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Updated: Jan 30, 2026
14:24
Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration
Published on: March 12, 2014
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Microfluidics-enabled orientation and microstructure control of macroscopic graphene fibres
Guoqing Xin1, Weiguang Zhu1, Yanxiang Deng1
1Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA.
Nature Nanotechnology
|January 16, 2019
Summary
Researchers developed a microfluidic method to precisely control graphene sheet alignment in macroscopic structures. This technique enhances thermal, electrical, and mechanical properties for advanced material applications.
Area of Science:
- Materials Science
- Nanotechnology
- Fluid Dynamics
Background:
- Macroscopic graphene structures (papers, fibers) are made from graphene oxide sheets using fluidics.
- Current methods face challenges in optimizing microstructure for high thermal-mechanical and electrical properties.
Purpose of the Study:
- To achieve tunable graphene sheet alignment and orientation in macroscopic structures.
- To enhance the thermal, electrical, and mechanical properties of graphene materials.
Main Methods:
- Utilizing microfluidic design for precise control over size, geometry, and flow patterns.
- Employing thin flat channels for sheet stacking and anisotropic microchannel walls for shear stress distribution.
- Creating elongational and step expansion flows to control sheet alignment.
Main Results:
- Fabricated macroscopic graphene structures with perfectly stacked sheets exhibiting superior thermal and electrical conductivities and improved mechanical strength.
- Demonstrated tunable graphene sheet alignment (horizontal, perpendicular) by controlling flow conditions.
- Observed shape and size confinements attributed to shear stress distribution and shear thinning effects.
Conclusions:
- Microfluidic design offers effective control over graphene sheet alignment and macroscopic structure fabrication.
- Optimized alignment significantly enhances the functional properties of graphene-based materials.
- The developed method enables the production of large-scale graphene tubes and rods with tailored properties.
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