In Situ Observation of Biotite Dissolution at pH 1 Using Advanced Optical Microscopy

Cappelli, Chiara; Van Driessche, Alexander E. S.; Cama, Jordi; Huertas Delgado, Francisco Javier

doi:10.1021/cg400285a

CGANDD2013-accepted.pdf (2.006Mb)

Identificadores

URI: https://hdl.handle.net/10481/111150

DOI: 10.1021/cg400285a

ISSN: 1528-7505

ISSN: 1528-7483

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Editorial

American Chemical Society

Fecha

2013-05-29

Referencia bibliográfica

Cappelli, C.; Van Driessche, A. E. S.; Cama, J. y Huertas Delgado, F. J. (2013). In Situ Observation of Biotite Dissolution at pH 1 Using Advanced Optical Microscopy. Crystal Growth & Design, 13, 7, pp. 2880–2886. https://doi.org/10.1021/cg400285a

Patrocinador

Plan Nacional I+D and EU (CGL2008-01652 and CGL2011-22567); Consolider-Ingenio 2010 project

Resumen

Laser confocal microscopy with differential interference contrast microscopy (LCM-DIM) was used to study in situ the biotite (001) basal surface dissolution performing long-term flow-through experiments at pH 1 (T = 11.5−70 °C). Time-lapse image sequences of large areas (up to 1 mm) of the evolving cleavage (001) surface showed that dissolution only occurs at surface edges. In addition, in contrast to an observed rapid dissolution at low steps (few layers), swelling and contraction of the edge layers occurred at high steps (many layers). An increase in temperature enhanced the surface edge dissolution from 7.5 × 10−4 μm s−1 at 11.5 °C to 6.2 × 10−2 μm s−1 at 70 °C. The results obtained in this work demonstrate that LCM-DIM is a powerful technique to study in situ the dissolution mechanism and kinetics of phyllosilicates.

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