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Issue 29, 2015
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Delamination of graphite oxide in a liquid upon cooling

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Graphite oxide (GO) in liquid acetonitrile undergoes a transition from an ordered phase around ambient temperature to a gel-like disordered phase at temperatures below 260 K, as demonstrated by in situ X-ray diffraction. The stacking order of GO layers is restored below the freezing point of acetonitrile (199 K). The reversible swelling transition between a stacked crystalline phase and an amorphous delaminated state observed upon cooling provides an unusual example of increased structural disorder at lower temperatures. The formation of the gel-like phase is attributed to the thermo-responsive conformational change of individual GO flakes induced by stronger solvation. Scanning force microscopy demonstrates that GO flakes deposited onto a solid substrate from acetonitrile dispersions at a temperature below 260 K exhibit corrugations and wrinkling which are not observed for the flakes deposited at ambient temperature. The thermo-responsive transition between the delaminated and stacked phases reported here can be used for sonication-free dispersion of graphene oxide, micro-container applications, or the preparation of new composite materials.

Graphical abstract: Delamination of graphite oxide in a liquid upon cooling

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The article was received on 20 Apr 2015, accepted on 15 Jun 2015 and first published on 17 Jun 2015

Article type: Paper
DOI: 10.1039/C5NR02564H
Nanoscale, 2015,7, 12625-12630

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    Delamination of graphite oxide in a liquid upon cooling

    A. V. Talyzin, A. Klechikov, M. Korobov, A. T. Rebrikova, N. V. Avramenko, M. F. Gholami, N. Severin and J. P. Rabe, Nanoscale, 2015, 7, 12625
    DOI: 10.1039/C5NR02564H

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