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Morphology Formation from Ternary Mixtures upon Evaporation: a Square Cell Model Approach
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Morfologiformation från Trekomponentsblandningar under Avdunstning : en Kvadratisk Cellmodellansats (Swedish)
Abstract [en]

We present a novel modelling approach for the morphology formation from ternary mixtures upon evaporation, which takes into consideration two different length scales of the interaction, and further allows for these length scales to be altered. A quantitative study of the interfacial energy hints towards the existence of a mesoscopic regime - further research is needed to verify the validity of this claim however. We also demonstrate that the solvent initially follows a Fickian law of diffusion, then deviates from this behaviour, presumably due to the phase separated regions produced by the two remaining (active) components. We also attempt to bridge the gap between this work and a hypothetical three-dimensional model by considering a top-down view of the system. Here, we observe domain growth dominated by Ostwald ripening, with some coalescence. The domain growth was further characterised using Fourier image analysis.

Abstract [sv]

Vi presenterar en ny modellansats för morfologiformation från trekomponentsblandningar under avdunstning, som tar hänsyn till två olika längdskalor hos interaktionen, samt möjliggör förändring av dessa längdskalor. En kvantitativ studie av energin vid domängränserna tyder på att det finns en mesoskopisk regim - ytterligare forskning är dock nödvändig för att verifiera giltigheten av detta påstående. Vi visar också att lösningsmedlet ursprungligen följer en Fickiansk diffusionslag, för att senare avvika från detta beteende, förmodligen på grund av de tydliga domänerna som produceras av de två återstående (aktiva) komponenterna. Vi försöker också minska klyftan mellan det här arbetet och en hypotetisk tredimensionell modell genom att behandla systemet uppifrån. Här observerar vi domäntillväxt dominerad av 'Ostwald ripening', med viss koalescens. Domäntillväxten karakteriserades vidare med hjälp av Fourier-bildanalys.

Place, publisher, year, edition, pages
2019.
Keywords [en]
Lattice model, Morphology, Ternary mixtures, Monte Carlo method
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:kau:diva-72624OAI: oai:DiVA.org:kau-72624DiVA, id: diva2:1326115
Subject / course
Physics
Educational program
Engineering: Engineering Physics (300 ECTS credits)
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Examiners
Available from: 2019-06-19 Created: 2019-06-17 Last updated: 2019-06-19Bibliographically approved

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CiteExportLink to record
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