Smectic block copolymer thin films on corrugated substrates
| Autor: | Aldo Daniel Pezzutti, Daniel A. Vega, Leopoldo Raimundo Gomez |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Mean curvature
Materials science business.industry polymer Ciencias Físicas block copolymer General Chemistry Bending Substrate (electronics) Condensed Matter Physics Curvature Topological defect Astronomía Condensed Matter::Soft Condensed Matter Optics thin films Copolymer Texture (crystalline) Composite material Thin film business CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | Soft matter. 11(14) |
| ISSN: | 1744-6848 |
| Popis: | In this work we study equilibrium and non-equilibrium structures of smectic block copolymer thin films deposited on a topographically patterned substrate. A Brazovskii free energy model is employed to analyze the coupling between the smectic texture and the local mean curvature of the substrate. The substrate´s curvature produces out-of-plane deformations of the block copolymer such that equilibrium textures are modified and dictated by the underlying geometry. For weak curvatures it is shown that the free energy of the block copolymer film follows a Helfrich form, scaling with the square of the mean curvature, with a bending constant dependent on the local pattern orientation. On substrates of varying mean curvature simulations show that topological defects are rapidly expelled from regions with large curvature. These results compare well with available experimental data of poly(styrene) copoly(ethylene-alt-propylene) smectic thin films. Fil: Pezzutti, Aldo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Física del Sur. Universidad Nacional del Sur. Departamento de Física. Instituto de Física del Sur; Argentina Fil: Gomez, Leopoldo Raimundo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Física del Sur. Universidad Nacional del Sur. Departamento de Física. Instituto de Física del Sur; Argentina Fil: Vega, Daniel Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Física del Sur. Universidad Nacional del Sur. Departamento de Física. Instituto de Física del Sur; Argentina |
| Databáze: | OpenAIRE |
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