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In situ observation of biotite dissolution at pH 1 using advanced optical microscopy

机译:使用先进的光学显微镜原位观察黑云母在pH 1时的溶解情况

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摘要

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.
机译:激光共聚焦显微镜和微分干涉对比显微镜(LCM-DIM)用于原位研究黑云母(001)的基础表面溶解,在pH 1(T = 11.5-70 C)下进行长期流通实验。不断演变的乳沟(001)表面的大面积延时图像序列(最大1毫米)显示溶解仅发生在表面边缘。此外,与观察到的低阶跃(几层)快速溶解相反,边缘层的膨胀和收缩在高阶跃(许多层)发生。温度升高使表面边缘溶解度从11.5 C的7.5×10〜(-4)μms〜(-1)升高到70 C的6.2×10〜(-2)μms〜(-1)。在这项工作中获得的结果表明,LCM-DIM是一种强大的技术,可以原位研究页硅酸盐的溶解机理和动力学。

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