Abstract
We have observed zigzag disclination lines in uniaxial thermotropic and lyotropic nematic liquid crystals. Our samples are placed in round and flat capillary tubes. This confined geometry and the instability of the lines under three-dimensional perturbations are responsible for the observed shape Observation de lignes de disinclinaison en zigzag dans des nematiques uniaxiaux thermotropes et lyotropes. Les echantillons sont prepares dans les tubes capillaires ronds et rectangulaires. Cette geometrie confinee et l'instabilite des lignes vis-a-vis de perturbations tridimensionnelles sont responsables de la forme observee
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