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master's thesis
Opitmalizacija sinteze superparamagnetnih nanočestica CoFe2O4 s ultra tankim slojem zlata
Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2019. urn:nbn:hr:182:105575
Bjelić, Mirna
Josip Juraj Strossmayer University of Osijek
Department of Chemistry
Department of Analytical, Organic and Applied Chemistry

Institutional repository: Repository of the Department of Chemistry, Osijek

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Bjelić, M. (2019). Opitmalizacija sinteze superparamagnetnih nanočestica CoFe2O4 s ultra tankim slojem zlata (Master's thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry. Retrieved from https://urn.nsk.hr/urn:nbn:hr:182:105575

Bjelić, Mirna. "Opitmalizacija sinteze superparamagnetnih nanočestica CoFe2O4 s ultra tankim slojem zlata." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2019. https://urn.nsk.hr/urn:nbn:hr:182:105575

Bjelić, Mirna. "Opitmalizacija sinteze superparamagnetnih nanočestica CoFe2O4 s ultra tankim slojem zlata." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2019. https://urn.nsk.hr/urn:nbn:hr:182:105575

Bjelić, M. (2019). 'Opitmalizacija sinteze superparamagnetnih nanočestica CoFe2O4 s ultra tankim slojem zlata', Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, accessed 31 December 2024, https://urn.nsk.hr/urn:nbn:hr:182:105575

Bjelić M. Opitmalizacija sinteze superparamagnetnih nanočestica CoFe2O4 s ultra tankim slojem zlata [Master's thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry; 2019 [cited 2024 December 31] Available at: https://urn.nsk.hr/urn:nbn:hr:182:105575

M. Bjelić, "Opitmalizacija sinteze superparamagnetnih nanočestica CoFe2O4 s ultra tankim slojem zlata", Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, Osijek, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:182:105575

Metadata
TitleOpitmalizacija sinteze superparamagnetnih nanočestica CoFe2O4 s ultra tankim slojem zlata
Title (english)Optimization of synthesis of superparamagnetic nanoparticales CoFe2O4 with ultra thin gold layer
AuthorMirna Bjelić
MentorAleksandar Sečenji (mentor)
MentorTatjana Šafarik (pomoć pri izradi, neposredni voditelj)
Committee memberMartina Medvidović-Kosanović (predsjednik povjerenstva)
Committee memberAleksandar Sečenji (član povjerenstva)
Committee memberTomislav Balić (član povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
Department of Chemistry
(Department of Analytical, Organic and Applied Chemistry)
Osijek
Defense date and country2019-09-30, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Organic Chemistry
Abstract
U ovom diplomskom radu nanočestice kobalt ferita sintetizirane su koprecipitacijskom metodom u vodenoj otopini soli željezova klorida heksahidrata (\( FeCl_{3} \) × \( 6H_{2}O \)) i kobaltova klorida heksahidrata (\( CoCl_{2}\) × \( 6H_{2}O \)) u prisutnosti natrijeva hidroksida (NaOH). Istražen je utjecaj temperature i vremena reakcije na veličinu i oblik nanočestica. Sintezom pri temperaturi od 60 ℃ su nastale nanočestice promjera oko 30 nm, dok su produženim stajanjem u reakcijskoj smjesi nastali nanokristali kubične strukture. Prilikom sinteze uz nanočestice \( CoFe_{2}O_{4}\) nastaje znatna količina hidroksidnih međuprodukata. Magnetskom dekantacijom su produkti pročišćeni prilikom čega je promjer nanočestica očuvan kao i njihova svojstva. Površina sintetiziranih nanočestica \( CoFe_{2}O_{4}\) je modificirana redukcijom tetrakloroaurične kiseline s askorbinskom kiselinom pri čemu dolazi do formacije sloja zlata na površini nanočestica. Nanočestice su okarakterizirane dinamičkim raspršenjem svjetlosti (DLS), transmisijskim elektronskim mikroskopom (TEM), infracrvenom spektroskopijom s Fourierovom transformacijom (FT-IR), rentgenskom difrakcijom (PXRD), termogravimetrijskom analizom (TGA), diferencijalno pretražnom kalorimetrijom (DSC) i UV/VIS spektroskopijom.
Abstract (english)
This master thesis deals with the synthesis of cobalt ferrite nanoparticles by co-precipitation method from aqueous solution containing iron chloride hexahydrate (\( FeCl_{3} \) × \( 6H_{2}O \)) and cobalt chloride hexahydrate (\( CoCl_{2}\) × \( 6H_{2}O \)) with sodium hydroxide (NaOH). The effect of temperature and reaction time on nanoparticles size and shape were studied. Synthesis at a temperature of 60 ℃ resulted in nanoparticles with a diameter of 30 nm, while prolonged reaction time resulted in cubic nanoparticles of cobalt ferrite. During synthesis a considerable amount of hydroxide intermediates were formed. The products were purified by magnetic decantation, while the size of the nanoparticles and their characteristic were preserved. The surface of synthesised \( CoFe_{2}O_{4}\) nanoparticles was modified by the reduction of tetrachloroauric acid with ascorbic acid whereby a layer of gold was formed on the surface of the nanoparticles. Nanoparticles are characterised by dynamic light scattering (DLS), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray powder diffraction (PXRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and UV/VIS spectroscopy.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:182:105575
Study programmeTitle: Graduate University Study of Chemistry; research direction
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2019-11-15 11:01:50