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Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions
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Graphene size control via a mechanochemical method and electroresponsive properties
Keun-Young Shin1, Seungae Lee, Seunghee Hong
1World Class University (WCU) Program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, Seoul National University , 599 Gwanangno, Gwanakgu, Seoul 151-742, Korea.
ACS Applied Materials & Interfaces
|March 27, 2014
Summary
Mechanochemical processing created highly dispersible graphene oxide (GO) for electrorheological (ER) fluids. Ball-milled GO demonstrated superior ER performance and faster response times compared to non-milled GO.
Area of Science:
- Materials Science
- Nanotechnology
- Colloid and Surface Chemistry
Background:
- Graphene oxide (GO) is a promising material due to its unique properties.
- Developing scalable methods for GO fabrication with controlled characteristics is crucial for its applications.
- Electrorheological (ER) fluids require materials with specific properties like small particle size and good dispersibility.
Purpose of the Study:
- To fabricate highly dispersible graphene oxide (GO) sheets using a mechanochemical process.
- To investigate the electrorheological properties of ball-milled GO in silicone oil.
- To optimize GO characteristics for enhanced ER fluid performance.
Main Methods:
- Pristine graphite was processed using a mechanochemical ball-milling technique.
- The morphology and density of GO were analyzed after ball-milling.
- Electrorheological performance was evaluated using ball-milled GO dispersed in silicone oil.
Main Results:
- Uniform submicrometer GO sheets with spherical morphology and reduced density were successfully produced.
- The 2-h ball-milled GO-based ER fluid exhibited optimal performance, with shear stress of 78.5 Pa and 630% ER efficiency, doubling that of non-milled GO.
- ER fluid response and recovery times decreased with increased ball-milling time, and antisedimentation properties were improved.
Conclusions:
- Mechanochemical processing offers a scalable route to high-quality graphene oxide for advanced materials.
- Ball-milled GO significantly enhances electrorheological fluid performance and stability.
- Controlling graphene sheet size via mechanochemical methods is key for commercialization.
