Origin of contact line forces during the retraction of dilute polymer solution drops.
Langmuir
; 30(19): 5455-9, 2014 May 20.
Article
em En
| MEDLINE
| ID: mdl-24786826
The forced dewetting of water and dilute poly(ethylene oxide) solution (PEO) drops is investigated for syringe-driven flow. Comparisons are made with the free dewetting observed during drop impact. We provide strong evidence that during droplet retraction, polymer deposited on the substrate results in a velocity-dependent force at the contact line. These findings are in stark contrast to previous studies which attributed dissipation to bulk viscoelastic effects or normal stress effects at the contact line.
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MEDLINE
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En
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2014
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Article