Surface energy and strain effects on calcite dissolution

表面能和应变对方解石溶解的影响

• 批准号: 27603184
• 负责人: Professor Dr. Andrew Putnis
• 金额: --
• 依托单位: Institut für Mineralogie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/27603184?language=en
• 关键词: Surface; energy; strain; effects; calcite

The objective is to determine experimentally the effect of surface reactivity (in terms of the orientation of the surface relative to a cleavage plane) as well as stress (elastic strain and plastic deformation) on the mechanisms and rates of calcite dissolution. The techniques used will be: in-situ fluid-cell Atomic Force Microscopy (AFM) .Vertical Scanning Interferometry (VSI) and Transmission Electron Microscopy (TEM). We will study the dissolution and surface reorganisation of calcite single-crystal surfaces polished with varying miscut angles (e.g., 5°, 10°, 20°) to the cleavage planes. The effect of the saturation state of the fluid will be determined. The role of elastic strain will be determined using a newly developed microbending method to stress single-crystals of calcite and gypsum up to the elastic limit, without brittle failure, within the fluid cell of an AFM. The effect of plastic deformation on the dissolution mechanism will be studied as a function of fluid saturation. TEM will be used to characterise surface reconstruction, dislocation structure of the samples, and defects caused by sample preparation or by the applied stress.

目的是通过实验确定表面反应性（相对于解理面而言的表面取向）以及应力（弹性应变和塑性变形）对方解石溶解机制和速率的影响。使用的技术将是：原位流体细胞原子力显微镜（AFM）。垂直扫描干涉测量（VSI）和透射电子显微镜（TEM）。我们将研究方解石单晶表面以不同的错切角度（例如，5°，10°，20°）抛光的解理面溶解和表面重组。流体饱和状态的影响将被确定。弹性应变的作用将使用一种新开发的微弯曲方法来确定方解石和石膏的单晶应力达到弹性极限，而不会在AFM的流体池中发生脆性破坏。塑性变形对溶解机理的影响将作为流体饱和度的函数进行研究。TEM将用于表征表面重建、样品的位错结构以及由样品制备或施加应力引起的缺陷。