The adhesive properties of pyridine-terminated self-assembled monolayers

Bowen, James; Manickam, Mayandithevar; Iqbal, Parvez; Evans, Stephen D.; Critchley, Kevin; Preece, Jon A. and Kendall, Kevin (2009). The adhesive properties of pyridine-terminated self-assembled monolayers. Thin Solid Films, 517(13) pp. 3806–3812.

DOI: https://doi.org/10.1016/j.tsf.2009.01.093

Abstract

The atomic force microscopy (AFM) adhesion force behaviour and contact angle titration behaviour of self-assembled monolayers (SAMs) presenting surface pyridine and substituted pyridine moieties has been investigated as a function of pH and electrolyte concentration. The pK_as of the pyridine moieties were modified through the incorporation of fluorine, chlorine and bromine substituents in the pyridyl ring. Contact angle titration and AFM adhesion force measurements were performed using aqueous phosphate buffered saline solutions over the pH range 3–9, and at concentrations of 150 mM and 0.1 mM. AFM adhesion force measurements were performed using a clean Si₃N₄ pyramidal-tipped AFM cantilever.

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