Solid–Liquid Interface Structure of Muscovite Mica in CsCl and RbBr Solutions

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• 作者：Stelian Pintea ; Wester de Poel ; Aryan E. F. de Jong ; Vedran Vonk ; Pim van der Asdonk ; Jakub Drnec ; Olivier Balmes ; Helena Isern ; Thomas Dufrane ; Roberto Felici ; Elias Vlieg
• 刊名：Langmuir
• 出版年：2016
• 出版时间：December 13, 2016
• 年：2016
• 卷：32
• 期：49
• 页码：12955-12965
• 全文大小：784K
• ISSN：1520-5827

文摘

The solid–liquid interface formed by single terminated muscovite mica in contact with two different ionic solutions is analyzed using surface X-ray diffraction. Specular and nonspecular crystal truncation rods of freshly cleaved mica immersed in CsCl or RbBr aqueous solution were measured. The half monolayer of the surface potassium ions present after the cleavage is completely replaced by the positive ions (Cs⁺ or Rb⁺) from the solution. These ions are located in the ditrigonal surface cavities with small outward relaxations with respect to the bulk potassium position. We find evidence for the presence of a partly ordered hydration shell around the surface Cs⁺ or Rb⁺ ions and partly ordered negative ions in the solution. The lateral liquid ordering induced by the crystalline surface vanishes at distances larger than 5 Å from the surface.