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Size Effects in MgO Cube Dissolution

S. O. Baumann ; J. Schneider ; A. Sternig ; D. Thomele ; S. Stankic ; T. Berger ; Henrik Grönbeck (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK)) ; O. Diwald
Langmuir (0743-7463). Vol. 31 (2015), 9, p. 2770-2776.
[Artikel, refereegranskad vetenskaplig]

Stability parameters and dissolution behavior of engineered nanomaterials in aqueous systems are critical to assess their functionality and fate under environmental conditions. Using scanning electron microscopy, transmission electron microscopy, and X-ray diffraction, we investigated the stability of cubic MgO particles in water. MgO dissolution proceeding via water dissociation at the oxide surface, disintegration of Mg2+-O2- surface elements, and their subsequent solvation ultimately leads to precipitation of Mg(OH)(2) nanosheets. At a pH >= 10, MgO nanocubes with a size distribution below 10 nm quantitatively dissolve within few minutes and convert into Mg(OH)(2) nanosheets. This effect is different from MgO cubes originating from magnesium combustion in air. With a size distribution in the range 10 nm <= d <= 1000 nm they dissolve with a significantly smaller dissolution rate in water. On these particles water induced etching generates (110) faces which, above a certain face area, dissolve at a rate equal to that of (100) planes.(1) The delayed solubility of microcrystalline MgO is attributed to surface hydroxide induced self-inhibition effects occurring at the (100) and (110) microplanes. The present work underlines the importance of morphology evolution and surface faceting of engineered nanomaterials particles during their dissolution.



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Denna post skapades 2015-04-20. Senast ändrad 2017-09-12.
CPL Pubid: 215421

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)
Kompetenscentrum katalys (KCK)

Ämnesområden

Materialvetenskap
Nanovetenskap och nanoteknik
Fysikalisk kemi
Materialteknik

Chalmers infrastruktur

C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)