The study by neutron small-angle scattering of reversetype micellar solutions of the ternary system water-OT aerosol-n-heptane is reported. The contrast variation method used both on the water inside the micelle and on the solvent makes it possible to determine some structural parameters of the micelle and to propose two micellar models. comme solvant organique le n-heptane qui permet une tr6s grande solubilisation d'eau (jusqu'/t 70 moles d'eau par mole d'AOT).L'absence d'interactions en solutions dilu6es permet de d6gager, par la technique du contraste variable, les param&res structuraux importants: volume de la particule, nombre de monom6res et surface disponible par t&e polaire lorsqu'un mod61e micellaire peut &re choisi.
We study the part played by an added salt upon the size of reversed micelles of the ternary system Aerosol OT-n-heptane-water by small angle neutron scattering. The growth of the micellar size is clearly shown. The spherical model seems to be the best for the description of the micelle
Nous avons étudié, par diffusion centrale des neutrons, des solutions micellaires d'un tensioactif ionique, le p. octylbenzènesulfonate de sodium. Une étude en contraste variable, portant à la fois sur le solvant et sur la région paraffinique, a permis de déterminer les paramètres descriptifs de la micelle suivant deux analyses. La cohérence des résultats obtenus montre que la procédure choisie élimine les effets de corrélations entre micelles
(Recu le 13 aoftt 1972, acceptd le 13 novembre 1972)The effect of the double-sca.;.tering process on X-ray intensity diffracted by an amorphous sample is studied in the case of 0-20 diffractometric techniques with monochromator, by transmission and reflexion; the small-angle X-ray scattering method is taken into account. An experimental application shows the amount of the correction in the case of transmission.
The structure of micellar solutions is determined from X‐ray small‐angle scattering measurements on an absolute scale. The most probable structure is chosen by comparison with spherical cylindrical and lamellar models. This method is applied to two‐component micelles and it is possible to follow the variation of micellar dimensions when the concentration of each component is varying.
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