Unravelling the surface structure and reactivity of the calcite (1014) cleavage plane by threedimensional force field spectroscopy

通过三维力场谱揭示方解石（1014）解理面的表面结构和反应性

• 批准号: 195396397
• 负责人: Professorin Dr. Angelika Kühnle
• 金额: --
• 依托单位: Arbeitsgruppe Physikalische Chemie I
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/195396397?language=en
• 关键词: Unravelling; surface; structure; reactivity; calcite

Calcite is the most stable polymorph of calcium carbonate and abundant in the geological environment. Consequently, the surface structure and reactivity of calcite surfaces are of utmost importance for various fields, including biomineralization and scale inhibition. Many of these areas have in common that they are governed by the interaction of certain molecules with the calcite surface.The most stable cleavage plane of calcite, calcite (1014), is known to exhibit distinct deviations from the bulk-truncated structure. While the existence of these deviations is free of doubt, the physical origin remains unresolved so far.In this project, we aim at unravelling the surface structure and reactivity by measuring the three-dimensional force field of the (1014) calcite cleavage plane using high-resolution atomic force microscopy in ultra-high vacuum. Force field spectroscopy allows for mapping the three-dimensional force field acting between the tip of the microscope and the sample surface down to the atomic level. Special emphasis will be on understanding temperaturedependent changes of the surfaces properties in the temperature range from low (30 K) to elevated temperatures (370 K).To investigate the surface reactivity of the calcite cleavage plane with respect to understanding the interaction of amino acids with this surface, we will functionalize the microscope tip with a COOH-moiety. Upon performing three-dimensional force spectroscopy with such a tip, we will gain site-specific information on attraction and repulsion as well as the interaction range felt by the COOH group, mimicking the interaction of amino acids with the calcite cleavage plane.

方解石是碳酸钙最稳定的晶型，在地质环境中含量丰富。因此，方解石表面的结构和反应性对于包括生物矿化和阻垢在内的各个领域都是至关重要的。这些区域有许多共同之处，它们是由某些分子与方解石表面的相互作用所控制的。方解石最稳定的解理面，方解石(1014)，已知表现出与整体截断结构的明显偏离。虽然这些偏差的存在是毋庸置疑的，但其物理起源至今仍未解决。在这个项目中，我们的目标是通过在超高真空中使用高分辨率原子力显微镜测量(1014)方解石解理面的三维力场来解开表面结构和反应性。力场光谱学允许将作用于显微镜尖端和样品表面之间的三维力场映射到原子级别。特别强调了解表面性质在低温(30K)到高温(370K)范围内随温度的变化。为了研究方解石解离面的表面反应性，以了解氨基酸与该表面的相互作用，我们将用COOH-部分来功能化显微镜尖端。在用这样的尖端进行三维力光谱后，我们将获得关于吸引和排斥的特定位置信息以及COOH基团感受到的相互作用范围，模拟氨基酸与方解石解理平面的相互作用。

项目成果

Identifying the absolute orientation of a low-symmetry surface in real space

识别真实空间中低对称性表面的绝对方向

• DOI: 10.1103/physrevb.90.195405
• 发表时间: 2014
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Stefan Kuhn;Markus Kittelmann;Yoshiaki Sugimoto;Masayuki Abe;Angelika Kühnle;Philipp Rahe
• 通讯作者: Philipp Rahe

Discriminating short-range from van der Waals forces using total force data in noncontact atomic force microscopy

使用非接触原子力显微镜中的总力数据区分短程力和范德华力

• DOI: 10.1103/physrevb.89.235417
• 发表时间: 2014
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Stefan Kuhn;Philipp Rahe
• 通讯作者: Philipp Rahe