Journal Article

FZJ-2021-04880

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Two-dimensional Cahn–Hilliard simulations for coarsening kinetics of spinodal decomposition in binary mixtures

König, B.FZJ* ; Ronsin, O. J. J.FZJ* ; Harting, J. (Corresponding author)FZJ*

2021
RSC Publ. Cambridge

This record in other databases:      

Please use a persistent id in citations: http://hdl.handle.net/2128/29296  doi:10.1039/D1CP03229A

Abstract: The evolution of the microstructure due to spinodal decomposition in phase separated mixtures has astrong impact on the final material properties. In the late stage of coarsening, the system ischaracterized by the growth of a single characteristic length scale LBCta. To understand thestructure–property relationship, the knowledge of the coarsening exponent aand the coarsening rateconstant Cis mandatory. Since the existing literature is not entirely consistent, we perform phase fieldsimulations based on the Cahn–Hilliard equation. We restrict ourselves to binary mixtures using asymmetric Flory–Huggins free energy and a constant composition-independent mobility term and showthat the coarsening for off-critical mixtures is slower than the expected t1/3-growth. Instead, we find atobe dependent on the mixture composition and associate this with the observed morphologies. Finally,we propose a model to describe the complete coarsening kinetics including the rate constant C.

---

Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IEK-11)

Research Program(s):

1. 1215 - Simulations, Theory, Optics, and Analytics (STOA) (POF4-121) (POF4-121)
2. DFG project 449539983 - Prozess-Struktur Relationen für die lösungsmittelbasierte organische Photovoltaik (449539983)

Appears in the scientific report 2021

---

Database coverage:
; ; ; Allianz-Lizenz / DFG ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---