20.500.12556/DKUM-45731 Smektična A struktura v prisotnosti vsiljene upogibne deformacije Smectic A structure under the influence of forced bend deformation Superprevodne kovine lahko delimo na dva tipa, ki jih karakteriziramo s tipičnimi razdaljami sistema. V analogiji lahko tudi za smektične tekoče kristale uvedemo podobno delitev. Smektike tipa I in tipa II ločimo s t. i. Ginzburgovim parametrom. V magistrski nalogi bomo preučevali odziv obeh tipov smektikov na vsiljeno upogibno deformacijo. Ta je v sistemu povzročena s t. i. strukturo ribje kosti na površini. Z naklonom brazd strukture vsiljujemo lokalne napetosti v sistemu, kar posledično vpliva na urejanje molekul tekočega kristala znotraj posamezne smektične plasti. V teoretični obravnavi problema zapišemo prosto energijo sistema s pomočjo Landau – de Gennesovega fenomenološkega pristopa. Prosto energijo bomo enodimenzionalno parametrizirali za primer strukture ribje kosti in zapisali Euler – Lagrangeovi enačbi, ki ju rešujemo numerično. Raziskali bomo odziv smektikov tipa I in tipa II na vsiljeno upogibno deformacijo znotraj strukture ribje kosti. Superconducting metals can be divided into two types which are characterized by typical distances of the system. In analogy one can also introduce similar division in smectic liquid crystals. The division of smectics type I and type II is characterized by the Ginzburg smectic parameter. In this master thesis we will examine the response of both types of smectics on a forced bend deformation which will be applied to the system with a so – called herringbone structure. The slope of the latter structure imposes local stresses in the system which consequently affects the ordering of liquid crystal molecules within an individual smectic layer. In this theoretical research of the problem the free energy of the system is written according to the Landau – de Gennes phenomenological approach. We parametrize the free energy in one dimension for the herringbone structure and derive Euler – Lagrange equations which we solve numerically. We will investigate the response of the type I and type II smectics on forced bend deformation in the herringbone structure. tekoči kristali smektična A faza topološki defekti struktura ribje kosti Ginzburgov smektični parameter smektiki tipa I in tipa II liquid crystals smectic A phase topological defects herringbone structure Ginzburg smectic parameter smectics type I and type II true true false [U. Jagodič] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2014-09-02 13:08:55 2014-10-09 13:34:28 2022-05-16 03:06:19 2021-05-02 03:37:24 2014 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.252.23(043.2) 20822792 URN:SI:UM:DK:FWMHTWR2 MAG_Jagodic_Uros_2014.pdf MAG_Jagodic_Uros_2014.pdf 1 F6E867D5B13D448A614A9212B6194621 1ff7b72c3da08894a1246c393e54fcee9e055e609542475a19ffa507fcd32dc8 28f62dd5-7c0b-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=66532 Fakulteta za naravoslovje in matematiko 0 0 0