Probing molecular ordering at a liquid-solid interface with a magnetically oscillated atomic force microscope
- 30 March 1998
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 72 (13) , 1656-1658
- https://doi.org/10.1063/1.121143
Abstract
We have demonstrated the ability of an atomic force microscope operated in the magnetic a/c mode to determine the layered structure of liquids at interfaces with high accuracy and reproducibility. Oscillations in surface stiffness were found for octamethylcyclotetrasiloxane (OMCTS) and mesitylene close to a graphite surface and the period of oscillation allowed us to determine the molecular packing to sub-Angstrom precision. The Young’s modulus, measured at the peak stiffness of each layer, decreased exponentially with distance from the interface with a decay length of 8.8 Å for OMCTS and 6.5 Å for mesitylene.Keywords
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