Bibliografie tematiche / Fluorinated graphite

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Letteratura scientifica selezionata sul tema "Fluorinated graphite"

Autore: Grafiati

Pubblicato: 14 settembre 2024

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Articoli di riviste sul tema "Fluorinated graphite"

Herraiz, Michael, Marc Dubois, Nicolas Batisse, Samar Hajjar-Garreau e Laurent Simon. "Large-scale synthesis of fluorinated graphene by rapid thermal exfoliation of highly fluorinated graphite". Dalton Transactions 47, n. 13 (2018): 4596–606. http://dx.doi.org/10.1039/c7dt04565d.

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Kang, Wenze, e Shangyi Li. "Preparation of fluorinated graphene to study its gas sensitivity". RSC Advances 8, n. 41 (2018): 23459–67. http://dx.doi.org/10.1039/c8ra03451f.

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Sysoev, Vitalii I., Mikhail O. Bulavskiy, Dmitry V. Pinakov, Galina N. Chekhova, Igor P. Asanov, Pavel N. Gevko, Lyubov G. Bulusheva e Alexander V. Okotrub. "Chemiresistive Properties of Imprinted Fluorinated Graphene Films". Materials 13, n. 16 (11 agosto 2020): 3538. http://dx.doi.org/10.3390/ma13163538.

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The electrical conductivity of graphene materials is strongly sensitive to the surface adsorbates, which makes them an excellent platform for the development of gas sensor devices. Functionalization of the surface of graphene opens up the possibility of adjusting the sensor to a target molecule. Here, we investigated the sensor properties of fluorinated graphene films towards exposure to low concentrations of nitrogen dioxide NO2. The films were produced by liquid-phase exfoliation of fluorinated graphite samples with a composition of CF0.08, CF0.23, and CF0.33. Fluorination of graphite using a BrF3/Br2 mixture at room temperature resulted in the covalent attachment of fluorine to basal carbon atoms, which was confirmed by X-ray photoelectron and Raman spectroscopies. Depending on the fluorination degree, the graphite powders had a different dispersion ability in toluene, which affected an average lateral size and thickness of the flakes. The films obtained from fluorinated graphite CF0.33 showed the highest relative response ca. 43% towards 100 ppm NO2 and the best recovery ca. 37% at room temperature.

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Ahmad, Yasser, Nicolas Batisse, Xianjue Chen e Marc Dubois. "Preparation and Applications of Fluorinated Graphenes". C 7, n. 1 (7 febbraio 2021): 20. http://dx.doi.org/10.3390/c7010020.

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The present review focuses on the numerous routes for the preparation of fluorinated graphene (FG) according to the starting materials. Two strategies are considered: (i) addition of fluorine atoms on graphenes of various nature and quality and (ii) exfoliation of graphite fluoride. Chemical bonding in fluorinated graphene, related properties and a selection of applications for lubrication, energy storage, and gas sensing will then be discussed.

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Vul'f, V. A., Natal'ya Vladimirovna Polyakova e Sergei Anatol'evich Fateev. "Effect of feedstock on the characteristics of cathodes fluorinated carbon". Electrochemical Energetics 11, n. 4 (2011): 193–99. http://dx.doi.org/10.18500/1608-4039-2011-11-4-193-199.

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The electrode behavior of various fluorinated graphite materials and different conductive additives in various electrolytes are studied. Fluorocarbon materials based on graphite fibers are shown to have the best discharge characteristics. The advantage of thin cathodes based on fluorinated nanomaterials with a solid polymer electrolyte in comparison with the similar electrodes with traditional fluorocarbon active material is demonstrated. The use of fluorinated nanomaterials results in increased discharge characteristics of the cells.

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Gupta, Vinay, Tsuyoshi Nakajima e Yoshimi Ohzawa. "Fluorination of Graphite at High Temperatures". Collection of Czechoslovak Chemical Communications 67, n. 9 (2002): 1366–72. http://dx.doi.org/10.1135/cccc20021366.

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Graphite powder (57-74 μm) was fluorinated at 380 °C for 1 h-2 weeks. The composition of the products ranged from CF0.055 to CF0.659. X-Ray diffractometry showed the formation of graphite fluoride, (C2F)n with a trace of CxF phase with planar layers in addition to unreacted graphite which finally disappeared. Raman spectroscopy clearly revealed the existence of a fluorinated phase with planar layers with sp2 structure.

