Magnetic graphite suspensions with reversible thermal conductivity

被引：12
|
作者：
Sun, P. C. [1 ,2 ]
Huang, Y. [1 ]
Zheng, R. T. [2 ]
Cheng, G. A. [2 ]
Wan, Q. M. [1 ]
Ding, Y. L. [3 ]
机构：
[1] Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
[2] Beijing Normal Univ, Key Lab Radiat Beam Technol & Mat Modificat, Minist Educ, Beijing 100875, Peoples R China
[3] Univ Birmingham, Sch Chem Engn, Birmingham B15 2TT, W Midlands, England
来源：
MATERIALS LETTERS | 2015年 / 149卷
基金：
中国博士后科学基金;
关键词：
Magnetic graphite nanoflakes; Suspensions; Thermal conductivity; Reversible; Magnetic field; TRANSPORT; GRAPHENE;
D O I：
10.1016/j.matlet.2015.02.104
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Magnetic graphite nanofiake (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 riiaterials with magnetically reversible TC have great potential in next generation "smart" cooling devices. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：92 / 94
页数：3
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