20.500.12556/DKUM-89782 Pretransitional effects of the isotropic liquid-plastic crystal transition We report on strong pretransitional effects across the isotropic liquid–plastic crystal melting temperature in linear and nonlinear dielectric response. Studies were carried out for cyclooctanol (C8H16O) in the unprecedented range of temperatures 120 K < T < 345 K. Such pretransitional effects have not yet been reported in any plastic crystals. Results include the discovery of the experimental manifestation of the Mossotti Catastrophe behavior, so far considered only as a hypothetical paradox. The model interpretations of experimental findings are proposed. We compare the observed pretransitional behavior with the one observed in octyloxycyanobiphenyl (8OCB), typical liquid crystal (LC), displaying a reversed sequence of phase transitions in orientational and translational degrees of order on varying temperature. Furthermore, in its nematic phase, we demonstrate first-ever observed temperature-driven crossover between regions dominated by isotropic liquid and smectic A pretransitional fluctuations. We propose a pioneering minimal model describing plastic crystal phase behavior where we mimic derivation of classical Landau-de Gennes-Ginzburg modeling of Isotropic-Nematic-Smectic A LC phase behavior. plastic crystal melting pretransitional behavior nonlinear dielectric effect dielectric constant Mossotti Catastrophe plastični kristali taljenje prehodno obnašanje nelinearni dielektrični učinek dielektrična konstanta true true true MDPI Angleški jezik Slovenski jezik Članek v reviji 2024-08-12 09:45:32 2024-08-12 10:14:02 2024-08-14 08:46:05 0000-00-00 00:00:00 2021 0 0 Str. 1-15 Št. 2, št. članka 429 Letn. 26 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2020-11-20 2021-01-12 2021-01-15 537 47374595 10.3390/molecules26020429 1420-3049 Drozd-Rzoska-2021-Pretransitional_Effects_of_t.pdf Drozd-Rzoska-2021-Pretransitional_Effects_of_t.pdf 1 2A7B7696C68474B77171AB54EB9FEC9B 72bdaeffc56b109cfad79964d7c3eb967e774f7252ad40fdfd1070a143d619b7 6696c499-5882-11ef-a285-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=182248 https://doi.org/10.3390/molecules26020429 0 962aa1c4-5882-11ef-a285-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=182249 Fakulteta za naravoslovje in matematiko 0 0 0