Fast and Versatile Thermo-osmotic Flows with a Pinch of Salt
| Autor: | Herrero, Cecilia, Féliciano, Michael De San, Merabia, Samy, Joly, Laurent |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Nanoscale 14, 626 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1039/D1NR06998E |
| Popis: | Thermo-osmotic flows - flows generated in micro and nanofluidic systems by thermal gradients - could provide an alternative approach to harvest waste heat. However, such use would require massive thermo-osmotic flows, which are up to now only predicted for special and expensive materials. There is thus an urgent need to design affordable nanofluidic systems displaying large thermo-osmotic coefficients. In this paper we propose a general model for thermo-osmosis of aqueous electrolytes in charged nanofluidic channels, taking into account hydrodynamic slip, together with the different solvent and solute contributions to the thermo-osmotic response. We apply this model to a wide range of systems, by studying the effect of wetting, salt type and concentration, and surface charge. We show that intense thermo-osmotic flows can be generated using slipping charged surfaces. We also predict for intermediate wettings a transition from a thermophobic to a thermophilic behavior depending on the surface charge and salt concentration. Overall, this theoretical framework opens an avenue for controlling and manipulating thermally induced flows with common charged surfaces and a pinch of salt. Comment: 7 pages, 3 figures |
| Databáze: | arXiv |
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