Journal
NANO LETTERS
Volume 12, Issue 1, Pages 188-192Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl203276y
Keywords
Thermal; percolation; graphite; suspension
Categories
Funding
- MIT-Ford Alliance
- NSF [CBET-0755825]
- AFOSR [FA9550-11-1-0174]
- China Scholarship Council
- Fundamental Research Funds for the Central Universities
- Program for New Century Excellent Talents in University (NCET)
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Different from the electrical conductivity of conductive composites, the thermal conductivity usually does not have distinctive percolation characteristics. Here we report that graphite suspensions show distinct behavior in the thermal conductivity at the electrical percolation threshold, including a sharp kink at the percolation threshold, below which thermal conductivity increases rapidly while above which the rate of increase is smaller, contrary to the electrical percolation behavior. Based on microstructural and alternating current impedance spectroscopy studies, we interpret this behavior as a result of the change of interaction forces between graphite flakes when isolated clusters of graphite flakes form percolated structures. Our results shed light on the thermal conductivity enhancement mechanisms in nanofluids and have potential applications in energy systems.
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