Modeling the interplay between solvent evaporation and phase separation dynamics during membrane

Manzanarez, H.; Méricq, J.P.; Guénoun, P.; Bouyer, Denis

doi:10.1016/j.memsci.2020.118941

Cited by 11 publications

(8 citation statements)

References 41 publications

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“…19,22 . This also includes the characterization using Minkowski descriptors as proposed by Manzanarez et al 16,79 . Furthermore, we plan to investigate asymmetric material systems in near future, as well as systems with more sophisticated mobility functions in order to extend, confirm and enrich the results on the coarsening behavior of binary blends.…”

Section: Discussionmentioning

confidence: 99%

Two-dimensional Cahn–Hilliard simulations for coarsening kinetics of spinodal decomposition in binary mixtures

König

Ronsin

Harting

2021

Phys. Chem. Chem. Phys.

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Section: Discussionmentioning

confidence: 99%

Two-dimensional Cahn–Hilliard simulations for coarsening kinetics of spinodal decomposition in binary mixtures

König

Ronsin

Harting

2021

Phys. Chem. Chem. Phys.

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“…19,22 . This also includes the characterization using Minkowski descriptors as proposed by Manzanarez et al 16,63 . Furthermore, we plan to investigate asymmetric material systems in near future, as well as systems with more sophisticated mobility functions in order to extend, confirm and enrich the results on the coarsening behavior of binary blends.…”

Section: Discussionmentioning

confidence: 99%

Two-dimensional Cahn-Hilliard simulations for coarsening kinetics of spinodal decomposition in binary mixtures

König,

Ronsin,

Harting

2021

Preprint

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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 ∼ Ct α . To understand the structure-property relationship, the knowledge of the coarsening exponent α 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 α 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.

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“…[21] The initial temperature of the polymer solution must be higher than the melting point or glass transition temperature of the polymer and lower than the boiling point of the solvent to induce phase separation via spinodal decomposition. [6,15,[22][23][24] The structure is frozen, and the solvent is extracted after the system phase separates into polymer-rich and polymer-lean phases. [7] Depending on the temperature and concentration ranges, liquidliquid phase separation can be accomplished through two major pathways to induce phase separation in the metastable or unstable regions of the phase diagram into nucleation and growth and spinodal decomposition, respectively.…”

Section: Introductionmentioning

confidence: 99%

Morphology formation during the nonisothermal thermally‐induced phase separation (TIPS) process

Ranjbarrad

Chan

2023

Can J Chem Eng

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In high‐viscosity polymer solutions and blends, temperature variations during the quench process of the thermally‐induced phase separation (TIPS) influence the dynamics and thermodynamics of phase separation. Hence, this study aims to investigate the impact of temperature variations on the morphology formation during the TIPS process. First, the influence of temporal temperature variations on phase separation is investigated by coupling a transient heat conduction model and the Cahn–Hilliard equation, and the results are compared with the isothermal phase separation process. Next, the morphology formation during phase separation is inspected by applying quench from two opposite sides of the sample to the same and different temperatures through coupling the Fourier heat transfer equation and the Cahn–Hilliard equation. The influence of the enthalpy of demixing on the morphology formation and the competition between the heat and mass transfer is also evaluated. It is confirmed that temporal variations of temperature alone have a significant impact on the morphology formation during the TIPS process. In addition, quenching the system to the same and different temperatures both leads to anisotropic morphology formation, which is affected by the quench rate, quench temperature, solution viscosity, and enthalpy of demixing. Upon applying different quench temperatures from opposite sides, two different types of morphologies and droplet sizes were formed as a result of the difference in the cooling rates between the two sides. Employing the enthalpy of demixing during phase separation induced a shallow quench effect on the deep quench side due to the fact that the heat moved toward the lowest temperature in the system, which led to the formation of a distinctive structure.

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Modeling the interplay between solvent evaporation and phase separation dynamics during membrane

Cited by 11 publications

References 41 publications

Two-dimensional Cahn–Hilliard simulations for coarsening kinetics of spinodal decomposition in binary mixtures

Two-dimensional Cahn–Hilliard simulations for coarsening kinetics of spinodal decomposition in binary mixtures

Two-dimensional Cahn-Hilliard simulations for coarsening kinetics of spinodal decomposition in binary mixtures

Morphology formation during the nonisothermal thermally‐induced phase separation (TIPS) process

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