AFM forces measured between gold surfaces coated with self-assembled monolayers of 1-hexadecanethiol.

摘要: An atomic force microscope (AFM) was used to measure the forces between gold surfaces with and without hydrophobizing them by self-assembly of 1-hexadecanethiol. The measured bare were fitted Derjaguin−Landau−Verwey−Overbeek (DLVO) theory a Hamaker constant 1.2 × 10−20 J, which close value determined using methylene iodide contact angle method but lower than that calculated Lifshitz theory. When hydrophobized in 0.01 mM thiol-in-ethanol solution for 10 min, exhibited long-range decay length 35 nm. Despite its high water (105°), curve smooth no steps. 1 thiol longer 6 h, however, curves steps, indicating attractions caused bridging bubbles. measurements conducted after washing substrates organic solve...