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Updated: Sep 9, 2025
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Characterization of Thermal Transport in One-dimensional Solid Materials
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A Study on Thermal Conductivity Enhancement in Composites Utilizing Excluded Volume Effects
Elad Koronio1, Gal Shachar-Michaely2, Oren Regev2,3
1Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105, Israel.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 3, 2025
Summary
Adding high-volume fillers to composites can enhance thermal conductivity by increasing the concentration of conductive fillers. This excluded volume effect requires over 20% conductive filler loading for significant improvements in thermal management applications.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Science
Background:
- Improving thermal conductivity in polymer composites is crucial for thermal management.
- High loadings of conductive fillers like graphene nanoplatelets enhance composite conductivity via percolation.
- The excluded volume approach uses inert fillers to increase conductive filler concentration and potentially lower percolation thresholds.
Purpose of the Study:
- To investigate the excluded volume effect on enhancing thermal conductivity in composites.
- To determine the conditions and filler loadings required for significant conductivity improvements.
- To validate numerical modeling with experimental data.
Main Methods:
- A two-dimensional numerical analysis was employed.
- A thermally inert high-volume filler was used to isolate its compacting effect.
- The model focused on graphene nanoplatelets as the highly conductive filler in a polymer matrix.
Main Results:
- Significant thermal conductivity enhancements require over 20% volume loading of the highly conductive filler.
- The numerical analysis showed good correlation with experimental results.
- Predicted enhancements of up to 20% were observed due to the addition of the high-volume filler.
Conclusions:
- The excluded volume effect can optimize composite thermal conductivity through controlled filler addition.
- Achieving substantial benefits requires careful consideration of filler loadings and interactions.
- This approach offers a pathway for designing advanced thermal management materials.
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