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Title:Smektična A struktura v prisotnosti vsiljene upogibne deformacije
Authors:ID Jagodič, Uroš (Author)
ID Repnik, Robert (Mentor) More about this mentor... New window
ID KRALJ, SAMO (Comentor)
Files:.pdf MAG_Jagodic_Uros_2014.pdf (2,55 MB)
MD5: F6E867D5B13D448A614A9212B6194621
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract: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.
Keywords:tekoči kristali, smektična A faza, topološki defekti, struktura ribje kosti, Ginzburgov smektični parameter, smektiki tipa I in tipa II
Place of publishing:Maribor
Publisher:[U. Jagodič]
Year of publishing:2014
PID:20.500.12556/DKUM-45731 New window
UDC:544.252.23(043.2)
COBISS.SI-ID:20822792 New window
NUK URN:URN:SI:UM:DK:FWMHTWR2
Publication date in DKUM:09.10.2014
Views:2375
Downloads:177
Metadata:XML DC-XML DC-RDF
Categories:FNM
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Secondary language

Language:English
Title:Smectic A structure under the influence of forced bend deformation
Abstract: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.
Keywords:liquid crystals, smectic A phase, topological defects, herringbone structure, Ginzburg smectic parameter, smectics type I and type II


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