Percolation transition in water-AOT-decane microemulsion investigated by transient grating measurement

Carolina Ziparo (1) , Roberto Eramo (2, 3) , Cecilia M.C. Gambi (3) , Renato Torre (3, 2)

1 LENS- European lab. for Non-Linear Spectroscopy
2 LENS European lab. for Non- Linear Spectroscopy
3 Dipartimento di Fisica

We report results from an heterodyne-detected transient grating experiment on a three component microemulsion system, consisting of water-AOT-decane. We studied the microemulsion characterized by a water-to-AOT ratio X=40.8 and a volume fraction φ =0.50, in a temperature range around the percolation threshold. The measurements have been performed with two exchanged momenta q≅1and 2μm^-1, corresponding to sound frequencies around 200 and 420 MHz. The measured sound velocities show a small but significant evidence of the percolation transition in the temperature domain.

Mots clés: Physical Sciences

Carolina Ziparo, Roberto Eramo, Cecilia M.C. Gambi, Renato Torre. Percolation transition in water-AOT-decane microemulsion investigated by transient grating measurement. Philosophical Magazine, 2007, 87 (3-5), pp.759-767. ⟨10.1080/14786430600900120⟩. ⟨hal-00513740⟩