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Related Experiment Video

Updated: Jun 1, 2026

Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions
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Published on: July 17, 2019

Solvent-exfoliated graphene at extremely high concentration.

Umar Khan1, Harshit Porwal, Arlene O'Neill

  • 1School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 17, 2011
PubMed
Summary

Researchers developed three methods to disperse graphene in solvents, achieving concentrations up to 63 mg/mL. Optimized techniques yield stable, few-layer graphene dispersions suitable for various applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Graphene, a single layer of carbon atoms, possesses exceptional properties.
  • Efficient dispersion of graphene in solvents is crucial for its practical applications.
  • Existing methods often yield low concentrations or unstable dispersions.

Purpose of the Study:

  • To develop and optimize methods for high-concentration graphene dispersion.
  • To characterize the properties of the dispersed graphene flakes.
  • To assess the stability of the graphene dispersions.

Main Methods:

  • Sonication of graphite in N-methyl-2-pyrrolidinone (NMP).
  • Centrifugation to remove unexfoliated graphite.
  • Filtration to obtain exfoliated few-layer graphene powder.

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  • Redispersion of graphene powder in solvents.

    • Main Results:

    • Achieved graphene dispersions with concentrations ranging from 2 to 63 mg/mL.
    • Identified three distinct dispersion methods with varying concentrations.
    • Characterized dispersed flakes as approximately 1 μm long and 3-4 layers thick.
    • Demonstrated indefinite stability of approximately 26-28 mg/mL of the dispersed graphene.

    Conclusions:

    • Developed scalable methods for producing high-concentration graphene dispersions.
    • Optimized process yields few-layer graphene with controlled flake size.
    • High-concentration, stable graphene dispersions are achievable, enabling broader applications.