Slip-controlled thin film dynamics

Abstract

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 nm and 230 nm and various temperatures above the glass transition. We find slip lengths from 100 nm up to 1 micron on OTS and between 300 nm and 10 microns on DTS covered silicon wafers. The slip length decreases with temperature. The obtained values for the viscosity are consistent with independent measurements.

4 figures

References in corpus (4)

• Nanorheology : an Investigation of the Boundary Condition at Hydrophobic and Hydrophilic Interfaces
• Static and dynamic properties of the interface between a polymer brush and a melt of identical chains
• Shape of a liquid front upon dewetting
• Generic morphologies of viscoelastic dewetting fronts

Cited by in corpus (8)

• Temperature dependence of the slip length in polymer melts at attractive surfaces
• Statics and dynamics of a cylindrical droplet under an external body force
• Friction of polymers: from PDMS melts to PDMS elastomers
• Statics of polymer droplets on deformable surfaces
• Molecular transport and flow past hard and soft surfaces: Computer simulation of model systems
• Ripples in Thin Films
• Dynamics of nanodroplets on topographically structured substrates
• Rolling ferrofluid drop on the surface of a liquid