Potential explosion hazard of carbonaceous nanoparticles: screening of allotropes.
Turkevich-LA; Fernback-J; Dastidar-AG; Osterberg-P
Combust Flame 2016 May; 167:218-227
There is a concern that engineered carbon nanoparticles, when manufactured on an industrial scale, will pose an explosion hazard. Explosion testing has been performed on 20 codes of carbonaceous pow- ders. These include several different codes of SWCNTs (single-walled carbon nanotubes), MWCNTs (multi- walled carbon nanotubes) and CNFs (carbon nanofibers), graphene, diamond, fullerene, as well as several different control carbon blacks and graphites. Explosion screening was performed in a 20 L explosion chamber (ASTM E1226 protocol), at a concentration of 500 g/m 3 , using a 5 kJ ignition source. Time traces of overpressure were recorded. Samples typically exhibited overpressures of 5-7 bar, and deflagration index K St = V 1/3 (d P /d t ) max more or less 10-80 bar m/s, which places these materials in European Dust Explosion Class St-1. There is minimal variation between these different materials. The explosive characteristics of these carbonaceous powders are uncorrelated with primary particle size (BET specific surface area).
Explosive hazards; Explosive dusts; Nanoparticles; Nanomaterials; Nanotechnology; Dust explosions; Dusts; Hazards; Spontaneous combustion; Exposure levels; Risk factors; Carbon;
Author Keywords: Explosion hazard; Dust; Carbon; Nanoparticle; Nanomaterials
Leonid A. Turkevich, National Institute for Occupational Safety and Health, Division of Applied Research and Technology, 1090 Tusculum Avenue, MS-R7, Cincinnati, OH 45226
Combustion and Flame