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Hydrotrope; aggregation; sodium butyl benzene sulfonate; small-angle neutron scattering.

The aggregation behaviour of a hydrotrope, sodium 𝑛-butyl benzene sulfonate (Na-NBBS), in aqueous solutions is investigated by small-angle neutron scattering (SANS). Nearly ellipsoidal aggregates of Na-NBBS at concentrations well above its minimum hydrotrope concentration were detected by SANS. The hydrotrope seems to form self-assemblies with aggregation number of 36–40 with a substantial charge on the aggregate. This aggregation number is weakly affected by the hydrotrope concentration.

O R Pal¹ V G Gaikar¹ J V Joshi² P S Goyal² V K Aswal³

1. Chemical Engineering Division, Institute of Chemical Technology, University of Mumbai, Mumbai 400 019, India
2. Inter-University Consortium for DAE Facilities, Mumbai Centre, Bhabha Atomic Research Centre, Mumbai 400 085, India
3. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India