10-16 June 2018
Dalhousie University
America/Halifax timezone
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Capillary levelling of a liquid stepped film supported on an immiscible liquid film (G)*

13 Jun 2018, 14:15
15m
SUB 302 (cap. 40) (Dalhousie University)

SUB 302 (cap. 40)

Dalhousie University

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) W3-4 Soft matter and molecular dynamic (DPMB/DCMMP) | Matière molle et dynamique moléculaire (DPMB/DPMCM))

Speaker

Carmen Lee (McMaster University)

Description

Thin polymeric films have numerous technological applications and their stability has garnered intense interest. The stability and flow of a thin, viscous film is sensitive to the boundary conditions as the film thickness approaches the nanoscale. Here we probe a liquid-liquid boundary condition: a stepped polymer film is placed above a different, immiscible polymer film. The ensemble is supported by a solid substrate. The temporal evolution of the air-polymer interface, as well as the polymer-polymer interface were studied using atomic force microscopy. The polymer-polymer interface was exposed by using a selective solvent to remove the top film. Experimental results show that the step at the air-polymer interface levels off to minimize the excess surface area, and that there is substantial deformation at the interface between the two polymers during the levelling process. These findings are discussed in light of a developed lubrication model.

Primary authors

Carmen Lee (McMaster University) Vincent Bertin JOHN NIVEN (McMaster University) Dr Thomas Salez (ESPCI Paris) Mr Elie Raphael (ESPCI Paris) Mr Kari Dalnoki-Veress (McMaster University)

Presentation Materials

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