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Chen, Li, Jiaojiao Lei, Fuhui Wang, Guochao Wang e Huixia Feng. "Facile synthesis of graphene sheets from fluorinated graphite". RSC Advances 5, n. 50 (2015): 40148–53. http://dx.doi.org/10.1039/c5ra00910c.

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Chakraborty, Soma, Wenhua Guo, Robert H. Hauge e W. E. Billups. "Reductive Alkylation of Fluorinated Graphite". Chemistry of Materials 20, n. 9 (maggio 2008): 3134–36. http://dx.doi.org/10.1021/cm800060q.

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Dubois, Marc, Katia Guérin, Yasser Ahmad, Nicolas Batisse, Maimonatou Mar, Lawrence Frezet, Wael Hourani et al. "Thermal exfoliation of fluorinated graphite". Carbon 77 (ottobre 2014): 688–704. http://dx.doi.org/10.1016/j.carbon.2014.05.074.

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Hagaman, E. W. "The characterization of fluorinated graphite". Fuel and Energy Abstracts 37, n. 3 (maggio 1996): 184. http://dx.doi.org/10.1016/0140-6701(96)88553-5.

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Tesi sul tema "Fluorinated graphite"

Herraiz, Michael. "Graphène et fluorographène par exfoliation de graphite fluoré : applications électrochimiques et propriétés de surface". Thesis, Université Clermont Auvergne‎ (2017-2020), 2018. http://www.theses.fr/2018CLFAC094/document.

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Sa conductivité électronique ou encore sa transparence optique sont autant de propriétés physico-chimiques singulières du graphène qui expliquent le nombre accru de méthodes d’exfoliation de précurseurs graphitiques développées pour l’obtention de ce matériau. Pour palier à l’utilisation d’un oxyde de graphite/graphène caractérisé par une chimie de surface mal maitrisée, des graphites fluorés, de cristallinité mais aussi de concentration en fluor variables, ont été préparés par fluoration de graphite sous fluor moléculaire pur après optimisation des paramètres. Les précurseurs, que ce soit par fluoration dynamique ou statique, ainsi obtenus ont été caractérisés finement : diffraction des rayons X, spectroscopies IR et Raman et leur texture sondée par Microscopie Electronique à Balayage et à Transmission. Suite à cela, trois méthodes d’exfoliation ont été mises en place, basées sur des mécanismes différents : i) une exfoliation par choc thermique, déjà connue mais dont les mécanismes de décomposition ont été affinés dans cette étude, ii) une exfoliation en voie liquide, avec l’utilisation pour la première fois d’un graphite fluoré pour la synthèse de graphène fluoré multi feuillets par voie électrochimique pulsée, et enfin iii) une méthode originale, peu conventionnelle, basée sur l’interaction laser femtoseconde/graphite hautement fluoré pour induire des mécanismes de réduction contrôlée, et surtout d’exfoliation de la matrice. Ces méthodes ont permis de mettre en évidence l’intérêt de la présence de fluor dans la course actuelle pour la synthèse de graphène, et ont montré l’obtention de matériaux graphéniques,possédant une fonction résiduelle fluorée intéressante pour certaines applications
Its electronic conductivity or its optical transparency are unequaled physicochemicalproperties of graphene which explain the increased number of exfoliation methods based ongraphitic precursors to obtain this material. To overcome the use of a graphite/graphene oxidecharacterized by a poorly controlled surface chemistry, graphite fluorides, with variablecrystallinity and also fluorine concentration, were prepared by fluorination of graphite under puremolecular fluorine atmosphere after optimization of the process parameters. The obtainedprecursors, whether by dynamic or static fluorination, were characterized : X-Ray diffraction, FTIRand Raman spectroscopies for the structure, and their texture probed by Scanning andTransmission Electron Microscopy. After that, three methods of exfoliation were developed, basedon different mechanisms: i) a thermal shock, already known but decomposition mechanisms wererefined in this study, ii) an exfoliation within liquid medium by pulsed electrochemical treatment,using for the first time a fluorinated graphite for the synthesis of few-layered fluorinated grapheneand finally iii) an unconventional method, based on the interaction between femtosecond laser andhighly fluorinated graphite to induce mechanisms like controlled reduction, and especially for thisstudy exfoliation of the matrix. These methods have permit to highlight the interest of fluorine inthe current race for the synthesis of graphene, and have shown the production of graphenematerials, having an interesting fluorinated residual functionalization for some applications

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Parker, Julia Elizabeth. "Adsorption at the solid/liquid interface : adsorption and mixing behaviour of fluorinated alkyl species on the surface of graphite". Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611213.

