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Issue 22, 2018
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Extraordinary water adsorption characteristics of graphene oxide

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Abstract

The laminated structure of graphene oxide (GO) confers unique interactions with water molecules which may be utilised in a range of applications that require materials with tuneable hygroscopic properties. The precise role of the expandable interlayer spacing and functional groups in GO laminates has not completely been understood to date. Herein, we report the experimental and theoretical investigations on the adsorption and desorption behaviour of water in GO laminates as a function of relative pressure. We observed that GO imparts high water uptake capacity of up to 0.58 gram of water per gram of GO (g gāˆ’1), which is significantly higher than silica gel as a conventional desiccant material. More interestingly, the adsorption and desorption kinetics of GO is five times higher than silica gel. The observed extraordinary adsorption/desorption rate can be attributed to the high capillary pressure in GO laminates as well as micro meter sized tunnel-like wrinkles located at the surface.

Graphical abstract: Extraordinary water adsorption characteristics of graphene oxide

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Publication details

The article was received on 02 Feb 2018, accepted on 16 May 2018 and first published on 16 May 2018


Article type: Edge Article
DOI: 10.1039/C8SC00545A
Citation: Chem. Sci., 2018,9, 5106-5111
  • Open access: Creative Commons BY license
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    Extraordinary water adsorption characteristics of graphene oxide

    B. Lian, S. De Luca, Y. You, S. Alwarappan, M. Yoshimura, V. Sahajwalla, S. C. Smith, G. Leslie and R. K. Joshi, Chem. Sci., 2018, 9, 5106
    DOI: 10.1039/C8SC00545A

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