Physics of Amphiphilic Layers: Proceedings of the Workshop, by A. Ben-Shaul, L. Szleifer, W. M. Gelbart (auth.), Dr.

By A. Ben-Shaul, L. Szleifer, W. M. Gelbart (auth.), Dr. Jacques Meunier, Dr. Dominique Langevin, Professor Nino Boccara (eds.)

Amphiphilic layers play crucial roles within the behaviour of an exceptional number of disperse platforms resembling micelles, microemulsions and vesicles. they could additionally exist as remoted mono- or bilayers, or represent prolonged liquid crystalline buildings. even supposing the homes of those assorted platforms may possibly in the beginning sight appear unrelated, theoretical interpretations of them depend upon numerous universal techniques. This used to be the cause of bringing jointly scientists operating during this region for the overseas wintry weather institution at the Physics of Amphiphilic Layers, which was once held at Les Houches, 10-18 February, 1987. the themes handled within the court cases quantity are mono- and bilayers, interactive forces among layers (with specific emphasis on steric forces), ordered constructions (in specific swollen lamellar levels and defects), vesicles, micelles (including polymer-like systems), microemulsions (especially random bicontinuous buildings) and porous media. the significance of thermal fluctuations within the amphiphilic layers is under pressure. fresh effects are offered and literature references let readers no longer conversant in the topic to discover any historical past info they require.

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Extra resources for Physics of Amphiphilic Layers: Proceedings of the Workshop, Les Houches, France February 10–19, 1987

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Laxhuber and H. M6hwald, Phys. Rev. Lett.. in press 5. W. Frey, G. Schneider, H. Ringsdorf and E. Sackmann, Macromolecules. in press 6. G. Schneider, H. Joosten, W. Knoll and E. Sackmann, Europhysics Lett. 1, 449 (1986) 7. J. M. Moy, J. Phys. Chem. 90. 2311 (1986) 8. E. T. M. McConnell, J. Phys. Chem. 90. 1721 (1986) 1. 36 9. 10. 11. 12. 13. 14. 15. 16. 17. Radiation damage cannot be excluded in the coexistence region. The exposure times are rather long and the electron diffraction experiments show that the damage occurs an order of magnitude faster below 1tc than in the completely condensed state.

Vesicle deformation tests are based on simple pressurization by micropipet suction. After the vesicle is pressurized into a spherical shape, further suction acts to dilate the surface area and reduce internal volume. Because the pressures involved in these tests are several orders of magnitude smaller than the pressure required to filter water from the vesicle (against osmotic activity of the trapped solutes), vesicle volumes remain constant. Displacement of the vesicle inside the suction pipet is due to reduction in surface density of the amphiphiles.

L~ Kf' Fig. 5: a) Schematic view of phospholipid molecules stressing the non-equivalence of the two chains and the polar shape of the glycerol backbone with the phosphate group attached to it. b )Discontinuity in orientation of head-groups of strength m = +1 (nomenclature of de Gennes) which is eqivalent to an isolated vortex in the xy-model. The black circle corresponds to the bulky phosphate group of the lipid head. c) Edge dislocation within triangular lattice of chains. Note that the repulsion between the oppOSitely oriented phosphate groups is relaxed in the dilutation region of the dislocation (arrow).

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