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

Year: 2007

Authors: Ziparo C., Eramo R., Gambi M. C., Torre R.

Autors Affiliation: European Laboratory for Non-Linear Spectroscopy (LENS), Universita` di Firenze, Via N. Carrara 1, I-50019 Sesto Fiorentino, Firenze, Italy;
INFM-CRS-Soft Matter (CNR), c/o Universita` la Sapienza Piaz. A. Moro 2, I-00185, Roma, Italy;
Dipartimento di Fisica, Universita` di Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, Firenze, Italy

Abstract: We report results from a 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 of X = 40.8 and a volume fraction phi = 0.50, in a temperature range around the percolation threshold. The measurements have been performed with two exchanged momenta q approximate to 1 and 2 mu m(-1) corresponding to sound frequencies around NO and 420 MHz. The Measured Sound velocities show small but significant evidence of the percolation transition in the temperature domain.

Journal/Review: PHILOSOPHICAL MAGAZINE

Volume: 87 (3-5)      Pages from: 759  to: 767

More Information: The research has been performed at LENS. We thank Riccardo Ballerini for the accurate mechanical realizations, and Mauro Giuntini and Marco De Pas for providing their continuous assistance in the set-up of the electronics. We thank P. Baglioni and M. Ambrosi for AOT purification. This work was also supported by EC grant N.RII3-CT-2003-506350, by CRS-INFM-Soft Matter (CNR) and by MIUR-COFIN-2005 grant N. 2005023141-003.
KeyWords: Diffraction gratings; Heterodyning; Method of moments; Percolation (fluids), Sound frequencies; Sound velocities; Temperature domain; Transient gratings, Microemulsions
DOI: 10.1080/14786430600900120

Citations: 1
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