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- Title
Effect of particle coating on the thermal response of mixtures of micro- and nano-aluminum particles with water.
- Authors
Trowell, K.; Wang, J.; Wang, Y.; Yavor, Y.; Goroshin, S.; Bergthorson, J.; Frost, D.; St-Charles, J.; Dubois, C.
- Abstract
Differential scanning calorimetry is used to determine the thermal response of commercially available aluminum powders reacting with an excess of water. Thermal response as a function of ageing, particle coating and heating rate is examined. The effect of the surface-to-volume ratio of the reaction vessel is also examined through the use of a purpose-built ignition apparatus. The work is motivated by the use of metal-water reactions to generate gaseous hydrogen for energy applications. Four powders are considered: nanopowder with preexisting oxide coating (U-ALEX), Viton-coated nanopowder (V-ALEX), nonadecyclic-acid-coated nanopowder (L-ALEX) and oxide-coated micron-sized powder (H-2). The powder is mixed with water prior to testing, facilitated by ultrasonic agitation or the addition of a surfactant as needed. To determine the effect of ageing on the reaction onset temperature, selected samples are aged for 0, 1, 2, 5 and 14 days before being subjected to heat. The lowest and highest reaction onset temperatures were observed for the U-ALEX and L-ALEX powder mixtures, respectively. Coated powders had higher onset temperatures. The coatings offered some protection from oxidation, whereas the uncoated samples oxidized completely within 48 h. H-2, U-ALEX and V-ALEX exhibited similar activation energies and showed a slight decline in reaction onset temperature with ageing. It was not possible to determine an activation energy for L-ALEX. Within the limited range of the study, the surface-to-volume ratio of the reaction vessel had no significant impact on ignition temperature.
- Subjects
METAL coating; ALUMINUM powder; ALUMINUM alloys; MIXTURES; DIFFERENTIAL scanning calorimetry; RESPONSIVE gels
- Publication
Journal of Thermal Analysis & Calorimetry, 2017, Vol 127, Issue 1, p1027
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-016-5775-1