Determination of the Viscosity of Valinomycin Monolayers as a Function of Surface Density and a Comment on Conformation

B. M. Abraham*, J. B. Ketterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The surface viscosity of valinomycin spread on aqueous substrates buffered to pH 6.7 ±0.1 with trisphosphate has been determined over the surface pressure range 7–30 dyn/cm (area 360–160 Å2/molecule). Four series of measurements were made: buffer alone, buffer with 0.1 M NaCl, and buffer with 0.1 M and 1 M KCl. The surface viscosity remained essentially constant at 1.8 (mdyn s)/cm over the entire compressional range, regardless of the presence of Na+or K+. Apparently, the polar groups do not form an intermolecular network by hydrogen bonding as the polar groups of lecithin or the fatty alcohols appear to do. The surface pressure-molecular area diagrams (II-A) in all cases, with and without Na+ or K+ ions in the water, are monotonic and nearly identical. None of the diagrams display a signature that can be attributed to either a phase change, a conformation change, or a unique molecular area. It is concluded that all monolayers studied in this research had essentially the same conformation.

Original languageEnglish (US)
Pages (from-to)461-464
Number of pages4
JournalLangmuir
Volume1
Issue number4
DOIs
StatePublished - Jan 1 1985

ASJC Scopus subject areas

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

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