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Graphite oxide swelling in molten sugar alcohols and their aqueous solutions
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.
Umeå University, Faculty of Science and Technology, Department of Physics.
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2018 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 140, p. 157-163Article in journal (Refereed) Published
Abstract [en]

Graphite oxides (GO) are intercalated rapidly by one to several layers of solvent when immersed in liquid but the GO solvates are typically unstable on air due to solvent evaporation. Here we study swelling of GO in solvents (sugar alcohols) with melting temperature point above ambient. Using in situ synchrotron radiation XRD experiments we demonstrated GO swelling in molten xylitol and sorbitol. The expanded GO structure intercalated with one layer of xylitol or sorbitol is preserved upon solidification of melt and cooling back to ambient conditions. The structure of solid solvates of GO with xylitol and sorbitol is based on non-covalent interaction and pristine GO can be recovered by washing in water. Intercalation of xylitol and sorbitol into GO structure in aqueous solutions yields similar but less ordered structure of GO/sugar alcohol solid solvates. Very similar inter-layer distance was observed for GO intercalated by sugar alcohols in melt and for GO immersed in sugar solutions. This result shows that sugar alcohols penetrate into GO inter-layer space without hydration shell forming 2D layers with orientation parallel to graphene oxide sheets. Therefore, hydration diameter of molecules should not be considered as decisive factor for permeation through graphene oxide inter-layers in multilayered membranes.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 140, p. 157-163
Keywords [en]
graphene, graphene oxide, swelling
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-151276DOI: 10.1016/j.carbon.2018.08.033ISI: 000450120200016OAI: oai:DiVA.org:umu-151276DiVA, id: diva2:1243971
Funder
EU, Horizon 2020Swedish Research CouncilÅForsk (Ångpanneföreningen's Foundation for Research and Development)The Kempe FoundationsAvailable from: 2018-08-31 Created: 2018-08-31 Last updated: 2018-12-20Bibliographically approved

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Klechikov, AlexeyYou, ShujieLackner, LukasSun, JinhuaIakunkov, ArtemRebrikova, AnastasiaTalyzin, Aleksandr V.

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Klechikov, AlexeyYou, ShujieLackner, LukasSun, JinhuaIakunkov, ArtemRebrikova, AnastasiaTalyzin, Aleksandr V.
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