COLL 106 |
| Natascha Bunjes, Max-Planck Institut für Metallforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany, George W. Tyndall, IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, and Mark H. Sherwood, Center for Polymeric Interfaces and Macromolecular Assemblies, IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120. |
| The viscoelastic properties of the perfluoropolyether films under confinement depend not only on the intrinsic properties of the chosen backbone and functional groups of the polymer chain, but strongly interact with the underlying interfaces. The evolution of the film instability during spreading and the subsequent pattern formation of ultra thin PFPE films (<20 nm) on amorphous carbon coatings ranging from 1-10 nm were investigated by imaging ellipsometry. Measurements have not only identified a surface dependent critical film thickness which defines the spreading velocity of the lubricant but also a variety of microstructures in the ultra-thin films ranging from microdroplets to holes, as well as a spectrum of bicontinuousstructures. For carbon coatings less than 4 nm the underlying interface will strongly effect the PFPE film formation and stability which strongly modifies the wetting behavior. |
|
Symposium in Memory of Arthur W. Adamson
8:30 AM-11:50 AM, Monday, March 29, 2004 Marriott -- Orange County 4, Oral
Division of Colloid and Surface Chemistry |