Electronic screening using a virtual Thomas-Fermi fluid for predicting wetting and phase transitions of ionic liquids at metal surfaces
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2020
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| _version_ | 1866910386907774976 |
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| author | Schlaich, Alexander Jin, Dongliang Bocquet, Lydéric Coasne, Benoit |
| author_facet | Schlaich, Alexander Jin, Dongliang Bocquet, Lydéric Coasne, Benoit |
| contents | Of relevance to energy storage, electrochemistry and catalysis, ionic and dipolar liquids display unexpected behaviours-especially in confinement. Beyond adsorption, over-screening and crowding effects, experiments have highlighted novel phenomena, such as unconventional screening and the impact of the electronic nature-metallic versus insulating - of the confining surface. Such behaviours, which challenge existing frameworks, highlight the need for tools to fully embrace the properties of confined liquids. Here we introduce a novel approach that involves electronic screening while capturing molecular aspects of interfacial fluids. Although available strategies consider perfect metal or insulator surfaces, we build on the Thomas-Fermi formalism to develop an effective approach that deals with any imperfect metal between these asymptotes. Our approach describes electrostatic interactions within the metal through a 'virtual' Thomas-Fermi fluid of charged particles, whose Debye length sets the screening length $λ$. We show that this method captures the electrostatic interaction decay and electrochemical behaviour on varying $λ$. By applying this strategy to an ionic liquid, we unveil a wetting transition on switching from insulating to metallic conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2002_11526 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Electronic screening using a virtual Thomas-Fermi fluid for predicting wetting and phase transitions of ionic liquids at metal surfaces Schlaich, Alexander Jin, Dongliang Bocquet, Lydéric Coasne, Benoit Chemical Physics Materials Science Soft Condensed Matter Computational Physics Of relevance to energy storage, electrochemistry and catalysis, ionic and dipolar liquids display unexpected behaviours-especially in confinement. Beyond adsorption, over-screening and crowding effects, experiments have highlighted novel phenomena, such as unconventional screening and the impact of the electronic nature-metallic versus insulating - of the confining surface. Such behaviours, which challenge existing frameworks, highlight the need for tools to fully embrace the properties of confined liquids. Here we introduce a novel approach that involves electronic screening while capturing molecular aspects of interfacial fluids. Although available strategies consider perfect metal or insulator surfaces, we build on the Thomas-Fermi formalism to develop an effective approach that deals with any imperfect metal between these asymptotes. Our approach describes electrostatic interactions within the metal through a 'virtual' Thomas-Fermi fluid of charged particles, whose Debye length sets the screening length $λ$. We show that this method captures the electrostatic interaction decay and electrochemical behaviour on varying $λ$. By applying this strategy to an ionic liquid, we unveil a wetting transition on switching from insulating to metallic conditions. |
| title | Electronic screening using a virtual Thomas-Fermi fluid for predicting wetting and phase transitions of ionic liquids at metal surfaces |
| topic | Chemical Physics Materials Science Soft Condensed Matter Computational Physics |
| url | https://arxiv.org/abs/2002.11526 |