Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 168, Issue -, Pages 287-295Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2018.09.020
Keywords
Powder processing; Nano composites; Synergism; Thermal properties; Mechanical properties
Categories
Funding
- Guangzhou Science and Technology Project [201804010174]
- Guangdong Special Support Program Youth Top-notch Talent [2014TQ01C702]
- Natural Science Foundation of Guangdong Province, China [2015A030313798, 2016A030313161]
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With the rapid development of electronic device, thermal management material is currently in great demand. Therefore, to design material of efficient thermal management is of high significance. In this work, we report a green route that using only water exfoliate boron nitride (BN) powder and obtain hydroxylate boron nitride nanosheets (BNNS-OH) aqueous dispersion. The BNNS-OH as high thermally conductive nanofillers composited with cellulose nanofiber (CNF) is prepared a flexible film which has high thermal conductivity, superior mechanical properties and good thermal stability. In BNNS-OH/CNF film, BNNS-OH and CNF are stacked layer-by-layer to form a natural nacre structure, where CNF acted as the mortar filled in the interlayer space. The in-plane thermal conductivity of the 25 wt%BNNS-OH/CNF film is 22.67 W m(-1) K-1, corresponding to thermal boundary resistance is 3.26 x 10(-6) m(2) kW(-1) calculated by the Maxwell-Garnett effective medium theory (EMT) which is lower than that by previously reported methods. We demonstrate the potential usefulness of BNNS-OH/CNF film in electronic device-cooling application.
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