magistrsko delo
Maša Arnšek (Author), Aleš Podgornik (Mentor), Polona Žnidaršič Plazl (Thesis defence commission member), Boštjan Genorio (Thesis defence commission member)

Abstract

Kositrov dioksid je mineral, ki kristalizira v rutilni strukturi. Zaradi različnih možnosti sinteze ter različnih morfologij poznamo mnogo vrst uporabe, npr. kot senzorski materiali za zaznavo plinov, fotokatalizatorji ter tudi kot elektrode za litij-ionske baterije. Poznamo veliko različnih možnosti sinteze, med njimi pa je tudi več načinov hidrotermalne sinteze. V svoji magistrski nalogi sem se osredotočila na hidrotermalno sintezo SnO2 z vodo, etanolom, NaOH, citronsko kislino ter kositrovim kloridom. Z različnimi poskusi sem poskušala sintezo optimizirati, da sem dobila čim bolj podolgovate kristale. Poskuse sintez sem delala z različnim vrstnim redom dodajanja reaktantov, ter z različnimi količinami citronske kisline v reakcijski zmesi, temperaturo in čas segrevanja pa sem v vseh poskusih pustila konstantna. Produkt je bil karakteriziran z RTG in SEM. V večini poskusov sem dobila cvetačno obliko kristalov, le pri višji koncentraciji citronske kisline so kristali postajali vedno bolj okrogli. Kristali brez citronske kisline so imeli tudi največje razmerje med dolžino in širino. Pri poskusih z različnim vrstnim redom dodajanja reaktantov sem ugotovila, da se razmerje med dolžino in širino bistveno ne spreminja. Pri nekaterih poskusih so nastale tudi cvetačne strukture v obliki šestkotnikov.

Keywords

kositer;kositrov dioksid;hidrotermalna sinteza;cvetačna struktura;nanodelci;mehanizem rasti kristalov;kristalna struktura;magistrska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [M. Arnšek]
UDC: 546.812(043.2)
COBISS: 85530371 Link will open in a new window
Views: 236
Downloads: 43
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Other data

Secondary language: English
Secondary title: Hydrothermal Synthesis of Tin Oxide
Secondary abstract: Tin oxide is a mineral which crystallizes in a rutile structure. Due to variety of synthesis possibilities and different morphologies, many types of usage are known, e.g. it can be implemented as a sensor material for gas detection, for photocatalysts as well as electrodes for lithium-ion batteries. There are many different synthesis routes, including many types of hydrothermal synthesis. In my master’s thesis, I focused on hydrothermal synthesis of SnO2 with water, ethanol, NaOH, citric acid and tin chloride. Via various experiments I tried to optimize synthesis to obtain the most branched chrystals. I ran the synthesis experiments with different orders of addition of the reactants and with different amounts of citric acid in the reaction mixture, keeping the temperature and heating time constant in all experiments. The product was characterized by XRD and SEM. In most experiments I obtained flower-like shaped crystals, only at higher citric acid concetracions did the crystals become more rounded. The crystals without citric acid had highest lenght-to-width ratio. In experiments with different orders of addition of reactants, I found that the length-to-width ratio does not change significantly. Under certain experimental conditions I also found hexagonal flower-like structures.
Secondary keywords: tin oxide;hydrothermal synthesis;flower-like structure;
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: 46 str.
ID: 13469969