Ion adsorption and ion exchange in ultrathin films of fatty acids

Dong June Ahn, Elias I. Franses

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Ion exchange equilibria of ultrathin Langmuir and Langmuir-Blodgett films of stearic and arachidic acids in contact with aqueous electrolyte solutions were studied experimentally and theoretically. A model considering electrochemical and thermodynamic aspects of the adsorption of protons, calcium, and cadmium ions from solution to the film has been developed. Key parameters are the binding constants (K's) of ions and the mixing characteristics (or Flory-Huggins interaction parameters χ's) of ions in the two-dimensional film lattice plane. The ternary system can be described by the parameter values determined with binary proton-calcium ion, proton-cadmium ion, and calcium-cadmium ion systems: KCa = 2.9 × 102, KCd = 8.6 × 103, KH = 3.6 × 106, χH-Ca = -0.76, χH-Cd = 0.13, and χCa-Cd = 1.0. Competitive ion adsorption was measured by FTIR ATR spectroscopy of either collapsed or ordered LB films. Data for the proton-calcium-cadmium ion system agreed well with the model predictions. The results show possible future applications of such thin films as ion sensors or ion exchange materials.

Original languageEnglish
Pages (from-to)1046-1054
Number of pages9
JournalAICHE Journal
Volume40
Issue number6
Publication statusPublished - 1994 Jun 1
Externally publishedYes

Fingerprint

Ultrathin films
Ion Exchange
Fatty acids
Adsorption
Ion exchange
Fatty Acids
Ions
Cadmium
Protons
Calcium
Langmuir Blodgett films
Eicosanoic Acids
Stearic Acids
Fourier Transform Infrared Spectroscopy
Ternary systems
Thermodynamics
Contacts (fluid mechanics)
Electrolytes
Spectrum Analysis
Spectroscopy

ASJC Scopus subject areas

  • Engineering(all)
  • Biotechnology

Cite this

Ion adsorption and ion exchange in ultrathin films of fatty acids. / Ahn, Dong June; Franses, Elias I.

In: AICHE Journal, Vol. 40, No. 6, 01.06.1994, p. 1046-1054.

Research output: Contribution to journalArticle

Ahn, DJ & Franses, EI 1994, 'Ion adsorption and ion exchange in ultrathin films of fatty acids', AICHE Journal, vol. 40, no. 6, pp. 1046-1054.
Ahn, Dong June ; Franses, Elias I. / Ion adsorption and ion exchange in ultrathin films of fatty acids. In: AICHE Journal. 1994 ; Vol. 40, No. 6. pp. 1046-1054.
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