Utjecaj polimernih površinski aktivnih tvari na stabilnost i svojstva nanofluida na bazi transformatorskog ulja

master's thesis

• Title (english): The influence of polymeric surfactants on stability and properties of nanofluids based on transformer oils
• Author: Dino Mujkanović
• Mentor: Ante Jukić (mentor)
• Committee member: Ante Jukić (predsjednik povjerenstva)
• Committee member: Fabio Faraguna (član povjerenstva)
• Committee member: Mirela Leskovac (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2019-03-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Cilj izrade ovog rada je bila priprava i karakterizacija nanofluida na osnovi transformatorskog ulja HyVolt III i nanočestica magnetita (Fe3O4) sa površinski aktivnom tvari (PAT) dobivenom kopolimerizacijom dodecil-metakrilata (DDMA) i N,N-dimetilaminoetil-metakrilata (DMAEM). Nanofluidi se razmjerno nova grana nanotehnologije koja se istražuje zbog dokazanih boljih svojstava, odnosno veće toplinske vodljivosti i manje električne vodljivosti u odnosu na čista mineralna transformatorska ulja. Eksperimenti su se provodili u tri faze. U prvoj fazi se ispitivalo koji molarni omjer komonomera tvori PAT koja pruža najbolju stabilnost nanofluida pri istoj masenoj koncentraciji nanočestica. U drugoj fazi se PAT-u s 5 mol % DMAEM koji je pokazao najbolju stabilnost u prvoj fazi, mijenjala molekulska masa kako bi se ustanovilo kako ona utječe na stabilnost nanofluida. U trećoj fazi su se, osim stabilnosti, ispitivala svojstva kinematičke i dinamičke viskoznosti te toplinske vodljivosti za različite udjele PAT-a u ulju te nanofluidima s različitim udjelima nanočestica.

Abstract (english)

The aim of this paper was preparation and characterization of nanofluids with transformer oil HyVolt III as the base fluid and magnetite nanoparticles (Fe3O4) as surfactants (PAT) obtained by copolymerization of dodecyl methacrylate (DDMA) and N, N-dimethylaminoethyl-methacrylate (DMAEM). Nanofluids are a relatively new branch of nanotechnology that is being investigated recently because of their proven better thermal conductivity and insulation properties compared to mineral transformer oils. Experiments were conducted in three stages. In the first stage, different molar ratios of the monomers that make up PAT were being investigated to find out which of them gives the best stability of nanofluids at the same mass concentration of nanoparticles. In the second stage, the molecular weight of PAT with 5 mol. % DMAEM, which showed the best stability in the previous stage, was changed to determine its effect on the stability of nanofluids. In the third stage, besides stability, the kinematic and dynamic viscosity properties were investigated alongside thermal conductivity for different concentrations of PAT in oil and nanofluids with different concentrations of nanoparticles.

• Keywords: nanofluidi; površinski aktivne tvari; magnetit; stabilnost; toplinska vodljivost; transformatorsko ulje
• Keywords (english): nanofluids; surfactants; magnetite; stability; thermal conductivity; transformer oil
• Language: croatian
• URN:NBN: urn:nbn:hr:149:768345
• Study programme: Title: 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 resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2020-03-29
• Created on: 2022-02-26 10:51:07