Lyotropic Systems

Neto, A. M. Figueiredo; Galerne, Y.

doi:10.1002/9781118696316.ch11

Cited by 5 publications

(1 citation statement)

References 46 publications

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“…Attempts to obtain a biaxial nematic phase by lowering the temperature of an ordinary uniaxial nematic phase resulted in either a glass, a smectic and/or a crystal being formed. In spite of the several setbacks of not unambiguously obtaining a biaxial nematic LC, the subject continues to be of great scientific and technological interest [ 4 ] as it has the potential to obtain faster switching devices that incorporate such a material. Nevertheless the biaxiality was observed in systems other than the board-like molecules, such as a lyotropic LC [ 5 ] and LC polymers [ 6 – 7 ].…”

Section: Introductionmentioning

confidence: 99%

Formation and development of nanometer-sized cybotactic clusters in bent-core nematic liquid crystalline compounds

Panarin¹,

Sreenilayam²,

Vij³

et al. 2018

Beilstein J. Nanotechnol.

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Two homologue achiral bent-core liquid crystals (LCs), BCN66 and BCN84, in their nematic phases are studied by dielectric spectroscopy in the frequency range 10 Hz–10 MHz. In each of these compounds, two relaxation processes are identified and assigned to (i) collective dynamics of molecules in nanometer-sized cybotactic clusters and (ii) individual molecular relaxations, in the ascending order of frequency of the probe field. The temperature and the bias electric field dependence of the dielectric strength and relaxation frequency for these processes are shown to give rise to sharpness in cluster boundaries, increased size and volume fraction in the LC nematic phase. The effect of the bias field on the LC cell is similar to reducing its temperature; both variables increase the cluster size and volume fraction and give rise to sharp cluster boundaries. The findings confirm that dielectric spectroscopy is a powerful and an extremely useful technique to provide a deeper understanding of the mechanism of cybotactic cluster formation in the isotropic liquid and the nematic phase of LCs as a function of temperature and the bias field.

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