain time. Finally, this complex is reduced to metallic silver by glucose The diameters of cobalt ferrite nanoparticles and multicomponent structures were obtained from the powder diffraction X-rays patterns. Structural analysis showed the single spinel phase for ferrites. For the hybrid nanocomposites, the XRD patterns showed the presence of peaks corresponding to the cubic structure of ferrite and silver. It was observed that the intensity of the diffraction peaks of multicomponent particles is ratio dependent. From a macroscopic point of view, the hybrid particles have been subjected to an external magnetic field and were attracted confirming the magnetic behavior. Transmission electron microscopy (TEM) measurements with energy dispersive spectroscopy (EDS) allowed the visualization of both silver and ferrite structure. It was possible with this technique to obtain qualitative and quantitative materials analysis in specific spots.
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Mozul, K., A. Ishchenko, A. P. Kryshtal, L. P. Olkhovik et Z. I. Sizova. « Magnetic Anisotropy of Ultra-small Nanocrystals of CoFe2O4 ». Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35365.

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Ferrimagnetic nanoparticles of CoFe2O4 with dimensions of 4-16 nm were synthesized by pyrolysis of a mixture of acetylacetonates of iron and cobalt. In the temperature range 300-500 K investigated field dependence of magnetization up o 18 kOe. Found a significant contribution of "surface" anisotropy to the effective anisotropy of the nanoparticles. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35365
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MAMELI, VALENTINA. « Colloidal CoFe2O4-based nanoparticles for Magnetic Fluid Hyperthermia ». Doctoral thesis, Università degli Studi di Cagliari, 2016. http://hdl.handle.net/11584/266766.

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In the field of biomedicine, important issues to address are the early-stage diagnosis and targeted therapies. Since the last two decades, magnetic nanoparticles have been proposed as potentially powerful due to their unique chemical-physical properties. Magnetic nanoparticles can be applied in a wide variety of biomedical fields from the magnetic separation and Magnetic Resonance Imaging (MRI) to drug delivery and Magnetic Fluid Hyperthermia (MFH).1 In particular, MFH is based on the heat released by magnetic nanoparticles subjected to an alternate external magnetic field. Among the different material features affecting the hyperthermic efficiency, the magnetic properties are clearly the most important. Therefore, the optimisation of the magnetic properties, aimed to increase the heating ability and to reduce the magnetic material dose to be inserted in the human body, is still an active research field. In 2013 alone, 682 works have been published in the literature on the topic of magnetic hyperthermia.2 Despite cobalt toxicity, cobalt-containing materials and especially cobalt ferrite nanoparticles have been proposed as promising heat mediators due to its high anisotropy.3–13 In this thesis, the results obtained on two different systems, designed with the idea of studying the effect on the hyperthermic properties of proper tuning of the magnetic properties, are presented. Both the sets of samples are based on cobalt ferrite nanoparticles. The first strategy consists on the substitution of cobalt ions with zinc ones with the aim of tuning the magnetic properties of the system and, at the same time, decrease the toxicity of the material. The second way is on the contrary represented by the coating of cobalt ferrite cores by means of biocompatible or less toxic isostructural phases (i.e. magnetite/maghemite or manganese ferrite).
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Oliveira, Neto Francisco de. « Caracterização estrutural e magnética do compósito cerâmico ZnO – CoFe2O4 ». Universidade Federal de Goiás, 2015. http://repositorio.bc.ufg.br/tede/handle/tede/5228.

