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A. A. Yelenskii, B. N. Tarasevich, G. P. Yampol’skaya
Phase State
Determination of Tween-80–Water Binary Mixtures by IR Spectroscopy
Abstract
IR-spectra
(in 4000–600 cm–1 region) of binary mixtures of
nonionic surfactant Tween-80 with water are measured under room temperature and
on wide variation of composition. The goal of this work is to determine the
possibility of application of this technique for estimation the mixture phase
state. Changes in region of O–H stretching vibrations, C–H and C–O–C bonds are
discovered. Analysis of changes in adsorption band of O–H stretching vibrations
(3600–3000 cm–1) allows to establish the stepwise
decrease in the water molecule level, which participate in hydrogen bonds. This
allows us to suppose the formation of new lyotropic phases, which are stable in
concentration range 20–30% (direct) and 40–50% (inverted), with the inversion
point near 35% of Tween-80 content. This conclusion is in an agreement with
rheological data.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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