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Article: Thermal percolation in stable graphite suspensions

TitleThermal percolation in stable graphite suspensions
Authors
KeywordsThermal
Percolation
Graphite
Suspension
Issue Date2012
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/nanolett
Citation
Nano Letters, 2012, v. 12 n. 1, p. 188-192 How to Cite?
Abstract
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.
Persistent Identifierhttp://hdl.handle.net/10722/144762
ISSN
2013 Impact Factor: 12.940
ISI Accession Number ID
Funding AgencyGrant Number
MIT-Ford Alliance
NSFCBET-0755825
AFOSRFA9550-11-1-0174
China Scholarship Council
Fundamental Research Funds for the Central Universities
Program for New Century Excellent Talents in University (NCET)
Funding Information:

The authors thank Dr. Shuo Chen for help in HRTEM characterization and Professor Yang Shao-Horn and Mr. Ethan Crumlin for the help in the AC impedance spectroscopy studies. This work is supported in part by MIT-Ford Alliance (J.W.G.), NSF grant no. CBET-0755825 (R.T.Z.), and AFOSR grant no. FA9550-11-1-0174 (J.J.W). R.T.Z. and J.W.G. also gratefully acknowledges partial financial support from China Scholarship Council, Fundamental Research Funds for the Central Universities, and the Program for New Century Excellent Talents in University (NCET).

 

Author Affiliations
  1. Massachusetts Institute of Technology
  2. Beijing Normal University
  3. South China Normal University
  4. The University of Hong Kong
  5. Huazhong University of Science and Technology
  6. Ford Motor
DC FieldValueLanguage
dc.contributor.authorZheng, R-
dc.contributor.authorGao, J-
dc.contributor.authorWang, JJ-
dc.contributor.authorFeng, SP-
dc.contributor.authorOhtani, H-
dc.contributor.authorWang, JB-
dc.contributor.authorChen, G-
dc.date.accessioned2012-02-03T08:25:29Z-
dc.date.available2012-02-03T08:25:29Z-
dc.date.issued2012-
dc.identifier.citationNano Letters, 2012, v. 12 n. 1, p. 188-192-
dc.identifier.issn1530-6984-
dc.identifier.urihttp://hdl.handle.net/10722/144762-
dc.description.abstractDifferent 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.-
dc.languageeng-
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/nanolett-
dc.relation.ispartofNano Letters-
dc.subjectThermal-
dc.subjectPercolation-
dc.subjectGraphite-
dc.subjectSuspension-
dc.subject.meshGraphite - chemistry-
dc.subject.meshMaterials Testing-
dc.subject.meshNanostructures - chemistry - ultrastructure-
dc.subject.meshParticle Size-
dc.subject.meshSuspensions - chemistry-
dc.subject.meshTemperature-
dc.subject.meshThermal Conductivity-
dc.titleThermal percolation in stable graphite suspensionsen_US
dc.typeArticleen_US
dc.identifier.emailFeng, TSP: hpfeng@hku.hk-
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1021/nl203276y-
dc.identifier.pmid22145977-
dc.identifier.scopuseid_2-s2.0-84855814595-
dc.identifier.hkuros205054-
dc.identifier.volume12-
dc.identifier.issue1-
dc.identifier.spage188-
dc.identifier.epage192-
dc.identifier.eissn1530-6992-
dc.identifier.isiWOS:000298943100033-
dc.publisher.placeUnited States-
dc.customcontrol.immutablesml 130426-

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