XPS determination of oxygen‐containing functional groups on carbon‐fibre surfaces and the cleaning of these surfaces

Desimoni, E.; Casella, G. I.; Morone, A.; Salvi, Anna Maria

doi:10.1002/sia.740151011

Cited by 313 publications

(152 citation statements)

References 62 publications

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“…The small intensity difference is equally distributed between the species II-V. However, the component VI at 534.2 eV, which can be assigned to carboxylic acid functional groups [25,26] or chemisorbed water [14,[16][17][18][19][20] according to the literature, is abundant in slightly higher proportion in sample MC_1 in comparison to the sample MC_2 after the butanol treatment.…”

Section: Differences In Original Carbon Samplesmentioning

confidence: 88%

“…It is generally agreed to the discrimination of minimum two different oxygen species, the double bonded oxygen at lower binding energies (~531 eV) and the single bonded oxygen at higher binding energies (~533 eV) [15]. Additionally, a third species at higher binding energies is commonly considered in the fit, assigned to adsorbed water or oxygen [17,20,26,27,33] chemisorbed H2O [14,[16][17][18][19][20] [28] VII 535 gas phase H2O [14] For the present work we also tried to involve considerations on structural elements that are predetermined by the synthesis procedure. Based on the polymeric precursor of the mesoporous carbon a broad variety of oxygen functional groups is possible for the carbon samples.…”

Section: Differences In Original Carbon Samplesmentioning

confidence: 98%

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Reactivity of mesoporous carbon against water – An in-situ XPS study

Reiche¹,

Blume²,

Zhao³

et al. 2014

Carbon

121

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Functionalized mesoporous carbon catalysts can be used in the acid catalyzed dehydration of fructose to 5-hydroxymethyl furfural (HMF). However, strong deactivation can be observed after preconditioning of the material in the reaction solvent 2-butanol. Surface changes caused by the pretreatment have been studied by XPS. The comparison of the pristine sample and the pretreated carbon sample showed similar distribution of oxygen functional groups by ex-situ XPS, as well as similar behavior during heating in vacuum. However, the addition of water (0.1 mbar vapor pressure) and subsequent heating to 130°C exhibited prominent differences in the evolution of the O1s, as well as for the C1s spectra of the two samples. Changes in the surface termination and hydrophobicity of the materials are discussed under the aspect of possible reactions of surface functional groups with the alcoholic solvent and water.

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Section: Differences In Original Carbon Samplesmentioning

confidence: 88%

Section: Differences In Original Carbon Samplesmentioning

confidence: 98%

Reactivity of mesoporous carbon against water – An in-situ XPS study

Reiche¹,

Blume²,

Zhao³

et al. 2014

Carbon

121

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“…High resolution scans were performed on the C1s and O1s to identify the carbon and oxygen species present, the assignment and molar abundance of which are summarised in Table 7. A complicated envelope was produced for the C1s, and was deconvoluted into six components commonly assigned in the analysis of carbon materials to: (a) carbide, (b) graphitic carbon, (c) aliphatics, (d) hydroxyls/ethers, (d) carbonyls, and (f) carboxyls/esters [59][60][61][62][63][64]. The O1s spectra is less complicated, with only 2 components fitted (Table 7), assigned to: (a) C=O in carbonyl and carboxyl groups, and (b) singly bonded oxygen assigned to -O-or C-OH in hydroxyl and carboxylic functional groups [60,64].…”

Section: Chemical and Textural Propertiesmentioning

confidence: 99%

Influence of oxidation upon the CO2 capture performance of a phenolic-resin-derived carbon

