Issue |
Europhys. Lett.
Volume 75, Number 4, August 2006
|
|
---|---|---|
Page(s) | 638 - 644 | |
Section | Interdisciplinary physics and related areas of science and technology | |
DOI | https://doi.org/10.1209/epl/i2006-10160-3 | |
Published online | 19 July 2006 |
Slip-controlled thin-film dynamics
1
Department of Experimental Physics, Saarland University 66123 Saarbrücken, Germany
2
Max-Planck-Institut für Metallforschung - Heisenbergstr. 3 70569 Stuttgart, Germany
3
ITAP, University of Stuttgart - Pfaffenwaldring 57, 70569 Stuttgart, Germany
4
Institute of Mathematics, Humboldt University Berlin - 10099 Berlin, Germany
5
Weierstrass Institute for Applied Analysis and Stochastics Mohrenstr. 39, 10117 Berlin, Germany
Received:
13
March
2006
Accepted:
4
July
2006
In this study, we present a novel method to assess the slip length
and the viscosity of thin films of highly viscous Newtonian liquids.
We quantitatively analyse dewetting fronts of low-molecular-weight
polystyrene melts on octadecyl- (OTS) and dodecyltrichlorosilane
(DTS) polymer brushes. Using a thin-film (lubrication) model derived
in the limit of large slip lengths, we can extract slip length and
viscosity. We study polymer films with thicknesses between 50
and 230
and various temperatures above the glass transition.
We find slip lengths from 100
up to 1
on OTS- and
between 300
and 10
on DTS-covered silicon wafers.
The slip length decreases with temperature. The obtained values for
the viscosity are consistent with independent measurements.
PACS: 83.80.Sg – Polymer melts / 47.15.gm – Thin film flows / 83.50.Lh – Slip boundary effects (interfacial and free surface flows)
© EDP Sciences, 2006
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