Abstract
Validation of the Cabrera-Mott low-temperature oxidation model is proposed to better establish a procedure for the passivation of aluminum nanoparticles after production. The powder, generated in an inductively coupled plasma reactor and characterized by a specific surface of around 40 m2/g, is sampled prior to passivation. Controlled oxidation of the powder is then performed in a TGA/DSC apparatus using different oxygen concentrations. The mass increase due to the oxidation of aluminum to amorphous alumina is mathematically converted into an oxide thickness evolution. The experimental results are then compared with the Cabrera-Mott model and the values of parameters such as the distance between energy barriers, the number of ions per unit area, and the Mott potential are set. In addition, the latter two parameters are varied with the oxygen concentration, following an evolution similar to that of a Langmuir isotherm. This paper then proposes the first validation of a low-temperature oxidation model for aluminum nanoparticles.
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Abbreviations
- TGA:
-
thermogravimetric analysis
- DSC:
-
differential scanning calorimetry
- EEW:
-
electron explosion wire
- TEM:
-
transmission electron microscopy
- EDX:
-
energy dispersive x-ray spectroscopy
- BET:
-
Brunauer–Emmett–Teller
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Acknowledgements
The authors would like to thank the Walloon Region for financial support under convention 7364, KULeuven University for the TEM measurements, and Nanopole S.A. for the nanopowder and the BET measurements.
Funding
This work was funded by the Walloon Region under convention 7364.
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All authors contributed to the study conception and design. The collection of aluminum nanoparticles together with the TGA/DSC testing was performed by G. Glabeke. The post-processing and analysis of the results as well as the model implementation and validation were performed by D. Laboureur. The first draft of the manuscript was written by D. Laboureur and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Laboureur, D., Glabeke, G. & Gouriet, JB. Validation of Cabrera-Mott model for low-temperature oxidation of aluminum nanoparticles. J Nanopart Res 23, 71 (2021). https://doi.org/10.1007/s11051-021-05170-z
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DOI: https://doi.org/10.1007/s11051-021-05170-z