5 results match your criteria thermal-decomposition oxygen-functional

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Effect of long-term ageing on graphene oxide: structure and thermal decomposition.

R Soc Open Sci 2021 Dec 8;8(12):202309. Epub 2021 Dec 8.

Army Engineering University of People's Liberation Army, Shijiazhuang Campus, No. 97 Heping West Road of Shijiazhuang, Shijiazhuang, Hebei province 050003, People's Republic of China.

After long-term ageing, the structure of graphene oxide prepared by the modified Hummers method changed. Because of the desorption of oxygen-containing functional groups, the C/O ratio of graphene oxide increased from 1.96 to 2. Read More

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December 2021

Ultrafast H-selective nanoporous multilayer graphene membrane prepared by confined thermal annealing.

Chem Commun (Camb) 2021 Sep 9;57(70):8730-8733. Epub 2021 Aug 9.

Department of Chemical and Biomolecular Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul 120-749, Republic of Korea.

H selective dense pores are generated in a graphene oxide (GO) layer by thermal-decomposition of oxygen-functional groups under high pressure. The nanoporous GO membrane shows H/CO selectivity of 12.1 and H permeability of 10360 Barrer. Read More

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September 2021

Simple synthesis of nanosheets of rGO and nitrogenated rGO.

Beilstein J Nanotechnol 2020 7;11:68-75. Epub 2020 Jan 7.

New Chemistry Unit, International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore, 560064, India.

A green and facile approach has been developed for the large-scale synthesis of nanosheets of reduced graphene oxide (rGO) and nitrogenated reduced graphene oxide (N-rGO). This has been achieved by direct thermal decomposition of sucrose and glycine at 475 °C in ca. 7 minutes, respectively. Read More

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January 2020

Kinetics of the defunctionalization of oxidized few-layer graphene nanoflakes.

Phys Chem Chem Phys 2018 Oct 11;20(37):24117-24122. Epub 2018 Sep 11.

Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, Moscow, 119991, Russia.

Thermal defunctionalization of oxidized jellyfish-like few-layer graphene nanoflakes was studied under non-isothermal conditions by simultaneous thermal analysis. Activation energies for thermal decomposition of different oxygen functional groups were calculated by the Kissinger method and compared with those for oxidized carbon nanotubes. Oxygen content in graphene nanoflakes was found to significantly affect the decomposition activation energies of carboxylic and keto/hydroxy acids because of their acceptor properties and strong distortion of the graphene layers at the edges of the nanoflakes. Read More

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October 2018

Spectroscopic studies of dehydrogenation of ammonia borane in carbon cryogel.

J Phys Chem B 2007 Dec 4;111(51):14285-9. Epub 2007 Dec 4.

Materials Science and Engineering, University of Washington, 302 Roberts Hall, Box 352120, Seattle, Washington 98195, USA.

Ammonia borane (AB) is of great interest for storing hydrogen, an important issue in the growing field of hydrogen technology. The reaction pathways leading to the thermal decomposition of solid-state AB incorporated in carbon cryogels (CC) have been studied by spectroscopic methods. The time-dependent thermal decomposition was followed by in situ 11B nuclear magnetic resonance (NMR) and showed a significant increase in hydrogen release kinetics for AB in CC compared to neat AB. Read More

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December 2007
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