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231224s2015 xx |||||o 00| ||eng c |
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|a 10.1021/la504651v
|2 doi
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|a eng
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|a Baumann, Stefan O
|e verfasserin
|4 aut
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|a Size effects in MgO cube dissolution
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|c 2015
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|a Text
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|a ƒaComputermedien
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|a Date Completed 11.05.2015
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|a Date Revised 10.03.2015
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a 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 Mg(2+)-O(2-) 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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|a Journal Article
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|a Schneider, Johannes
|e verfasserin
|4 aut
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|a Sternig, Andreas
|e verfasserin
|4 aut
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| 700 |
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|a Thomele, Daniel
|e verfasserin
|4 aut
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|a Stankic, Slavica
|e verfasserin
|4 aut
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|a Berger, Thomas
|e verfasserin
|4 aut
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|a Grönbeck, Henrik
|e verfasserin
|4 aut
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|a Diwald, Oliver
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 31(2015), 9 vom: 10. März, Seite 2770-6
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|x 1520-5827
|7 nnns
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| 773 |
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|g volume:31
|g year:2015
|g number:9
|g day:10
|g month:03
|g pages:2770-6
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