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Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG
Multiferroic materials that simultaneously exhibit two or more physical properties have increasingly raised the interest of the scientific and technological community to develop new multifunctional materials. The discuss all stages of manufacturing, morphological, structural and magnetic characterization of a multifunctional composite containing zinc oxide and cobalt ferrite. Thus, studies of ZnO, and the CoFe2O4 composite (0,80ZnO+0,20 CoFe2O4) initiated by the synthesis of nanosized powders by combustion reaction phases were performed. The compounds studied were sintered at different temperatures (1100 to 1250°C) to obtain relative density near to 90% of the theoretical density. Analysis by scanning electron microscopy, spectroscopy energy dispersive, vibrating sample magnometry and diffraction ray-X were made. Measurements of magnetic properties were conducted at room temperature (22°C) and high temperature (22°C to 700°C). In the samples, formation of ceramic structures was verified, the stoichiometry of the proposed chemical compounds was maintained and possibly the formation of a mixed zinc and cobalt ferrite to composite samples. In the sample of the composite sintered at 1250°C there was the formation of cubic zinc oxide. The magnetic behavior and magnetic anisotropy of the samples were similar, however, significant differences were observed in the values of the Curie temperature, coercive field, can assume different origins for the magnetic CoFe2O4 and the composite (0,80ZnO+0,20CoFe2O4) due, perhaps to the formation of a mixed ferrite.
Materiais multiferróicos que exibem simultaneamente duas ou mais propriedades físicas têm cada vez mais suscitado o interesse da comunidade científica e tecnológica para o desenvolvimento de novos materiais multifuncionais. Objetivou-se discutir todas as etapas de fabricação e caracterização morfológica, estrutural e magnética de um compósito multifuncional contendo óxido de zinco e ferrita de cobalto. Assim, foram realizados estudos sobre as fases das amostras de ZnO, CoFe2O4 e o compósito (0,80ZnO+0,20CoFe2O4) iniciados pela síntese de pós nanométricos por via de reação de combustão. Os compostos estudados foram sinterizados em diferentes temperaturas (1100 e 1250°C) obtendo densidades relativas próximas a 90% das densidades teóricas. Foram efetuadas análises por microscopia eletrônica de varredura, espectroscopia de energia dispersiva, difratometria de raio-X e magnometria de amostra vibrante. As medidas de propriedades magnéticas foram realizadas à temperatura ambiente (22°C) e em função da temperaturas (22°C à 700°C) (altas temperaturas). Em todas as amostras estudadas foi verificada a formação de estruturas cerâmicas, mantendo a estequiometria dos compostos químicos propostos e possivelmente a formação de uma ferrita mista de zinco e cobalto para as amostras do compósito. Para a amostra do compósito sinterizada a 1250°C verificou-se também a formação de óxido de zinco cúbico. O comportamento magnético e a anisotropia magnética das amostras foram similares, entretanto diferenças significativas foram observadas nos valores obtidos da temperatura de Curie, do campo coercitivo e do momento magnético total, podendo supor origens magnéticas diferentes para o CoFe2O4 e o compósito de 0,80ZnO+0,20CoFe2O4 devido a formação de uma ferrita mista.
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Coux, González Patricia De. « Intégration de films épitaxiés de CoFe2O4 ferrimagnétiques sur silicium ». Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2273/.

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L'intégration de couches minces de CoFe2O4, ferromagnétique et isolant électrique à température ambiante, sur silicium pourrait être utilisée en tant que barrière tunnel dans un dispositif de filtre à spin, comme alternative à l'injection utilisant des électrodes ferromagnétiques et des barrières tunnel passives. L'instabilité thermodynamique entre CoFe2O4 et Si impose l'utilisation d'une couche tampon pour son intégration. L'exigeant défi est donc de fabriquer des bicouches épitaxiées et ultrafines afin de préserver le ferromagnétisme et le transport par effet tunnel. Nous avons adopté une stratégie de recherche en parallèle considérant différents candidats pour la couche tampon pour déposer des couches de CoFe2O4 par dépôt par laser pulsé (PLD). Nous avons utilisé des couches tampon de SrTiO3 épitaxiées sur Si(001) fabriquées par des collaborateurs de l'INL-Lyon. Une diffusion de Ti dans CoFe2O4, et une possible instabilité de l'interface SrTiO3/Si(001) ont été décelés. L'étude des mécanismes de croissance épitaxiale de l'yttrium stabilisé avec de la zircone (YSZ) sur Si(001) a permis de déterminer les limites de réduction d'épaisseur d'YSZ et de la couche interfaciale de SiOx par PLD monitorisé par RHEED. L'épaisseur de CFO/YSZ/SiOx résultante est excessive pour un dispositif de filtre à spin. Les buffers de Sc2O3 et Y2O3 sur Si(111), fournis par des collaborateurs de l'IHP-Frankfurt Oder présentent un grand désaccord paramétrique avec CoFe2O4, mais permettent sa croissance épitaxiale par domaines avec une magnétisation proche de celle du matériau massif. Y2O3 étant stable avec Si est très prometteurs pour la structure de filtre à spin
The integration of ferromagnetic and electrically insulating at room temperature CoFe2O4 thin films with silicon could be used as tunnel barrier in a spin filter device as an alternative to the injection using ferromagnetic electrodes and passive tunnel barriers. The thermodynamical instability between CoFe2O4 and Si imposes the use of a buffer layer for its epitaxial integration. The challenging goal is therefore fabricating ultrathin epitaxial CoFe2O4/buffer bilayers on silicon in order to preserve ferromagnetism and allow the tunnel transport. The followed strategy was based on investigating in parallel several buffer candidates to grow CoFe2O4 by pulsed laser deposition (PLD). We have used thick SrTiO3 buffers fabricated by collaborators at INL-Lyon, which is epitaxial and ferromagnetic. However, there is diffusion of Ti into CoFe2O4 and the SrTiO3/Si(001) interface could be unstable. The epitaxial growth mechanism of yttria-stabilized-zirconia (YSZ) was investigated to determine the limits reducing the YSZ thickness and the interfacial layer by reflection high energy electron diffraction (RHEED) assisted PLD. The total thickness of CFO/YSZ/SiOx is excessive for a tunnel device. Sc2O3 and Y2O3 buffers on Si(111), provided by collaborators at IHP-Frankfurt Oder presents a huge lattice mismatch with CoFe2O4, but allows it epitaxial growth by domain matching epitaxy with a magnetization close to the bulk value. The absence of interfacial SiOx layer in the CoFe2O4/Y2O3/Si(111) sample indicates that Y2O3 is a very promising buffer layer and maybe convenient for the nanometric structure required in a spin filter
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Zheng, Haimei. « Growth and characterization of multiferroic BaTiO3-CoFe2O4 thin film nanostructures ». College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/2026.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.
Thesis research directed by: Material Science and Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Livres sur le sujet "Cofelon"

