On the effect of pH on spreading of surfactant solutions on hydrophobic surfaces

Jovana Radulovic, K. Sefiane, M. Shanahan

    Research output: Contribution to journalArticlepeer-review


    Surfactants are invaluable in a number of agricultural applications in products such as pesticides and herbicides. In these products, surfactants are very often used in conjunction with acidifiers in order to improve their half-life. In this paper, we investigate how the change in pH affects surfactant wetting and spreading. We compare the performance of a conventional surfactant, Triton® X-100, with that of a trisiloxane superspreader, Silwet® L-77, on a number of polymer coated surfaces exhibiting various degrees of hydrophobicity. Silwet® L-77 in water based solutions showed very good wetting capability on all surfaces. However, its wetting ability was drastically reduced with the addition of acetic acid. On the other hand, Triton® X-100 was not affected by the addition of acid and exhibited the same spreading behaviour as in water-based solutions.
    Original languageEnglish
    Pages (from-to)497-504
    Number of pages8
    JournalJournal of Colloid and Interface Science
    Issue number2
    Publication statusPublished - 15 Apr 2009


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