Generalization of the polymorphism with 2D fluid smectic phases

On the basis of microscopic observations on free droplets we have located different transition lines between 2D fluid smectic phases in (x, T) binary diagrams. In particular a textural criterion has been defined to identify for the first time the S C -S A phase transition. Our studies lead to the classification of three 2D fluid smectics according to the following sequence: S C -S A -S Ad c d r d e with decreasing temperature Localisation de differentes lignes de transition entre phases smectiques fluides bidimensionnelles dans des diagrammes binaires concentration-temperature. Definition d'un critere de changement de texture pour identifier la transition S c -S A