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Henry, Killian. "Nanodiamants et graphite fluorés pour des réflecteurs de neutrons nouvelle génération". Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0067.

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L'objectif de ces travaux de thèse était de synthétiser des nanomatériaux hautement diffusant à faible absorption neutronique, constitués uniquement de carbone et de fluor, ceci afin de combler le gap de réflectivité des neutrons lents dans la plage de vitesse des neutrons 90-600 m/s (se situant entre le meilleur supermiroir et le graphite). Les matériaux retenus étaient des nanodiamants de diamètre calibré (5 nm) et des graphites fluorés. Parmi les graphites fluorés, la phase (C2F)n, possède la distance interfeuillet la plus élevée (9 Å) permettant une réflectivité jusqu'à 220 m/s. Malgré la difficulté d'obtention de cette phase (C2F)n, de par son domaine de température de fluoration restreint (350-400 °C), la tendance à la surfluoration et le risque d'exfoliation, nous sommes parvenus à synthétiser des poudres de graphites fluorés à haute teneur en (C2F)n dont la teneur maximale obtenue est de 96 % de (C2F)n, avec une distance interplannaire d'environ 9 Å. Les mesures de réflectivité des neutrons sur ces échantillons ont révélé qu'un graphite fluoré riche en (C2F)n peut être utilisé comme un réflecteur efficace pour les neutrons lents. Des feuilles de graphites ont également été fluorées afin de palier l'impossibilité de densifier les poudres de graphite fluoré, critère essentiel pour la création de réflecteurs de neutrons. Des taux élevés en (C2F)n ont été obtenus, soit ~75 % et aucune exfoliation n'a été constatée. Toutes ces caractéristiques font que les feuilles de graphite fluoré se révèlent très prometteuses en tant que réflecteurs de neutrons lents. Les nanodiamants de détonation choisis pour ce travail, car disponibles en quantité industrielle, contiennent en surface une couche de carbone sp2 et des groupements hydrogénés et oxygénés absorbeurs de neutrons, ainsi que des impuretés métalliques activables sous flux neutronique. Il est montré dans ces travaux de thèse que l'utilisation de dichlore permet d'éliminer efficacement les impuretés métalliques des nanodiamants de détonation, et que la combinaison avec du fluor moléculaire convertie les groupements hydrogénés et oxygénés à la surface de ces nanoparticules en liaisons C-F apportant un caractère hydrophobe empêchant tout adsorption de molécules d'eau. Une méthode de concentration des impuretés métalliques a été développée au cours de ces travaux de thèse, ce qui a permis de lever le verrou que représente la limite des détections des appareils de caractérisation utilisés. Il s'est également avéré que le suivi de la température de combustion des nanodiamants de détonation constituait un bon indicateur de la pureté de ces derniers. Par ailleurs, la combinaison des traitements de chloration et de fluoration a permis d'augmenter de 200 °C la stabilité thermique de ces composés
The aim of this PhD work was to synthesize highly scattering nanomaterials with low neutron absorption, consisting solely of carbon and fluorine, in order to close the slow neutron reflectivity gap in the 90-600 m/s neutron velocity range (between the best supermirror and graphite). The materials selected were nanodiamonds with a calibrated diameter (5 nm) and fluorinated graphites. Among fluorinated graphites, the (C2F)n phase has the highest interplanar distance (9 Å), enabling reflectivity of up to 220 m/s. Despite the difficulty of obtaining this (C2F)n phase, due to its restricted fluorination temperature range (350-400°C), the tendency to over-fluorinate and the risk of exfoliation, we successfully synthesized fluorinated graphite powders with a high (C2F)n content, with a maximum content of 96 % (C2F)n and an interplanar distance of around 9 Å. Neutron reflectivity measurements of these samples revealed that (C2F)n-rich fluorinated graphite can be used as an effective reflector for slow neutrons. Graphite foils have also been fluorinated to overcome the impossibility of densifying fluorinated graphite powders, an essential criterion for the creation of neutron reflectors. High levels of (C2F)n were also obtained, i.e. ~75%, and no exfoliation was observed. All these characteristics make fluorinated graphite foils very promising as slow neutron reflectors. The detonation nanodiamonds are chosen for the purpose of developing new slow neutron reflectors because they are available in industrial quantities. They unfortunately contain a sp2 carbon shell on their surface and hydrogenated and oxygenated neutron-absorbing impurities, as well as metallic impurities that can be activated under neutron flux. It was shown in this study that the use of chlorine effectively eliminates metallic impurities from detonation nanodiamonds, and that the combination with molecular fluorine converts the hydrogenated and oxygenated groups present on the surface of these nanoparticles into C-F bonds, providing a hydrophobic character that prevents any subsequent adsorption of water molecules. A method for concentrating metallic impurities was developed during the course of this PhD work, which made it possible to overcome the detection limit of the characterization equipment used. It also proved that the combustion temperature of detonation nanodiamonds was a good indicator of their purity. In addition, the combination of chlorination and fluorination treatments increased the thermal stability of these compounds by 200 °C

