title: Small-angle neutron scattering studies of aqueous solutions of short-chain amphiphiles.
abstract: We present small angle neutron scattering measurements on binary aqueous solutions of some short-chain amphiphiles (diols, triols, glycols and diglycols) at room temperature. The spectra were analysed in terms of the Teubner-Strey phenomenological formula which allows to obtain a measure for the amphiphilicity strength of each system (amphiphilicity factor fa). In some systems, however, other models, valid for micellar solutions, give also a good representation of the spectra. As a result, we find that, independently of the type of hydrophilic group side (oxydrilic or oxirane), these systems cover the entire accessible amphiphilicity scale ( -1 < fa < 1). Some disordered systems (fa > 1) presumably are able to form micelle-like aggregates.
authors.affiliation: INFM, Dipartimento di Energetica dell'Università di Roma La Sapienza, Via A. Scarpa, 16-00161 Rome, Italy. giovanni.darrigo@uniroma1.it
authors.forename: G
authors.initials: G
authors.lastname: D'Arrigo
authors.forename: R
authors.initials: R
authors.lastname: Giordano
authors.forename: J
authors.initials: J
authors.lastname: Teixeira