Adhesional stability of cadmium arachidate Langmuir-Blodgett layers

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2 Citations (Scopus)

Abstract

Two-layer Langmuir-Blodgett films of cadmium arachidate were deposited onto hydrophobic glass plates. The adhesional stability of the films has been studied by wetting tension measurements, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). Partial detachment of the Langmuir-Blodgett layer while immersing the plate repeatedly into water or aqueous electrolyte solutions was deduced from the increase in the wettability and the decrease in the surface tension of the immersion liquid. Surface coverages obtained from XPS data and shown by AFM images are in agreement with the expectation based on tensiometric measurements of arachidate release from the substrate. AFM investigations revealed a distinct difference in the structure of the layer depending on whether water or an aqueous solution of NaCl and CaCl2 was applied in the stability test, providing evidence for the dissolution or the detachment type of the removal of the Langmuir-Blodgett film. The contact of a sessile droplet with the Langmuir-Blodgett film induced no detectable change in the contact angle or the surface tension of the liquid, demonstrating the role of a moving contact line in the degradation of the Langmuir-Blodgett film.

Original languageEnglish
Pages (from-to)127-133
Number of pages7
JournalProgress in Colloid and Polymer Science
Volume125
DOIs
Publication statusPublished - Dec 10 2004

Keywords

  • Adhesional stability
  • Atomic force microscopy
  • Cadmium arachidate
  • Langmuir-Blodgett films
  • Wettability

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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