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Surfactants, Adsorption, Surface Spectroscopy and Disperse by B. Lindmann, G. Olofsson, P. Stenius

By B. Lindmann, G. Olofsson, P. Stenius

The current quantity of development in Colloid and Polymer technological know-how comprises papers provided on the eighth Scandinavian Symposium on floor Chemistry which used to be held on the collage of Lund, Sweden, on June 4-6, 1984.The Symposium was once attended through approximately one hundred sixty scientists, of whom greater than 50 represented the commercial group. The 50 non-Nordic members gave the Symposium a global personality. this system consisted of six plenary lectures, 21 oral and 38 poster shows.

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2. Experimental number of scattered electrons, N(E), of energy, E, versus electron energy for a Rh(lll) surface covered with a monolayer of ethylidyne species (CCH3) the stable, room temperature structure of chemisorbed ethylene. Boxes and inset figures show how particular scattered electrons are used in (a) Auger electron spectroscopy, (b) high resolution electron energy loss spectroscopy and (c) low energy electron diffraction Fig. 3. 4 tion studies as a function of depth (depth profile analysis) clearly reveal changes of surface composition layer by layer from the surface inward.

In this work we have focused on the effects of adding 1-alcohols to the surfactants mentioned above. The effects of temperature and pressure on the shape transition have also been studied. Experimental Sodium dodecylsulfate (NaDDS) was supplied by BDH, "specially pure" grade. Dodecylammonium chloride (DAC) and dodecyltrimethylammonium bromide (DTAB) were supplied by Eastman Kodak. The alcohols 1-hexanol (C6OH), 1-heptanol (CTOH), and 1-octanol (CsOH) were supplied by Fluka at their best quality.

In the case of Triton-X-100 (table 2) we observed a similar trend with increasing temperature. The estimated ~ value for NP-10 is negative for the prolate shape while it is positive for the oblate. We can thus conclude that for NP-10 the most probable shape of micelles is oblate, as was also found for Triton-X-100. On the other hand, the ~ values for NP-13 and NP-18 are positive for both prolate and oblate ellipsoids, and hence one cannot easily conclude which of the two shapes is preferred. 4g H 2 0 / g N P - 1 3 - l m o l e H20/ethyleneoxide unit), which allows one to conclude that an oblate (with hydration 3mole H20/ethyleneoxide unit) ellipsoidal shape is preferred.

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