A small-angle neutron scattering study of the structure of graphitized carbon black aggregates in Triton X-100/water solutions

V.M. Garamus, J.S. Pedersen

    Research output: Contribution to journalJournal article

    Abstract

    The structure of graphitized carbon black (CB) aggregates dispersed in water solutions with a non-ionic surfactant are studied by small-angle neutron scattering using contrast variation by heavy/light water mixing. The addition of CB to Triton X-100/water mixtures shifts the critical micelle concentration to a lower value. The CB aggregates have a fractal structure and the apparent fractal dimension is lower near the match point (75% heavy water). The scattering data are modelled using fractal-like aggregates (CB+surfactant), and voids in the CB particles and micelles. The data are fitted simultaneously for three different contrasts. The fractal dimension is found to be larger than 3 with the maximum size of the fractal aggregate being around 150-200 Angstrom. The primary CB particles have a broad size distribution with an average size of about 30-80 Angstrom. The surfactant coverage of the CB particles is 8% and is constant with varying CB and surfactant concentration. The volume fraction of the voids does not exceed 1% of the CB; The micelle structure is found to be the same as in surfactant/water solutions. (C) 1998 Elsevier Science B.V.
    Original languageEnglish
    JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
    Volume132
    Issue number2-3
    Pages (from-to)203-212
    ISSN0927-7757
    DOIs
    Publication statusPublished - 1998

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