Generating Large Thermally Stable Marangoni-Driven Topography in Polymer Films by Stabilizing the Surface Energy Gradient
| Autor: | Heonjoo Ha, Amanda R. Jones, Gregory Blachut, Roger T. Bonnecaze, Christopher J. Ellison, Reika Katsumata, Chae Bin Kim, Sunshine X. Zhou |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Flow (psychology) 02 engineering and technology 010402 general chemistry Thermal diffusivity 01 natural sciences Physics::Fluid Dynamics Inorganic Chemistry Viscosity chemistry.chemical_compound Optics Materials Chemistry Copolymer chemistry.chemical_classification Marangoni effect business.industry Organic Chemistry Polymer 021001 nanoscience & nanotechnology Surface energy 0104 chemical sciences Condensed Matter::Soft Condensed Matter chemistry Chemical physics Polystyrene 0210 nano-technology business |
| Zdroj: | Macromolecules. 50:4588-4596 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | Marangoni forces drive a fluid to flow in response to positional differences in surface energy. In thin polymer films, a difference in surface energy between two coincident liquid polymers could offer a useful route to manufacture topographically patterned surfaces via the Marangoni effect. Previously, we have demonstrated a photochemical method using the Marangoni effect for patterning thin polystyrene films. To generalize the approach, a theoretical model that gives the underlying physics of this process was also developed, which further revealed that low viscosities, low diffusivities, and large surface energy gradients favor rapid evolution of large film thickness variations. However, as described by the Stokes−Einstein equation or the Rouse model, low viscosity is generally correlated with high diffusivity in a single-component system. Herein, we report a strategy to decouple film viscosity and diffusivity by co-casting a high molecular weight surface energy gradient creating copolymer (low diffusivi... |
| Databáze: | OpenAIRE |
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