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Yamamoto, Hiroki. "Syntheses, Structures, and Applications of Inorganic Materials Functionalized by Fluorine". Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263756.

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Sherpa, Sonam Dorje. "Preparation and characterization of plasma-fluorinated epitaxial graphene". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47575.

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The discovery of unique properties of graphene has led to the development of graphene for a variety of applications like integrated circuits, organic electronic devices, supercapacitors, sensors, and composite materials. Fluorination of graphene enables control of its physical, chemical, and electronic properties. Our initial studies demonstrated the viability of sulfur hexafluoride plasmas to fluorinate epitaxial graphene as a safer alternative to the commonly reported techniques of fluorination that include exposures to fluorine and xenon difluoride gas. Formation of carbon-fluorine bonds after SF6 plasma-treatment was confirmed by x-ray photoelectron spectroscopy. Raman spectroscopy and low-energy electron diffraction studies suggest that the framework of sp2-hybridized carbon atoms remains intact after the plasma-treatment. Increase in work function after the fluorination was determined by ultra-violet photoelectron spectroscopy. The findings of our subsequent investigation to controllably modify the work function of epitaxial graphene via plasma-fluorination indicate that the work function of fluorinated epitaxial graphene is controlled by the polarity of carbon-fluorine bonds. Further studies to investigate the effect of the surface topography of epitaxial graphene on the work function of plasma-fluorinated epitaxial graphene were performed using scanning Kelvin probe microscopy (SKPM). The results of SKPM characterization of plasma-fluorinated epitaxial graphene demonstrated that the increase in the work function of epitaxial graphene after plasma-treatment is independent of its surface topography, but non-uniform fluorination may result from non-uniformities in plasma density.

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Weerasinghe, Asanka Thushara. "Amplitude-Modulated Electrostatic Nanolithography in Fluourinated Graphene". University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1351564667.

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Withers, Freddie. "Chemical modification of graphene". Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/4081.

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In this thesis investigations into chemically modified graphene structures are presented. Chemical functionalization of graphene is the chemical attachment of molecules or atoms to the graphene surface via covalent or Van der Waals bonds, this process offers a unique way to tailor the properties of graphene to make it useful for a wide range of device applications. One type of chemical functionalization presented in this thesis is fluorination of graphene which is the covalent attachment of fluorine to the carbon atoms of graphene and the resultant material is fluorographene which is a wide band-gap semiconductor. For low fluorine coverage the low temperature electron transport is through localized states due to the presence of disorder induced sub-gap states. For high fluorine coverage the electron transport can be explained by a lightly doped semiconductor model where transport is through thermal activation across an energy gap between an impurity and conduction bands. On the other hand, at low temperatures the disorder induced sub-gap density of states dominates the electrical properties, and the conduction takes place via hopping through these localized states. In this thesis it is also shown that electron beam irradiation can be used to tune the coverage of fluorine adatoms and therefore control energy gap between the impurity and conduction bands. Futhermore, electron beam irradiation also offers a valuable way to pattern conductive structures in fluorinated graphene \textit{via} the irradiation-induced dissociation of fluorine from the fluorinated graphene. This technique can be extended to the patterning of semiconducting nano-ribbons in fluorinated graphene where the spatial localization of electrons is just a few nm. The second type of chemical functionalization presented in this thesis is the intercalation of few layer graphene with ferric chloride which greatly enhances the electrical conductivity of few layer graphene materials making them the best known transparent conductors.

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Hudson, David Christopher. "Two dimensional atomically thin materials and hybrid superconducting devices". Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/16034.

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In this thesis a variety of topics concerning 2D materials that have been separated from bulk layered crystals are discussed. Throughout the thesis, single and few layers of graphene, fluorinated graphene, MoS2 and WS2 are used. Two new methods of freely suspending 2D materials are presented as well as a method of removing the background from optical images. This aids contrast measurements for the determination of the number of layers. Fluorinated graphene is found to be sensitive to beta radiation; the resistance of fluorinated graphene transistors is shown to decrease upon exposure to the radiation. This happens due to the carbon-fluorine bond breaking. The sp3 hybridised structure of the fluorinated graphene is reduced back into the sp2 hybridised structure of pristine graphene. The superconducting properties of molybdenum-rhenium are characterised. It is shown to have a transition temperature of 7.5 K. It is also discovered that the material has a resistance to hydrofluoric acid; the acid etches nearly all other superconducting materials. This makes MoRe a possible candidate to explore superconductivity in conjunction with high mobility suspended graphene. To see if the material is compatible with graphene, a supported Josephson junction is fabricated. A proximity induced super current is sustained through the junction up to biases of ∼ 200 nA. The temperature dependence of the conductivity is measured for both suspended MoS2 and WS2 on a hexagonal boron nitride substrate. The dominant hopping mechanism that contributes to the conductivity at low temperatures is found to be Mott variable range hopping, with the characteristic T−1/3 dependence. The hopping transport is due to impurities that are intrinsic to the crystals, this is confirmed by comparing the results with those of supported devices on SiO2.

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McAllister, Kelly Denise. "Modification of the electronic properties of fluorinated epitaxial graphene with an electric bias". DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2014. http://digitalcommons.auctr.edu/dissertations/1598.

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Ultraviolet photoemission spectroscopy measurements reveal that there is notable variation of the electron density of states in valence bands near the Fermi level. Evolution of the electronic structure of fluorinated graphene as a function ofthe applied electric bias is investigated. The experimental results demonstrate that the tailoring of electronic band structure correlates with the interlayer coupling tuned by the applied bias. The change in the work function of fluorinated graphene demonstrates the ability of fluorination to modify electron emissions characteristics of graphene.

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Sahoo, Mamina, e Mamina Sahoo. "Fluorinated Graphene as Dielectrics for PET Graphene Transistor". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/69yhkv.

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Più fonti

Libri sul tema "Fluorinated graphite"

Martin, Long, e United States. National Aeronautics and Space Administration., a cura di. Fluorinated graphite fibers as a new engineering material: Promises and challenges. [Washington, DC: National Aeronautics and Space Administration, 1990.

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Fusaro, Robert L. Comparison of the tribological properties of fluorinated cokes and graphites. [Washington, DC]: National Aeronautics and Space Administration, 1987.

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New Fluorinated Carbons : Fundamentals and Applications: Progress in Fluorine Science Series. Elsevier Science & Technology Books, 2016.

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Capitoli di libri sul tema "Fluorinated graphite"

Asanov, I. P., P. P. Semyannikov e V. M. Paasonen. "Study of Fluorinated Graphite Intercalation Compounds". In New Trends in Intercalation Compounds for Energy Storage, 447–54. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0389-6_29.

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Burgess, James S., Jeffrey W. Baldwin, Jeremy T. Robinson, Felipe A. Bulat e Brian H. Houston. "Fluorinated Carbon Nanomaterials: XeF2Fluorination of Graphene". In ACS Symposium Series, 11–30. Washington, DC: American Chemical Society, 2011. http://dx.doi.org/10.1021/bk-2011-1064.ch002.

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Meng, Saiqin, Xiaolong Fu, Liping Jiang, La Shi e Jiangning Wang. "Research Progress on the Application of Fluorinated Graphene in Energetic Materials". In Springer Proceedings in Physics, 573–93. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1774-5_43.

