Priprema i stabilnost nanofluida u niskotemperaturnom eutektičkom otapalu

undergraduate thesis

• Title (english): Preparation and stability of nanofluid in deep eutectic solvent
• Author: Dora Povodnik
• Mentor: Jasna Prlić Kardum (mentor)
• Committee member: Jasna Prlić Kardum (predsjednik povjerenstva)
• Committee member: Aleksandra Sander (član povjerenstva)
• Committee member: Lidija Furač (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-07-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Nanosuspenzije sačinjene od nanočestica raspršenih u eutektičkim otapalima aktualna su tema znanstvenih istraživanja – zbog potencijalne primjene u industrijskoj proizvodnji. Pripremom stabilne nanosuspenzije postiže se povećana toplinska vodljivost što dovodi do smanjenja utrošene energije, a time i do smanjenja utjecaja na okoliš. Za uspješnu primjenu nanosuspenzija u industriji ključna je njihova stabilnost odnosno sprječavanje aglomeracije i sedimentacije kroz duži vremenski period. U ovom radu pripremljena je nanosuspenzija u niskotemperaturnom eutetičkom otapalu te je ispitana njena stabilnost. Nanosuspenzija je pripremljena raspršivanjem 𝐴𝑙2𝑂3 u niskotemperaturnom eutetičkom otapalo pripremljenom od tetrabutilamonijeva bromida i mravlje kiseline u omjeru 1:1. Stabilnost pripremljenog nanofluida ispitana je metodom centrifugiranja, vizualnom metodom, metodom mikroskopiranja, te metodom raspodjele veličine čestica. Kao bitna svojstva nanosuspenzija određena su i toplinska svojstva pripremljenog nanofluida. Također zbog potencijalne primjene nanosuspenzije u procesima kapljevinske ekstrakcije određena su i fizikalno-kemijska svojstva pripremljenog niskotemperaturnog eutektičkog otapala i nanosuspenzije. Korištene metode pokazale su da je pripremljena nanosuspenzija stabilna, a do pojave sedimentacije dolazi nakon 60 dana. Toplinska svojstva nanofluida su se smanjila s vremenom što se također može pripisati agregaciji nanočestica te sedimentaciji.

Abstract (english)

Nanosuspensions composed of nanoparticles dispersed in eutectic solvents are a very current topic of scientific research, due to their cost and environmental friendliness. Nanosuspensions have a great potential for application in industrial production. Due to their increased thermal conductivity there is a reduction in energy consumption, and thus a reduction in environmental impact and reduced production costs. The key to the successful application of nanosuspensions in the industry is their stability, ie the absence of sedimentation or agglomeration over a longer period of time. In this work, a nanofluid in a deep eutectic solvent was prepared and its stability was examined. The nanofluid was prepared by dispersing 𝐴𝑙2𝑂3 in a deep eutetic solvent prepared from tetrabutylammonium bromide and formic acid in a ratio of 1: 1. The stability of the prepared nanofluid was examined by centrifugation, visual method, microscopy method, and particle size distribution method. The thermal properties and physicochemical properties of the prepared nanofluid were also determined as important properties of nanosuspensions. The methods used showed that the prepared nanosuspension is stable, and sedimentation occured after 60 days. The thermal properties of nanofluids have decreased over time, which can be attributed to nanoparticle aggregation and sedimentation.

• Keywords: aluminijev dioksid; niskotemperaturna eutektička otapala; stabilnost nanosuspenzija
• Keywords (english): aluminum dioxide; deep eutectic solvents; nanosuspension stability
• Language: croatian
• URN:NBN: urn:nbn:hr:149:013791
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-04-14 07:53:05