Određivanje odabranih fizikalno-kemijskih značajki vodenih suspenzija Al2O3

master's thesis

• Author: Karla Jagić
• Mentor: Sanda Rončević (mentor)
• Committee member: Sanda Rončević (predsjednik povjerenstva)
• Committee member: Davor Kovačević (član povjerenstva)
• Committee member: Biserka Prugovečki (član povjerenstva)
• Committee member: Iva Juranović Cindrić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2018-07-12, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Stabilnost suspenzije aluminijevog oksida je jedan od temeljnih zahtjeva u optimizaciji fizikalno-kemijskih svojstava sustava za dobivanje naprednih keramika. Za dobivanje stabilne suspenzije koriste se razna dispergirajuća sredstva. Mjerenjem zeta potencijala ispitana je stabilnost vodene suspenzije aluminijevog oksida uz prisutnost limunske kiseline, te tirona kao dispergirajućih sredstava. Na temelju dobivenih rezultata mjerenja ζ potencijala 0,01 %-tne w/v Al2O3 suspenzije uz dodatak različitog udjela limunske kiseline utvrđena je najveća stabilnost uz dodatak 0,3 %-tne limunske kiseline. U ispitivanom nizu različitih udjela dodatka tirona, najveća stabilnost suspenzije Al2O3 bila je uz dodatak 0,5 %-tnog tirona. Određena je veličina čestica u svakom od ispitivanih sustava koja korelira s rezultatima mjerenja zeta potencijala. Čistoća suspenzija analizirana je metodom atomske emisijske spektrometrije uz induktivno spregnutu plazmu (ICP-AES). Određivanjem sastava suspenzija aluminijevog oksida dobiven je uvid u sadržaj elemenata: Al, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Na, Ni, Pb, Sr, Zn, Ag i K. Iz sastava otopina nakon filtriranja suspenzije utvrđeno je da su otopine visoke čistoće te da uz oba ispitivana disperzanta ne dolazi do kemijskih reakcija koje bi znatno utjecale na otpuštanje aluminijevih iona u otopinu.

Abstract (english)

Stability of alumina suspension is one of the fundamental requirements in optimizing the physicochemical properties during production of advanced ceramic materials. Various dispersing agents are used for stabilization of suspension. Stability of aqueous solutions of Al2O3 using citric acid and tiron as dispersants was tested by determination of zeta-potential. The suspension of 0.01 % w/v Al2O3 with 0.3 % of citric acid showed greatest stability comparing to whole set of examined additions. Among the set of suspensions with different addition of tiron, the suspension with 0.5% added dispersant showed the greatest stability. Determination of particle size and distribution showed results that correlate to zeta-potential measurements. Purity of prepared suspension was analysed by inductively coupled plasma emission spectrometry (ICP-AES). The element content of Al, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Na, Ni, Pb, Sr, Zn, Ag and K was determined. From obtained results is visible that all suspensions are of high purity and that are no reactions that might affect the release of aluminium into solutions.

• Keywords: Al2O3; ICP-AES; limunska kiselina; tiron; veličina čestica; zeta potencijal
• Keywords (english): Al2O3; citric acid; ICP-AES; particle size; tiron; zeta-potential
• Language: croatian
• URN:NBN: urn:nbn:hr:217:142303
• Study programme: Title: Graduate university studies in chemistry; specializations in: Research programme; Course: Research programme; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2020-07-12
• Created on: 2018-07-13 09:37:38