CHEMICAL DISSOLUTION OF THE GALENA(001) SURFACE OBSERVED USING ELECTROCHEMICAL SCANNING TUNNELING MICROSCOPY
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dc.contributor.author | Higgins S.R. | |
dc.contributor.author | Hamers R.J. | |
dc.date.accessioned | 2020-11-22T04:11:53Z | |
dc.date.available | 2020-11-22T04:11:53Z | |
dc.date.issued | 1996 | |
dc.identifier | https://elibrary.ru/item.asp?id=490302 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1996, , 16, 3067-3073 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/19240 | |
dc.description.abstract | The chemical dissolution of galena(001) surfaces immersed in acidic and neutral sulfate electrolyte solutions was investigated using Electrochemical Scanning Tunneling Microscopy (ECSTM). The nanometer-scale detail provided by the STM in this investigation provides new mechanistic information regarding surface dissolution processes at the mineral/water interface. In acidic solutions (pH = 2.7), we observe that dissolution occurs by selective removal of step edge species. This process is crystallographically anisotropic, resulting in steps with <110> orientations. Under neutral pH conditions (pH = 7), the dissolution rate is significantly lower, and no preferential step edge orientation is observed. The anisotropy observed in acidic solutions is attributed to different kinetic rates of dissolution along the <110> and <100> directions. Furthermore, we propose that the rate limiting step in the dissolution mechanism is the desorption of hydrosulfide (HS-) from step edges. The origin of the crystallographic anisotropy is discussed in terms of possible atomic structures of the step edges. | |
dc.title | CHEMICAL DISSOLUTION OF THE GALENA(001) SURFACE OBSERVED USING ELECTROCHEMICAL SCANNING TUNNELING MICROSCOPY | |
dc.type | Статья |
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