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Gamma Radiation-Induced Synthesis of Cerium Oxide Mesocrystals
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Gammastrålningsinducerad syntes av ceriumoxidmesokristaller (Swedish)
Abstract [en]

Nanoparticles of cerium dioxide was synthesized by gamma irradiation of aqueous solutions containing CeCl3 and CeBr3. ICP-OES was used to determine the precipitation yield. X-ray powder diffraction and transmission electron microscope were used to characterize the products. The crystal structurewas found by Fourier transform of high resolution electron microscope images,selected area electron diffraction, electron pair distribution function and X-ray powder diffraction. The morphology was examined from high resolution electron microscope images. The chemical composition was examined by electron energy loss spectra. Nanoparticles of 3-4 nm were found to agglomerate and fuse into cubic mesocrystals of 20-40 nm. Changing precursor did not influence the final product. An attempt to change the morphology by increasing the ionic strength with sodium perchlorate was made. At higher ionic strength, the morphology was more random and the yield increased. The size distribution also broadened. Future research can evaluate the catalytic activity of the samples, test other ions to increase the ionic strength to see if it is the ionic strength or the counterion that influences the growth, and do more analysis on the samples prepared.

Abstract [sv]

Nanopartiklar av ceriumdioxid syntetiserades genom gammabestrålning av vatten innehållande CeCl3 och CeBr3. ICP-OES användes för att bestämma utfällningsutbytet. Röntgenkristallografi och transmissionselektronmikroskop användes för att karaktärisera produkterna. Kristallstrukturen hittades genom Fouriertransformering av elektronikmikroskopbilder med hög upplösning, selected area electron diffraction, elektronparfördelningsfunktion och röntgenkristallografi. Morfologi undersöktes från högupplösta elektronmikroskopbilder. Kemisk sammansättning undersöktes med elektronenergiförlustspektra. 3-4 nm stora nanopartiklar agglomerade i kubiska mesokristaller på 20-40 nm. De olika startmaterialen påverkade inte slutprodukten. Ett försök att ändra morfologin genom att öka jonstyrkan med natriumperklorat gjordes. Vid högre jonstyrka ändrades mesokristallernas morfologi till mer slumpmässig och utbytet ökade. Storleksfördelningen blev bredare. Framtida forskning kan utvärdera den katalytiska aktiviteten hos proverna, testa andra joner för att utröna om det är den förhöjda jonstyrkan eller valet av jon som påverkar tillväxten av partiklar, och göra flera analyser av de beredda proverna.

Place, publisher, year, edition, pages
2019. , p. 31
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-260137OAI: oai:DiVA.org:kth-260137DiVA, id: diva2:1354731
External cooperation
Max Planck Institute of Colloids and Surfaces
Educational program
Master of Science in Engineering - Engineering Chemistry
Supervisors
Examiners
Available from: 2019-09-26 Created: 2019-09-26 Last updated: 2019-09-26Bibliographically approved

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