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master's thesis
Nanofluidi na osnovi transformatorskog ulja i željezovog oksida
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2015. urn:nbn:hr:149:895353
Ivić, Ivona
University of Zagreb
Faculty of Chemical Engineering and Technology

Institutional repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb

Cite this document

Ivić, I. (2015). Nanofluidi na osnovi transformatorskog ulja i željezovog oksida (Master's thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:895353

Ivić, Ivona. "Nanofluidi na osnovi transformatorskog ulja i željezovog oksida." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2015. https://urn.nsk.hr/urn:nbn:hr:149:895353

Ivić, Ivona. "Nanofluidi na osnovi transformatorskog ulja i željezovog oksida." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2015. https://urn.nsk.hr/urn:nbn:hr:149:895353

Ivić, I. (2015). 'Nanofluidi na osnovi transformatorskog ulja i željezovog oksida', Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 26 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:895353

Ivić I. Nanofluidi na osnovi transformatorskog ulja i željezovog oksida [Master's thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2015 [cited 2024 November 26] Available at: https://urn.nsk.hr/urn:nbn:hr:149:895353

I. Ivić, "Nanofluidi na osnovi transformatorskog ulja i željezovog oksida", Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2015. Available at: https://urn.nsk.hr/urn:nbn:hr:149:895353

Metadata
TitleNanofluidi na osnovi transformatorskog ulja i željezovog oksida
Title (english)Nanofluids based on transformer oils and iron oxide nanopowder
AuthorIvona Ivić
MentorAnte Jukić (mentor)
Committee memberAnte Jukić (predsjednik povjerenstva)
Committee memberMario Šiljeg (član povjerenstva)
Committee memberFabio Faraguna (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2015-04-30, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Chemical Engineering in Material Development
Abstract
U ovom radu provedena su ispitivanja stabilnosti i primjenskih svojstava nanofluida na osnovi mineralnog transformatorskog ulja i nanočestica Fe3O4. Dosadašnja ispitivanja pokazala su kako dodatkom nanočestica u bazni fluid može doći do poboljšanja toplinske vodljivosti i probojnog napona baznog fluida. Rezultati preliminarnih ispitivanja gdje su upotrijebljene komercijalno dostupne površinski aktivne tvari (oleinska, palmitinska i stearinska kiselina) nisu pokazali zadovoljavajuću stabilnost nanofluida. Stoga su sintetizirane vlastite površinski aktivne tvari na osnovi kopolimera metil-, dodecil-, i dimetilaminoetil-metakrilata. Kopolimeri odabranih sastava sintetizirani su izravno u transformatorskom ulju u izotermnim uvjetima uz diperoksidni inicijator. Određena im je raspodjela molekulskih masa i viskoznost razrijeđenih polimernih otopina. Sintetizirani kopolimeri pokazali su se uspješnima kroz ispitani period od sedam dana gdje je utvrđeno da je raspršeno 22-26 mas. % čestica. Dodatak nanočestica Fe3O4 u transformatorsko ulje uz prisutnu polimernu površinski aktivnu tvar uzrokuje sniženje probojnog napona, međutim, dobivene vrijednosti su i dalje u granicama propisanima odgovarajućom normom.
Abstract (english)
In this paper, main task was to perform investigations of stability and application properties of nanofluids based on mineral transformator oil and Fe3O4 nanoparticles. Previous investigations have shown that the addition of nanoparticles in the base fluid can improve the thermal conductivity and breakdown voltage of the base fluid. Results of preliminary tests where commercially available surfactant (oleic, palmitic and stearic acid) were used have not showed satisfactory stability of nanofluids. Therefore, new surfactants were synthesized based on copolymers of methyl-, dodecyl-, and dimethylaminoethyl-methacrylate. Copolymers of selected compositions were synthesized directly in the transformer oil under isothermal conditions by using bifunctional peroxide initiator. Distribution of molecular mass of polymers were obtained by GPC/SEC method and viscosity of polymer dilute solution by capillary viscometry method. The synthesized copolymers have shown as effective surfactants - it was found that after seven days the 22-26 mass.% of nanoparticles was dispersed. Addition of Fe3O4 nanoparticles in transformer oil along with present polymeric surfactant causes a decrease of the breakdown voltage. However, the obtained values are still within the limits required by corresponding standards.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:895353
Study programmeTitle: Materials Science and Engineering - Graduate study
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
Type of resourceText
File originBorn digital
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Created on2016-12-16 11:25:44