1

R, Cohen Beverly, et Spiller Harley J, dir. The Cofeld Judaic Museum of Temple Beth Zion : An illustrated catalog of the collection. Buffalo, N.Y : Temple Beth Zion, 1985.

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Laboratório de Inovação em Enfermagem : Valorizar e Fortalecer a Saúde Universal. Pan American Health Organization, 2021. http://dx.doi.org/10.37774/9789275724842.

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L aboratório de Inovação em Enfermagem: Valorizar e Fortalecer a Saúde Universal, foi uma iniciativa, promovida pelo Conselho Federal de Enfermagem (Cofen) e pela Organização Pan-Americana da Saúde no Brasil (OPAS/OMS), que permitiu ter um panorama das estratégias adotadas pelos profissionais da Enfermagem ao enfrentar os desafios do sistema de saúde, como a necessidade de ampliar o acesso dos cidadãos aos cuidados de saúde, de melhorar a capacidade resolutiva dos serviços de saúde e da qualidade do cuidado ofertado e de reduzir custos e gastos em saúde, foi realizado no ano de 2019 até 2020. A edição procurou contribuir para a estratégia adotadas pela OPAS Brasil, desde 2008, para o intercâmbio de conhecimentos ao facilitar o contato horizontal entre responsáveis pela formulação e implementação de políticas e gestão do Sistema com os profissionais de saúde da ponta. Entre as suas virtudes está a capacidade de perceber e vivenciar a política de saúde no território, permitindo identificar potencialidades e fragilidades, mostrando para o gestor um panorama da política in loco. Estão reunidas, nesta publicação, 23 experiências mapeadas pelo Laboratório de Inovação em Enfermagem, que foram selecionadas a partir de dois grandes temas, sendo: 1) Valorização da Enfermagem e 2) Ampliação do escopo de prá- ticas de Enfermagem. Estas experiências foram exitosas, pois deram visibilidade ao trabalho da enfermagem brasileira, visto que foram rigorosamente selecionadas a partir de mais de 329 inscrições de estados de todas as regiões do país que traçam um panorama das estratégias adotadas por profissionais de enfermagem no enfrentamento aos desafios do sistema de saúde.
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Chapitres de livres sur le sujet "Cofelon"

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Zhang, X. X., A. Roig, J. M. Hernàndez, E. Molins, J. Tejada et R. F. Ziolo. « Magnetic Properties of Nanocrystalline CoFe2O4 Particles ». Dans Magnetic Hysteresis in Novel Magnetic Materials, 383–87. Dordrecht : Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5478-9_40.

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Charris-Hernandez, A., A. Kumar et M. S. Tomar. « Co-existence of Multiferroic Memories in CoFe2O4/Bi3.4Sm0.6Ti3O12 Composite Structures ». Dans Physics of Semiconductor Devices, 3–4. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03002-9_1.

