Role of Bénard-Marangoni Instabilities during Solvent Evaporation in Polymer Surface Corrugations

Film formation through the drying of polymer solutions is a widely used process in laboratories and in many industrial applications such as coatings. One of the main goals of these applications is to control the film surface morphology. In many cases, evaporation has been found to yield corrugated p...

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Bibliographic Details
Published in:Langmuir 2009-01, Vol.25 (1), p.624-632
Main Authors: BASSOU, N, RHARBI, Y
Format: Article
Language:English
Subjects:
Chemical Sciences
Chemistry
Colloidal state and disperse state
Condensed Matter
Exact sciences and technology
General and physical chemistry
Physics
Polymers
Soft Condensed Matter
Surface physical chemistry
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Summary:Film formation through the drying of polymer solutions is a widely used process in laboratories and in many industrial applications such as coatings. One of the main goals of these applications is to control the film surface morphology. In many cases, evaporation has been found to yield corrugated patterns on the free surface of films. This has been interpreted in terms of either mechanical or hydrodynamic instabilities. In this article, we present experimental results where mesoscale 2D well-ordered surface corrugation patterns are formed during solvent evaporation from polystyrene/toluene solutions. The transformation of Benard-Marangoni instabilities into surface corrugation is studied during the entire drying process using particle tracking, 3D morphology analyses, etc. We show that the corrugation wavelength is controlled by the Benard-Marangoni instability, whereas the corrugation amplitude is controlled by a mechanism that involves a high evaporation rate.
ISSN:0743-7463
1520-5827
DOI:10.1021/la802979a