Suppressing the Hofmeister anion effect by thermal annealing of thin-film multilayers made of weak polyelectrolytes

Klačić, Tin (avtor), Bohinc, Klemen (avtor), Kovačević, Davor (avtor)

Thin films made of weak polyelectrolytes poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) have been fabricated on silicon wafers using the layer-by-layer (LbL) method. To study the influence of counteranion type on the growth and properties of PAH/PAA multilayers, the nature of the supporting sodium salt was varied from cosmotropic to chaotropic anions (F$^–$, Cl$^–$, and ClO$_4$$^–$). Results of ellipsometry and AFM measurements indicate that the film thickness and surface roughness systematically increase on the order F$^–$ < Cl$^–$ < ClO$_4$$^–$. Furthermore, we found that the hydrophobicity of the PAH/PAA multilayer also follows the described trend when a polycation is the terminating layer. However, the heating of PAH/PAA multilayers to 60 °C during the LbL assembly suppressed the influence of background anions on the multilayer formation and properties. On the basis of the obtained results, it could be concluded that thermal annealing induces changes at the polymer–air interface in the sense of reorientation and migration of polymer chains.

• Jezik: Angleški jezik
• Ključne besede: layers, polyelectrolytes, surface roughness, thickness, thin films
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: ZF - Zdravstvena fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2022
• Št. strani: Str. 9571-9582
• Številčenje: Vol. 55, iss. 21
• PID: 20.500.12556/RUL-142605
• UDK: 544.6.018.47-036.5
• ISSN pri članku: 1520-5835
• DOI: 10.1021/acs.macromol.2c01517
• COBISS.SI-ID: 129267715
• Datum objave v RUL: 15.11.2022

Gradivo je del revije

• Naslov: Macromolecules
• Skrajšan naslov: Macromolecules
• Založnik: American Chemical Society
• ISSN: 1520-5835
• COBISS.SI-ID: 512807449

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: plasti, polielektroliti, površinska hrapavost, debelina, tanki sloji