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- W2005048290 abstract "Solidification (supercooled nematic-to-solid or supercooled smectic-A-to-solid), melting (solid-to-nematic or solid-to-smectic-A), smectic-A-to-nematic, and clearing (nematic-to-isotropic or smectic-A-to-isotropic) transition temperatures ϑs, ϑm, ϑAN, and ϑc, respectively, and enthalpies ΔHs, ΔHm, ΔHAN, and ΔHc, respectively, have been determined by differential scanning calorimetry (DSC) for members of the p-(n-alkyl)-p′-cyanobiphenyl (RCB) and the p-(n-alkoxy)-p′-cyanobiphenyl (ROCB) homologous series of liquid crystals, where ‘R’ is the number of carbon atoms in the n-alkyl or n-alkyloxy tails. The study shows that the transition of the less ordered nematic phase to the more ordered smectic-A phase, in liquid crystals that exhibit both phases (those with R=8 or 9), involves a transient phase of intermediate order. Broad or overlapping solidification exotherms indicate that two mesogenic aggregations supercool simultaneously. Finally, there is evidence for a transition between two solid forms that occurs at temperatures preceding ϑm or concurrent with it depending on ‘R’ and the heating rate. This refutes an earlier view that during melting the solid form with the higher melting point solidifies." @default.
- W2005048290 created "2016-06-24" @default.
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- W2005048290 date "2000-03-01" @default.
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- W2005048290 title "DSC studies on p-(n-alkyl)-p′-cyanobiphenyl (RCB’s) and p-(n-alkoxy)-p′-cyanobiphenyl (ROCB’s) liquid crystals" @default.
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- W2005048290 doi "https://doi.org/10.1016/s0040-6031(99)00411-6" @default.
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