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master's thesis
Uljni nanofluidi s kemijski modificiranim ugljikovim nanocijevima
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2019. urn:nbn:hr:149:489747
Gracin, Damjan
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

Gracin, D. (2019). Uljni nanofluidi s kemijski modificiranim ugljikovim nanocijevima (Master's thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:489747

Gracin, Damjan. "Uljni nanofluidi s kemijski modificiranim ugljikovim nanocijevima." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2019. https://urn.nsk.hr/urn:nbn:hr:149:489747

Gracin, Damjan. "Uljni nanofluidi s kemijski modificiranim ugljikovim nanocijevima." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2019. https://urn.nsk.hr/urn:nbn:hr:149:489747

Gracin, D. (2019). 'Uljni nanofluidi s kemijski modificiranim ugljikovim nanocijevima', Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 22 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:489747

Gracin D. Uljni nanofluidi s kemijski modificiranim ugljikovim nanocijevima [Master's thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2019 [cited 2024 November 22] Available at: https://urn.nsk.hr/urn:nbn:hr:149:489747

D. Gracin, "Uljni nanofluidi s kemijski modificiranim ugljikovim nanocijevima", Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:149:489747

Metadata
TitleUljni nanofluidi s kemijski modificiranim ugljikovim nanocijevima
Title (english)Oil based nanofluids with chemically modified carbon nanotubes
AuthorDamjan Gracin
MentorAnte Jukić (mentor)
MentorFabio Faraguna (komentor)
Committee memberAnte Jukić (predsjednik povjerenstva)
Committee memberFabio Faraguna (član povjerenstva)
Committee memberJuraj Šipušić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2019-09-24, Croatia
Abstract
Cilj ovog rada je priprava i karakterizacija uljnih nanofluida s oksidiranim i neoksidiranim ugljikovim nanocijevima. Pratila se stabilnost nanofluida kroz određeni vremenski period te odredila toplinska vodljivost i reološka svojstva nanofluida. U tu svrhu pripremljene su suspenzije višestjenčanih ugljikovih nanocijevi (MWCNT) u sintetskom polialfaolefinskom (PAO) baznom ulju uz dodatak polimernih površinski aktivnih tvari (PAT). U prvoj fazi pripreme koristile su se neoksidirane višestjenčane ugljikove nanocijevi, a u drugoj oksidirane višestjenčane ugljikove nanocijevi. Stabilnost pripravljenih nanofluida određivana je vizualno i pomoću UV-VIS spektrofotometrije. Karakterizacija nanofluida provedena je određivanjem reoloških svojstava, toplinske vodljivosti i površinski aktivnih tvari kromatografijom isključenja po veličini. Pripravljeni nanofluidi pokazuju stabilnost kroz ramjerno dug vremenski period, više od jednog mjeseca. Reološka svojstva nanofluida se ne mijenjaju značajno s povećanjem udjela nanocijevi. Toplinska vodljivost se neznatno smanjuje s povećanjem udjela nanočestica. U nastavku istraživanja istražit će se maziva svojstva pripravljenih nanofluida.
Abstract (english)
The aim of this work is preparation and characterization of oil nanofluids with oxidized and unoxidized carbon nanotubes. The stability of the nanofluid was monitored over a period of time and thermal conductivity and also rheological properties of nanofluids. For this purpose, suspensions of multi-wall carbon nanotubes (MWCNTs) were prepared in a synthetic polyalphaolefin (PAO) base oil with the addition of polymeric surfactants (PATs). In the first phase of preparation, unoxidized multi-wall carbon nanotubes were used and in the second oxidized multi-wall carbon nanotubes. The stability of the prepared nanofluids was determined visually and by using UV-VIS spectrophotometry. The characterization of nanofluids was performed by determining rheological properties, thermal conductivity and surfactants using exclusion chromatography by size. The prepared nanofluids show stability over a relatively long time period, more than one month. The rheological properties of nanofluids do not change significantly with increasing nanotube fraction. Thermal conductivity decreases slightly with increasing nanoparticle fraction. In the continuation of the research the lubricating properties of the prepared nanofluids will be investigated.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:489747
Study programmeTitle: Environmental Engineering - Graduate study
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka ekoinženjerstva (magistar/magistra inženjer/inženjerka ekoinženjerstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2022-02-21 11:39:14