2014 Nous avons révélé, dans un diagramme binaire isobare, l'existence d'une phase smectique intermédiaire entre une phase smectique A monomoléculaire et une phase smectique bimoléculaire. Plusieurs techniques ont été mises en 0153uvre afin de prouver l'existence de cette nouvelle phase. A partir de l'analyse structurale par RX une description de cette phase fluide est proposée qui nous suggère l'appellation « antiphase smectique A » (SÃ). Abstract. 2014 In a binary isobaric diagram there appears an intermediate smectic phase between a monomolecular smectic A phase and a bimolecular one. By means of several techniques evidence is given for this new mesophase with a liquid-like short range ordering. Some considerations about the long range structure of this novel fluid mesophase are put forward from X-ray investigations and lead us to name it as an « SA antiphase » (SÃ).
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