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This study focuses on a comparison between densitometer and dilatometer measurements of two liquid-crystal systems: the ${4{-}methoxybenzylidene{-}4}^{{'}}$-butlylamiline (MBBA) system and a micellar system consisting of octyammonium chloride (OACl) and water. The measurements are taken near two phase transitions: the nematic-isotropic and the hexagonal-isotropic. The former refers to the MBBA and the latter to the OACl. It is observed that whereas, at the nematic-isotropic phase transition, the densitometer and dilatometer measurements exhibit a similar step density change, at the hexagonal-isotropic transition the densitometer measurements show a step density change which is about five times larger than the one detected in the dilatometer experiments. The results are discussed and compared to other liquid-crystal systems.
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Barbosa et al. (1997) studied this question.
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