期刊
ADVANCES IN COLLOID AND INTERFACE SCIENCE
卷 233, 期 -, 页码 155-160出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cis.2015.08.001
关键词
Hydrophobic substrates; Aqueous surfactant solutions; Complete wetting; Interfacial tension; Spreading kinetics; Spreading factor
资金
- Engineering and Physical Sciences Research Council, UK [EP/D077869/1]
- CoWet EU project
- ESA under grant EVAPORATION
- ESA under grant FASES
- ESA under grant PASTA
- COST project [MP1106]
- EPSRC [EP/D077869/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D077869/1, EP/C528557/1] Funding Source: researchfish
Surfactants are broadly used to improve wetting properties of aqueous formulations. The improvement is achieved by essential reduction of liquid/air and solid/liquid interfacial tensions resulting in the decrease of contact angle. For moderately hydrophobic substrates, there is a range of surfactants providing complete wetting of substrate. With the decrease of substrate surface energy, this range of surfactants reduces very quickly and only trisiloxane surfactant solutions are capable to wet completely such highly hydrophobic substrates as polypropylene and parafilm. That is why these surfactants are referred to as superspreaders. The most intriguing feature of wetting surfactant solutions is their ability to spread much faster than pure liquids with spread area, S, being proportional to time, t, S similar to t, as compared to S similar to t(0.2) for pure liquids, which wet completely the solid substrate. Trisiloxane surfactant solutions spread faster than other aqueous surfactant solutions, which also provide complete wetting, being superspreaders in the sense of spreading rate as well. The mechanism of fast spreading of surfactant solutions on hydrophobic substrates and much higher spreading rates for trisiloxane solutions are to be explained. Below the available experimental data on superspreading and surfactant-enhanced spreading are analysed/summarised, and possible mechanisms governing the fast spreading are discussed. (C) 2016 Elsevier B.V. All rights reserved.
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