Emersion of 11-mercapto-1-undecanol-modified Ag substrates from aqueous and nonaqueous solvents: The effect of emersion velocity on emersed solvent layer thickness

Domenic J. Tiani, Jeanne E. Pemberton

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

The formation and stabilization of the emersed interface is dependent on the interplay of various hydrodynamic (viscosity, emersion velocity) and intermolecular forces (hydrogen bonding, dipole-dipole). In an effort to better define the role of these forces, manual-null ellipsometry has been used to investigate the effect of emersion velocity on the emersed layer thickness of water, methanol, acetonitrile, chloroform, 1-butanol, and 1-pentanol at self-assembled monolayers of 11-mercapto-1-undecanol (11-MUD) on polycrystalline Ag substrates. Emersed solvent layer thicknesses decrease as emersion velocity increases for water, methanol, acetonitrile, and chloroform. In contrast, the emersed layer thicknesses of 1-butanol and 1-pentanol remain relatively constant as the emersion velocity increases over the range of velocities accessible (0.0055-0.037 cm/s). These data suggest that the effect of emersion velocity on the resulting emersed layer thickness depends on the chemical and physical characteristics of the solvent. A descriptive model has been developed to describe the emersion process in terms of the interplay between hydrodynamic and intermolecular forces. According to this model, a shear plane develops at some distance away from the solid surface when the hydrodynamic forces are great enough to overcome the intermolecular forces between the liquid layers that behave as a Newtonian fluid at the molecular level.

Original languageEnglish (US)
Pages (from-to)6422-6429
Number of pages8
JournalLangmuir
Volume19
Issue number16
DOIs
StatePublished - Aug 5 2003

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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