Interlayer cation effects on optical and dielectric properties of montmorillonite in terahertz frequency band

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-05-12 DOI:10.1016/j.clay.2025.107857

Lixian Hao , Shusen Zhou , Zhiyuan Zheng , Chutong Gao , Mingrui Zhang , Tong Zhang , Haochong Huang , Bingcheng Luo , Hao Liu

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Abstract

This study investigates the optical and dielectric properties of montmorillonite through terahertz time-domain spectroscopy. The results reveal that the absorption coefficient, refractive index, dielectric constant, and conductivity increase with montmorillonite content. Notably, differences were observed between Na-type and Ca-type montmorillonite, particularly in dielectric constants, with Na-type exhibiting a stronger dielectric response. Additionally, humidity significantly affects these properties, with both optical and dielectric characteristics increasing with moisture content. Molecular dynamics simulations analyzed and compared self-diffusion coefficients and radial distributions of both montmorillonite types, revealing conductivity peaks at 0.59 (Na-type) and 0.44 (Ca-type), which are supporting experimental results. These findings suggest that montmorillonite type and humidity significantly influence their optical and dielectric properties, providing a framework for understanding montmorillonite behavior in the terahertz frequency range.

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层间阳离子对太赫兹蒙脱土光学和介电性能的影响

利用太赫兹时域光谱技术研究了蒙脱土的光学和介电性质。结果表明，随着蒙脱土含量的增加，材料的吸收系数、折射率、介电常数和电导率均增大。值得注意的是，na型和ca型蒙脱土之间存在差异，特别是在介电常数方面，na型蒙脱土表现出更强的介电响应。此外，湿度显著影响这些特性，光学和介电特性随含水量的增加而增加。分子动力学模拟分析比较了两种蒙脱土类型的自扩散系数和径向分布，发现电导率峰值分别为0.59 （na型）和0.44 （ca型），与实验结果吻合。这些发现表明，蒙脱土的类型和湿度显著影响其光学和介电性能，为理解蒙脱土在太赫兹频率范围内的行为提供了一个框架。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...