Verification of the internal reflection spectroscopy adsorption density equation by Fourier transform infrared spectroscopy analysis of transferred Langmuir-Blodgett films

Recent research has demonstrated the utility of the internal reflection spectroscopy (IRS) adsorption density equation for in situ study of surfactant adsorption phenomena. The IRS adsorption density equation has been examined by several researchers and in one form is [Gamma] = (A/N [minus] = [epsil...

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Bibliographic Details
Published in:Langmuir 1993-11, Vol.9 (11), p.3159-3165
Main Authors: Jang, W. H, Miller, J. D
Format: Article
Language:English
Subjects:
400102 - Chemical & Spectral Procedures
400201 - Chemical & Physicochemical Properties
990200 - Mathematics & Computers
ADSORPTION
CARBOXYLIC ACIDS
Chemistry
ELECTRIC FIELDS
Exact sciences and technology
GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
General and physical chemistry
INFRARED SPECTRA
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MATHEMATICAL MODELS
ORGANIC ACIDS
ORGANIC COMPOUNDS
Solid-liquid interface
SORPTION
SPECTRA
Surface physical chemistry
SURFACTANTS
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Summary:Recent research has demonstrated the utility of the internal reflection spectroscopy (IRS) adsorption density equation for in situ study of surfactant adsorption phenomena. The IRS adsorption density equation has been examined by several researchers and in one form is [Gamma] = (A/N [minus] = [epsilon]C[sub b]d[sub e])/1000[epsilon](2d[sub e]/d[sub p]), where [Gamma] is the adsorption density of adsorbed species, A/N is the absorbance per reflection, [epsilon] is the integrated molar absorptivity, C[sub b] is the bulk concentration of the surfactant, d[sub e] is the effective thickness, and d[sub p] is the depth of penetration. Previously, the validity of the adsorption density equation had only been confirmed from solution depletion measurements using high surface area powders. Now a more direct examination of the IRS adsorption density equation has been completed in our laboratory using a Langmuir-Blodgett (LB) FTIR/IRS technique. Experimental results with LB films of 18C fatty acids transferred to the internal reflection element provide further confirmation o of the validity of the adsorption density equation and thus clearly show that the adsorption density equation can be used, with confidence, for in situ and ex situ studies of surfactant adsorption phenomena. 46 refs., 10 figs., 1 tab.
ISSN:0743-7463
1520-5827
DOI:10.1021/la00035a068