Određivanje veličine nanočestica i zeta potencijala TiO2 u vodenom i uljnom mediju pomoću metode dinamičkog raspršenja svjetlosti

undergraduate thesis

• Title (english): Determination of nanoparticle size and zeta potential of TiO2 in aqueous and oil medium using dynamic light scattering method
• Author: Renata Vičević
• Mentor: Fabio Faraguna (mentor)
• Committee member: Fabio Faraguna (predsjednik povjerenstva)
• Committee member: Marko Racar (član povjerenstva)
• Committee member: Marin Kovačić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-09-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U okviru ovog završnog rada proveden je niz pokusa sa svrhom ispitivanja utjecaja procesnih parametara na veličinu i zeta potencijal TiO2 čestica. Poznavanje veličine čestica i njihova zeta potencijala važno je za formulaciju suspenzije najveće stabilnosti što je često potrebno u industrijskoj proizvodnji. Zeta potencijal ukazuje na stabilnost suspenzije tj. stupanj odbijanja između isto nabijenih čestica u suspenziji. Što se one više odbijaju, suspenzija je stabilnija, a to rezultira većom apsolutnom vrijednosti zeta potencijala. Mjerenje veličina čestica TiO2 provedeno je u ulju PAO 6 i deioniziranoj vodi pomoću metode dinamičkog raspršenja svjetlosti, a veličina izmjerena u deioniziranoj vodi ima 24 puta veću, a u ulju 11 puta veću vrijednost od one koju proizvođač navodi (13 nm). Izmjerena je i promjena zeta potencijala TiO2 čestica u vodenoj matrici u širokom rasponu pH vrijednosti i ionske jakosti te je određeno da je suspenzija najstabilnija pri najmanjoj ionskoj jakosti vodene matrice (0,01 M otopina NaCl) i pri krajnjim ispitanim pH vrijednostima, odnosno 2,52 i 11,48, gdje zeta potencijal ima najveće apsolutne vrijednosti od +37,84 mV i -39,33 mV.

Abstract (english)

Within this thesis, a series of experiments were carried out with the purpose of examining the influence of process parameters on the size and zeta potential of TiO2 particles in oil and aqueous matrix. Information about particle size and their zeta potential is essential for the formulation of a suspension with maximum stability which is often required in industry. The zeta potential indicates the stability of the suspension, the repulsion between the same charged particles in the suspension. The suspension is stable due to the repulsion between the particles which results in higher absolute value of the zeta potential. Particle size measurements were performed in PAO 6 oil and deionised water by using dynamic light scattering. Measured particle size in deionised water is 24 times bigger and in oil 11 times bigger than the size specified by the manufacturer (13 nm). The zeta potential value of TiO2 particles was determined in the aqueous matrix with a change in pH value and ionic strength and it was determined that the suspension has the higher stability at the lowest ionic strength of the aqueous matrix (0.01 M NaCl solution) and at the pH value of 2.52 and 11.48 where the zeta potential has the highest absolute values of +37.84 mV and -39.33 mV.

• Keywords: raspodjela veličina čestica; zeta potencijal; dinamičko raspršenje svjetlosti; titanijev dioksid
• Keywords (english): particle size distribution; zeta potential; dynamic light scattering; titanium dioxide
• Language: croatian
• URN:NBN: urn:nbn:hr:149:375885
• Project: Number: UP.03.1.1.04.0026; Title: CeSaR na Fakultetu kemijskog inženjerstva i tehnologije; Title: CeSaR at the Faculty of Chemical Engineering and Technology; Acronym: CeSaR; Leader: Ante Jukić; Jurisdiction: eu; Funder: EC; Funding stream: ESF
• 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: Access restricted to students and staff of home institution
• Created on: 2023-04-26 08:57:51