Magnetic graphite suspensions with reversible thermal conductivity

Research output: Contribution to journalArticlepeer-review


  • P.c. Sun
  • R.t. Zheng
  • G.a. Cheng
  • Q.m. Wan

Colleges, School and Institutes


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
Early online date27 Feb 2015
Publication statusPublished - 15 Jun 2015


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