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Rusanov, V., V. Gushterov, S. Nikolov et A. X. Trautwein. « Detailed Mössbauer study of the cation distribution in CoFe2O4 ferrites ». Dans ISIAME 2008, 397–404. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01370-6_52.

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Vadivel, M., R. Ramesh Babu, P. Selvakumar, M. Arivanandhan et K. Ramamurthi. « Structural, Dielectric and Magnetic Properties of La Substituted CoFe2O4 Nanoparticles ». Dans Springer Proceedings in Physics, 179–93. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-44890-9_18.

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Frolova, L. A., O. I. Kushnerov et Y. D. Galivets. « Effects of Ultrasonic Synthesis Variable on Basic Properties of CoFe2O4 Nanoparticles ». Dans Springer Proceedings in Physics, 19–28. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56422-7_2.

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Royer, F., D. Jamon, J. J. Rousseau, D. Zins, V. Cabuil, S. Neveu et H. Roux. « Magneto-optical properties of CoFe2O4 ferrofluids. Influence of the nanoparticle size distribution ». Dans Trends in Colloid and Interface Science XVII, 155–58. Berlin, Heidelberg : Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b94013.

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Sagadevan, Suresh, Jiban Podder et Isha Das. « Synthesis and Characterization of Cobalt Ferrite (CoFe2O4) Nanoparticles Prepared by Hydrothermal Method ». Dans Springer Proceedings in Physics, 145–52. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-44890-9_14.

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Bodale, I., M. Oprisan, C. Stan, F. Tufescu, M. Racuciu, D. Creanga et M. Balasoiu. « Nanotechnological Application Based on CoFe2O4 Nanoparticles and Electromagnetic Exposure on Agrotechnical Plant Growth ». Dans 3rd International Conference on Nanotechnologies and Biomedical Engineering, 153–56. Singapore : Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-287-736-9_37.

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Fernandez, Claudia P., Ruth H. G. A. Kiminami, Fabio Luiz Zabotto et Ducinei Garcia. « Microstructure and Magnetoelectric Properties of Microwave Sintered CoFe2O4-PZT Particulate Composite Synthesized in Situ ». Dans Ceramic Transactions Series, 279–91. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118995433.ch27.

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Shukla, R., R. S. Ningthoujam, S. S. Umare, S. J. Sharma, Sajith Kurian, R. K. Vatsa, A. K. Tyagi et N. S. Gajbhiye. « Decrease of superparamagnetic fraction at room temperature in ultrafine CoFe2O4 particles by Ag doping ». Dans ICAME 2007, 631–39. Berlin, Heidelberg : Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78697-9_86.

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Actes de conférences sur le sujet "Cofelon"

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Takamura, H., T. Kobayashi, A. Kamegawa et M. Okada. « Oxygen Permeation and Methane Conversion Properties of CERIA-Based Composite Membranes Prepared by Tape-Casting Technique ». Dans ASME 2004 2nd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2004. http://dx.doi.org/10.1115/fuelcell2004-2473.

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The preparation of ceria-based composite membranes by means of tape-casting technique and their oxygen permeation and methane reforming properties have been investigated. Oxide powders comprising of Ce1−xRExO2−δ (RE = Pr and Sm) and spinel-type ferrites of MFe2O4 (M = Mn and Co) were prepared by the citrate-based liquid-mix technique. As a result of the optimization of ceramics slurry composition, a crack-free dense membrane with dimensions of 5 cm × 5 cm and 140 μm in thickness was successfully prepared by means of doctor-blade technique. For Ce0.9Sm0.1O2−δ - 15 vol% MnFe2O4 membrane with a thickness of 133 μm, an oxygen flux density of 9.5 μmol/cm2 s was attained at 1000 °C under Ar-10% CH4 (100 sccm). The methane conversion and CO selectivity were 22 and 93%, respectively. Laminated membranes comprising of Ce0.9Sm0.1O2−δ - 15 vol% MnFe2O4 and Ce0.9Sm0.1O2−δ - 30 vol% CoFe2O4 were also prepared. The laminated membrane with one Ce0.9Sm0.1O2−δ - 30 vol% CoFe2O4 layer showed a higher oxygen flux density by a factor of 40% than that without Ce0.9Sm0.1O2−δ - 30 vol% CoFe2O4 layer.
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Labchir, Labchir. « Magneto-Electrodeposition of CoFe2O4 Nanowire Arrays ». Dans Nanotech France 2019 Conference & Exhibition. SETCOR Conferences and events, 2019. http://dx.doi.org/10.26799/cp-nanotechfrance2019/9.

