Critical wetting concentrations of trisiloxane surfactants

Natalia Ivanova, Victor Starov, Ramon Rubio, Hernán Ritacco, Nidal Hilal, Daniel Johnson

    Research output: Contribution to journalArticle

    Abstract

    Trisiloxane surfactants also known as "superspreaders" are characterized by a critical wetting concentration (CWC) which has been determined by Svitova et al [T. Svitova, R.M. Hill, Y. Smirnova, A. Stuermer, G. Yakubov, Langmuir 14 (1998) 5023-5031]. CWC is a concentration above which a transition from partial wetting to complete wetting occurs at spreading over moderately hydrophobic surfaces, hence, the CWC is associated with the beginning of the superspreading. The latter shows that the knowledge of the CWCs is important for many wetting/spreading applications. We suggest a new method, which allows determining CWCs for a range of trisiloxanes using wetting behaviour of aqueous trisiloxane solutions on highly hydrophobic smooth Teflon AF coated silicon wafers. Using the new method the CWCs for trisiloxane surfactants, Tn with a wide range in the number (n = 4-9) of ethylene oxide units have been measured. The critical aggregation concentration (CAC) for trisiloxane surfactants has been measured using the surface tension methods. Additionally, spreading kinetics of all trisiloxane surfactants studied over moderately hydrophobic substrates has been investigated. It has been found that for all trisiloxanes studied the CWCs are several times higher than their corresponding CAC values. The CWCs for T6 and T8 trisiloxanes obtained according to our approach are in agreement with those measured by Svitova et al. [T. Svitova, R.M. Hill, Y. Smirnova, A. Stuermer, G. Yakubov, Langmuir 14 (1998) 5023-5031] for the case of complete wetting. It has been verified that indeed at CWCs estimated according to our approach trisiloxane surfactant solutions demonstrate superspreading behaviour on moderately hydrophobic surfaces with the exception of trisiloxane T4, which still shows only partial wetting. Thus, the CWC does not depend on the degree of hydrophobicity of substrates and could be considered as a distinct property of surfactants that characterize the highest limit of their spreading capability. Crown

    Original languageEnglish (US)
    Pages (from-to)143-148
    Number of pages6
    JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
    Volume354
    Issue number1-3
    DOIs
    StatePublished - Feb 5 2010

    Fingerprint

    Surface-Active Agents
    wetting
    Wetting
    Surface active agents
    surfactants
    Agglomeration
    Ethylene Oxide
    teflon (trademark)
    Polytetrafluoroethylene
    Substrates
    Hydrophobicity
    hydrophobicity
    ethylene oxide
    Silicon wafers
    Polytetrafluoroethylenes
    Surface tension
    Ethylene
    interfacial tension
    wafers
    aqueous solutions

    Keywords

    • Critical wetting concentration
    • Spreading
    • Trisiloxane

    ASJC Scopus subject areas

    • Surfaces and Interfaces
    • Physical and Theoretical Chemistry
    • Colloid and Surface Chemistry

    Cite this

    Critical wetting concentrations of trisiloxane surfactants. / Ivanova, Natalia; Starov, Victor; Rubio, Ramon; Ritacco, Hernán; Hilal, Nidal; Johnson, Daniel.

    In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 354, No. 1-3, 05.02.2010, p. 143-148.

    Research output: Contribution to journalArticle

    Ivanova, Natalia ; Starov, Victor ; Rubio, Ramon ; Ritacco, Hernán ; Hilal, Nidal ; Johnson, Daniel. / Critical wetting concentrations of trisiloxane surfactants. In: Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2010 ; Vol. 354, No. 1-3. pp. 143-148.
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