Eur. Phys. J. E 29, 37-43 (2009)
DOI: 10.1140/epje/i2008-10447-7

Temperature and concentration dependence of SANS spectra of aqueous solutions of short-chain amphiphiles

G. D’Arrigo¹, R. Giordano² and J. Teixeira<sup>3

1</sup>  INFM, Dipartimento di Energetica, dell’Università di Roma “La Sapienza”, Via Scarpa 16, 00161, Roma, Italy
²  Dipartimento di Fisica, dell’Università di Messina, 08166, Vill. S. Agata, Messina, Italy
³  Laboratoire L. Brillouin (CEA/CNRS), CE Saclay, Paris, France

giovanni.darrigo@uniroma1.it

Received 23 December 2008 / Revised version 23 February 2009 / Published online 6 April 2009

Abstract

The small-angle neutron scattering (SANS) of some aqueous solutions of short-chain amphiphiles (glycols, diglycols, diols) has been measured as a function of concentration and temperature. The analysis of the spectra in terms of the Teubner-Strey phenomelogical formula indicates that, on increasing the concentration of the amphiphile, the structure of all these systems evolves in a similar way, i.e. a transition from disordered structures toward correlated aggregates (microstructures). The transition is depressed by increasing the temperature.

PACS
82.70.Uv - Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems, (hydrophilic and hydrophobic interactions).
61.05.fg - Neutron scattering (including small-angle scattering).
61.20.Gy - Theory and models of liquid structure.

Correspondence: giovanni.darrigo@uniroma1.it


© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2009