TY - JOUR
T1 - Thermal properties of single-walled carbon nanotube forests with various volume fractions
AU - Cha, Jin Hyeok
AU - Hasegawa, Kei
AU - Lee, Jeonyoon
AU - Stein, Itai Y.
AU - Miura, Asuka
AU - Noda, Suguru
AU - Shiomi, Junichiro
AU - Chiashi, Shohei
AU - Wardle, Brian L.
AU - Maruyama, Shigeo
N1 - Funding Information:
Part of this work was supported by: JSPS KAKENHI Grant Numbers JP18H05329, JP20H00220; JST, CREST Grant Number JPMJCR20B5, Japan; Airbus, ANSYS, Boeing, Embraer, Lockheed Martin, Saab AB, Saertex, and Teijin Carbon America through MIT's Nano-Engineered Composite aerospace STructures (NECST) Consortium.
Publisher Copyright:
© 2021
PY - 2021/6
Y1 - 2021/6
N2 - Needs of a material for thermal management in reduced-sized electronic devices drive single-walled carbon nanotubes (SWCNTs) to be one of the most promising candidates due to their excellent thermal properties. Many numerical and experimental studies have reported on understanding thermal properties of the SWCNT for thermal device applications. In the present study, thermal diffusivity and conductivity of SWCNT forests in the axial direction with various volume fractions of SWCNTs were measured by laser flash analysis technique and the same properties of an individual SWCNT were derived. The volume fraction was controlled up to 25 vol% by biaxial mechanical densification which maintains SWCNT alignment. While the thermal diffusivity of SWCNT forests was almost constant, it increased when the volume fraction was higher than 17 vol%, suggesting that some SWCNTs, which did not serve as a thermal path in the case of lower volume fraction, were connected with the other SWCNTs. Through the increase of inferred thermal conductivity equivalent to an individual SWCNT after 17 vol%, we also realized that the enhancement of volume fraction of SWCNT forest diminished thermal boundary resistance in good agreement with the tendency inferred from the reported numerical data.
AB - Needs of a material for thermal management in reduced-sized electronic devices drive single-walled carbon nanotubes (SWCNTs) to be one of the most promising candidates due to their excellent thermal properties. Many numerical and experimental studies have reported on understanding thermal properties of the SWCNT for thermal device applications. In the present study, thermal diffusivity and conductivity of SWCNT forests in the axial direction with various volume fractions of SWCNTs were measured by laser flash analysis technique and the same properties of an individual SWCNT were derived. The volume fraction was controlled up to 25 vol% by biaxial mechanical densification which maintains SWCNT alignment. While the thermal diffusivity of SWCNT forests was almost constant, it increased when the volume fraction was higher than 17 vol%, suggesting that some SWCNTs, which did not serve as a thermal path in the case of lower volume fraction, were connected with the other SWCNTs. Through the increase of inferred thermal conductivity equivalent to an individual SWCNT after 17 vol%, we also realized that the enhancement of volume fraction of SWCNT forest diminished thermal boundary resistance in good agreement with the tendency inferred from the reported numerical data.
KW - Mechanical Densification
KW - Single-walled carbon nanotube
KW - Thermal conductivity
KW - Thermal diffusivity
KW - Vertically Aligned SWCNT
UR - http://www.scopus.com/inward/record.url?scp=85101382710&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85101382710&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2021.121076
DO - 10.1016/j.ijheatmasstransfer.2021.121076
M3 - Article
AN - SCOPUS:85101382710
VL - 171
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
SN - 0017-9310
M1 - 121076
ER -