A grahame triple-layer model unifies mica monovalent ion exchange, zeta potential, and surface forces
| Autor: | Andrew R. Crothers, Clayton J. Radke, Charles Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Electrical double layer Hydronium Surface forces 02 engineering and technology 010402 general chemistry 01 natural sciences Ion Ion solvation chemistry.chemical_compound Engineering Colloid and Surface Chemistry Zeta potential Zeta potentials Surface charge Physical and Theoretical Chemistry Chemical Physics Surface force Charge density Surfaces and Interfaces Triple-layer structure 021001 nanoscience & nanotechnology Electrostatics 0104 chemical sciences stomatognathic diseases chemistry Chemical physics Chemical Sciences Mica 0210 nano-technology Ion complexation Ion exchange |
| Zdroj: | Advances in Colloid and Interface Science. 288:102335 |
| ISSN: | 0001-8686 |
| DOI: | 10.1016/j.cis.2020.102335 |
| Popis: | A triple-layer model of the mica/water electrical double layer (EDL) unifies prediction of zeta potential, ion-exchange, and surface-force isotherms. The theory treats cations as partially dehydrated and complexed specifically to the anionic exchange sites of mica. A diffuse layer commencing at the outer Helmholtz plane (OHP) balances the surface charge not neutralized by adsorbed cations in the inner Helmholtz plane (IHP). Ion-binding equilibrium constants are assessed from zeta-potential measurements and used thereafter to predict ion-exchange isotherms and surface forces. Basal-plane mica surface charge is almost completely neutralized by specific binding of cations, including hydronium ions. The charge in the diffuse layer is only a few percent of the mica crystallographic charge density but leads to long-range electrostatic interactions between charged surfaces. The Grahame triple-layer model of the aqueous EDL provides a robust, quantitative, and unified description of the mica/water interface. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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