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Enhanced thermal diffusion in the vertical direction of flexible polyimide composite films with magnetically alignable h-BN platelets viaferrofluids hybridization
- Source :
- Journal of Materials Research and Technology; September-October 2022, Vol. 20 Issue: 1 p2921-2930, 10p
- Publication Year :
- 2022
-
Abstract
- A facile approach is proposed to improve the anisotropic heat conduction of polyimide composite films containing hexagonal boron nitride (h-BN), thermally conductive filler with high anisotropy, viasurface hybridization with ferrofluids as magnetic carrier source. The surfaces of the h-BNs were decorated with Fe3O4particles to control their alignment using magnetic field. The h-BNs with hydroxyl groups (f-BN) were mixed with ferrofluids and heated to 130 °C with stirring. A considerable amount of Fe3O4nanoparticles was attached to the surface of f-BNs, named mf-BNs. Flexible polyimide (PI) composite films were prepared by adding mf-BNs at 1–30 wt.% to investigate the anisotropic alignment of mf-BNs under magnetic field. The thru-plane thermal conductivity of the PI composite film with vertically aligned mf-BN of 30 wt.% is 6 times higher than that of the neat PI film, as increased from 0.212 to 1.246 W/m∙K. This result is attributed to the anisotropic h-BN particles coated with the magnetic fluid arranged within the PI matrix in the vertical direction by using a neodymium magnet with less than 150 mT. This can solve the thermal issues of next-generation electronics by speeding the vertical heat transfer, which can greatly contribute to the improvement of the device reliability.
Details
- Language :
- English
- ISSN :
- 22387854
- Volume :
- 20
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Journal of Materials Research and Technology
- Publication Type :
- Periodical
- Accession number :
- ejs61858344
- Full Text :
- https://doi.org/10.1016/j.jmrt.2022.08.058