Spreading Dynamics of a Precursor Film of Ionic Liquid or Water on a Micropatterned Polyelectrolyte Brush Surface
| Autor: | Hayato Higuchi, Shohei Shiomoto, Hiromitsu Takaba, Kazuo Yamaguchi, Motoyasu Kobayashi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Methacrylate Polymer brush 01 natural sciences Polyelectrolyte 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Monolayer Ionic liquid Electrochemistry General Materials Science Wetting Thin film Elongation 0210 nano-technology Spectroscopy |
| Zdroj: | Langmuir. 37:3049-3056 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.0c03260 |
| Popis: | Time evolution of the microscopic wetting velocity of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI-TFSI) or water on a micrometer-scale line-patterned surface with a poly(3-sulfopropyl methacrylate) brush and a hydrophobic perfluoroalkyl monolayer was precisely measured by direct observation using optical microscopy and a selective dyeing method over a long period (178 days). When a liquid droplet was placed on the dyed line-patterned brush surface, the liquid penetrated and spread into the polymer brush layer, forming a precursor thin film that extended beyond the macroscopic contact line. The elongation proceeded in two stages by an adiabatic process followed by a diffusive process. The elongation distance X increased with time in proportion to t2.6 for water and t0.81 for EMI-TFSI during the adiabatic process. In a diffusive process, the advancing velocity of the precursor film was markedly reduced to be expressed as X ∝ t0.66 for water and X ∝ t0.21 for EMI-TFSI, indicating that the diffusive process was affected by the energy dissipation of the wetting system. The high viscosity and the strong molecular interaction of EMI-TFSI with the polymer brush gave a large entropy change during the wetting process to result in a slower spreading velocity. |
| Databáze: | OpenAIRE |
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