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Title: Mixtures of catanionic surfactants can be superspreaders: Comparison with trisiloxane superspreader
Authors: Kovalchuk, Nina
Barton, Alix
Trybala, Anna
Starov, Victor
Keywords: Sodium alkane sulphonates
Interfacial tension
Spreading kinetics
Spreading factor
Polyethylene substrate
Effect of humidity
Issue Date: 2015
Publisher: © Elsevier
Citation: KOVALCHUK, N. ...et al., 2015. Mixtures of catanionic surfactants can be superspreaders: Comparison with trisiloxane superspreader. Journal of Colloid and Interface Science, 459, pp. 250-256.
Abstract: © 2015 Elsevier Inc.Hypothesis: Mixed solutions of cationic and anionic surfactants show considerable synergism in their wetting behaviour, but their spreading is affected considerably by the phase separation processes. The valuable information about wetting properties of synergetic mixtures can be obtained by using mixtures in which phase separation occurs at concentrations above cmc. Experiments: Spreading properties of mixed solutions of cationic and anionic surfactants over highly hydrophobic substrate such as polyethylene are investigated and compared with those for trisiloxane superspreader. Experiments are performed at relative humidity of 40% and 80%. Interfacial tension at water/air and water/alkane interfaces is measured to explain spreading performance. Findings: Catanionic solutions can wet hydrophobic substrates nearly as effective as solutions of trisiloxane superspreader. The spreading factor reaches 70% of that of superspreader for the most effective mixed solution. The spreading slows down earlier at high surfactant concentrations. At room humidity (40%) spread area has a maximum vs concentration. However, the maximum was not observed at higher humidity 80%. Humidity does not affect the short-time spreading rate, but it influences considerably the time when spreading slows down. The spreading rate of mixed solutions is smaller than that of superspreader despite the same spreading exponent α= 0.5.
Description: This paper was accepted for publication in the journal Journal of Colloid and Interface Science and the definitive published version is available at http://dx.doi.org/10.1016/j.jcis.2015.08.024
Sponsor: This research was supported by Engineering and Physical Sciences Research Council, UK, grant EP/D077869/1; by CoWet Marie Curie, EU project; by European Space Agency, MAP, FASES and PASTA projects; and by COST MP1106 EU project.
Version: Accepted for publication
DOI: 10.1016/j.jcis.2015.08.024
URI: https://dspace.lboro.ac.uk/2134/24222
Publisher Link: http://dx.doi.org/10.1016/j.jcis.2015.08.024
ISSN: 0021-9797
Appears in Collections:Published Articles (Chemical Engineering)

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