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Proceedings Paper

Near-infrared microscope technique for obtaining quantitative and qualitative aqueous surfactant phase-diagram information from a single sample preparation
Author(s): Curtis A. Marcott; Richard L. Munyon; Robert G. Laughlin
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Paper Abstract

A technique for studying the phase behavior of aqueous surfactant systems using near-infrared (NIR) microspectroscopy has been developed. All the phases which exist along a particular isotherm are formed by creating an interface between water and surfactant within a long (55 mm) 25-micrometers pathlength fused silica cell, and allowing the components to diffuse together. The temperature of the cell is controlled to within 0.1 degree(s)C between 25 and 85 degree(s)C. Analysis of the entire composition range is achieved using a Fourier transform infrared (FT- IR) spectrometer equipped with a CaF2 beam splitter, a tungsten-halogen source, and an infrared microscope with a InSb detector. The intensity of the water bend-stretch combination band at 5175 cm-1 is shown to be useful for quantitation. A study of the octyldimethylphosphine oxide/water system illustrates the quantitative potential of this technique.

Paper Details

Date Published: 1 March 1992
PDF: 2 pages
Proc. SPIE 1575, 8th Intl Conf on Fourier Transform Spectroscopy, (1 March 1992); doi: 10.1117/12.56494
Show Author Affiliations
Curtis A. Marcott, Procter & Gamble Co. (United States)
Richard L. Munyon, Procter & Gamble Co. (United States)
Robert G. Laughlin, Procter & Gamble Co. (United States)


Published in SPIE Proceedings Vol. 1575:
8th Intl Conf on Fourier Transform Spectroscopy

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