prikaz prve stranice dokumenta Utjecaj polimera na radiolitičku sintezu magnetskih nanočestica željezovih oksida
Embargo period 2024-05-13
doctoral thesis
Utjecaj polimera na radiolitičku sintezu magnetskih nanočestica željezovih oksida
Zagreb: University of Zagreb, Faculty of Science, 2022. urn:nbn:hr:217:512027
Marić, Ivan
University of Zagreb
Faculty of Science
Department of Chemistry

Cite this document

Marić, I. (2022). Utjecaj polimera na radiolitičku sintezu magnetskih nanočestica željezovih oksida (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:512027

Marić, Ivan. "Utjecaj polimera na radiolitičku sintezu magnetskih nanočestica željezovih oksida." Doctoral thesis, University of Zagreb, Faculty of Science, 2022. https://urn.nsk.hr/urn:nbn:hr:217:512027

Marić, Ivan. "Utjecaj polimera na radiolitičku sintezu magnetskih nanočestica željezovih oksida." Doctoral thesis, University of Zagreb, Faculty of Science, 2022. https://urn.nsk.hr/urn:nbn:hr:217:512027

Marić, I. (2022). 'Utjecaj polimera na radiolitičku sintezu magnetskih nanočestica željezovih oksida', Doctoral thesis, University of Zagreb, Faculty of Science, accessed 20 April 2024, https://urn.nsk.hr/urn:nbn:hr:217:512027

Marić I. Utjecaj polimera na radiolitičku sintezu magnetskih nanočestica željezovih oksida [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Science; 2022 [cited 2024 April 20] Available at: https://urn.nsk.hr/urn:nbn:hr:217:512027

I. Marić, "Utjecaj polimera na radiolitičku sintezu magnetskih nanočestica željezovih oksida", Doctoral thesis, University of Zagreb, Faculty of Science, Zagreb, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:217:512027

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Metadata
TitleUtjecaj polimera na radiolitičku sintezu magnetskih nanočestica željezovih oksida
Title (english)The effect of polymers on the radiolytic synthesis of magnetic iron oxide nanoparticles
AuthorIvan Marić
MentorTanja Jurkin (mentor)
Committee memberSanda Rončević (predsjednik povjerenstva)
Committee memberDubravka Matković-Čalogović (član povjerenstva)
Committee memberŽeljka Petrović (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
Defense date and country2022-05-13, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Universal decimal classification
(UDC)		54 - Chemistry. Crystallography. Mineralogy
Abstract
U ovom doktorskom radu istražen je utjecaj različitih polimera i drugih eksperimentalnih čimbenika na γ-radiolitičku sintezu magnetskih nanočestica željezovih oksida. Redukcija Fe3+ do koje dolazi γ-ozračivanjem prekursorske suspenzije praćena je spektrofotometrijski metodom s 1,10-fenantrolinom. Uz dekstran, dietilaminoetil-dekstran i dekstran sulfat moguće je postići 100 %-tnu redukciju te nastaju stabilne suspenzije magnetskih nanočestica. Uz dietilaminoetil-dekstran pri dozama 10 – 36 kGy nastaju superparamagnetske nanočestice magnetita, dok pri dozama 50 – 130 kGy nastaju magnetski nanodiskovi feroksihita. Uz dekstran sulfat nastaju getit i željezov(III) sulfat hidroksid. Uz poli(etilen-oksid) (PEO) i poli(vinil-pirolidon) nastaju magnetski polimerni gelovi ili magnetske suspenzije, a znatno slabija redukcija (~55 %) rezultira nastankom magnetita i getita, čak i pri visokim dozama (300 kGy). Stupanj umreženja i čvrstoća PEO gela rastu s dozom i koncentracijom prekursora, a do umrežavanja dolazi i preko nanočestica. Osim polimera i doze zračenja, važan utjecaj na stupanj redukcije i fazni sastav produkta imaju i koncentracija 2-propanola i Fe3+ prekursora, pH te koncentracija i molekulska masa polimera.
Abstract (english)
In this thesis, the effect of different polymers and other experimental factors on the γ-radiolytic synthesis of magnetic iron oxides nanoparticles (NPs) was investigated. γ-irradiation-induced Fe3+ reduction was monitored spectrophotometrically with the 1,10-phenanthroline method. With dextran, diethylaminoethyl-dextran, and dextran sulfate colloids, it is possible to achieve a 100 % reduction and formation of stable suspensions of magnetic NPs. With DEAE-dextran, superparamagnetic magnetite NPs form in the dose range of 10 – 36 kGy, while magnetic feroxyhyte nanodiscs form in the 50 – 130 kGy dose range. With dextran sulfate, goethite and iron(III) sulfate hydroxide form. Synthesis with poly(ethylene oxide) (PEO) and poly(vinylpyrrolidone) resulted in the formation of magnetic polymer hydrogels or magnetic suspensions. Significantly lower reduction (~55 %) results in the formation of magnetite and goethite, even at high doses (300 kGy). Degree of crosslinking and strength of PEO gels improve with dose and precursor concentration, while NPs act as additional crosslinkers. Besides the polymer and dose absorbed, 2-propanol and precursor concentrations, pH, polymer concentration and molar mass also affect the reduction and phase composition of the products.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:512027
Promotion2022
ProjectNumber: UIP-2017-05-7337
Title: Utjecaj polimera na radiolitičku sintezu magnetskih nanočestica
Acronym: POLRADNANOP
Leader: Tanja Jurkin
Jurisdiction: Croatia
Funder: HRZZ
Funding stream: UIP
Study programmeTitle: 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 resourceText
Extent229 str. ; 30 cm
File originBorn digital
Access conditionsEmbargoed access
Embargo expiration date: 2024-05-13
Terms of useLicence In copyright icon
RepositoryRepository of the Faculty of Science
Created on2022-05-18 12:48:25

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