Influence of fluorination on the properties of carbon fibres

Bismarck, Alexander; Tahhan, Ralf; Springer, Jürgen; Schulz, Axel; Klapötke, Thomas M.; Zeil, H.; Michaeli, Walter

doi:10.1016/s0022-1139(97)00029-8

Cited by 116 publications

(75 citation statements)

References 18 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

Carbon letters

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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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“…3b), specific peaks were observed at 284.3, 286.4, 287.9, and 286.9 eV, corresponding to C-C, C-O, O-C=O, and C=O, respectively (Bismarck et al 1997). After reduction, the intensity of the peaks corresponding to O-C=O and C=O species clearly decreased, as shown in Fig.…”

Section: Materials Characterization and Analysismentioning

confidence: 82%

Graphene/Hemin Hybrid Material as a Catalyst for Degradation of Alkaline Lignin with Hydrogen Peroxide

Chen

Yan

2017

BioResources

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A graphene/hemin (H-GN) catalyst for lignin degradation was prepared by a wetchemistry method with graphene oxide and hemin. Hemin was absorbed onto the graphene surface through π-π interaction. Graphene served as a supporting material for hemin, providing a large contact area between the active molecules of catalyst and substrate, as well as protecting hemin from self-oxidation and maintaining its active molecules. The H-GN catalyst showed high catalytic efficiency in the degradation of alkaline lignin under gentle conditions. At pH 13.0, the degradation rate was 49.7% with H-GN and H2O2 (mass ratio of H2O2 to lignin of 10:1) under 60 °C, which was higher than 34.9% for non-catalyst degradation. At pH 13.2, it was as high as 92.9 wt.% at 100 °C. The lignin was decomposed into small molecules with styrene as the main final product below pH 13 and with the major products of 4-hydroxy-4-methyl-2-pentanone and bis(2-ethylhexyl) phthalate at pH 13.2.

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“…The decrease in the dispersive component (γS L ) of the surface free energy may be caused by the destruction of the graphitic character of the CB surface due to fluorination. 27 The γS L values are usually assumed to be fairly independent of the method of surface modification of the carbon materials. 28 It is assumed that the specific component (γS SP ) reflects the essential surface characteristics of carbon or the partial graphitized carbon framework of the particles.…”

Section: Resultsmentioning

confidence: 99%

Effect of Fluorination on Electrical Behaviors of Carbon Blacks-filled HDPE Polymeric Switch

Seo¹,

Park

2009

Bulletin of the Korean Chemical Society

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Electrical properties of a fluorinated carbon black (CB)-filled high-density polyethylene (HDPE) polymeric switch were investigated as a function of fluorination pressure at 0.1 ~ 0.4 MPa. From the FT-IR results, the absorption spectra of the fluorinated CB show an absorption band at 1400 ~ 1000 cm -1 for νC-F and the peak intensity increased with increasing fluorination pressure. Also, the analysis of XPS spectra of the fluorinated CB indicated that fluorine content increased with increasing fluorination pressure. Meanwhile, the surface free energy of the fluorinated CB decreased with increasing fluorination pressure. Consequently, the increase of fluorine contents of CB made a disappearance of negative temperature coefficient (NTC) behavior of the polymeric switch, which was probably due to the reduction of CB reaggregation after melting point of the HDPE, resulted from the decreasing of London dispersive component of the surface free energy for CB particles.

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Influence of fluorination on the properties of carbon fibres

Cited by 116 publications

References 18 publications

Influence of oxyfluorination on activated carbon nanofibers for CO₂storage

Influence of oxyfluorination on activated carbon nanofibers for CO₂storage

Graphene/Hemin Hybrid Material as a Catalyst for Degradation of Alkaline Lignin with Hydrogen Peroxide

Effect of Fluorination on Electrical Behaviors of Carbon Blacks-filled HDPE Polymeric Switch

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Influence of fluorination on the properties of carbon fibres

Cited by 116 publications

References 18 publications

Influence of oxyfluorination on activated carbon nanofibers for CO2storage

Influence of oxyfluorination on activated carbon nanofibers for CO2storage

Graphene/Hemin Hybrid Material as a Catalyst for Degradation of Alkaline Lignin with Hydrogen Peroxide

Effect of Fluorination on Electrical Behaviors of Carbon Blacks-filled HDPE Polymeric Switch

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Influence of oxyfluorination on activated carbon nanofibers for CO₂storage

Influence of oxyfluorination on activated carbon nanofibers for CO₂storage