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Phase transitions in graphite oxide solvates at temperatures near ambient
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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2012 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 3, no 7, 812-817 p.Article in journal (Refereed) Published
Abstract [en]

It is demonstrated that solvent-saturated graphite oxide can be considered to be solid solvate, and two phases with distinctly different solvent composition are found near room temperature. Phase transitions between these two solvated phases were observed using synchrotron powder X-ray diffraction and DSC for methanol, ethanol, acetone, and dimethylformamide (DMF) solvents. Solvate A, formed at room temperature, undergoes a reversible phase transition into expanded Solvate L at temperatures slightly below ambient due to insertion of one monolayer of solvent molecules between the GO planes. The phase transition is reversible upon heating, whereas the low-temperature expanded phase L can be quenched to room temperature for ethanol and DMF solvates.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2012. Vol. 3, no 7, 812-817 p.
Keyword [en]
graphite oxide, solvates, graphene, phase transitions
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-55023DOI: 10.1021/jz300162uISI: 000302336800003OAI: oai:DiVA.org:umu-55023DiVA: diva2:525703
Funder
Swedish Research Council, 621-2010-3732
Note

Open access

Available from: 2012-05-09 Created: 2012-05-07 Last updated: 2017-12-07Bibliographically approved

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You, ShujieLuzan, SerhiyYu, JunchunSundqvist, BertilTalyzin, Alexandr V
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