Plaza¹,

Thurecht²,

Pevida³

et al. 2013

Fuel Processing Technology

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The effect of oxidation upon the CO 2 capture performance has been studied taking a phenolic resin carbon as the base material. Oxygen surface groups were introduced through liquid and gas phase oxidation treatments, using ammonium persulfate, nitric acid and air, respectively.The surface chemistry of the final carbon is strongly affected by the type of oxidation treatment: liquid phase oxidation introduces a greater amount of oxygen, mostly as carboxylic groups; these are absent in the gas phase oxidised sample that contains mainly ether and carbonyl functionalities. The porous texture of the samples is also affected by the oxidation treatment: through liquid phase oxidation the pore volume is somewhat reduced, while this is slightly developed by air treatment at 693 K. Despite the reduction in the porous volume and the acidic surface, liquid-phase oxidised samples present greater CO 2 adsorption capacity than the starting carbon due to Lewis acid-base interactions with the CO 2 molecule.Moreover: oxidised samples are easily regenerated, and observed heats of adsorption are † Corresponding Author: Tel : +34 985 119090; E-mail address: frubiera@incar.csic.es. (F. Rubiera) 2 typical from physisorption processes, which will facilitate the adsorbent regeneration in cyclic adsorption processes. Oxidation is therefore proposed as a plausible modification technique for developing easy-to-regenerate carbon adsorbents with enhanced CO 2 capture performance.

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“…The C 1s peaks of the PGA@MNPs were assigned to aromatic carbons (C-C, 284.72 eV), phenolic OH groups (C-O, 285.6 eV, alcohols/ ethers), carboxylic groups (O=C-O, 288.87 eV, carboxylic acids/esters) and carbonates (O=CO2, 290.58 eV), according to Nevskaia et al, 51 Desimoni et al 52 and Martin et al 53 The carbonate contamination of the original PGA@MNP (290.58 eV in Table 1 This is a PDF file of an unedited manuscript that has been accepted for publication. This result shows that some phenolic groups of GA become oxidized to carboxylates in the adsorbed state.…”

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confidence: 99%

Mechanism of in Situ Surface Polymerization of Gallic Acid in an Environmental-Inspired Preparation of Carboxylated Core–Shell Magnetite Nanoparticles

et al. 2014

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Corresponding authorsM. Szekeres (szekeres@chem.u-szeged.hu) and E. Tombácz (tombacz@chem.u-szeged.hu) Graphical abstract AbstractMagnetite nanoparticles (MNPs) with biocompatible coatings are good candidates for MRI (magnetic resonance imaging) contrasting, magnetic hyperthermia treatments and drug delivery systems. The spontaneous surface induced polymerization of dissolved organic matter on environmental mineral particles inspired us to prepare carboxylated core-shell MNPs by using a ubiquitous polyphenolic precursor. Through the adsorption and in-situ surface polymerization of gallic acid (GA), a polygallate (PGA) coating is formed on the nanoparticles (PGA@MNP) with possible antioxidant capacity. The Polygallate on magnetite nanoparticles Humic matter on clays 2This is a PDF file of an unedited manuscript that has been accepted for publication. Final edited form is published in Langmuir, 2014, 30:15451−15461. http://dx.doi.org/10.1021/la5038102 present work explores the mechanism of polymerization with the help of potentiometric acid-base titration, dynamic light scattering (for particle size and zeta potential determination), UV-Vis (UVvisible light spectroscopy), FTIR-ATR (Fourier-transformed infrared spectroscopy by attenuated total reflection) and XPS (X-ray photoelectron spectroscopy) techniques. We observed the formation of ester and ether linkages between gallate monomers both in solution and in the adsorbed state. Higher polymers were formed in the course of several weeks both on the surface of nanoparticles and in the dispersion medium. The ratio of the absorbances of PGA supernatants at 400 and 600 nm (i.e., the E4/E6 ratio commonly used to characterize the degree of polymerization of humic materials) was determined to be 4.3, similar to that of humic acids. Combined XPS, dynamic light scattering and FTIR-ATR results revealed that prior to polymerization, the GA monomers became oxidized to polycarboxylic acids due to ring opening while Fe 3+ ions reduced to Fe 2+ . Our published results on the colloidal and chemical stability of PGA@MNPs are referenced thoroughly in the present work. Detailed studies on biocompatibility, antioxidant property and biomedical applicability of the particles will be published.

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XPS determination of oxygen‐containing functional groups on carbon‐fibre surfaces and the cleaning of these surfaces

Cited by 313 publications

References 62 publications

Reactivity of mesoporous carbon against water – An in-situ XPS study

Reactivity of mesoporous carbon against water – An in-situ XPS study

Influence of oxidation upon the CO2 capture performance of a phenolic-resin-derived carbon

Mechanism of in Situ Surface Polymerization of Gallic Acid in an Environmental-Inspired Preparation of Carboxylated Core–Shell Magnetite Nanoparticles

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