The properties of confined liquids are of fundamental interest for understanding the limitations of conventional continuum hydrodynamics on small scales. In this article we present accurate measurements of oscillatory solvation forces that arise due to confinement of octamethylcyclotetrasiloxane between an AFM tip and a highly oriented pyrolytic graphite (HOPG) surface. To measure these forces the cantilever was driven at a very small amplitude (<<1 nm) with a home-built cantilever holder. We discuss several models that can be used to extract conservative and dissipative forces from the amplitude and phase distance curves.
|Journal||Microscopy and analysis (UK Edition)|
|Publication status||Published - 2009|
- interaction forces
- atomic force spectroscopy
- dynamic cantilever response
- Scanning probe microscopy