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Title:Modeliranje elektronske gostote v tridimenzionalnih fazah termotropnih tekočih kristalov
Authors:ID Vogrin, Martin (Author)
ID Vaupotič, Nataša (Mentor) More about this mentor... New window
Files:.pdf UNI_Vogrin_Martin_2014.pdf (8,23 MB)
MD5: BEE22BE2D9CF16E74D025410D53A6F1A
 
Language:Slovenian
Work type:Final seminar paper
Typology:2.11 - Undergraduate Thesis
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:V diplomskem seminarju predstavimo analizo dolžine in razvejanosti ogljikovodikovih repov tekočekristalnih molekul ter optične čistosti na stabilnost tridimenzionalnih tekočekristalnih faz. Predstavimo strukturno analizo vzorcev z optično mikroskopijo med prekrižanima polarizatorjema, rentgenskim sipanjem in diferencialno dinamično kalorimetrijo, s katerimi identificiramo strukture znotraj tekočekristalnih faz. Na podlagi izkušenj z urejanjem molekul pri višjih in nižjih temperaturah in podatkom o simetriji osnovne celice predpostavimo modelske elektronske gostote in jih uporabimo za rekonstrukcijo elektronske gostote za kubični fazi z $Ia3d$ in $Im3m$ simetrijama ter za tetragonalno fazo z $I4_122$ simetrijo. Iz faz, opaženih pri višjih in nižjih temperaturah, sklepamo tudi o urejanju molekul v obravnavanih tridimenzionalnih fazah.
Keywords:termotropni tekoči kristali, rentgensko sipanje, rekonstrukcija elektronske gostote, teoretično modeliranje elektronske gostote, kubične faze, tetragonalne faze.
Place of publishing:Maribor
Publisher:[M. Vogrin]
Year of publishing:2014
PID:20.500.12556/DKUM-46404 New window
UDC:53(043.2)
COBISS.SI-ID:20862472 New window
NUK URN:URN:SI:UM:DK:6YV2XDA5
Publication date in DKUM:04.02.2021
Views:1238
Downloads:51
Metadata:XML DC-XML DC-RDF
Categories:FNM
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Secondary language

Language:English
Title:Modeling of electron densities in three-dimensional phases of thermotropic liquid crystals
Abstract:In this work we present a systematic study of the effect of length and branching of the aliaphatic tails of liquid crystal molecules and optical purity on the stability of three dimensional liquid crystal phases. We present structural analysis with optical microscopy between crossed polarizers, x-ray scattering and differential scanning calorimetry and from the results we identify structures of liquid crystal phases. From the experience on the molecular arrangement at lower and higher temperatures we construct theoretical electron density models and use them to reconstruct the electron densities for cubic phases with the $Ia3d$ and $Im3m$ symmetries and a tetragonal phase with the $I4_122$ symmetry. In addition, we deduce the molecular arrangement in the investigated phases from the structure of higher and lower temperature phases.
Keywords:thermotropic liquid crystal, x-ray scattering, electron density reconstruction, theoretical modeling of electron densities, cubic phases, tetragonal phases.


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