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  Capillary leveling of stepped films with inhomogeneous molecular mobility

McGraw, J. D., Salez, T., Bäumchen, O., Raphaël, É., & Dalnoki-Veress, K. (2013). Capillary leveling of stepped films with inhomogeneous molecular mobility. Soft Matter, 9(34), 8297-8305. doi:10.1039/C3SM50520K.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-767F-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-7680-2
Genre: Journal Article

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 Creators:
McGraw, Joshua D.1, Author
Salez, Thomas1, Author
Bäumchen, Oliver2, Author              
Raphaël, Élie1, Author
Dalnoki-Veress, Kari1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Group Dynamics of fluid and biological interfaces, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063300              

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 Abstract: A homogeneous thin polymer film with a stepped height profile levels due to the presence of Laplace pressure gradients. Here we report on studies of polymeric samples with precisely controlled, spatially inhomogeneous molecular weight distributions. The viscosity of a polymer melt strongly depends on the chain length distribution; thus, we learn about thin-film hydrodynamics with viscosity gradients. These gradients are achieved by stacking two films with different molecular weights atop one another. After a sufficient time these samples can be well described as having one dimensional viscosity gradients in the plane of the film, with a uniform viscosity normal to the film. We develop a hydrodynamic model that accurately predicts the shape of the experimentally observed self-similar profiles. The model allows for the extraction of a capillary velocity, the ratio of the surface tension and the viscosity, in the system. The results are in excellent agreement with capillary velocity measurements of uniform mono- and bi-disperse stepped films and are consistent with bulk polymer rheology.

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Language(s): eng - English
 Dates: 2013-06-212013
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1039/C3SM50520K
BibTex Citekey: mcgraw-sm-2013
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Title: Soft Matter
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 9 (34) Sequence Number: - Start / End Page: 8297 - 8305 Identifier: ISSN: 1744-683X
CoNE: /journals/resource/1744-683X