Utjecaj završnog sloja i vremena starenja na hidrofobnost polielektrolitnog višesloja kitozan/karboksimetilceluloza ; Međumolekulske interakcije - Učenička pogrešna shvaćanja

master's thesis

• Title (english): Influence of the final layer and aging time on the hydrophobicity of the chitosan/carboxymethylcellulose polyelectrolyte multilayer ; Intermolecular interactions - student's misconceptions
• Author: Marina Bogdanović
• Mentor: Davor Kovačević (mentor)
• Mentor: Draginja Mrvoš-Sermek (komentor)
• Committee member: Davor Kovačević (predsjednik povjerenstva)
• Committee member: Draginja Mrvoš-Sermek (član povjerenstva)
• Committee member: Maja Planinić (član povjerenstva)
• Committee member: Tajana Begović (član povjerenstva)
• Committee member: Karolina Matejak Cvenić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2025-02-24, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

U istraživačkom dijelu ovog rada naizmjeničnom adsorpcijom pozitivnih i negativnih polielektrolita na čvrstoj podlozi pripravljen je polielektrolitni višesloj kitozan/karboksimetilceluloza (CHI/CMC). Istražen je utjecaj završnog sloja i vremena starenja na površinsku močivost i rast višesloja. Površinska močivost analizirana je tenziometrijskim mjerenjima kontaktnog kuta pri različitim uvjetima relativne vlažnosti. Također, istražena je ovisnost kontaktnog kuta silicijskih pločica o načinu čišćenja supstrata. Rast višesloja praćen je elipsometrijskim mjerenjem debljine u odabranim eksperimentalnim uvjetima. Rezultati su pokazali da završni sloj i vrijeme starenja značajno utječu na površinsku močivost i rast višesloja CHI/CMC.
U metodičkom dijelu rada izrađena je metodičko-didaktička priprema za učenike prvog razreda gimnazije, namijenjena obradi nastavne jedinice Međumolekulske interakcije. Priprema je osmišljena u skladu sa strategijom učenja otkrivanjem i temelji se na odgojno-obrazovnim ishodima i najčešćim učeničkim pogrešnim shvaćanjima vezanim uz koncept. U nastavnom satu povezana je građa molekula i međumolekulske interakcije s fizikalnim svojstvima tvari, temeljenim na makroskopskim opažanjima učenika.

Abstract (english)

In the research section, chitosan/carboxymethylcellulose (CHI/CMC) polyelectrolyte multilayers were prepared by alternating adsorption of polycations and polyanions on a solid surface. The influence of the terminating layer and aging on surface wettability and multilayer growth were investigated. Wettability was analyzed using tensiometric contact angle measurements under different humidity conditions, while multilayer growth was monitored by ellipsometry. The impact of substrate cleaning methods on the contact angle of silicon wafers was also examined. Results showed that the terminating layer and aging significantly affected the hydrophobicity and growth of the CHI/CMC multilayer. In the methodological part, a lesson plan on Intermolecular interactions was created for first- year high school students. The lesson was based on educational outcomes and the most common student misconceptions, designed for strategy of learning by discovery. The lesson connected molecular structure and intermolecular interactions to the physical properties of substances through students' macroscopic observations.

• Keywords: elipsometrija; međumolekulske interakcije; polielektrolitni višeslojevi; tenziometrija
• Keywords (english): ellipsometry; intermolecular interactions; polyelectrolyte multilayers; tensiometry
• Language: croatian
• URN:NBN: urn:nbn:hr:217:856880
• Project: Number: 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: Hrvatska zaklada za znanost; Funding stream: Slovenian-Croatian Bilateral Projects
• Study programme: Title: The University Integrated Undergraduate and Graduate Programme in Physics and Chemistry Education; specializations in: Physics and chemistry; Course: Physics and chemistry; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: sveučilišni magistar edukacije fizike i kemije (sveučilišni magistar edukacije fizike i kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-03-04 14:24:35