Small-angle neutron scattering studies of aqueous solutions of short-chain amphiphiles.
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.
D'Arrigo
G
G
INFM, Dipartimento di Energetica dell'Università di Roma La Sapienza, Via A. Scarpa, 16-00161 Rome, Italy. giovanni.darrigo@uniroma1.it
Giordano
R
R
Teixeira
J
J