%0 Book Section %1 statphys23_0686 %A Alcantara, C. Garcia %A Varea, C. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K curved interfaces microemulsions statphys23 topic-6 wetting %T Quasiwetting on spheres by oil-water-amphiphile mixtures %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=686 %X We study the wetting behavior on spherical solid surfaces by mixtures of oil, water, and an amphiphile. We use the Ginzburg-Landau free energy with a single order parameter and we calculate the quasiwetting transitions for two sets of parameters in the bulk free energy which are known to show microemulsion behavior. The surface transitions are thin-thick first-order transitions whereas the continuous transitions are absent. Here, the phase diagram in surface parameter space is calculated. For the first set of parameters, we study the first-order transition where the oil phase wets the wall-microemulsion interface and its behavior as the radius of the wall becomes large. We recover the known wetting transitions on a planar wall. In the second set of parameters, the microemulsion phase is metastable, and for some sizes of the spheres, the oil phase wets the wall-water interface. We obtain a coexistence of four surface phases or two triple points followed by three lines of first-order transitions which end at three critical points depending on the radius of the surface. When there are micellar metastable solutions in bulk, the behavior of the thickness of the wetting layer of the oil phase, as the radius of the spherical wall gets larger, is non-monotonic. We associate this behavior with the intrinsic micelle structure due to the spontaneous curvature of the model.

@incollection{statphys23_0686, abstract = {We study the wetting behavior on spherical solid surfaces by mixtures of oil, water, and an amphiphile. We use the Ginzburg-Landau free energy with a single order parameter and we calculate the quasiwetting transitions for two sets of parameters in the bulk free energy which are known to show microemulsion behavior. The surface transitions are thin-thick first-order transitions whereas the continuous transitions are absent. Here, the phase diagram in surface parameter space is calculated. For the first set of parameters, we study the first-order transition where the oil phase wets the wall-microemulsion interface and its behavior as the radius of the wall becomes large. We recover the known wetting transitions on a planar wall. In the second set of parameters, the microemulsion phase is metastable, and for some sizes of the spheres, the oil phase wets the wall-water interface. We obtain a coexistence of four surface phases or two triple points followed by three lines of first-order transitions which end at three critical points depending on the radius of the surface. When there are micellar metastable solutions in bulk, the behavior of the thickness of the wetting layer of the oil phase, as the radius of the spherical wall gets larger, is non-monotonic. We associate this behavior with the intrinsic micelle structure due to the spontaneous curvature of the model.}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Alcantara, C. Garcia and Varea, C.}, biburl = {https://www.bibsonomy.org/bibtex/24bb0f2276811b00440c237544aa0af76/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {1d8c7704d4fb478abbbaa9bef129ccbd}, intrahash = {4bb0f2276811b00440c237544aa0af76}, keywords = {curved interfaces microemulsions statphys23 topic-6 wetting}, month = {9-13 July}, timestamp = {2007-06-20T10:16:27.000+0200}, title = {Quasiwetting on spheres by oil-water-amphiphile mixtures}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=686}, year = 2007 }