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DOI | 10.1073/pnas.1908086116 |
Ion exchange selectivity in clay is controlled by nanoscale chemical-mechanical coupling | |
Whittaker, Michael L.1,2; Lammers, Laura N.1,3; Carrero, Sergio1,2; Gilbert, Benjamin2; Banfield, Jillian F.1,2,3 | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2019 |
卷号 | 116期号:44页码:22052-22057 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Ion exchange in nanoporous clay-rich media plays an integral role in water, nutrient, and contaminant storage and transport. In montmorillonite (MMT), a common clay mineral in soils, sediments, and muds, the swelling and collapse of clay particles through the addition or removal of discrete molecular layers of water alters cation exchange selectivities in a poorly understood way. Here, we show that ion exchange is coupled to the dynamic delamination and restacking of clay layers, which creates a feedback between the hydration state of the exchanging cation and the composition of the clay interlayer. Particles with different hydration states are distinct phases with unique binding selectivities. Surprisingly, equilibrium achieved through thermal fluctuations in cation concentration and hydration state leads to the exchange of both ions and individual MMT layers between particles, a process we image directly with high-resolution transmission electron microscopy at cryogenic conditions (cryo-TEM). We introduce an exchange model that accounts for the binding selectivities of different phases, which is likely applicable to many charged colloidal or macromolecular systems in which the structural conformation is correlated with the activities of water and counterions within spatially confined compartments. |
英文关键词 | montmorillonite ion exchange dynamic equilibrium cryo-TEM |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000493720200021 |
WOS关键词 | MOLECULAR-DYNAMICS SIMULATIONS ; X-RAY-DIFFRACTION ; WATER-VAPOR ; MONTMORILLONITE ; ALKALI ; ENERGY ; SCALE ; THERMODYNAMICS ; ADSORPTION ; DESORPTION |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205198 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Lawrence Berkeley Natl Lab, Energy Geosci Div, Berkeley, CA 94720 USA; 2.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA; 3.Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA |
推荐引用方式 GB/T 7714 | Whittaker, Michael L.,Lammers, Laura N.,Carrero, Sergio,et al. Ion exchange selectivity in clay is controlled by nanoscale chemical-mechanical coupling[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(44):22052-22057. |
APA | Whittaker, Michael L.,Lammers, Laura N.,Carrero, Sergio,Gilbert, Benjamin,&Banfield, Jillian F..(2019).Ion exchange selectivity in clay is controlled by nanoscale chemical-mechanical coupling.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(44),22052-22057. |
MLA | Whittaker, Michael L.,et al."Ion exchange selectivity in clay is controlled by nanoscale chemical-mechanical coupling".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.44(2019):22052-22057. |
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