Utjecaj vrste dvovalentnog kationa na formiranje i svojstva polielektrolitnog višesloja poli(dialildimetilamonijev klorid)/poli(natrijev 4-stirensulfonat)

master's thesis

• Title (english): Effect of divalent cations on formation and properties of poly(dialildimethylammonium chloride)/poly(sodium 4-styrenesulfonate) polyelectrolyte multilayer
• Author: Mia Mesić
• Mentor: Davor Kovačević (mentor)
• Committee member: Davor Kovačević (predsjednik povjerenstva)
• Committee member: Željka Soldin (član povjerenstva)
• Committee member: Đani Škalamera (član povjerenstva)
• Committee member: Tajana Begović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2022-07-05, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Naizmjeničnom adsorpcijom pozitivnih i negativnih polielektrolita (tzv. sloj-po-sloj metodom)
na nekoj površini nastaju višeslojevi. Svojstva dobivenih filmova ovise o eksperimentalnim
parametrima poput korištenih polielektrolita, vrste supstrata, ionske jakosti te vrste pozadinske
soli. U ovom diplomskom radu je istraženo kako vrsta dvovalentnog kationa utječe na svojstva
višesloja pripravljenog od poli(dialildimetilamonijeva klorida) i poli(natrijeva 4-stirensulfonata).
Izabrani kationi su Mg2+, Ca2+, Sr2+, Ba2+, Ni2+, Zn2+ i Cu2+
. Elipsometrijom je praćen rast
filmova do deset slojeva, a morfologija i površinska hrapavost određeni su mikroskopom
atomskih sila. Tenziometrijom je praćena promjena močivosti površine prilikom adsorpcije
svakog polielektrolitnog sloja. Dobiveni rezultati ukazuju da kod kationa zemnoalkalijskih
metala postoji ion-specifični efekt koji nije uočen kod kationa prijelaznih metala. Tako su
debljine, hrapavosti i močivosti filmova priređenih uz katione prijelaznih metala slične, dok se
ova svojstva međusobno razlikuju za višeslojeve priređene uz katione zemnoalkalijskih metala.

Abstract (english)

Polyelectrolyte multilayers are formed by alternating adsorption of polycations and polyanions
on a surface (layer-by-layer method). The properties of the film depend on the experimental
parameters such as used polyelectrolytes, type of substrate, ionic strength and type of the
background salt. In this thesis it was investigated how the type of divalent cation affects the
multilayer prepared from poly(diallyldimethylammonium chloride) and poly(sodium 4-
styrenesulfonate). Selected cations are Mg2+, Ca2+, Sr2+, Ba2+, Ni2+, Zn2+ and Cu2+
. The growth of films up to ten layers was monitored by ellipsometry, while morphology and surface
roughness were determined by atomic force microscopy. The change in surface wettability
during adsorption was monitored by tensiometry. Ion-specific effect was observed for alkaline
earth metal cations, while in the case of transition metal cations it was not. The thicknesses,
roughness and wettability of films prepared with transition metal cations are similar, while these
properties differ for multilayers prepared with cations of alkaline earth metals.

• Keywords: elipsometrija; ion-specifični efekt; mikroskopija atomskih sila; polielektroliti; polielektrolitni višeslojevi; tenziometrija
• Keywords (english): atomic force microscopy; ellipsometry; ion-specific effect; polyelectrolytes; polyeclectrolyte multilayer; tensiometry
• Language: croatian
• URN:NBN: urn:nbn:hr:217:492821
• 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: 2023-07-05
• Created on: 2022-07-11 11:54:47