Nanoscale insight into the relation between pressure solution of calcite and interfacial friction
Nanoscale insight into the relation between pressure solution of calcite and interfacial friction
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DOI：
10.1016/j.jcis.2021.04.145
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发表时间：
2021-05-31
影响因子：
9.9
通讯作者：
Espinosa-Marzal, Rosa M.
中科院分区：
文献类型：
--
作者：
Fu, Binxin;Diao, Yijue;Espinosa-Marzal, Rosa M.
碳酸盐岩的压力溶解参与了许多地球物理和地球化学过程，但对界面过程的基本认识仍然缺乏。通过同时挤压和滑动两个方解石晶体，用扩展表面力仪同时测量了碳酸钙饱和水中方解石晶体之间的压力溶解速率和摩擦力。这些研究表明，方解石单晶的压力溶解既可以降低摩擦强度，也可以提高摩擦强度。通过原子力显微镜进行纳米尺度的力测量，离子特异性效应在单个粗糙体的水平上被揭示出来。当方解石的界面水层在应力下保持不受干扰时（例如Ca(II)），溶解的离子和水润滑界面时，压力溶液被促进-这种现象称为压力溶液促进滑动。在没有压力溶液的情况下，方解石表面水化层的机械破坏（例如Mg（II）和低Ni（II）浓度）与受限流体更像流体和更色的行为相关。方解石表面电荷的中和作用导致方解石水化层的突变，从而促进了压力溶液的滑移。这项工作促进了对发生在应力方解石受限表面的物理化学相互作用的基本理解。(c) 2021爱思唯尔公司版权所有。
Pressure solution of carbonate-based rocks participates in many geophysical and geochemical processes, but fundamental knowledge of the interfacial processes is still lacking. By concurrently pressing and sliding two single calcite crystals past each other, the pressure solution rate and the friction force between the crystals were concurrently measured in calcium-carbonate saturated water with an extended surface forces apparatus. These studies reveal that both a decrease and an increase in frictional strength can originate from the pressure-solution of calcite single crystals. By conducting nanoscale force measurements with an atomic force microscope, ion specific effects were unveiled at the level of a single asperity. Pressure solution is promoted when the interfacial water layers of calcite remain undisturbed under stress (e.g. with Ca(II)) and the dissolved ions and water lubricate the interface - a phenomenon called pressure-solution facilitated slip. The mechanically induced disruption of the hydration layers of the calcite surface (e.g. with Mg(II) and low Ni(II) concentration) correlates with the more fluid-like and lubricious behavior of the confined fluid in the absence of pressure solution. Charge neutralization of the calcite surface leads to an abrupt change of calcite's hydration layers, which promotes pressure solution facilitated slip. This work advances the fundamental understanding of physicochemical interactions occurring at confined surfaces of stressed calcite. (c) 2021 Elsevier Inc. All rights reserved.