Experimental coalescence characteristic time of carbon nanoparticle produced from ethylene or benzene pyrolysis.

The coalescence behavior of soot and carbon black has not been so much discussed. The coalescence rate was obtained from the previous experimental results which measured the decrease in mobility diameter by re-heating with tandem differential mobility analyzer. Employing the rate expression used for sintering metallic and inorganic nanoparticles, it was found that the ease of coalescence varied with particle size. It was also suggested that the mechanism of coalescence may differ depending on the temperature. A model of coalescence kinetics based on crystallinity could not represent experimental coalescence kinetics. [Display omitted] • Estimation of coalescence rate constants for carbon nanoparticles. • Conventional formula greatly overestimates coalescing rate. • Coalescence was multi-staged, different mechanism from metal nanoparticles. [ABSTRACT FROM AUTHOR]