Utjecaji kationa metala na nastajanje, strukturu i svojstva nanočestica hematita

doctoral thesis

• Title (english): Effects of metal cations on the formation, structure and properties of hematite nanoparticles
• Author: Nina Popov
• Mentor: Stjepko Krehula (mentor)
• Committee member: Sanda Rončević (predsjednik povjerenstva)
• Committee member: Marina Cindrić (član povjerenstva)
• Committee member: Ankica Šarić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2022-12-22, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry
• Universal decimal classification (UDC): 54 - Chemistry. Crystallography. Mineralogy

Abstract

Hematit (α-Fe2O3) najstabilniji je željezov oksid i važan mineral u prirodi. Zbog otpornosti na koroziju, netoksičnosti te niske cijene sinteze poželjan je materijal za različite tehnološke primjene (pigmenti, katalizatori, fotokatalizatori, fotoelektrode, elektrode za Li-ionske baterije, senzori za plinove, itd.). Svojstva uzoraka hematita i njihovi učinci u navedenim primjenama jako su ovisni o veličini i obliku čestica (morfologiji), kao i o ugradnji kationa drugih metala (Mn+) u kristalnu strukturu umjesto kationa željeza (Fe3+). Jednodimenzijske (1D) nanočestice metalnih oksida intenzivno se istražuju u zadnje vrijeme zbog svojih specifičnih fizičko-kemijskih svojstava koja mogu biti značajno poboljšana u odnosu na čestice drugih oblika. U ovom doktorskom radu priređene su 1D nanočestice hematita u prisutnosti kationa drugih metala te je istražen utjecaj tih kationa na njihovo nastajanje i strukturu te na magnetska, optička, fotokatalitička i elektrokatalitička svojstva

Abstract (english)

Hematite (α-Fe2O3) is the most stable iron oxide and an important natural mineral. Due to corrosion resistance, nontoxicity, and low price of synthesis it is a desirable material for different technological applications (pigments, catalysts, photocatalysts, photoelectrodes, Li-ion battery electrodes, gas sensors, etc.). Properties of hematite samples strongly depend on morphology (particle size and shape), as well as on incorporation of other metal cations (Mn+) in the crystal structure in the place of iron cations (Fe3+). One-dimensional (1D) metal oxide nanoparticles have been intensely investigated recently due to their specific physico-chemical properties which can be significantly enhanced compared to particles of other shapes. In the present work, 1D hematite nanoparticles were synthesized in the presence of different metal cations and the influence of these cations on their formation, structure, magnetic, optical, photocatalytic and electrocatalytic properties were investigated.

• Keywords: fotokataliza; hematit; magnetska svojstva; Mössbauerova spektroskopija; Morinov prijelaz; nanočestice; željezovi oksidi
• Keywords (english): hematite; iron oxides; magnetic properties; Mössbauer spectroscopy; Morin transition; nanoparticles; photocatalysis
• Language: croatian
• URN:NBN: urn:nbn:hr:217:164585
• Promotion: 2023
• Project: Number: IP-2016-06-8254; Title: Nastajanje i svojstva 1D α-Fe2O3 nanostruktura dopiranih odabranim metalnim ionima; Title: Formation and properties of 1D α-Fe2O3 nanostructures doped with selected metal ions; Acronym: 1D-DopedFeOX; Leader: Stjepko Krehula; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Doctoral study in chemistry; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija (doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija)
• Type of resource: Text
• Extent: 150 str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2024-12-22
• Created on: 2023-02-01 13:35:53