Istraživanje mobilnosti nanodijamanata u vodenom okolišu

master's thesis

• Title (english): Investigation of nanodiamond mobility in the aquatic environment
• Author: Darija Gal
• Mentor: Željka Fiket (mentor)
• Committee member: Tomica Hrenar (predsjednik povjerenstva)
• Committee member: Sanda Rončević (član povjerenstva)
• Committee member: Željka Soldin (član povjerenstva)
• Committee member: Josip Požar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2022-09-20, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Nanodijamanti (ND-i) posjeduju izvanredna svojstva dijamanta ali na nanoskali. Njihova
jedinstvena površinska struktura omogućava funkcionalizaciju površine različitim skupinama,
što ih čini prikladnim za raznovrsnu upotrebu. Opasnost se javlja zbog nedovoljne istraţenosti
sudbine ND-a nakon što dospiju u okoliš, stoga je u ovom radu proučavano ponašanje ND-a u
vodenom okolišu. Stabilnost nanodijamanata ispitana je mjerenjem zeta potencijala suspenzija
nanodijamanata i različitih aditiva (albumin goveĎeg seruma, dekstran sulfat natrijeva sol,
fulvinska kiselina, prirodna organska tvar) u vodi i vodenoj otopini natrijevog klorida. Metoda
dinamičkog raspršenja svjetlosti korištena je za odreĎivanje veličine čestica, što je bio
pokazatelj aglomeracije ili disperzije čestica. Promjenom pH ispitani su optimalni uvjeti
stabilnosti suspenzije. Rezultati su pokazali stabilne otopine ND-a uz dodatak aditiva u vodi
kao otapalu, u kiselim uvjetima, dok je u slučaju vodene otopine NaCl-a došlo do brze
aglomeracije. Stabilnost ND-a u vodenoj otopini NaCl-a je porasla promjenom pH iz kiselog
u luţnato područje.

Abstract (english)

Nanodiamonds possess exceptional properties of bulk diamond but on a nanoscale. Their
unique surface structure enables us to tailor their surface with various functional groups which
opens up opportunities for many applications. Still, fate of NDs in the environment is largely
unknown, which poses an issue of safety risk and therefore the ND behaviour in aqueous
environment was explored here. ND stability in water and aqueous solution of sodium
chloride with various additives (i.e. bovine albumin serum, dextran sulphate sodium salt,
fulvic acid, natural organic matter) was examined through zeta potential measurements.
Dynamic light scattering measurements were performed to determine the particles’ size,
which indicated agglomeration or dispersion of particles. Also, pH dependence on stability of
solutions was determined. Results showed stable suspensions of NDs with additives when in
water and acidic conditions, but rapid agglomeration in aqueous solution of NaCl. ND
stability in aqueous solution of NaCl increased as pH changed from acidic to alkaline.

• Keywords: DLS; nanodijamanti; pH; vodeni okoliš; zeta potencijal
• Keywords (english): aqueous environment; DLS; nanodiamonds; pH; zeta potential
• Language: croatian
• URN:NBN: urn:nbn:hr:217:243003
• Project: Number: IP-2019-04-9354; Title: Transport, sudbina i toksičnost metal(oid)a otpuštenih iz ležišta industrijskog otpada; Title: Transport, fate and toxicity of metal(loid)s released from industrial waste deposits; Acronym: FORtIS; Leader: Željka Fiket; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• 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: 2024-09-20
• Created on: 2022-12-08 15:39:36