Magnetic graphite suspensions with reversible thermal conductivity

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

doi:10.1016/j.matlet.2015.02.104

Magnetic graphite suspensions with reversible thermal conductivity

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

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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 language	English
Pages (from-to)	92-94
Journal	Materials Letters
Volume	149
Early online date	27 Feb 2015
DOIs	https://doi.org/10.1016/j.matlet.2015.02.104
Publication status	Published - 15 Jun 2015

Keywords

Magnetic graphite nanoflakes
Suspensions
Thermal conductivity
Reversible
Magnetic field

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10.1016/j.matlet.2015.02.104

Sun_et_al_Magnetic_graphite_suspensions_Materials_Letters_2015
NOTICE: this is the author’s version of a work that was accepted for publication. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published as P.C. Sun, Y. Huang, R.T. Zheng, G.A. Cheng, Q.M. Wan, Y.L. Ding, Magnetic graphite Suspensions with reversible thermal conductivity, Materials Letters, http://dx.doi.org/10.1016/j.matlet.2015.02.104
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title = "Magnetic graphite suspensions with reversible thermal conductivity",

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.",

keywords = "Magnetic graphite nanoflakes, Suspensions, Thermal conductivity, Reversible, Magnetic field",

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

year = "2015",

month = jun,

day = "15",

doi = "10.1016/j.matlet.2015.02.104",

language = "English",

volume = "149",

pages = "92--94",

journal = "Materials Letters",

issn = "0167-577X",

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T1 - Magnetic graphite suspensions with reversible thermal conductivity

AU - Sun, P.c.

AU - Huang, Y.

AU - Zheng, R.t.

AU - Cheng, G.a.

AU - Wan, Q.m.

AU - Ding, Yulong

PY - 2015/6/15

Y1 - 2015/6/15

N2 - 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.

AB - 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.

KW - Magnetic graphite nanoflakes

KW - Suspensions

KW - Thermal conductivity

KW - Reversible

KW - Magnetic field

U2 - 10.1016/j.matlet.2015.02.104

DO - 10.1016/j.matlet.2015.02.104

M3 - Article

SN - 0167-577X

VL - 149

SP - 92

EP - 94

JO - Materials Letters

JF - Materials Letters

ER -

Magnetic graphite suspensions with reversible thermal conductivity

Abstract

Keywords

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