Interaction of graphite fresh surface with different gases and vapours

Zarifyanz, Yu.A.; Kiselev, V. F.; Lezhnev, N. N.; Nikitina, O. V.

doi:10.1016/0008-6223(67)90066-8

Cited by 67 publications

(17 citation statements)

References 2 publications

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“…It is assumed that the same surface groups form as are present in acidic surface oxides. Such surface groups are also formed when oxygen is chemisorbed on a graphite which had been extensively milled under argon [528].…”

Section: Surface Oxides On Carbonmentioning

confidence: 99%

Nature and Estimation of Functional Groups on Solid Surfaces

1983

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Section: Surface Oxides On Carbonmentioning

confidence: 99%

Nature and Estimation of Functional Groups on Solid Surfaces

1983

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“…2,3 The mechanism has not been elucidated, 25 but these literature findings hint at the formation of active radicals on the graphitic surface, during high temperature treatment, which later trap oxygen. On that basis, we have investigated the hypothesis that the thermally-activated carbons ought to bind covalently, not just oxygen, but a wide 30 variety of functional molecules, including polymerisable monomers.…”

Section: Introductionmentioning

confidence: 99%

A versatile, solvent-free methodology for the functionalisation of carbon nanotubes

et al. 2010

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High temperature activation of carbon nanotubes (CNTs) provides a new and highly versatile functionalisation strategy. The reaction allows the attachment of a wide variety of functio nal species onto the nanotube surface at grafting ratios between 1 -8 wt%, whilst maintaining the 10 intrinsic properties of the untreated materials. The underlying reaction mechanism has been established by quenching experiments and EPR studies. The distrib ution of the functionalised sites has been investigated at the microscopic scale using tagging reactions. The grafted products have been characterized by electron microscopy, thermal analysis (TGA), Raman spectroscopy, and inverse gas chromatography (IGC). The change in the CNT surface properties after grafting has 15 been quantified in terms of dispersive and specific surface energies, and altered dispersibilities in a broad range of solvents. It is possible to carry out the reaction using gas phase reagents, providing a clean, efficient, and scalable methodology, relevant to a diverse range of applications.

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“…The data of Puri (25) indicate that all the CO2 is removed from the carbon surface above 600°C. Zarif'yanz et al (4) showed that CO2 begins to "desorb" from graphite below 200°C and is completely removed at 600°C, whereas CO comes off between 300 ° and 800°C. Boehm (6) noted that evolution of gas is noted upon heating activated sugar char to 200°C; this is probably C02.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…In fact, it has been shown (2-5) that carbons activated in an atmosphere of pure C02, or in a vacuum, react with molecular oxygen at room temperature and below. Zarif'yanz et al (4) actually were able to demonstrate that oxygen is irreversibly "chemisorbed" on graphite wear dust at temperatures below --40°C. This irreversibly adsorbed oxygen is re-284 SURFACE OXIDES OF ACTIVATED CARBON 285 movable only as CO2 and CO at temperatures above 200°C (4).…”

Section: Inti~oductionmentioning

confidence: 98%