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Article: Monodisperse magnetite nanofluids: Synthesis, aggregation, and thermal conductivity

TitleMonodisperse magnetite nanofluids: Synthesis, aggregation, and thermal conductivity
Authors
Issue Date2010
PublisherAmerican Institute of Physics. The Journal's web site is located at http://jap.aip.org/jap/staff.jsp
Citation
Journal Of Applied Physics, 2010, v. 108 n. 11 How to Cite?
AbstractMagnetic nanofluids possess some unique properties that can significantly affect their thermal conductivity. We synthesize monodispersed magnetite (Fe 3 O 4) nanofluids in toluene with the particle size from 4 to 12 nm and obtain aqueous nanofluids by a simple "one-step" phase transfer. Even without the effect of external field, the magnetic-interaction- induced self-assembled aggregation can still be significant in magnetite nanofluids. Investigation of the microstructures of self-assembled aggregation is carried out by the dynamic light scattering, which unveils the variation of aggregated configurations with particle concentration and time. Based on the calculation from the existing models, the aggregates decrease the thermal conductivity of both themselves and the entire system, mainly due to the less solid contents and weaker mobility compared with the single particles as well as the increase in interfacial thermal resistance. As the manifestation of the aggregation-structure variation, the measured thermal conductivity is of a wavelike shape as a function of particle concentration. The particle coating layers are also of importance in cluster formation so that nanofluid thermal conductivity can be manipulated for some nanofluids by changing the stabilizer used and thus controlling the particle aggregated structures. Due to the effects of temperature, viscosity and coating layers, the thermal conductivity for aqueous system varies in a different way as that for the toluene system. © 2010 American Institute of Physics.
Persistent Identifierhttp://hdl.handle.net/10722/157103
ISSN
2015 Impact Factor: 2.101
2015 SCImago Journal Rankings: 0.603
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong KongGRF718009
GRF717508
Funding Information:

The financial support from the Research Grants Council of Hong Kong (Grant Nos. GRF718009 and GRF717508) is gratefully acknowledged. A part of this work has been discussed with Dr. Y. X. Zhang from whom some constructive suggestions are obtained.

References

 

DC FieldValueLanguage
dc.contributor.authorJiang, Wen_US
dc.contributor.authorWang, Len_US
dc.date.accessioned2012-08-08T08:45:20Z-
dc.date.available2012-08-08T08:45:20Z-
dc.date.issued2010en_US
dc.identifier.citationJournal Of Applied Physics, 2010, v. 108 n. 11en_US
dc.identifier.issn0021-8979en_US
dc.identifier.urihttp://hdl.handle.net/10722/157103-
dc.description.abstractMagnetic nanofluids possess some unique properties that can significantly affect their thermal conductivity. We synthesize monodispersed magnetite (Fe 3 O 4) nanofluids in toluene with the particle size from 4 to 12 nm and obtain aqueous nanofluids by a simple "one-step" phase transfer. Even without the effect of external field, the magnetic-interaction- induced self-assembled aggregation can still be significant in magnetite nanofluids. Investigation of the microstructures of self-assembled aggregation is carried out by the dynamic light scattering, which unveils the variation of aggregated configurations with particle concentration and time. Based on the calculation from the existing models, the aggregates decrease the thermal conductivity of both themselves and the entire system, mainly due to the less solid contents and weaker mobility compared with the single particles as well as the increase in interfacial thermal resistance. As the manifestation of the aggregation-structure variation, the measured thermal conductivity is of a wavelike shape as a function of particle concentration. The particle coating layers are also of importance in cluster formation so that nanofluid thermal conductivity can be manipulated for some nanofluids by changing the stabilizer used and thus controlling the particle aggregated structures. Due to the effects of temperature, viscosity and coating layers, the thermal conductivity for aqueous system varies in a different way as that for the toluene system. © 2010 American Institute of Physics.en_US
dc.languageengen_US
dc.publisherAmerican Institute of Physics. The Journal's web site is located at http://jap.aip.org/jap/staff.jspen_US
dc.relation.ispartofJournal of Applied Physicsen_US
dc.titleMonodisperse magnetite nanofluids: Synthesis, aggregation, and thermal conductivityen_US
dc.typeArticleen_US
dc.identifier.emailWang, L:lqwang@hkucc.hku.hken_US
dc.identifier.authorityWang, L=rp00184en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1063/1.3518045en_US
dc.identifier.scopuseid_2-s2.0-78751516914en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78751516914&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume108en_US
dc.identifier.issue11en_US
dc.identifier.eissn1089-7550-
dc.identifier.isiWOS:000285474100118-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridJiang, W=36079060300en_US
dc.identifier.scopusauthoridWang, L=35235288500en_US

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