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Download fileSuper-Strong Carbon Nanotube Fibers Achieved by Engineering Gas Flow and Postsynthesis Treatment
journal contribution
posted on 2020-03-03, 15:36 authored by Eugene Oh, Hyunjung Cho, Juhan Kim, Ji Eun Kim, Youngjin Yi, Junwon Choi, Haemin Lee, Ye Hoon Im, Kun-Hong Lee, Won Jae LeeCarbon nanotube fibers
(CNTFs) are directly spun from a floating-catalyst
chemical vapor deposition apparatus using gas-phase carbon and an
iron nanocatalyst. The essential synthesis and post-treatment factors
that affect the strength of CNTFs are investigated to obtain CNTFs
with greater strength than those of any previously reported high-performance
fibers. The key factors optimized included the degree of rotational
flow inside the reactor, the ratio of the starting materials, and
the postsynthesis treatment conditions. The formation of rotational
gas flow inside the reactor was confirmed by computational fluid dynamics
simulations, and the feed ratio of the starting materials was optimized
through response surface methodology. In addition, a reproducible
and highly efficient postsynthesis treatment method was established.
Pristine CNTFs with a high specific strength (SS) (average 2.2 N/tex,
max. 2.3 N/tex) were synthesized through decreased rotational flow
and optimization of the CNTF synthesis conditions. To improve the
SS of the CNTFs further, we adopted an acid wet-stretching method
that included washing and heat treatment. This drastically increased
the SS of the CNTFs (average 5.5 N/tex, max. 6.4 N/tex) because of
the decrease in the volume of the pores between the CNT bundles.
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Keywords
post-treatment factorsgas-phase carbonheat treatmentSuper-Strong Carbon Nanotube Fibers Achievedpostsynthesis treatment conditionsCNT bundlesCNTF synthesis conditionsPostsynthesis Treatment Carbon nanotube fiberspostsynthesis treatment methodacid wet-stretching methodfloating-catalyst chemical vapor deposition apparatusfactors optimizedgas flowiron nanocatalystPristine CNTFsSSresponse surface methodologystrengthfluid dynamics simulationsfeed ratioEngineering Gas Flow