An atomic force microscope was used to measure forces between self- assembled monolayers (SAMs) of hexadecanethiol as a function of solvent type. Solvents alter interactions between surfaces by changing the wetting properties of the surface. Adhesive forces decrease with solvent dielectric constant and vary monotonically for mixtures of water and ethanol, ethanol and methanol, and water and ethylene glycol. This study demonstrates that interactions and adhesion between hydrophobic SAMs can be manipulated through changes in the contact angle of the surface.
Bibliographical noteFunding Information:
We thank the Beckman Imaging Technology Group for the use of their Microscopy Suite Facility and the Center for Microanalysis of Materials for the use of their evaporator. This work was supported by NASA under Grant NAG8-1376, the Xerox Corporation, and the New Energy and Industrial Technology Development Organization on Integration of Materials by Solution Methods: Assembly at Reduced Temperatures.
- Atomic force microscope
- Self-assembled monolayers
- Wetting properties