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Stability of Aqueous Films During Application and Drying
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
2018 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Vattenburna filmers stabilitet under applicering och torkning (Swedish)
Abstract [en]

Wet film deposition is a key process in glazing industry but is not fully understood. The present work explores how the stability of aqueous films of surfactants deposited onto glass substrates is impacted by surfactant chemistry and evaporation. Aqueous solutions of surfactants were blade coated into thin films of 10 to 100 μm, that were monitored during drying.Remarkably, both fast dewetting and self-healing properties were observed. Surfactant chemistry,concentration and relative humidity during drying step appear as key parameters. A plausible mechanism based on the measured physical and chemical properties of the surfactant solutions is suggested. Adsorption of surfactants to the substrate and Marangoni flows could govern the observed phenomena.

Abstract [sv]

Våt beläggning är en nyckelprocess i glasindustrin men är inte helt förstådd. Det föreliggande arbetet undersöker hur stabiliteten hos vattenhaltiga filmer av ytaktiva ämnen avsatta på glassubstrat påverkas av surfaktantkemi och avdunstning. Vattenhaltiga lösningar av ytaktiva medel var bladbelagda i tunna filmer med 10 till 100 μm, som studerades under torkningssteget. Anmärkningsvärt observerades både snabb dewetting och självläkande egenskaper. Surfaktantkemi, koncentration och relativ fuktighet under torkningssteget framträder som nyckelparametrar. En trolig mekanism baserad på de uppmätta fysikaliska och kemiska egenskaperna hos ytaktiva lösningarna föreslås. Adsorption av ytaktiva ämnen till substratet och Marangoni-flöden kan styra de observerade fenomenen.

Place, publisher, year, edition, pages
2018. , p. 35
Keywords [en]
wet film deposition, glazing industry, dewetting, surfactant, Marangoni flow
National Category
Textile, Rubber and Polymeric Materials
Identifiers
URN: urn:nbn:se:kth:diva-259620OAI: oai:DiVA.org:kth-259620DiVA, id: diva2:1352555
External cooperation
CNRS
Educational program
Master of Science in Engineering - Engineering Chemistry
Supervisors
Examiners
Available from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-09-19Bibliographically approved

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