Water can stably disperse liquid-exfoliated graphene.

@article{Yi2013WaterCS,
  title={Water can stably disperse liquid-exfoliated graphene.},
  author={Min Yi and Zhi-gang Shen and Shuaishuai Liang and Lei Liu and Xiaojing Zhang and Shu-lin Ma},
  journal={Chemical communications},
  year={2013},
  volume={49 94},
  pages={
          11059-61
        }
}
Liquid-exfoliated graphene can be stably dispersed in water and concurrently maintain its high quality (average 1 nm thick, low content of defects and oxides). The high stability is attributed to the reduction of flake size and thus the enhanced edge effects. This work opens up a whole new vista on how to disperse graphene. 
Direct exfoliation of graphite in water with addition of ammonia solution.
Liquid-Phase Exfoliation of Graphene: An Overview on Exfoliation Media, Techniques, and Challenges
TLDR
This systematic exploratory study of LPE will potentially pave the way for the scalable production of graphene, which can be also applied to produce other 2D layered materials, such as BN, MoS2, WS2, etc.
Surfactant-Free Stabilization of Aqueous Graphene Dispersions Using Starch as a Dispersing Agent
TLDR
It is demonstrated that starch can disperse graphene with a low oxygen content in water and the aqueous starch–graphene dispersion provides tremendous opportunities for environmental-friendly packaging applications.
A green, rapid and size-controlled production of high-quality graphene sheets by hydrodynamic forces
Based on a hydrodynamic mechanism, a novel, scalable and rapid production of relatively defect-free graphene nanosheets (GNSs) by a high shear mixer is proposed in this paper. The synergistic
Uniform Functionalization of High-Quality Graphene with Platinum Nanoparticles for Electrocatalytic Water Reduction
TLDR
The synthesis of a composite material comprised of monodispersed platinum nanoparticles on high-quality graphene obtained by using two different exfoliation techniques is reported, providing a new outlook on the design of novel materials for the development of robust and scalable water-splitting devices.
Exfoliation Behavior of Large Anionic Graphite Flakes in Liquid Produced by Salt-Assisted Ball Milling
Functionalization of graphite is crucial for efficient and effective exfoliation to graphene. When negative charges are fixed to the edges of natural graphite, the resulting anionic graphite shows
Ultrasonic exfoliation of graphene in water: A key parameter study
...
...

References

SHOWING 1-10 OF 21 REFERENCES
Stable aqueous dispersions of graphitic nanoplatelets via the reduction of exfoliated graphite oxide in the presence of poly(sodium 4-styrenesulfonate)
For the first time, stable aqueous dispersions of polymer-coated graphitic nanoplatelets can be prepared via an exfoliation/in-situ reduction of graphite oxide in the presence of poly(sodium
Processable aqueous dispersions of graphene nanosheets.
TLDR
It is reported that chemically converted graphene sheets obtained from graphite can readily form stable aqueous colloids through electrostatic stabilization, making it possible to process graphene materials using low-cost solution processing techniques, opening up enormous opportunities to use this unique carbon nanostructure for many technological applications.
Solution-processable graphene nanomeshes with controlled pore structures
TLDR
A method by refluxing reduced graphene oxide sheets in concentrated nitric acid solution increased the specific surface areas of GNMs and the transmittances of GNM-based thin films, leading to good dispersibility in aqueous media and strong peroxidase-like catalytic activity.
Liquid exfoliation of defect-free graphene.
  • J. Coleman
  • Chemistry, Materials Science
    Accounts of chemical research
  • 2013
TLDR
This Account describes recent work to develop such a processing route inspired by previous theoretical and experimental studies on the solvent dispersion of carbon nanotubes, and extends this process to exfoliate other layered compounds such as BN and MoS(2).
Edge-carboxylated graphene nanosheets via ball milling
TLDR
Ball milling can provide simple, but efficient and versatile, and eco-friendly (CO2-capturing) approaches to low-cost mass production of high-quality GNs for applications where GOs have been exploited and beyond.
Liquid phase production of graphene by exfoliation of graphite in surfactant/water solutions.
TLDR
A method to disperse and exfoliate graphite to give graphene suspended in water-surfactant solutions and suggests the flakes to be largely free of defects and oxides, although X-ray photoelectron spectroscopy shows evidence of a small oxide population.
Preparation of graphene by exfoliation of graphite using wet ball milling
Wet ball milling was used to exfoliate graphite platelets into graphenes in a liquid medium. Multi-layered graphite nanosheets with a thickness of 30 to 80 nm were dispersed into
High-yield production of graphene by liquid-phase exfoliation of graphite.
TLDR
Graphene dispersions with concentrations up to approximately 0.01 mg ml(-1), produced by dispersion and exfoliation of graphite in organic solvents such as N-methyl-pyrrolidone are demonstrated.
Efficient inkjet printing of graphene.
An efficient and mature inkjet printing technology is introduced for mass production of coffee-ring-free patterns of high-quality graphene at high resolution (unmarked scale bars are 100 μm).
Measurement of multicomponent solubility parameters for graphene facilitates solvent discovery.
TLDR
The dispersibility of graphene is measured in 40 solvents, with 28 of them previously unreported, and transmission electron microscopy analysis is used to show that the graphene is well exfoliated in all cases.
...
...