20.500.12556/DKUM-62690 Elektrokalorični pojav v tekočih kristalih Electrocaloric phenomenon in liquid crystals V pričujočem diplomskem delu teoretično preučimo elektrokalorični (EK) pojav v tekočih kristalih (TK), pri čemer opisujemo električno inducirano spremembo temperature. Kot osnovni model smo uporabili Landau-de Gennes-Ginzburgov model, ki opisuje mezoskopsko urejenost sistema z ustreznim parametrom. Obravnavali smo reverzibilni zaključeni cikel, ki zajema adiabatni vklop in izklop statičnega zunanjega polja. Raziskali smo pogoje, pri katerih dosežemo maksimalno spremembo temperature. Analizirali smo tipični EK odziv tik nad izotropno-nematičnem faznem prehodu v termotropnem TK in analitično ocenili vpliv smektičnega ureditvenega parametra na EK pojav. Predstavljeno je tudi izhodiščno modeliranje EK pojava v sistemih TK. This diploma thesis provides a theoretical overview of electrocaloric effect in liquid crystals as a physical phenomenon, wherein the influence of temperature variations on the overall electrical resistance is investigated. As a basic model, we used Landau-de Gennes-Ginzburg model that is describing mezzo-scopic order of system with relevant parameter. The analysis deals with reversible cycle carrying out the adiabatic compression and expansion from the outfield. In addition it shows that under certain conditions the maximum temperature variation is achived. We analysed typical electrocaloric response right by the point of isotropic-nematic phase transition of the thermotropic liquid crystal and evaluated influence of smectic order parameter on the electrocaloric effect. Introduced is also base modeling of electrocaloric effect in liquid crystal systems. Elektrokalorični pojav reverzibilni zaključni cikel skalirane količine izotropno-nematični prehod. Electrocaloric effect reversible cycle scaling isotropic – nematic phase transition. true true false [A. Lešnik] Slovenski jezik Angleški jezik Diplomsko delo 2016-08-30 23:53:19 2016-11-09 15:38:40 2022-06-30 03:07:11 2019-07-11 13:04:17 2016 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 537(043.2) 22748168 URN:SI:UM:DK:WYHYO3WY UN_Lesnik_Amadej_2016.pdf UN_Lesnik_Amadej_2016.pdf 1 06E7A32D8BC4D5251AA6FA9F7FABF0EE 45a560bbb974a19a3ee44d7c1844c144dd12a48288a7fce7f0bc98da1ca83256 35dda38d-7c0d-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=101233 Fakulteta za naravoslovje in matematiko 0 0 0