Starov_JCIS-S-15-02211.pdf (369.13 kB)
Mixtures of catanionic surfactants can be superspreaders: Comparison with trisiloxane superspreader
journal contribution
posted on 2017-02-24, 11:20 authored by Nina Kovalchuk, Alix Barton, Anna TrybalaAnna Trybala, Victor Starov© 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.
Funding
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.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Published in
Journal of Colloid and Interface ScienceVolume
459Pages
250 - 256Citation
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.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2015Notes
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.2015.08.024ISSN
0021-9797eISSN
1095-7103Publisher version
Language
- en