TY - JOUR
T1 - Evolution of size distribution and morphology of carbon nanoparticles during ethylene pyrolysis
AU - Dewa, Kazuki
AU - Ono, Kiminori
AU - Watanabe, Aki
AU - Takahashi, Kaname
AU - Matsukawa, Yoshiya
AU - Saito, Yasuhiro
AU - Matsushita, Yohsuke
AU - Aoki, Hideyuki
AU - Era, Koki
AU - Aoki, Takayuki
AU - Yamaguchi, Togo
N1 - Publisher Copyright:
© 2015 The Combustion Institute.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - The effects of furnace temperature and residence time on particle size distributions (PSDs) of carbon black, which is a type of carbon nanoparticle, were studied with a scanning mobility particle sizer. Particles were classified according to their mobility diameters by a differential mobility analyzer, followed by thermophoretic sampling by scanning electron microscopy to investigate their carbon black morphologies. PSDs were power-law distributions at short residence times and log-normal distributions at long residence times; these distributions indicate that agglomeration increases with increasing residence time. In addition, few 2.5-nm-sized particles existed above 1540 ± 40 K, while the critical size was 3 nm at 1350 ± 40 K. This finding indicates that the critical size of nuclei changes with temperature. At high temperatures of 1776 and 1676 K, the 100 and 180-nm-sized particles, whose primary particles kept their shape, had very complex morphologies. In contrast, at low temperature at 1570 K, the morphologies of 100 and 180-nm-sized aggregates are relativity simple, and primary particles nearly fused together in those aggregates. These observations indicate that the nucleation rate and fusing behavior change with temperature.
AB - The effects of furnace temperature and residence time on particle size distributions (PSDs) of carbon black, which is a type of carbon nanoparticle, were studied with a scanning mobility particle sizer. Particles were classified according to their mobility diameters by a differential mobility analyzer, followed by thermophoretic sampling by scanning electron microscopy to investigate their carbon black morphologies. PSDs were power-law distributions at short residence times and log-normal distributions at long residence times; these distributions indicate that agglomeration increases with increasing residence time. In addition, few 2.5-nm-sized particles existed above 1540 ± 40 K, while the critical size was 3 nm at 1350 ± 40 K. This finding indicates that the critical size of nuclei changes with temperature. At high temperatures of 1776 and 1676 K, the 100 and 180-nm-sized particles, whose primary particles kept their shape, had very complex morphologies. In contrast, at low temperature at 1570 K, the morphologies of 100 and 180-nm-sized aggregates are relativity simple, and primary particles nearly fused together in those aggregates. These observations indicate that the nucleation rate and fusing behavior change with temperature.
KW - Aggregate
KW - Carbon black
KW - Pyrolysis
KW - Soot
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U2 - 10.1016/j.combustflame.2015.09.007
DO - 10.1016/j.combustflame.2015.09.007
M3 - Article
AN - SCOPUS:85027941158
VL - 163
SP - 115
EP - 121
JO - Combustion and Flame
JF - Combustion and Flame
SN - 0010-2180
ER -