Release characteristics of single-wall carbon nanotubes during manufacturing and handling

I. Ogura, M. Kotake, N. Hashimoto, K. Gotoh, A. Kishimoto

Research output: Contribution to journalConference articlepeer-review

13 Citations (Scopus)


We investigated the release characteristics of single-wall carbon nanotubes (CNTs) synthesized by a pilot-scale plant. In addition to on-site aerosol measurements at the pilot-scale plant where the CNTs were synthesized, harvested, and packed, we conducted dustiness tests by vortex shaking and by transferring CNTs from one bowl to another. In the results of the on-site aerosol measurements, slight increases in the concentration were observed by aerosol monitoring instruments in the enclosure where CNTs were harvested and packed. In filter samples collected in this enclosure, micron-sized CNT clusters were observed by electron microscopy analysis. For samples collected outside the enclosure or during other processes, no CNTs were observed. The concentrations of elemental carbon at all locations were lower than the proposed occupational exposure limits of CNTs. The results of the dustiness tests revealed that submicron-sized particles were dominant in the number concentration measured by aerosol monitoring instruments, whereas micron-sized CNT clusters were mainly observed by electron microscopy analysis. The results of dustiness tests indicate that these CNTs have a low release characteristic. The lower drop impact of CNT clusters due to their lower bulk density resulted in lower CNT release from falling CNTs.

Original languageEnglish
Article number012057
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2013
Event3rd International Conference on Safe Production and Use of Nanomaterials, Nanosafe 2012 - Grenoble, France
Duration: Nov 13 2012Nov 15 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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