Re~u le 24 mars 1977, accepte le lerjuin 1977) Résumé. 2014 On a mesuré par la méthode des battements lumineux le coefficient de diffusion de micelles formées au sein de mélanges quaternaires eau-alcool-tensioactif-toluène, pour différentes valeurs de la fraction volumique de la phase dispersée. Les résultats obtenus conduisent d'une part à admettre une monodispersion du diamètre des micelles, d'autre part à un bon accord 2014 expliqué théoriquementavec les mesures de turbidité. Abstract. 2014 The translational diffusion coefficient of microemulsions formed from water, toluol, sodium dodecyl-sulfate and alcohol, has been measured using light beating spectroscopy. The experimental results show that the microemulsions are monodisperse, the micelles being electrically charged.

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The electromagnetic scattering of rotating blades is investigated both theoretically and experimentally. We have developed an analytical method based on physical optics (PO) and the method of equivalent currents (MEC), in conjunction with the quasi-stationary method. We have predicted the bistatic field scattered by a multiple skew-plated rotating fan. Comparisons with a numerical calculation based on the method of moments and with measurements have given very satisfactory results. A comparison with previously published results has also been carried out. Physical interpretations are given both in time and frequency domains. Our analytical model correctly predicts the spreading and magnitude of the frequency response as a function of the scatterer's skew angles, its rotation frequency, and the directions of incidence and scattering.

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We report on the extension of the droplet model to account for static and dynamic light scattering studies of a ternary water-in-oil microemulsion close to its critical point. This model, which assumes that the critical microemulsion droplets are forming transient polydisperse fractal aggregates, reproduces well the usual features of critical phenomena and is also able to account, in a very natural way, for the dynamical background effects evidenced experimentaly.