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    • Keywords


      Small-angle neutron scattering of micellar solution; n-alkanol effect; interacting micelles

    • Abstract


      Small-angle neutron scattering cross-section distributions of sodium dodecyl sulphate (SDS) and dodecyl trimethyl ammonium bromide (DTAB), each 0·3 M in D2O were obtained in the absence and presence of 0·1 M 1-pentanol, 1-hexanol, and 1-octanol at 25°C. The Hayter-Penfold type analysis was adopted. An ellipsoidal model with semiminor axis (a=16·5 Å) and semimajor axes (b=40·7 Å and 29·8 Å) for pure SDS and DTAB micelles has produced best fits. On increasing alkanol chain lengths an increase inb values was found. Micellar parameters like effective radius (R), (a, b), fraction of counterions per micelle, and intermicellar distances were obtained. Surfactant aggregation number, additive aggregation number intermicellar interaction potentials and values of Debye screening length were obtained for SDS and DTAB in the presence of alkanols. Implications of partitioning effect, surfactant ionicity and intermicellar potentials on the microstructures are rationalised.

    • Author Affiliations


      J Santhanalakshmi1 P S Goyal2 V K Aswal2 G Vijayalakshmi1

      1. Department of Physical Chemistry, University of Madras, A C College Campus, Chennai - 600 025, India
      2. Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai - 400 085, India
    • Dates

  • Journal of Chemical Sciences | News

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