Langmuir-Blodgett Deposition of a Ring-Shaped Molecule (Valinomycin)

J. B. Peng, B. M. Abraham, P. Dutta*, J. B. Ketterson, H. Frank Gibbard

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Valinomycin, unlike most surfactants, is a ring-shaped molecule; its hydrophilic groups are evenly distributed around the ring. By the Langmuir-Blodgett (LB) technique, a single monolayer of valinomycin can be deposited on withdrawing a (hydrophilic) glass or mica substrate from the subphase, but the contact angle is not appreciably changed by the deposition of this flat molecule. The monolayer then peels off as the substrate is reintroduced into the water. However, if a thin film of silver is first evapoated on the substrate or three monolayers of lead stearate deposited on it, multiple layers of valinomycin can be built up. LB multilayers can also be deposited on poly (methyl methacrylate) (PMMA). Monitoring the actual (dynamic) contact angle during the process of deposition suggests that, for successful LB deposition, the contact angle must be greater than 90° on immersion and less than 90° on withdrawal. For valinomycin this sequence occurs only with substrates whose contact angles are hysteretic even in clean water.

Original languageEnglish (US)
Pages (from-to)104-106
Number of pages3
JournalLangmuir
Volume3
Issue number1
DOIs
StatePublished - Jan 1 1987

ASJC Scopus subject areas

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

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