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The structure of graphene oxide membranes in liquid water, ethanol and water – ethanol mixtures
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Department of Physical Chemistry and Materials Science, University of Szeged, Szeged, Hungary.
2014 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 6, 272-281 p.Article in journal (Refereed) Published
Abstract [en]

The structure of graphene oxide (GO) membranes was studied in situ in liquid solvents using synchrotron radiation X-ray diffraction in a broad temperature interval. GO membranes are hydrated by water similarly to precursor graphite oxide powders but intercalation of alcohols is strongly hindered, which explains why the GO membranes are permeated by water and not by ethanol. Insertion of ethanol into the membrane structure is limited to only one monolayer in the whole studied temperature range, in contrast to precursor graphite oxide powders, which are intercalated with up to two ethanol monolayers (Brodie) and four ethanol monolayers (Hummers). As a result, GO membranes demonstrate the absence of “negative thermal expansion” and phase transitions connected to insertion/de-insertion of alcohols upon temperature variations reported earlier for graphite oxide powders. Therefore, GO membranes are a distinct type of material with unique solvation properties compared to parent graphite oxides even if they are composed of the same graphene oxide flakes.

Place, publisher, year, edition, pages
RSC Publishing, 2014. Vol. 6, 272-281 p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-82861DOI: 10.1039/c3nr04631aOAI: oai:DiVA.org:umu-82861DiVA: diva2:663574
Available from: 2013-11-12 Created: 2013-11-12 Last updated: 2017-12-06Bibliographically approved

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CiteExportLink to record
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