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Ignition and explosion risks of nanopowders
J Bouillard1, A Vignes, O Dufaud
1INERIS, Parc Technologique ALATA, Verneuil-en-Halatte, France. jacques.bouillard@ineris.fr
Journal of Hazardous Materials
|July 2, 2010
Summary
Nanopowder particle size significantly impacts flammability and explosivity. Decreasing particle size lowers ignition temperature and energy, increasing risks, while minimal explosive concentration remains relatively stable.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Nanopowders offer unique properties but pose flammability and explosivity risks.
- Understanding these risks is crucial for safe handling and application.
Purpose of the Study:
- To characterize the flammability and explosivity of select nanopowders.
- To develop analytical models for combustion behavior.
- To analyze the influence of particle size on ignition and explosion parameters.
Main Methods:
- Experimental characterization of nanopowder combustion.
- Development of analytical models relating combustion time to particle diameter.
- Analysis of ignition temperature, minimum ignition energy (MIE), and minimal explosive concentration (MEC) versus particle size.
Main Results:
- Identified two combustion regimes: kinetically controlled (small particles) and diffusion controlled (large particles).
- Found that decreasing particle size reduces minimum ignition temperature (MIT) and MIE, increasing explosion risk.
- Observed minimal variations in MEC with particle size, consistent with a theoretical plateau.
Conclusions:
- Nanopowder explosivity is highly dependent on particle size, with smaller particles presenting greater risks.
- Carbon nanopowders show lower explosion propensity compared to reactive metallic nanopowders.
- Findings highlight significant explosion risks in manufacturing facilities using nanopowders.
