Naslov
Supporting Anion and Heating Effect on Properties of Dry Layer-by-layer Assemblies Containing Poly(allylamine hydrochloride) and Poly(acrylic acid)

Autori
Klačić, Tin ; Bohinc, Klemen ; Kovačević, Davor

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

Izvornik
18th European Student Colloid Conference : Programme & Book of Abstracts / Mérai, László ; Sajdik, Kadosa - Segedin : Hungarian Chemical Society, 2022, 55-55

ISBN
978-963-9970-92-2

Skup
18th European Student Colloid Conference

Mjesto i datum
Szeged, Mađarska, 26.06.2022. - 30.06.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Polyelectrolyte multilayers ; Contact angle ; Atomic force microscopy ; Ellipsometry ; Ion-specific effect ; Heating

Sažetak
Polyelectrolytes are macromolecules (e.g. polymers) with dissociating functional groups which can carry positive or negative charge in solution. By alternating adsorption of positively and negatively charged polyelectrolytes on a charged surface, polyelectrolyte multilayers are formed. These nanocomposites have interesting properties and are applied in various scientific fields, mainly in biomedicine and pharmacology [1, 2]. In this study, ultrathin films have been fabricated on silicon wafers from layer-by-layer assembled poly(allylamine hydrochloride), PAH and poly(acrylic acid), PAA. Contact angle measurements, atomic force microscopy and ellipsometry were used to investigate the influence of the supporting sodium salt on the build-up and properties of PAH/PAA multilayer. It was found that the properties of prepared PAH/PAA multilayers follow the Hofmeister series. Thus, hydrophobicity, surface roughness, and film thickness increase in the order F− < Cl− < ClO4−. Interestingly, this ion-specific effect was suppressed when films were exposed to slight heating after each adsorption cycle. In this case, the choice of background salt didn’t affect wettability and surface roughness of PAH/PAA multilayer, but it affected the thickness of the film.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA