Modification of surface properties of carbon-based and polymeric materials through fluorination routes: From fundamental research to industrial applications

Tressaud, A.; Durand, Etienne; Labrugère, Christine; Kharitonov, A. P.; Kharitonova, Larisa N.

doi:10.1016/j.jfluchem.2006.12.015

Cited by 177 publications

(106 citation statements)

References 49 publications

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“…After oxyfluorination, the C(5) and C(6) components were observed in OFACF-1, OFACF-2, and OFACF-3 samples at 289.3 and 290.5 eV, corresponding to semi-covalent and covalent carbon-fluorine, respectively. All of these results are in accord with those from other studies [19,21,[27][28][29][33][34][35]. The concentration of C(3) and C(4) increased as the O 2 to F 2 ratio increased in the gas mixture, whereas the ratio only decreased in the OFACF-3 sample because there was insufficient fluorine gas to react with studies [27][28][29].…”

Section: Methodssupporting

confidence: 91%

Influence of oxyfluorination on activated carbon nanofibers for CO₂storage

Bai¹,

Kim²,

Im³

et al. 2011

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The oxyfluorination effects of activated carbon nanofibers (OFACFs) were investigated for CO 2 storage. Electrospun CFs were prepared from a polyacrylonitrile/N,N-dimethylformamide solution via electrospinning and heat treatment. The electrospun CFs were chemically activated in order to generate the pore structure, and then oxyfluorination was used to modify the surface. The samples were labeled CF (electrospun CF), ACF (activated CF), OFACF-1 (O 2 :F 2 = 7:3), OFACF-2 (O 2 :F 2 = 5:5) and OFACF-3 (O 2 :F 2 = 3:7). The functional group of OFACFs was investigated using X-ray photoelectron spectroscopy analysis. The C-F bonds formed on surface of ACFs. The intensities of the C-O peaks increased after oxyfluorination and increased the oxygen content in the reaction gas. The specific surface area, pore volume and pore size of OFACFs were calculated by the Brunauer-Emmett-Teller and density functional theory equation. Through the N 2 adsorption isotherm, the specific surface area and pore volume slightly decreased as a result of oxyfluorination treatment. Nevertheless, the CO 2 adsorption efficiency of oxyfluorinated ACF improved around 16 wt% due to the semi-ionic interaction effect of surface modificated oxygen functional groups and CO 2 molecules.

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Section: Methodssupporting

confidence: 91%

Influence of oxyfluorination on activated carbon nanofibers for CO₂storage

Bai¹,

Kim²,

Im³

et al. 2011

Carbon letters

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“…Typically, chemical methods [17,18] or plasma technology are used to increase the hydrophilicity of polymers [19,20] or to create reactive groups on the surface of inert materials [21]. Enzyme-based approaches would avoid the use of harsh chemicals [22] and/or require considerable less energy [23].…”

Section: Introductionmentioning

confidence: 99%

A New Esterase from Thermobifida halotolerans Hydrolyses Polyethylene Terephthalate (PET) and Polylactic Acid (PLA)

et al. 2012

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Abstract:A new esterase from Thermobifida halotolerans (Thh_Est) was cloned and expressed in E. coli and investigated for surface hydrolysis of polylactic acid (PLA) and polyethylene terephthalate (PET). Thh_Est is a member of the serine hydrolases superfamily containing the -GxSxG-motif with 85-87% homology to an esterase from T. alba, to an acetylxylan esterase from T. fusca and to various Thermobifida cutinases. Thh_Est hydrolyzed the PET model substrate bis(benzoyloxyethyl)terephthalate and PET releasing terephthalic acid and mono-(2-hydroxyethyl) terephthalate in comparable amounts (19.8 and 21.5 mmol/mol of enzyme) while no higher oligomers like bis-(2-hydroxyethyl) terephthalate were detected. Similarly, PLA was hydrolyzed as indicated by the release of lactic acid. Enzymatic surface hydrolysis of PET and PLA led to a strong hydrophilicity increase, as quantified with a WCA decrease from 90.8° and 75.5° to 50.4° and to a complete spread of the water drop on the surface, respectively. OPEN ACCESSPolymers 2012, 4 618

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“…Its use stems from the intrinsic stability and ability to generate high electrochemical energy as electrodes. These attributes are direct result of the extraordinary electro negativity of fluorine and exceptionally high free energy of formation of fluorides.The surface modification or fluorination of graphite 1-3 has been assumed to yield important electrode modifications by Tressaud et al,4 i.e., Surface oxygen is reduced to some extent. The surface area of the electrode material is increased, with a subsequent increase of metal-ion intercalation and/or adsorption in the electrode.…”

mentioning

confidence: 99%

Green Fluorination of Natural Graphite and its Application in Rechargeable Magnesium Ion Transfer Battery

Rani

Rushi

Kanakaiah

et al. 2011

J. Electrochem. Soc.

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For the first time, natural graphite is successfully fluorinated electrochemically using triethylamine tri(hydrofluoride) (C 2 H 5 ) 3 N.3HF adduct. The nature of the C-F bond formed in graphite fluoride is deduced from FT-IR, Raman and XPS spectroscopy. Electrochemical discharge of the semi-ionic fluorinated graphite as cathode in magnesium cell is investigated and the discharge capacity of the C-F electrode is found to be 548 mAh/g. Graphite-fluorine cathode prepared by this procedure showed rechargeable nature in combination with magnesium anode. Fluorine based materials have a prominent place in energy storage and conversion systems. Its use stems from the intrinsic stability and ability to generate high electrochemical energy as electrodes. These attributes are direct result of the extraordinary electro negativity of fluorine and exceptionally high free energy of formation of fluorides.The surface modification or fluorination of graphite 1-3 has been assumed to yield important electrode modifications by Tressaud et al.,4 i.e., Surface oxygen is reduced to some extent. The surface area of the electrode material is increased, with a subsequent increase of metal-ion intercalation and/or adsorption in the electrode. This latter property may be due to two factors: (i) an increase in the structural disorder caused by fluorination which probably diminishes the length of the graphitic domains and induces the formation of surface nanopores in which excess metal can be accommodated.Graphite fluorides have been studied as cathode materials in lithium 5-8 or aluminum batteries 9 Nakajima et al. 10 had shown that a low fluorination of graphite can improve the capacitance of C-F in Li battery system during the insertion into the resulting materials in comparison with graphite. As a matter of fact the treated graphite samples, which contain small amounts of fluorine (0.5-3.7 atom %), exhibit discharge capacities of about 380 mAh/g. Giraudet et al. 11 had reported the preparation method of semi-ionic graphite fluoride material and used in lithium battery system, which showed a capacitance value of 530 mAh/g. Rechargeable metal-ion batteries are well adapted for portable electronic devices, research in this field mostly concerns lithium intercalation batteries. These batteries have two major limitations, cost of the battery and their environmental impact. Magnesium is an appropriate alternative for lithium, because it is less harmful and naturally more abundant than lithium.Preliminary work on Mg/graphite fluoride system 12 showed that graphite fluorides could be an interesting cathode for magnesium ion-transfer batteries, 13-17 the graphite fluoride used was prepared from iodine fluoride, hydrogen fluoride and fluorine gas. The nature of C-F bond in the graphite fluoride prepared by this method was covalent. One of reasons for poor efficiency of the system was difficult diffusion of Mg 2þ into the graphite fluoride material due to hindering of the IF z species in the material.Fluorine-graphite intercalation compounds...

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Modification of surface properties of carbon-based and polymeric materials through fluorination routes: From fundamental research to industrial applications

Cited by 177 publications

References 49 publications

Influence of oxyfluorination on activated carbon nanofibers for CO₂storage

Influence of oxyfluorination on activated carbon nanofibers for CO₂storage

A New Esterase from Thermobifida halotolerans Hydrolyses Polyethylene Terephthalate (PET) and Polylactic Acid (PLA)

Green Fluorination of Natural Graphite and its Application in Rechargeable Magnesium Ion Transfer Battery

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Modification of surface properties of carbon-based and polymeric materials through fluorination routes: From fundamental research to industrial applications

Cited by 177 publications

References 49 publications

Influence of oxyfluorination on activated carbon nanofibers for CO2storage

Influence of oxyfluorination on activated carbon nanofibers for CO2storage

A New Esterase from Thermobifida halotolerans Hydrolyses Polyethylene Terephthalate (PET) and Polylactic Acid (PLA)

Green Fluorination of Natural Graphite and its Application in Rechargeable Magnesium Ion Transfer Battery

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Influence of oxyfluorination on activated carbon nanofibers for CO₂storage

Influence of oxyfluorination on activated carbon nanofibers for CO₂storage