Sinteza i karakterizacija nanočestica različitih morfologija

master's thesis

• Title (english): Synthesis and characterization of nanoparticles of different morphologies
• Author: Karla Gotić
• Mentor: Davor Kovačević (mentor)
• Committee member: Davor Kovačević (predsjednik povjerenstva)
• Committee member: Marijana Đaković (član povjerenstva)
• Committee member: Iva Juranović Cindrić (član povjerenstva)
• Committee member: Branimir Bertoša (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2019-12-13, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

U sklopu ovog rada istraženo je nekoliko morfološki različitih nanočestica kako bi se
pronašao potencijalan materijal za izolaciju jednog od najopasnijih radioaktivnijih kationa
cezija iz nuklearnog otpada. Sintetizirana su tri različita tipa čestica cerijeva(IV) oksida –
nanosfere te nanokockice dviju različitih veličina. Uz njih su dodatno okarakterizirane
nanocjevčice titanijeva(IV) oksida. Metodom difrakcije rendgenskog zračenja na praškastom
uzorku potvrđen je sastav te je procijenjena veličina čestica dok je transmisijskom
elektronskom mikroskopijom određena veličina te opisana morfologija čestica. BET analizom
je određena specifična površina svih čestica, a metodom elektroforeze je praćena pokretljivost
čestica u vodenim suspenzijama. Određen je i utjecaj dva alkalijska kationa Na+ i Cs+ na
pokretljivost te na izoelektričnu točku svih tipova čestica. Konačno su svi rezultati uspoređeni
te su se nanocjevčice TiO2 pokazale kao potencijalno povoljan materijal za opis adsorpcije
cezijevog kationa.

Abstract (english)

In this diploma thesis several morphologically different types of nanoparticles were
investigated to find a potential material for isolation of one of the most dangerous radioactive
cations caesium from nuclear waste. Three different types of cerium(IV) oxide nanoparticles
were synthesized and characterised - nanospheres and nanocubes in two different sizes.
Additionally, nanotubes of titanium(IV) oxide were characterised. Using X-ray powder
diffraction method composition was determined and the size of the particles was estimated.
The size and morphology of the nanoparticles was confirmed using TEM; while BET analysis
was used to determine specific nanoparticle surface. Mobility was monitored using
electrophoresis in water suspensions. Additionally, the effect of two alkali cations (Na+ and
Cs+) on mobility and on the isoelectric point has been studied. Finally, all of the results were
compared, and it was established that TiO2 nanotubes are the best material for the assessment
of caesium cation adsorption.

• Keywords: cerijev(IV) oksid; cezij; elektroforetsko raspršenje svjetlosti; izoelektrična točka; nanočestice; TEM; titanijev(IV) oksid
• Keywords (english): cerium(IV) oxide; caesium; electrophoretic light scattering; isoelectric point; TEM; titanium(IV) oxide.
• Language: croatian
• URN:NBN: urn:nbn:hr:217:472138
• Study programme: Title: Graduate university studies in chemistry; specializations in: Research programme; Course: Research programme; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2021-12-13
• Created on: 2020-01-10 14:02:21