Priprava in karakterizacija CuNi nanodelcev s silikatno prevleko

diplomsko delo univerzitetnega študijskega programa

Olivija Plohl (Author), Irena Ban (Mentor), Mihael Drofenik (Co-mentor)

Abstract

Namen diplomskega dela je bil sinteza magnetnih CuNi nanodelcev določenih sestav z metodo soobarjanja v reverznih micelah znotraj stabilnih mikroemulzij. Nanodelce, ki so pokazali najboljšo dispergiranost in homogenost, smo uporabili v nadaljevanju za površinsko obdelavo magnetnih delcev. Namen silikatne prevleke, s katero smo prevlekli delce, je preprečevanje aglomeracije in rasti zrn ter služi hkrati kot biokompatibilna zaščitna plast, ki omogoča uporabo magnetnih nanodelcev v medicinske namene. Z uporabo dinamičnega sipanja laserske svetlobe (DLS) smo določili velikost delcev, sintetiziranih iz vodnih faz z različno koncentracijo kovinskih prekurzorjev. Koncentracijo, pri kateri smo dobili najugodnejše rezultate, smo uporabili za nadaljnje sinteze, kjer smo spreminjali sestavo posameznih faz ali pa smo spremljali vpliv ostalih komponent. Magnetni nanodelci, ki so pokazali najboljši polidisperzni indeks ter primerno velikost delcev, so bili pozneje oblečeni s prevleko iz silike ter tudi termično modificirani. Nanodelce CuNi smo poskusili obleči tudi s srebrom, vendar smo dobili heterogeno zmes srebrovih in CuNi nanodelcev. Vzorce smo kvalitativno analizirali z rentgensko praškovno difrakcijo (XRD). S pomočjo termogravimetrične analize smo jim določili Curie-jevo temperaturo (Tc). Dispergiranost in velikost ter porazdelitev velikosti delcev smo merili z dinamičnim laserskim sipanjem svetlobe (DLS). Morfologijo vzorcev smo preučili s transmisijskim elektronskim mikroskopom (TEM). Curie-jeva temperatura sintetiziranih vzorcev je odvisna od parametrov sinteze. S spreminjanjem teh parametrov lahko vplivamo na končne velikosti delcev. Z oblačenjem teh delcev s siliko smo preprečili aglomeracijo med termično homogenizacijo in dosegli primerno Curiejevo temperaturo (Tc) za uporabo v magnetni hipertermiji.

Keywords

kemijsko soobarjenje;reverzne micele;magnetni nanodelci;Curierjeva temperatura;oblačenje nanodelcev;

Data

Language:	Slovenian
Year of publishing:	2012
Source:	Maribor
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[O. Plohl]
UDC:	54.057:[546.72:546.74](043.2)
COBISS:	16606998
Views:	1804
Downloads:	192
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Preparation and characterization of CuNi nanoparticles with silica coating
Secondary abstract:	The aim of the diploma work was to study the synthesis of magnetic CuNi nanoparticles with desired compositions using the co-precipitation method in reverse micelles within stable microemulsions. Nanoparticles, which exhibit the best dispersion and homogeneity, were then applied for the surface modification. The purpose of the silica coating was to prevent the agglomeration and grain coarsening and also serves as a biocompatible protecting layer for applications in medicine. By using the dynamic laser light scattering (DLS), the size of the particles synthesized particles was determined. The concentration of the aqueous phase which yields the best result was used for the further syntheses, where we followed the composition of various phases formed and/or the influence of the particular components was examined. The magnetic nanoparticles which exhibit the best polydispersion index and the appropriate size were then coated with silica, and thermally homogenised. An attempt to cover the CuNi nanoparticles with silver was made, however this action results in a heterogeneous mixture of silver and CuNi nanoparticles. A qualitative analysis of the samples was carried out using the X-ray diffraction (XRD). Thermogravimetric analysis was employed to determine Curie temperature (Tc). Dispersion, size and distribution of the particles were measured with the dynamic laser light scattering (DLS). By using the dynamic laser light scaterring (DLS), the size of the particles, synthesized from metal precursors in various aqueous phases was determined. The morphology of the samples was studied with the help of transmission electron microscope (TEM). The Curie temperature of these synthesized samples depends on the synthesis parameters. By changing these parameters, as for instance the optimizing of the homogenisation temperature, the lowering of Tc and an improving of the dispersion and particle size can be achieved. By coating these particles with silica, the agglomeration did not take place and the synthesized particles were then thermally treated to obtain more homogeneous particles with a therapeutic Curie temperature (Tc) appropriate for the use in the magnetic hyperthermia.
Secondary keywords:	chemical coprecipitation;reverse micelles;magnetic nanoparticles;Curier temperature;coating of nanoparticles;
URN:	URN:SI:UM:
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	XV, 72 f.
Keywords (UDC):	mathematics;natural sciences;naravoslovne vede;matematika;chemistry;crystallography;mineralogy;kemija;production;preparation;isolation;purification etc;;mathematics;natural sciences;naravoslovne vede;matematika;chemistry;crystallography;mineralogy;kemija;inorganic chemistry;anorganska kemija;
ID:	1006821