| Autor: |
König, Björn, Ronsin, Olivier J. J., Harting, Jens |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Phys. Chem. Chem. Phys., 2021,23, 24823-24833 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1039/D1CP03229A |
| Popis: |
The evolution of the microstructure due to spinodal decomposition in phase separated mixtures has a strong impact on the final material properties. In the late stage of coarsening, the system is characterized by the growth of a single characteristic length scale $L\sim C t^{\alpha}$. To understand the structure-property relationship, the knowledge of the coarsening exponent $\alpha$ and the coarsening rate constant $C$ is mandatory. Since the existing literature is not entirely consistent, we perform phase field simulations based on the Cahn-Hilliard equation. We restrict ourselves to binary mixtures using a symmetric Flory-Huggins free energy and a constant mobility term and show that the coarsening for off-critical mixtures is slower than the expected $t^{1/3}$-growth. Instead, we find $\alpha$ to be dependent on the mixture composition and thus from the morphology. Finally, we propose a model to describe the complete coarsening kinetics including the rate constant $C$. |
| Databáze: |
arXiv |
| Externí odkaz: |
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