On the anomalous sound propagation of nematics just above the clearing point

Ultrasonic study of the nematic-isotropic phase transition in PAA

“…[24] for the A-N transition in CBOOA and TBBA. Of course, in the vicinity of the transition, more complicated behaviour is expected due, for example, to mode-coupling between the order parameter and the hydrodynamic shear mode [25], or to fluctuation effects whose wave numbers are much greater than ç -1 [12]. at the Laboratoire de Physique des Solides of the Université Louis-Pasteur.…”

Relative behaviour of sound absorption and dispersion near the nematic-smectic-A phase transition in TBBA and CBOOA : comment and new results

“…In the context of liquid crystals the simple model provided by the dynamic heat capacity theory offers a convenient framework for experimenters since it gives an estimate of the critical anomalies in the velocity and attenuation from the data of a routine technique such as differential scanning calorimetry. Of course, this theory is not sufficient to explain more complicated behaviour that might appear at temperatures very close to 7~ such as mode-coupling between the order parameter and the hydrodynamic shear mode [38].…”