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  1. Article ; Online: Noncovalent Functionalization of Graphene Nanoplatelets and Their Applications in Supercapacitors.

    Haridas, Haritha / Kader, Arsath Kose Abdul / Sellathurai, Andrew / Barz, Dominik P J / Kontopoulou, Marianna

    ACS applied materials & interfaces

    2024  Volume 16, Issue 13, Page(s) 16630–16640

    Abstract: We demonstrate a simple noncovalent functionalization technique, which involves graphite exfoliation and subsequent coating of the resulting graphene nanoplatelets (GNPs) with trimellitic anhydride (TMA), using a thermomechanical exfoliation process. TMA ...

    Abstract We demonstrate a simple noncovalent functionalization technique, which involves graphite exfoliation and subsequent coating of the resulting graphene nanoplatelets (GNPs) with trimellitic anhydride (TMA), using a thermomechanical exfoliation process. TMA adsorbs on the surface of the GNPs, resulting in a reduction of the specific surface area to 312 ± 9 m
    Language English
    Publishing date 2024-03-20
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.3c18174
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: High concentration graphene nanoplatelet dispersions in water stabilized by graphene oxide

    Mypati, Sreemannarayana / Sellathurai, Andrew / Kontopoulou, Marianna / Docoslis, Aristides / Barz, Dominik P.J

    Carbon. 2021 Apr. 15, v. 174

    2021  

    Abstract: The preparation of aqueous graphene nanoplatelet (GNP) dispersions is a challenging task due to their tendency to agglomerate. In contrast, graphene oxide (GO), an oxidized form of GNP, has amphiphilic characteristics which allow it to disperse in an ... ...

    Abstract The preparation of aqueous graphene nanoplatelet (GNP) dispersions is a challenging task due to their tendency to agglomerate. In contrast, graphene oxide (GO), an oxidized form of GNP, has amphiphilic characteristics which allow it to disperse in an aqueous milieu without the addition of a surfactant. Therefore, we utilize GO as a dispersing agent to prepare highly-concentrated aqueous GNP dispersions, which can be used for various applications. The nature of the dispersed phase is investigated by various material characterization methods. Furthermore, we measure the zeta potentials of the dispersed phased as well as the contact angles of dispersions on different substrates. The latter data are used in the extended Derjaguin–Landau–Verwey–Overbeek theory to gain insight into the interactions that determine dispersion stability. We find that the stability of such dispersions mainly depends on the pH value as well as the ratio of GO and GNP concentrations. The rheology of the dispersions is investigated and different nematic phases are identified. Finally, highly-concentrated dispersions are used for printing of graphene films on a flexible substrate. After reduction of the minor GO fraction, the films have a high conductivity of more than 4500 S m⁻¹.
    Keywords graphene ; graphene oxide ; nanocomposites ; oxidation ; pH ; rheology ; surfactants
    Language English
    Dates of publication 2021-0415
    Size p. 581-593.
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2020.12.068
    Database NAL-Catalogue (AGRICOLA)

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