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Feng, Mengke, Guorong Cao e Jiazi Shi. "Effect of Film-Forming Conditions on the Properties of Fluorinated Acrylate Film". In Advanced Graphic Communications, Packaging Technology and Materials, 793–800. Singapore: Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-10-0072-0_98.

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DU, Fang, Yanwei Wang, Huisi Wang, Danchun Huang, Yanqing Ding, Hong Chen, Lei Li, Bowen Tao e Jian Gu. "Study on the Construction and Basic Application of Fluorinated Graphene Modified Magnesium Borohydride". In Springer Proceedings in Physics, 545–56. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1774-5_41.

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Hamwi, A., K. Guérin e M. Dubois. "Fluorine-intercalated graphite for lithium batteries". In Fluorinated Materials for Energy Conversion, 369–95. Elsevier, 2005. http://dx.doi.org/10.1016/b978-008044472-7/50045-x.

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Matsuo, Yoshiaki. "Battery application of graphite intercalation compounds". In Fluorinated Materials for Energy Conversion, 397–417. Elsevier, 2005. http://dx.doi.org/10.1016/b978-008044472-7/50046-1.

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Nakajima, T. "Lithium–Graphite Fluoride Battery—History and Fundamentals". In New Fluorinated Carbons: Fundamentals and Applications, 305–23. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-803479-8.00013-9.

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Enoki, Toshiaki, Morinobu Endo e Masatsugu Suzuki. "GICs and Batteries". In Graphite Intercalation Compounds and Applications. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195128277.003.0011.

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Intercalation can be defined as the process of inserting atoms or molecules (guest chemical species) between layers in a host material with layered structure such as graphite. Intercalation can be achieved using a solid, liquid, or gaseous intercalate reagent, as discussed in Chapter 2. However, preparation from the vapor is the most common. When graphite is used as a host material, a high degree of three-dimensional (3D) structural ordering is generally desired. The intercalation rate and the resulting intercalate concentration are strongly dependent on the intercalation conditions, such as pressure, temperature difference between the host graphite material and the intercalate, the physical dimensions of the sample, the degree of crystalline order, and the defect density within the host graphite material. The most important factors for controlling the physicochemical properties of GICs are the host material and the types of intercalate. Compared with other host materials, fibrous materials, including vapor-grown carbon fibers (VGCFs) (Dresselhaus et al., 1988), have shown particular suitability for GIC from the viewpoint of practical applications. Fiber hosts are normally intercalated using techniques similar to those considered for HOPG-based GICs, though the specific intercalation conditions may be different with regard to intercalation temperature, time, and other conditions. It is noteworthy that the intercalation of chemical species within fiber hosts is successful at lower temperature ranges than for bulk graphite or HOPG host materials (Meschi, 1988; Meschi et al., 1986). Because of the small size of the fibrous hosts, with diameter around 10 μm , the intercalation time tends to be shorter. With regard to the kinetics, the intercalation of fibers is initiated at the free edges of the fibers and then proceeds along the fiber length, thus depending on the macroscopic structure or morphology of the host fibers (Shioya et al., 1986). Fibers prepared from polymeric precursors can be intercalated in the radial direction (Goldberg and Kalnin, 1981). However, for the case of low crystalline fibrous carbon such as PAN-based carbon fiber, it is very difficult to fully form intercalated materials. On the other hand, covalent GICs such as fluorinated graphite and graphite oxide can be synthesized (see Sections 2.3.4 and 9.1.8).

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Bulusheva, L. G., e A. V. Okotrub. "Electronic Structure of Fluorinated Graphene". In New Fluorinated Carbons: Fundamentals and Applications, 177–213. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-803479-8.00008-5.

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Atti di convegni sul tema "Fluorinated graphite"

Alam, Todd. "Characterizing Disorder and Defect Structures in Fluorinated Graphite Using NMR ." In Proposed for presentation at the American Chemical Society (ACS) National Meeting and Expo held August 22-27, 2021 in Athens, GA US. US DOE, 2021. http://dx.doi.org/10.2172/1884426.

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Seto, Kelvin S. H., e Brian M. Ikeda. "Model Passivated Carbon Electrodes for Fluorine Generation in MSRs and the Nuclear Fuel Cycle". In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16642.

