Magnetic graphite suspensions with reversible thermal conductivity

P.c. Sun, Y. Huang, R.t. Zheng, G.a. Cheng, Q.m. Wan, Yulong Ding

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
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Abstract

Magnetic graphite nanoflake (GN) suspensions with reversible thermal conductivity (TC) are reported. A process of sulfuric acid intercalation, microwave expansion magnetization, and ultrasonic dispersion is followed to make magnetic GN Poly-Alpha-Olefin (PAO) suspensions. Magnetic field was observed to increase the TC of the suspensions dramatically, up to 325% with 0.8% (w/w) of magnetic GNs. After removing the magnetic field, the TC trends to decrease reversibly. The maximal TC contrast ratio reaches 3 times before and after the effects of magnetic field. Such materials with magnetically reversible TC have great potential in next generation “smart” cooling devices.
Original languageEnglish
Pages (from-to)92-94
JournalMaterials Letters
Volume149
Early online date27 Feb 2015
DOIs
Publication statusPublished - 15 Jun 2015

Keywords

  • Magnetic graphite nanoflakes
  • Suspensions
  • Thermal conductivity
  • Reversible
  • Magnetic field

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