Karakterizacija nanočestica silicijevog dioksida različitih veličina te njihova modifikacija polielektrolitom

master's thesis

• Title (english): Characterisation of silicon dioxide nanoparticles of different sizes and their modification by polyelectrolyte
• Author: Antun Habajec
• Mentor: Davor Kovačević (mentor)
• Mentor: Juraj Nikolić (komentor)
• Committee member: Davor Kovačević (predsjednik povjerenstva)
• Committee member: Ivan Nemet (član povjerenstva)
• Committee member: Vinko Nemec (član povjerenstva)
• Committee member: Gordan Horvat (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2025-02-11, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Nanočestice silicijeva dioksida pokazuju veliki potencijal za primjenu u raznim područjima te je za njihovu primjenu važno razumjeti kako veličina utječe na njihova ostala svojstva. Nadalje, modificiranjem nanočestica adsorpcijom polielektrolita moguće je promijeniti njihova svojstva. Polielektroliti su makromolekule čije podjedinice sadrže ionske ili lako ionizirajuće skupine te ih je moguće adsorbirati na površine suprotnog naboja. U ovome radu istražen je utjecaj veličine nanočestica... More silicijeva dioksida na njihova svojstva te su korištene čestice promjera od 10 nm do 100 nm. Veličina čestica određena je mikroskopijom atomskih sila te pretražnom elektronskom mikroskopijom. Dinamičkim i elektroforetskim raspršenjem svjetlosti određeni su hidrodinamički promjer i ζ-potencijal nanočestica pri različitim koncentracijama natrijeva klorida. Površinski naboj određen je titracijom nanočestica otopinom polielektrolita. Zatim je na nanočestice adsorbiran poli(N-etil-4-vinilpiridinijev) bromid te je određeno kako maksimalna koncentracija polielektrolita ovisi o veličini čestica. Također su određeni veličina čestica, hidrodinamički promjer te ζ-potencijal i uspoređeni s nemodificiranim česticama. Less

Abstract (english)

Silicon dioxide nanoparticles show great potential for application so it’s important to understand how their size affects their other properties. It is possible to modify nanoparticle properties my adsorbing polyelectrolytes on them. Polyelectrolytes are macromolecules which contain ionic or easily ionisable groups, and they can be adsorbed on oppositely charges surfaces. The influence of silicon dioxide nanoparticle size on their properties was studied for nanoparticles with a... More diameter of 10 nm to 100 nm. Particle size was determined by atomic force microscopy and scanning electron microscopy. Dynamic and electrophoretic light scattering was used to determine the hydrodynamic radius and ζ-potential of the particles at different concentrations of sodium chloride. Surface charge was determined by titrating nanoparticles with polyelectrolyte. Then, poly(N-ethyl-4-vinylpyridinium) bromide was adsorbed and the dependence of maximum polyelectrolyte concentration on particle diameter was shown. Particle size, hydrodynamic radius and ζ-potential were also determined and compared to unmodified particles. Less

• Keywords: adsorpcija; nanočestice; poli(N-etil-4-vinilpiridinijev) bromid; površinski naboj; silicijev dioksid
• Keywords (english): adsorption; nanoparticles; poly(N-ethyl-4-vinylpyridinium) bromide; silicon dioxide; surface charge
• Language: croatian
• URN:NBN: urn:nbn:hr:217:033853
• Project: Number: IP-2020-02-9571; Title: Fizikalna kemija procesa na međupovršini mineral/otopina (poli)elektrolita; Title: Physical chemistry of processes at mineral/(poly)electrolyte solution interface; Acronym: POLYMIN2; Leader: Tajana Begović; Jurisdiction: Croatia; Funder: Hrvatska zaklada za znanost; Funding stream: Research Projects
• Study programme: Title: Graduate university studies in chemistry; specializations in: Graduate university studies in chemistry; Course: Graduate university studies in chemistry; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra kemije (sveučilišni/a magistar/magistra kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2026-02-11
• Created on: 2025-02-14 13:44:55