Naslov
Effect of divalent cations on formation and properties of polyelectrolyte nanofilms: robot side of the story

Autori
Mesić, Mia ; Klačić, Tin ; Kovačević, Davor

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
28HSKIKI Book of Abstracts / Rogošić, Marko - Zagreb, 2023, 102-102

Skup
28. hrvatski skup kemičara i kemijskih inženjera

Mjesto i datum
Rovinj, Hrvatska, 28.03.2023. - 31.03.2023

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
polyelectrolytes, polyelectrolyte nanofilms, divalent cations

Sažetak
Polyelectrolytes are macromolecules consisting of a repeating sequence of subunits that have an electrolyte group that can be charged in solution. According to the charge they are divided into polycations, polyanions and polyampholytes, while according to the degree of dissociation in solution, they are divided into strong and weak. Polyelectrolyte multilayers are films formed by alternating adsorption of polycations and polyanions on a surface, most often using the layer-by-layer method [1]. The properties of the film depend on the experimental parameters such as used polyelectrolytes, type of substrate, ionic strength and type of background salt [2, 3]. In this study, we investigated how the type of divalent cation present in deposition solutions affects the formation and properties of multilayer prepared from poly(diallyldimethylammonium chloride) and poly(sodium 4-styrenesulfonate). The examined cations were Mg2+, Ca2+, Sr2+, Ni2+, Zn2+ and Cu2+. Ellipsometry was used for monitoring the growth of the films up to ten layers, while atomic force microscopy was used to determine morphology and surface roughness. The change in surface wettability during polyelectrolyte adsorption was monitored by tensiometry. The thickness, roughness, and wettability of films prepared in the presence of transition metal cations were not significantly different. In contrast, these properties differed for multilayers prepared in the presence of alkaline earth metal cations. To examine if the observed conclusions about the ion-specific effect persist for polyelectrolyte multilayers with a greater number of layers, films of 30 layers were prepared with layer-by-layer deposition robot. Again, it was shown that the thickness, roughness and wettability of films prepared by the robot, in the presence of transition metal cations, were not significantly different while these properties varied for multilayers prepared in the presence of alkaline earth metal cations. Therefore, an ion-specific effect was observed for alkaline earth metal cations but not for transition metal cations.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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