Light beating spectroscopy measurements of microemulsion diffusion coefficient

Abstract

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.

Light scattering study of microemulsions and its relation to percolation phenomena

“…An explanation of the variation of both scattered intensity and diffusion coefficient with scattering angle in our experiments will be given with the help of the recent theories of brownian motion of interacting particles [16,17]. 2. Samples and experimental set up.…”

“…-Water in oil microemulsions are transparent dispersions of water droplets surrounded by amphiphilic molecules in a continuous organic medium. Light scattering techniques already allowed investigators to obtain much information about droplet sizes and interaction forces in these media [1][2][3][4][5][6]. The characteristics of the scattered light are usually typical of brownian motion of small particles interacting through short range potentials (short compared to optical wavelengths) : the correlation function of the scattered electric field is exponential and both the scattered intensity and the diffusion coefficient (deduced from the correlation time) are independent of the scattering angle.…”

Preparation of nanoparticles of silver halides, superconductors and magnetic materials using water-in-oil microemulsions as nano-reactors

“…Due to their importance in various technological applications such as enhanced oil recovery, pharmaceutics, cosmetics, and nanoparticle synthesis, the structure and structural transitions of microemulsions have been extensively studied using X-ray and light scattering, ultracentrifugation, spin label probes, dielectric relaxation, fluorescence probes, and neutron scattering [14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Dielectric analysis of the APG/n-butanol/cyclohexane/water nonionic microemulsions

“…An important one of them is the distribution of cosurfactant molecules in the oil and water phases and the interfacial layer. However, there are no experimental ways to know the distribution quantitatively except along a demixing line [11,12]. It is generally accepted that short-chain alcohols (up to three carbon atoms), which are miscible with water in all proportions, are adsorbed on the interfacial layer.…”