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Elemental fluorine, F2, is used in the nuclear fuel cycle for the isotopic separation of uranium-235 and 238, as well as for the purification of LiF-BeF2 in molten salt reactors. F2 is generated on an industrial scale by an electrochemical process using carbon electrodes in a KF-2HF molten salt. Carbon electrodes are used for industrial F2 generation due to its chemical stability, high conductivity, and relatively low cost. One of the main issues faced when using carbon electrodes in this chemical system is passivation through the formation of C-F compounds on the surface of the electrode. This results in a loss of anode wettability to the electrolyte and diminished charge transfer rate. The voltage needed for the fluorine evolution reaction increases which negatively impacts the safety of the system, increases the operating costs, and leads to faster degradation of the electrode. The degradation of electrical properties during passivation is progressive, eventually leading to electrode deactivation. The process of deactivation begins with a passivating C-F layer at potentials above the equilibrium potential (2.92 V). The layer is both non-wetting to the KF-2HF media and insulating. Deactivation begins with inhibited F2 bubble detachment, formation of a persistent gas layer, and finally deactivation as the electrode surface is completely covered by a thick, insulating C-F layer causing charge transfer to cease. Only a small current is able to flow, even at high potentials (up to 9 V), indicating F2 generation is completely inhibited. The purpose of this study is to manufacture and test model carbon electrodes and, to examine the non-wetting properties of a partially fluorinated surface. The electrodes will be prepared by mixing PTFE-particles with Vulcan carbon powder and then pressing to form pellets. These electrodes should have a reproducible surface for electrochemical performance studies that will lead to a better understanding of the surface chemistry. The research will develop novel electrodes with a goal to minimize the voltage required for F2 production. This will enhance the efficiency in the overall process and lower the manufacturing costs for F2. Carbon electrodes with different PTFE-content (20 w.% and 35 w.%) were synthesized. Electrochemical fluorination was then carried out at different potentials in the F2 generation region (4 to 8 V) in molten KF·2HF electrolyte at ∼90 °C. The electrochemical behaviour of the carbon-PTFE electrodes was examined and compared for both fluorine passivated and non-passivated graphite, amorphous carbon, and vitreous carbon electrodes. The growth of the electrical double-layer capacitance between the carbon electrodes and the KF·2HF molten salt was studied. The effects of composition of fluorinated and non-fluorinated carbon on electrode performance are presented.

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Marple, B. R., e J. Voyer. "Improved Wear Performance by the Incorporation of Solid Lubricants During Thermal Spraying". In ITSC 2000, a cura di Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0909.

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Abstract For components that are required to function in sliding or rubbing contact with other parts, degradation often occurs through wear due to friction between the two contacting surfaces. Depending on the nature of the materials being used, the addition of water as a lubricant may introduce corrosion and accelerate the degradation process. To improve the performance and increase the life of these components, coatings may be applied to the regions subject to the greatest wear. These coatings may be engineered to provide internal pockets of solid lubricant in order to improve the tribological performance. In the present study, coatings containing a solid lubricant were produced by thermal spraying feedstock powders consisting of a blend of tungsten carbide-metal and a fluorinated ethylene-propylene copolymer-based material. The volume content of this Teflon-based material in the feedstock ranged from 3.5 to 36%. These feedstocks were deposited using a high velocity oxy-fuel system to produce coatings having a level of porosity below 2%. Sliding wear tests in which coated rotors were tested in contact with stationary carbon-graphite disks identified an optimum level of Teflon-based material in the feedstock formulation required to produce coatings exhibiting minimum wear. This optimum level was in the range of 7-17% by volume and depended on the composition of the cermet constituent. Reductions in mass loss for the couples on the order of 50% (an improvement in performance by a factor of approximately two) were obtained for the best-performing compositions, as compared to couples m which the coating contained no solid lubricant.

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Hajian, S., B. B. Narakathu, D. Maddipatla, S. Masihi, M. Panahi, R. G. Blair, B. J. Bazuin e M. Z. Atashbar. "Flexible Temperature Sensor based on Fluorinated Graphene". In 2020 IEEE International Conference on Electro Information Technology (EIT). IEEE, 2020. http://dx.doi.org/10.1109/eit48999.2020.9208256.

