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Title: Equilibrium and dynamic surface properties of trisiloxane aqueous solutions. Part 2. Theory and comparison with experiment
Authors: Ritacco, Hernan
Fanerman, Valentin B.
Ortega, Francisco
Rubio, Ramon
Ivanova, Natalia A.
Starov, Victor
Keywords: Equilibrium and dynamic surface tension
Aggregation
Issue Date: 2010
Publisher: © Elsevier
Citation: RITACCO, H.A. ... et al, 2010. Equilibrium and dynamic surface properties of trisiloxane aqueous solutions. Part 2. Theory and comparison with experiment. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 365 (1-3), pp. 204-209.
Abstract: In the first part of this paper we presented experimental results, which shows the presence of surface aggregates in aqueous solutions of trisiloxane surfactants (Ritacco et al. [1]). Formation of those aggregates has been found for those trisiloxanes (T6, T7, T8, and T9), which show superspreading behaviour at room temperature. However, the formation of surface aggregates has not been detected for trisiloxanes (T4 and T5), which do not show superspreading behaviour at room temperature. It is shown that experimental results on equilibrium and dynamic interfacial tension agree well with a combined theoretical model, which is based on reorientation (or two states) and aggregation models. According to the reorientation model there are two states of trisiloxane molecules on the surface layer: molecules in those two states occupy different surface areas. The aggregation model was modified to account for specific properties of trisiloxane molecules. According to that model molecules occupying the lowest area on the interface can form two-dimensional aggregates. It was assumed that trisiloxane molecules include two kinetically independent trimethylsilyl [–O–Si(CH3)3] groups. This assumption allowed us to agree the aggregation theoretical model and experimental data on ellipsometric measurement of adsorption.
Version: Accepted for publication
DOI: 10.1016/j.colsurfa.2010.01.052
URI: https://dspace.lboro.ac.uk/2134/6611
Publisher Link: http://hdl.handle.net/10.1016/j.colsurfa.2010.01.052
ISSN: 0927-7757
Appears in Collections:Published Articles (Chemical Engineering)

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