Temperature and concentration dependence of SANS spectra of aqueous solutions of short-chain amphiphilesG. D’Arrigo1, R. Giordano2 and J. Teixeira3
1 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
Received 23 December 2008 / Revised version 23 February 2009 / Published online 6 April 2009
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: firstname.lastname@example.org
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2009