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Title:Elektrokalorični pojav v tekočih kristalih
Authors:ID Lešnik, Amadej (Author)
ID Kralj, Samo (Mentor) More about this mentor... New window
Files:.pdf UN_Lesnik_Amadej_2016.pdf (742,40 KB)
MD5: 06E7A32D8BC4D5251AA6FA9F7FABF0EE
 
Language:Slovenian
Work type:Undergraduate thesis
Typology:2.11 - Undergraduate Thesis
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract: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.
Keywords:Elektrokalorični pojav, reverzibilni zaključni cikel, skalirane količine, izotropno-nematični prehod.
Place of publishing:Maribor
Publisher:[A. Lešnik]
Year of publishing:2016
PID:20.500.12556/DKUM-62690 New window
UDC:537(043.2)
COBISS.SI-ID:22748168 New window
NUK URN:URN:SI:UM:DK:WYHYO3WY
Publication date in DKUM:09.11.2016
Views:1750
Downloads:122
Metadata:XML DC-XML DC-RDF
Categories:FNM
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Secondary language

Language:English
Title:Electrocaloric phenomenon in liquid crystals
Abstract: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.
Keywords:Electrocaloric effect, reversible cycle, scaling, isotropic – nematic phase transition.


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