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Allen, Kyle M., James F. Klausner, Eric N. Coker, Nick AuYeung et Rishi Mishra. « Synthesis and Analysis of Cobalt Ferrite in YSZ for Use as Reactive Material in Solar Thermochemical Water and Carbon Dioxide Splitting ». Dans ASME 2013 7th International Conference on Energy Sustainability collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/es2013-18254.

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This paper reports the synthesis, characterization and evaluation of different weight loadings of cobalt ferrite (CoFe2O4) in 8 mol% yttria-stabilized zirconia (8YSZ) via the co-precipitation method. Prepared powders were calcined at 1350 °C for 36 hours and 1450 °C for 4 hours in air. These powders were then formed into a porous structure using sacrificial pore formation via oxidation of co-mixed graphite powder. These formed structures obtained were then characterized using thermogravimetric analysis (TGA), X-ray diffraction (XRD), high temperature X-ray diffraction (HT-XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Brunauer-Emmett-Teller (BET) surface area analysis was performed on the most promising of the structures before being subjected to 50 thermal reduction-CO2 oxidation (redox) cycles using TGA. Together, these results indicate that CoFe2O4-8YSZ can provide a lower reduction temperature, maintain syngas production performance from cycle to cycle, and enhance utilization of the reactive material within the inert support in comparison to iron oxide only structures.
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Amarante, Mayara dos Santos, Gilberto Álvares da Silva et Vera Lúcia Othéro de Brito. « INFLUÊNCIA DA TEMPERATURA DE CALCINAÇÃO NA MICROESTRUTURA DE CoFe2O4 PROCESSADO PELO MÉTODO CERÂMICO : AVALIAÇÃO MICROESTRUTURAL DE CoFe2O4 ». Dans 69° Congresso Anual da ABM - Internacional. São Paulo : Editora Blucher, 2014. http://dx.doi.org/10.5151/1516-392x-25076.

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Pedrosa, F. J., J. Rial, K. M. Golasinski, J. Camarero et A. Bollero. « CoFe2O4 isotropic powders for permanent magnet applications ». Dans IEEE EUROCON 2015 - International Conference on Computer as a Tool (EUROCON). IEEE, 2015. http://dx.doi.org/10.1109/eurocon.2015.7313784.

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Wu, H., Q. Zhang, C. Wan, S. Ali, L. You, J. Wang, Y. Choi et X. Han. « Spin hall magnetoresistance in CoFe2O4/Pt films ». Dans 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7157176.

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Axelsson, Anna-Karin, Frederic Aguesse, Neil McN Alford et Matjaz Valant. « Role of interfaces in nanostructured CoFe2O4 films ». Dans 2012 Joint 21st IEEE ISAF / 11th IEEE ECAPD / IEEE PFM (ISAF/ECAPD/PFM). IEEE, 2012. http://dx.doi.org/10.1109/isaf.2012.6297866.

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Verma, Kavita, K. R. Patel, Sahi Ram et S. K. Barbar. « Synthesis and characterization of Cr doped CoFe2O4 ». Dans INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015) : Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946148.

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Josh, Seema, Manoj Kumar, Himanshu Pandey et Sandeep Chhoker. « Optical properties of Gd3+ substituted CoFe2O4 Nanoparticles ». Dans INTERNATIONAL CONFERENCE ON PHOTONICS, METAMATERIALS & PLASMONICS : PMP-2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5120921.

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Silva, Wesley Oliveira da, Mattheus Torquato, André Ben-Hur da Silva Figueiredo, Wagner Anacleto Pinheiro et Luiz Eduardo Pizarro Borges. « PROCESSAMENTO DO NANOCOMPÓSITO COFE2O4/RGO PELO MÉTODO HIDROTÉRMICO ». Dans 74º Congresso Anual da ABM. São Paulo : Editora Blucher, 2019. http://dx.doi.org/10.5151/2594-5327-33745.

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Rapports d'organisations sur le sujet "Cofelon"

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Baker, A. A., M. W. Worthington, S. E. Baker, J. I. Lee, C. A. Orme, J. Kuntz, T. van Buuren et S. K. McCall. Exchange Coupling in Nano-Textured SmCo5/Fe and Ni/CoFe2O4 Permanent Magnets. Office of Scientific and Technical Information (OSTI), mars 2018. http://dx.doi.org/10.2172/1430911.

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