Artigo de peri??dico
Effect of electron beam and gamma rays on carbon nanotube yarn structure
Registro en:
1516-1439
10.1590/1980-5373-MR-2017-0102
20.526
Autor
EVORA, MARIA C.
HIREMATH, NITILAKSHA
LU, XINYI
KANG, NAM-GOO
SILVA, LEONARDO G. de A. e
BHAT, GAJANAN
MAYS, JIMMY
Resumen
Individual carbon nanotubes (CNTs) exhibit excellent mechanical, electrical and thermal properties,
leading to development of a new generation of advanced lightweight materials and spacecraft electronics
substituting the electronics based on silicon. The direct assembly of CNTs into macroscopic fibers
or sheets has been a way to overcome their dispersion and processing challenges. Because of a wide
range of applications of this material, we investigate effectively the defects on CNT yarns structures
created by electron beam and gamma sources and their impact on the morphology and mechanical
properties. The irradiated samples with electron beam at doses of 400, 600 and 800 kGy had a decrease
in the strength from 219.60 ?? 18.90 MPa for pristine yarn to 108.86 ?? 23.77, 153.15 ?? 21.63, 170.50 ??
25.78 MPa, respectively. The sample irradiated with gamma in air at dose of 100 kGy had the strength
increased slightly as compared with the pristine sample and an increase in the elasticity modulus from
8.79 ?? 1.19 to 19.63 ?? 2.02 GPa as compared to CNT pristine yarn. The quality of the CNT yarns that
was gamma irradiated in air with absorbed dose of 100 kGy was not affected by the radiation process
with improvement of 123% of the Young???s modulus.