Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 12, Pages 13167-13175Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c02696
Keywords
boron nitride nanosheets; hydroxyethyl cellulose; ball-milling exfoliation; mechanical strength; thermal conductivity
Funding
- Key Research and Development Program of Shaanxi Province of China [2021ZDLGY14-05]
- Natural Science Basic Research Program of Shaanxi Province, China [2020JQ-722]
- Key Research and Development Project of Zhejiang Province, China [2019C04008]
- Key Project of Shaanxi Provincial Department of Education, China [20JY002]
- Foundation of State Key Laboratory of Biobased Material and Green Papermaking, China [GZKF202004]
- Program of Xi'an Key Laboratory of High-Performance Fiber Paper-based Functional Materials, China [2019220114SYS016CG038]
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Bulk boron nitride was mechanically exfoliated into nanosheets using a ball-milling method with viscous hydroxyethyl cellulose solution as a medium, resulting in good dispersion and stability of the BNNS. The HEC/BNNS films, with high mechanical strength and thermal conductivity, have the potential to be used as thermal interface materials.
Boron nitride nanosheets (BNNS) exfoliated by physical or chemical methods frequently exhibit poor dispersity in common solvents due to incomplete exfoliation and a low degree of functionalization, which has severely impacted BNNS application performances as polymer and lubricant additives. In this work, we mechanically exfoliated the bulk boron nitride into nanosheets through a ball-milling method by adopting the viscous hydroxyethyl cellulose (HEC) solution as a medium. Because of the abundant hydroxyls and strong hydrogen bonding interactions with BNNS, the HEC can not only serve as an intercalator and a protective agent of the BNNS during ball milling but can also benefit the stable dispersion of the fabricated HEC/BNNS mixture in water. The HEC/BNNS aqueous dispersion obtained by directly pouring deionized water into the ball-milled product is easy to form a two-dimensional film via the solution-casting method. Because of the good exfoliation and dispersion of the BNNS in the HEC matrix, the HEC/BNNS films have high mechanical strength and thermal conductivity and have the potential to be used as thermal interface materials.
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