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master's thesis
Polielektrolitni višesloj kitozan/poli(akrilna kiselina): priprava, bubrenje i samozacjeljivanje nanofilma
Zagreb: University of Zagreb, Faculty of Science, 2022. urn:nbn:hr:217:370232
Živković, Ivan
University of Zagreb
Faculty of Science
Department of Chemistry

Institutional repository: Repository of the Faculty of Science

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Živković, I. (2022). Polielektrolitni višesloj kitozan/poli(akrilna kiselina): priprava, bubrenje i samozacjeljivanje nanofilma (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:370232

Živković, Ivan. "Polielektrolitni višesloj kitozan/poli(akrilna kiselina): priprava, bubrenje i samozacjeljivanje nanofilma." Master's thesis, University of Zagreb, Faculty of Science, 2022. https://urn.nsk.hr/urn:nbn:hr:217:370232

Živković, Ivan. "Polielektrolitni višesloj kitozan/poli(akrilna kiselina): priprava, bubrenje i samozacjeljivanje nanofilma." Master's thesis, University of Zagreb, Faculty of Science, 2022. https://urn.nsk.hr/urn:nbn:hr:217:370232

Živković, I. (2022). 'Polielektrolitni višesloj kitozan/poli(akrilna kiselina): priprava, bubrenje i samozacjeljivanje nanofilma', Master's thesis, University of Zagreb, Faculty of Science, accessed 20 November 2024, https://urn.nsk.hr/urn:nbn:hr:217:370232

Živković I. Polielektrolitni višesloj kitozan/poli(akrilna kiselina): priprava, bubrenje i samozacjeljivanje nanofilma [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2022 [cited 2024 November 20] Available at: https://urn.nsk.hr/urn:nbn:hr:217:370232

I. Živković, "Polielektrolitni višesloj kitozan/poli(akrilna kiselina): priprava, bubrenje i samozacjeljivanje nanofilma", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:217:370232

Metadata
TitlePolielektrolitni višesloj kitozan/poli(akrilna kiselina): priprava, bubrenje i samozacjeljivanje nanofilma
Title (english)Chitosan/poly(acrylic acid) polyelectrolyte multilayer: preparation, swelling and self-healing of a nanofilm
AuthorIvan Živković
MentorDavor Kovačević (mentor)
MentorDamir Hasenay (mentor)
Committee memberDavor Kovačević (predsjednik povjerenstva)
Committee memberŽeljka Soldin (član povjerenstva)
Committee memberIvana Biljan (član povjerenstva)
Committee memberTajana Begović (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
Defense date and country2022-02-23, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
Uspješno su pripravljeni višeslojevi kitozan/poli(akrilna kiselina) s različitim brojem slojeva na površini supstrata od silicija. Elipsometrijskim mjerenjima dokazan je eksponencijalni rast debljine filma s brojem adsorbiranih slojeva i ireverzibilnost procesa bubrenja filma. Ni jedan od pripravljenih polielektrolitnih višeslojeva nije pokazao značajniju promjenu debljine s promjenom relativne vlažnosti atmosfere kojoj su bili izloženi. Međutim, pomalo neočekivano većini uzoraka se smanjila debljina prilikom izlaganja visokoj relativnoj vlažnosti. Kako bi se detaljnije istražio ovaj efekt, mikroskopom atomskih sila snimljena je površina desetoslojnog filma prije i nakon izlaganja nanofilma visokoj relativnoj vlažnosti. Na snimkama je uočeno da se gustoća otoka koje formiraju polielektroliti na površini supstrata smanjila nakon ovakvog tretmana višesloja što bi moglo biti zbog reorganizacije polielektrolitnih lanaca. Na kraju je digitalnim optičkim mikroskopom praćeno samozacjeljivanje mehanički oštećenog filma od 60 slojeva. Film je neznatno zacijelio pri visokoj relativnoj vlažnosti, dok je uporabom deionizirane vode na oštećenju došlo do značajnijeg samozacjeljivanja.
Abstract (english)
Chitosan/poly(acrylic acid) multilayers with different numbers of layers were successfully prepared on the surface of a silicon substrate. Ellipsometric measurements have shown the exponential increase in the thickness of the multilayer with the increasing number of layers and the irreversibility of the swelling process. None of the prepared films showed an increase in thickness by changing the relative humidity they were exposed to. Unexpectedly, the films have shown a large decrease in their thickness when they were exposed to high relative humidity. In order to investigate this phenomenon, a surface of the 10-layered film was imaged by atomic force microscope before and after exposure of the nanofilm to high relative humidity. Microscopy scans have shown a decrease in the density of polyelectrolyte islands on a substrate surface caused by this treatment. The reason for that is probably the reorganization of polyelectrolyte chains. Self-healing of the mechanically damaged film of 60 layers was monitored with a digital optical microscope. At high relative humidity, the film heals slightly, while the use of deionized water on the damaged region caused much more pronounced selfhealing.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:370232
ProjectNumber: IPS-2020-01-6126
Title: Modulacija polifenolnog profila voća uslijed fizikalnih tretmana nakon branja
Title: Modulation of fruit polyphenolic profile by sustainable postharvest physical treatments
Leader: Davor Kovačević
Jurisdiction: Croatia
Funder: HRZZ
Funding stream: IPS
Study programmeTitle: 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 resourceText
File originBorn digital
Access conditionsOpen access
Embargo expiration date: 2024-02-23
Terms of useLicence In copyright icon
Created on2022-02-28 12:46:27