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Ho, Y. P., K. I. Ho, B. Liu e C. S. Lai. "Fluorinated Graphene as Passivation Layer of Graphene Field Effect Transistor". In 2015 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2015. http://dx.doi.org/10.7567/ssdm.2015.d-3-5.

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Hajian, S., X. Zhang, D. Maddipatla, B. B. Narakathu, J. I. Rodriguez-Labra, R. G. Blair e M. Z. Atashbar. "Flexible Capacitive Humidity Sensor based on Fluorinated Graphene". In 2019 IEEE SENSORS. IEEE, 2019. http://dx.doi.org/10.1109/sensors43011.2019.8956564.

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Hajian, S., P. Khakbaz, B. B. Narakathu, S. Masihi, M. Panahi, D. Maddipatla, V. Palaniappan, R. G. Blair, B. J. Bazuin e M. Z. Atashbar. "Humidity Sensing Properties of Halogenated Graphene: A Comparison of Fluorinated Graphene and Chlorinated Graphene". In 2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS). IEEE, 2020. http://dx.doi.org/10.1109/fleps49123.2020.9239564.

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Kurkina, I. I., I. V. Antonova e S. A. Smagulova. "Fluorinated graphene suspension: Creation, properties, and perspective of applications". In 6TH INTERNATIONAL CONFERENCE ON PRODUCTION, ENERGY AND RELIABILITY 2018: World Engineering Science & Technology Congress (ESTCON). Author(s), 2018. http://dx.doi.org/10.1063/1.5079343.

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Sharin, Egor P., Rodion N. Zakharov e Kirill V. Evseev. "First-principles calculation of electronic properties of fluorinated graphene". In 6TH INTERNATIONAL CONFERENCE ON PRODUCTION, ENERGY AND RELIABILITY 2018: World Engineering Science & Technology Congress (ESTCON). Author(s), 2018. http://dx.doi.org/10.1063/1.5079355.

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Hajian, S., X. Zhang, D. Maddipatla, B. B. Narakathu, A. J. Hanson, R. G. Blair e M. Z. Atashbar. "Development of a Fluorinated Graphene-Based Flexible Humidity Sensor". In 2019 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS). IEEE, 2019. http://dx.doi.org/10.1109/fleps.2019.8792254.

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Rapporti di organizzazioni sul tema "Fluorinated graphite"

Pramanik, Avijit, Olorunsola Praise Kolawole, Kaelin Gates, Sanchita Kundu, Manoj Shukla, Robert Moser, Mine Ucak-Astarlioglu, Ahmed Al-Ostaz e Paresh Chandra Ray. 2D fluorinated graphene oxide (FGO)-polyethyleneimine (PEI) based 3D porous nanoplatform for effective removal of forever toxic chemicals, pharmaceutical toxins, and waterborne pathogens from environmental water samples. Engineer Research and Development Center (U.S.), febbraio 2024. http://dx.doi.org/10.21079/11681/48232.

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Although water is essential for life, as per the United Nations, around 2 billion people in this world lack access to safely managed drinking water services at home. Herein we report the development of a two-dimensional (2D) fluorinated graphene oxide (FGO) and polyethylenimine (PEI) based three-dimensional (3D) porous nanoplatform for the effective removal of polyfluoroalkyl substances (PFAS), pharmaceutical toxins, and waterborne pathogens from contaminated water. Experimental data show that the FGO-PEI based nanoplatform has an estimated adsorption capacity (𝘲ₘ) of ∼219 mg g⁻¹ for perfluorononanoic acid (PFNA) and can be used for 99% removal of several short- and long-chain PFAS. A comparative PFNA capturing study using different types of nanoplatforms indicates that the 𝘲ₘ value is in the order FGO-PEI > FGO > GO-PEI, which indicates that fluorophilic, electrostatic, and hydrophobic interactions play important roles for the removal of PFAS. Reported data show that the FGO-PEI based nanoplatform has a capability for 100% removal of moxifloxacin antibiotics with an estimated 𝘲ₘ of ∼299 mg g⁻¹. Furthermore, because the pore size of the nanoplatform is much smaller than the size of pathogens, it has a capability for 100% removal of Salmonella and Escherichia coli from water. Moreover, reported data show around 96% removal of PFAS, pharmaceutical toxins, and pathogens simultaneously from spiked river, lake, and tap water samples using the nanoplatform.

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