magistrsko delo
Vid Urbančič (Author), Marjan Marinšek (Mentor), Rok Ambrožič (Thesis defence commission member), Tina Skalar (Thesis defence commission member)

Abstract

Uporaba matematičnih modelov za določanje kinetičnih parametrov preobrazbe anataz-rutil Povzetek: Titanov dioksid je material s širokim spektrom uporabe, ki sega od katalize in uporabe v sončnih celicah do pigmentov bele barve. V naravi se nahaja v obliki različnih rud, ki jih je pred industrijsko uporabo treba obdelati, kar lahko vpliva na njegove fizikalne in kemijske lastnosti. V industriji se največ uporabljata dve kristalni obliki titanovega dioksida - anataz in rutil. Delež faz vsake komponente močno vpliva na lastnosti končnega produkta, prav tako pa imajo nanj vpliv morebitne nečistote. Anataz je v naravi pogostejša in metastabilna oblika titanovega dioksida, medtem ko je rutil stabilna oblika, ki nastane iz anataza pri povišanih temperaturah. V svojem delu sem preučeval fazni prehod iz anataza v rutil, ki je ključen del proizvodnega procesa. Poznavanje tega prehoda je pomembno za optimizacijo procesa in izboljšanje kvalitete končnega produkta. Z uporabo termogravimetrične analize sem določil prisotnost vode in žveplovega dioksida, medtem ko sem z rentgensko praškovno difrakcijo (XRD) in Rietveldovo metodo določil količino posameznih faz. Kristalinično velikost materiala sem izračunal s Scherrerjevo formulo, kinetične parametre faznega prehoda pa sem določil z Avramijevo enačbo in enačbo prvega reda.

Keywords

anataz;rutil;dopiranje;termična analiza;rentgenska difrakcija;Avramijev model;magistrska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [V. Urbančič]
UDC: 546.82-31:544.344.015.4(043.2)
COBISS: 202093827 Link will open in a new window
Views: 72
Downloads: 7
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Other data

Secondary language: English
Secondary title: Application of mathematical models to determine the kinetic parameters of the anatase-rutile transformation
Secondary abstract: Titanium dioxide is a material with a wide range of applications, from catalysis and use in solar cells to white pigments. In nature, it occurs in various mineral forms, which need to be processed before industrial use, potentially affecting its physical and chemical properties. In industry, two main crystalline forms of titanium dioxide are predominantly used: anatase and rutile. The phase composition significantly influences the properties of the final product, and impurities can also have an impact. Anatase is the more common and metastable form of titanium dioxide found in nature, whereas rutile is the stable form produced from anatase at elevated temperatures. In my research, I studied the phase transition from anatase to rutile, which is a crucial part of the manufacturing process. Understanding this transition is important for optimizing the process and improving the quality of the final product. Through thermogravimetric analysis, I determined the presence of water and sulfur dioxide, while using X-ray powder diffraction (XRD) and the Rietveld method to quantify the phases present. I calculated the crystalline size of the material using the Scherrer formula and determined the kinetic parameters of the phase transition with the Avrami equation and first-order kinetics.
Secondary keywords: titanium dioxide;anatase;rutile;phase transformation;Titanov dioksid;Fazni prehodi;Matematični modeli;Univerzitetna in visokošolska dela;
Type (COBISS): Master's thesis/paper
Study programme: 1000376
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, smer Kemijsko inženirstvo
Pages: 1 spletni vir (1 datoteka PDF (60 str.))
ID: 24426564