Pressure solution - The importance of the electrochemical surface potentials
Pressure solution - The importance of the electrochemical surface potentials
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DOI：
10.1016/j.gca.2011.09.019
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发表时间：
2011-11
影响因子：
5
通讯作者：
K. Kristiansen;M. Valtiner;G. Greene;J. Boles;J. Israelachvili
中科院分区：
文献类型：
--
作者：
K. Kristiansen;M. Valtiner;G. Greene;J. Boles;J. Israelachvili
在富含粘土的砂岩中经常发现的“压溶”，其特征是颗粒间接触处的石英溶解增强。压力溶解和许多其他相关溶解过程的起源仍然难以捉摸。使用电化学表面力装置，我们可视化并测量了接近电极表面的二氧化硅玻璃表面的溶解。通过Butler-Volmer腐蚀方程，溶解速率与电极电位定量相关。我们的实验结果表明，在低温下，表观压力溶解和许多其他矿物溶解现象可以由电化学过程而不是压力驱动过程驱动。这一发现突出了电化学表面电位在不同材料界面溶解现象中的作用，并提供了新的观点，特别是压力溶液和溶解现象的预测控制的新的理论基础。
“Pressure solution”, frequently found in clay-rich sandstone, is characterized by enhanced quartz dissolution at inter-grain contacts. The origin of pressure solution and many other related dissolution processes remains elusive. Using an Electrochemical Surface Forces Apparatus we visualized and measured the dissolution of silica glass surfaces close to an electrode surface. The dissolution rates correlate quantitatively with the electrode potential via the Butler–Volmer equation for corrosion. Our experimental results demonstrate that at low temperature, apparent pressure solution and many other mineral dissolution phenomena can be driven by electrochemical processes rather than a pressure-driven process. This finding highlights the role of electrochemical surface potentials in dissolution phenomena at dissimilar material interfaces, and provides new perspectives on pressure solution in particular and a new theoretical basis for predictive control of dissolution phenomena in general.