NDLI: Effect of particle coating on the thermal response of mixtures of micro- and nano-aluminum particles with water

Content Provider	Springer Nature Link
Author	Trowell, K. A. Wang, J. Wang, Y. Yavor, Y. Goroshin, S. Bergthorson, J. M. Frost, D. L. St Charles, J. C. Dubois, C.
Copyright Year	2016
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.
Starting Page	1027
Ending Page	1036
Page Count	10
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	127
Issue Number	1
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-08-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ageing effect Aluminum–water reaction Energy carriers Hydrogen production Metal fuels Nanopowder Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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