magistrsko delo
Anže Hubman (Author), Tomaž Urbič (Mentor), Franc Požgan (Thesis defence commission member), Jurij Reščič (Thesis defence commission member), Franci Merzel (Co-mentor)

Abstract

Predstavljena je teoretična obravnava adsorpcije vode v tehnološko pomembnem mikroporoznem aluminofosfatu s topologijo por tipa LTA. Uporabljena je kombinacija metod molekularnega modeliranja (simulacije molekulske dinamike, izračuni na nivoju teorije gostotnega funkcionala) z namenom pojasnjevanja eksperimentalnih opazljivk in dodatnega uvida v strukturo in dinamiko poroznega ogrodja oziroma adsorbirane vode. Izboljšamo napoved števila prisotnih molekul vode v polno hidratiranem AlPO4-LTA in pojasnimo vpliv hidratacije na strukturo gostiteljskega ogrodja. Preko primerjave simuliranih in izmerjenih rentgenskih strukturnih faktorjev opozorimo na pasti pri interpretaciji le-teh in demonstriramo ključen prispevek računskih metod. Dodatno pokažemo, da je difuzija zajete vode bistveno upočasnjena in da spominja na dinamiko v steklastih materialih.

Keywords

aluminofosfati;molekulska dinamika;teorija gostotnega funkcionala;difuzija;voda;simulacije;magistrska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [A. Hubman]
UDC: 544.723:544.272(043.2)
COBISS: 159805187 Link will open in a new window
Views: 51
Downloads: 15
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Other data

Secondary language: English
Secondary title: Water adsorption in LTA type aluminophosphate: A computational insight
Secondary abstract: A detailed theoretical treatment of water adsorption in technologically relevant microporous aluminophosphate with LTA-type pore framework is presented. We use a combination of various methods in molecular modelling (molecular dynamics simulations, density functional theory calculations) to explain relevant experimental observables and to provide a further insight into structural and dynamical properties of the hydrated system. We improve the prediction of water loading at the fully hydrated state of AlPO4-LTA and explain the influence of hydration on the structure of the host. Moreover we show a cruicial role of computational approaches for the correct interpretation of experimentally determined X-ray structure factors. Lastly we demonstrate that water diffusion inside the pores is significantly slower as compared to the bulk conditions and revealing a diffusive behavior of glassy systems.
Secondary keywords: adsorption;aluminophosphates;molecular dynamics;density functional theory;diffusion;Adsorpcija;Univerzitetna in visokošolska dela;
Type (COBISS): Master's thesis/paper
Study programme: 1000375
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, smer Kemija
Pages: 50 str.
ID: 19406748