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Synthesis and characterisation of a porous Al scaffold sintered from NaAlH4

Author:
Ianni, Enrico, Sofianos, M. Veronica, Sheppard, Drew A., Rowles, Matthew R., Humphries, Terry D., Liu, Shaomin, Buckley, Craig E.
Source:
Journal of materials science 2018 v.53 no.2 pp. 1076-1087
ISSN:
0022-2461
Subject:
X-radiation, X-ray diffraction, aluminum, cost effectiveness, hydrogen, porosity, scanning electron microscopy, sodium, surface area, temperature
Abstract:
A simple and cost-effective method for the synthesis of a porous Al scaffold has been optimised using only NaAlH₄ and TiCl₃. The starting materials were compacted into a pellet and sintered under dynamic vacuum to remove the Na and H₂. The sintering conditions, such as vacuum level, temperature, and time, were the key factors that influenced both the extraction of Na and H₂ from the pellet and the overall porosity. Quantitative phase analysis by X-ray diffraction revealed that after the sintering process, the as-prepared porous Al scaffold consisted primarily of Al. Morphological observations conducted by scanning electron microscopy showed that the scaffold exhibited an open network of pores with a small number of mesopores and no formation of micropores. The specific surface area of the scaffold was determined to be 7.9 ± 0.1 and 6.0 ± 0.5 m²/g by the Brunauer–Emmet–Teller method and from small-angle X-ray scattering measurements, respectively. The total porosity of the Al scaffold was 44.6%.
Agid:
5849632