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DIELECTRIC RELAXATION OF WATER IN CLAY MINERALS

机译：粘土矿物中水的介电弛豫

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摘要

The study of confined water dynamics in clay minerals is a very important topic in aluminosilicate-surface chemistry. Aluminosilicates are among the most technologically versatile materials in industry today. Dielectric spectroscopy is a very useful method for investigating the structure and dynamics of water adsorbed on solid matrix surfaces and water in the vicinity of ions in solutions. Use of this method for the study of clay minerals has been underutilized to date, however. The main goal of the present research was to understand the relaxation mechanisms of water molecules interacting with different hydration centers in clay minerals, with a view to eventually control this interaction. Two types of natural layered aluminosilicates (clay minerals) - montmorillonite with exchangeable K~+, Co~(2+), and Ni~(2+) cations and kaolinite with exchangeable K~+ and Ba~(2+) cations - were examined by means of dielectric spectroscopy over wide ranges of temperature (from -121℃ to+300℃) and frequency (1 Hz-1 MHz). An analysis of the experimental data is provided in terms of four distributed relaxation processes. The low-temperature relaxation was observed only in montmorillonites and could be subdivided into two processes, each related to a specific hydration center. The cooperative behavior of water at the interface was observed in the intermediate temperature region, together with a proton percolation. The dielectric properties of ice-like and confined water structures in the layered clay minerals were compared with the dielectric response observed in porous glasses. The spatial fractal dimensions of the porous aluminosilicates were calculated by two separate methods - from an analysis of the fractality found in photomicrographs and from the dielectric response.
机译：粘土矿物中受限水动力学的研究是硅铝酸盐表面化学中非常重要的课题。铝硅酸盐是当今工业上技术上最通用的材料之一。介电谱法是一种非常有用的方法，用于研究固体基质表面吸附的水和溶液中离子附近的水的结构和动力学。迄今为止，这种方法用于粘土矿物研究的利用尚未得到充分利用。本研究的主要目的是了解水分子与粘土矿物中不同水合中心相互作用的弛豫机理，以期最终控制这种相互作用。两种天然层状铝硅酸盐（粘土矿物）是具有可交换K〜+，Co〜（2+）和Ni〜（2+）阳离子的蒙脱土和具有可交换K〜+和Ba〜（2+）阳离子的高岭石。通过介电光谱法在很宽的温度范围（从-121℃到+ 300℃）和频率（1 Hz-1 MHz）下进行了检测。根据四个分布式松弛过程对实验数据进行了分析。低温松弛仅在蒙脱土中观察到，可分为两个过程，每个过程与特定的水合中心有关。在中间温度区域观察到水在界面处的协同行为，并观察到质子渗滤。将层状粘土矿物中冰状和承压水结构的介电特性与在多孔玻璃中观察到的介电响应进行了比较。多孔铝硅酸盐的空间分形维数是通过两种单独的方法计算的-从显微照片中发现的分形性分析和介电响应。

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  • 来源
    《Clays and clay minerals》 |2014年第2期|62-73|共12页
  • 作者

    Maria A. Vasilyeva; Yuri A. Gusev; Valery G. Shtyrlin; Anna Greenbaum (Gutina); Alexander Puzenko; Paul Ben Ishai; Yuri Feldman;

  • 作者单位

    The Kazan Federal University, Institute of Physics, Kremlevskaya st. 18, 420008, Kazan, Russian Federation;

    The Kazan Federal University, Institute of Physics, Kremlevskaya st. 18, 420008, Kazan, Russian Federation;

    The Kazan Federal University, A.M. Butlerov Chemistry Institute, Kremlevskaya st. 18, 420008, Kazan, Russian Federation;

    The Hebrew University of Jerusalem, Department of Applied Physics, Edmond J. Safra Campus, Givat Ram 91904, Jerusalem, Israel;

    The Hebrew University of Jerusalem, Department of Applied Physics, Edmond J. Safra Campus, Givat Ram 91904, Jerusalem, Israel;

    The Hebrew University of Jerusalem, Department of Applied Physics, Edmond J. Safra Campus, Givat Ram 91904, Jerusalem, Israel;

    The Hebrew University of Jerusalem, Department of Applied Physics, Edmond J. Safra Campus, Givat Ram 91904, Jerusalem, Israel;

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  • 正文语种 eng
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  • 关键词

    Adsorbed Water; Dielectric Spectroscopy; Exchangeable Cations; Fractal Dimension; Kaolinite; Montmorillonite;

    机译：吸附水;介电谱;可交换阳离子;分形维数高岭石;蒙脱石;

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