Ultrasonic investigation of critical behaviour and percolation phenomena in microemulsions

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Abstract
Several micellar systems showing critical-like behaviour, as evidenced by light scattering measurements, have been investigated by ultrasonic absorption techniques. An anomalous increase in the ultrasonic absorption has been observed in oil-external systems where the « critical point » is close to a percolation threshold, whereas no increase of the absorption is seen in water-external systems even close to the « critical point ». It is concluded that the origin of the increase of absorption in oil-external systems is due rather to the appearance of open structures at the percolation threshold