prikaz prve stranice dokumenta Otapanje koloidnih čestica flourita prekrivenih natrijevim poli(4-stirensulfonatom)
Embargo period 2025-08-29
master's thesis
Otapanje koloidnih čestica flourita prekrivenih natrijevim poli(4-stirensulfonatom)
Zagreb: University of Zagreb, Faculty of Science, 2024. urn:nbn:hr:217:266699
Vavra Plavšić, Ivor
University of Zagreb
Faculty of Science
Department of Chemistry

Institutional repository: Repository of the Faculty of Science

Cite this document

Vavra Plavšić, I. (2024). Otapanje koloidnih čestica flourita prekrivenih natrijevim poli(4-stirensulfonatom) (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:266699

Vavra Plavšić, Ivor. "Otapanje koloidnih čestica flourita prekrivenih natrijevim poli(4-stirensulfonatom)." Master's thesis, University of Zagreb, Faculty of Science, 2024. https://urn.nsk.hr/urn:nbn:hr:217:266699

Vavra Plavšić, Ivor. "Otapanje koloidnih čestica flourita prekrivenih natrijevim poli(4-stirensulfonatom)." Master's thesis, University of Zagreb, Faculty of Science, 2024. https://urn.nsk.hr/urn:nbn:hr:217:266699

Vavra Plavšić, I. (2024). 'Otapanje koloidnih čestica flourita prekrivenih natrijevim poli(4-stirensulfonatom)', Master's thesis, University of Zagreb, Faculty of Science, accessed 09 November 2024, https://urn.nsk.hr/urn:nbn:hr:217:266699

Vavra Plavšić I. Otapanje koloidnih čestica flourita prekrivenih natrijevim poli(4-stirensulfonatom) [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2024 [cited 2024 November 09] Available at: https://urn.nsk.hr/urn:nbn:hr:217:266699

I. Vavra Plavšić, "Otapanje koloidnih čestica flourita prekrivenih natrijevim poli(4-stirensulfonatom)", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:217:266699

Metadata
TitleOtapanje koloidnih čestica flourita prekrivenih natrijevim poli(4-stirensulfonatom)
Title (english)Dissolution of fluorite colloid particles coated with sodium poly(4-styrenesulphonate)
AuthorIvor Vavra Plavšić
MentorTajana Begović (mentor)
MentorJuraj Nikolić (komentor)
Committee memberTajana Begović (predsjednik povjerenstva)
Committee memberIvan Nemet (član povjerenstva)
Committee memberIvana Biljan (član povjerenstva)
Committee memberDavor Kovačević (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
Defense date and country2024-08-29, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
Praćena je kinetika otapanja čestica fluorita u vodi prije i nakon prekrivanja natrijevim poli(4-stirensulfonatom) pri nekoliko različitih pH vrijednosti pomoću fluoridne (F-ISE) i kalcijeve ion-selektivne elektrode (Ca-ISE), pH elektrode te konduktometrijski. Pomoću metoda dinamičkog i elektroforetskog raspršenja svjetlosti praćena je veličina odnosno elektrokinetički potencijal čestica tijekom otapanja. Prisutnost natrijeva poli(4-stirensulfonata) na česticama nakon adsorpcije potvrđena je UV-Vis spektrofotometrijom i elektroforetskim raspršenjem svjetlosti. Mjerenja s ISE pokazala su da se prekrivene čestice otapaju sporije od neprekrivenih, dok su mjerenja provodnosti pokazala suprotno. Mjerenja s F-ISE ukazuju da brzina otapanja neprekrivenih čestica ne ovisi o pH vrijednosti, dok mjerenja s Ca-ISE ukazuju na smanjenje brzine s povećanjem pH. Mjerenjima s ISE uočeno je da se prekrivene čestice otapaju najbrže pri pH = 4, a bez značajne međusobne razlike pri pH = 6 i pH = 8. Mjerenja provodnosti potvrđuju smanjenje brzine otapanja s porastom pH vrijednosti za neprekrivene i prekrivene čestice.
Abstract (english)
The dissolution kinetics of fluorite particles in water were studied before and after coating with sodium poly(4-styrenesulfonate) at various pH values using fluoride (F-ISE) and calcium ion- selective electrodes (Ca-ISE), a pH electrode, and conductometrically. Dynamic and electrophoretic light scattering were used to measure particle size and electrokinetic potential during dissolution. The presence of sodium poly(4-styrenesulfonate) on particles was confirmed by UV-Vis spectrophotometry and electrophoretic light scattering. ISE measurements indicated that coated particles dissolve more slowly than uncoated ones, whereas conductivity measurements showed the opposite. F-ISE data suggested that the dissolution rate of uncoated particles is pH-independent, while Ca-ISE data indicated a decrease in rate with increasing pH value. ISE measurements showed that coated particles dissolved fastest at pH = 4, with no significant difference between pH = 6 and pH = 8. Conductivity measurements confirmed a decrease in dissolution rate with increasing pH for both coated and uncoated particles.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:266699
ProjectNumber: 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 programmeTitle: 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 resourceText
File originBorn digital
Access conditionsEmbargoed access
Embargo expiration date: 2025-08-29
Terms of useLicence In copyright icon
Created on2024-10-03 14:37:45