Interaction forces between hydrophobic and hydrophilic self-assembled monolayers

Efrosini Kokkoli, Charles F. Zukoski

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45 Scopus citations


An investigation is presented of the interaction of charged self-assembled monolayers (SAMs) with a monoprotic ionizable acid functional group (-COOH) and uncharged SAMs with a methyl terminated functional group (-CH3). The strength of the interactions are determined using an atomic force microscope. For all electrolyte conditions investigated the interactions are not well described by a summation of van der Waals attractions and electrostatic repulsions in a manner suggesting that van der Waals attractions are screened. The repulsions are accurately described as corresponding to two surfaces of different charge interacting with surface charges that are independent of separation (i.e., the constant charge model). A small adhesion force was observed under all conditions and its magnitude increased with NaCl concentration. (C) 2000 Academic Press.

Original languageEnglish (US)
Pages (from-to)176-180
Number of pages5
JournalJournal of Colloid And Interface Science
Issue number1
StatePublished - Oct 1 2000

Bibliographical note

Funding Information:
We thank the Beckman Imaging Technology Group. This work was supported by NASA under Grant NAG8–1376.


  • Atomic force microscope
  • Dissimilar surfaces
  • Hydrophilic surface
  • Hydrophobic surface
  • Self-assembled monolayers
  • Surface forces

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