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Related Experiment Video

Updated: Nov 19, 2025

Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions
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Trapped and Alone: Clay-Assisted Aqueous Graphene Dispersions.

Lucas Luciano Cullari1, Tom Masiach1, Sivan Peretz Damari1

  • 1Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel.

ACS Applied Materials & Interfaces
|February 2, 2021
PubMed
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Down the Dimensionality Lane: Thermal Conductivity Enhancement in Carbon-Based Liquid Dispersions.

ACS applied materials & interfaces·2022

A novel method uses sepiolite clay to disperse graphene in water at high concentrations, enhancing thermal conductivity for cooling applications. This approach overcomes aggregation issues without compromising graphene quality.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Colloid Science

Background:

  • Graphene dispersions in liquids can improve thermal transport properties.
  • Graphene sheets aggregate and precipitate in water due to strong van der Waals forces.
  • Conventional methods like surfactant adsorption or chemical modification have limitations (low concentration, small sheet size, increased defects).

Purpose of the Study:

  • To develop a new method for high-concentration graphene-water dispersions.
  • To enhance the thermal conductivity of graphene dispersions for cooling applications.
  • To overcome limitations of existing graphene dispersion techniques.

Main Methods:

  • Utilizing sepiolite, a fibrous clay mineral, to stabilize graphene dispersions in water.
Keywords:
dispersionexfoliationgraphenekinetically arrestnanofluidthermal conductivitytrapping

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  • Forming a kinetically arrested particle network with sepiolite to trap graphene sheets.
  • Characterizing the dispersion mechanism and properties of graphene-sepiolite-water mixtures.

    • Main Results:

    • Achieved high concentrations (approx. 1 wt %) of dispersed graphene sheets with large lateral size (approx. 4 μm).
    • Demonstrated effective trapping of graphene sheets within a sepiolite-formed particle network.
    • Observed a 26% enhancement in thermal conductivity compared to filler-free fluid for thermal management.

    Conclusions:

    • Sepiolite addition offers an effective strategy for high-concentration, high-quality graphene dispersions in water.
    • The kinetically arrested network mechanism successfully prevents graphene aggregation and precipitation.
    • These enhanced graphene dispersions show significant potential for advanced thermal management solutions.