Graphene Arrested in Laponite–Water Colloidal Glass

Graphene production in water from graphite sources is an important technological route toward harvesting the unique properties of this material. Graphene forms thermodynamically unstable dispersions in water, limiting the use of this solvent due to aggregation. We show that graphene–water dispersion...

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Bibliographic Details
Published in:Langmuir 2012-02, Vol.28 (8), p.4009-4015
Main Authors: Alhassan, Saeed M, Qutubuddin, Syed, Schiraldi, David A
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
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Summary:Graphene production in water from graphite sources is an important technological route toward harvesting the unique properties of this material. Graphene forms thermodynamically unstable dispersions in water, limiting the use of this solvent due to aggregation. We show that graphene–water dispersions can be controlled kinetically to produce graphene by using laponite clay. Laponite exhibits rapid gelation kinetics when dispersed in water above its gelation concentration, allowing graphene aggregation to be halted after exfoliation in water at ambient conditions. The transparency of laponite colloidal glass and films is important in examining the extent of graphene exfoliation.
ISSN:0743-7463
1520-5827
DOI:10.1021/la204781e