Measurements of interactions between particles and charged microbubbles using a combined micro- and macroscopic strategy

Daniel Johnson, Nidal Hilal, Kristian Waters, Kathryn Hadler, Jan Cilliers

    Research output: Contribution to journalArticle

    Abstract

    We report the use of atomic force microscopy (AFM) to study the interactions between silica glass colloidal probes and charged microbubbles created using one of two different surfactants: anionic sodium dodecyl sulfate (SDS) and cationic dodecyl trimethylammonium bromide (DTAB) in an aqueous environment. On close approach between the glass probe and a SDS microbubble, an appreciable repulsive force was observed prior to contact. This was not observed when using a DTAB microbubble, where only attractive forces were observed prior to contact. ζ-potential analysis showed that silica surfaces are negatively charged across the pH range of 3 -10 when surfactant is not present. Addition of SDS did not alter the ζ-potential significantly, indicating that adsorption onto the particle surface did not occur. Conversely, the addition of DTAB decreased the negativity of the ζ-potential, reversing the sign, indicating that adsorption had occurred. This analysis was used in the removal of fine particles from suspension using charged microbubbles. Silica particles were recovered using positively charged microbubbles from DTAB but not when using negatively charged microbubbles generated from SDS. Taken together, the data suggest that repulsive long-range interactions were responsible for the selective attachment of silica particles to microbubbles in a charge-dependent manner.

    Original languageEnglish (US)
    Pages (from-to)4880-4885
    Number of pages6
    JournalLangmuir
    Volume25
    Issue number9
    DOIs
    StatePublished - May 5 2009

    Fingerprint

    Particle interactions
    Sodium dodecyl sulfate
    sodium sulfates
    Bromides
    Sodium Dodecyl Sulfate
    bromides
    Silicon Dioxide
    Silica
    silicon dioxide
    surfactants
    interactions
    Adsorption
    adsorption
    reversing
    Anionic surfactants
    probes
    silica glass
    Fused silica
    Surface-Active Agents
    attachment

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Spectroscopy
    • Electrochemistry

    Cite this

    Measurements of interactions between particles and charged microbubbles using a combined micro- and macroscopic strategy. / Johnson, Daniel; Hilal, Nidal; Waters, Kristian; Hadler, Kathryn; Cilliers, Jan.

    In: Langmuir, Vol. 25, No. 9, 05.05.2009, p. 4880-4885.

    Research output: Contribution to journalArticle

    Johnson, Daniel ; Hilal, Nidal ; Waters, Kristian ; Hadler, Kathryn ; Cilliers, Jan. / Measurements of interactions between particles and charged microbubbles using a combined micro- and macroscopic strategy. In: Langmuir. 2009 ; Vol. 25, No. 9. pp. 4880-4885.
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