Mesoscopic patterning in evaporated polymer solutions: New experimental data and physical mechanisms

Edward Bormashenko; Roman Pogreb; Oleg Stanevsky; Yelena Bormashenko; Tamir Stein; Oleg Gengelman

doi:10.1021/la0518492

Mesoscopic patterning in evaporated polymer solutions: New experimental data and physical mechanisms

Edward Bormashenko, Roman Pogreb, Oleg Stanevsky, Yelena Bormashenko, Tamir Stein, Oleg Gengelman

Research output: Contribution to journal › Article › peer-review

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Abstract

Mesoscopically ordered patterns were obtained when polymer solutions were applied to tilted substrates and evaporated immediately under ambient conditions in a slow air current. The patterns were studied with optical, scanning electron, and atomic force microscopy. Shadowgraph visualization of the patterning was carried out, and visualization of the flow with an ink tracer was performed. Restrained and nonrestrained flows of the polymer solution gave rise to very similar patterning. The formation of the patterns on different solid substrates, including substrates wetted with silicon oil, was investigated. The concentration of the polymer solutions exerted an influence on the characteristic dimension of mesoscaled cells. A physical mechanism of the patterning is proposed. The mechanism is based on the mass transport instability occurring under the intensive evaporation of the solvent. The model satisfactorily explains the experimental findings.

Original language	English
Pages (from-to)	9604-9609
Number of pages	6
Journal	Langmuir
Volume	21
Issue number	21
DOIs	https://doi.org/10.1021/la0518492
State	Published - 11 Oct 2005

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AU - Bormashenko, Edward

AU - Pogreb, Roman

AU - Stanevsky, Oleg

AU - Bormashenko, Yelena

AU - Stein, Tamir

AU - Gengelman, Oleg

PY - 2005/10/11

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AB - Mesoscopically ordered patterns were obtained when polymer solutions were applied to tilted substrates and evaporated immediately under ambient conditions in a slow air current. The patterns were studied with optical, scanning electron, and atomic force microscopy. Shadowgraph visualization of the patterning was carried out, and visualization of the flow with an ink tracer was performed. Restrained and nonrestrained flows of the polymer solution gave rise to very similar patterning. The formation of the patterns on different solid substrates, including substrates wetted with silicon oil, was investigated. The concentration of the polymer solutions exerted an influence on the characteristic dimension of mesoscaled cells. A physical mechanism of the patterning is proposed. The mechanism is based on the mass transport instability occurring under the intensive evaporation of the solvent. The model satisfactorily explains the experimental findings.

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Mesoscopic patterning in evaporated polymer solutions: New experimental data and physical mechanisms

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