Suppressing the Hofmeister anion effect by thermal annealing of thin-film multilayers made of weak polyelectrolytes
ID Klačić, Tin (Author), ID Bohinc, Klemen (Author), ID Kovačević, Davor (Author)

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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.

Keywords:layers, polyelectrolytes, surface roughness, thickness, thin films
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:ZF - University College of Health Studies
Publication status in journal:Published
Article version:Publisher's version of article
Number of pages:Str. 9571-9582
Numbering:Vol. 55, iss. 21
PID:20.500.12556/RUL-142605 This link opens in a new window
ISSN on article:1520-5835
DOI:10.1021/acs.macromol.2c01517 This link opens in a new window
COBISS.SI-ID:129267715 This link opens in a new window
Publication date in RUL:15.11.2022
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Record is a part of a journal

Shortened title:Macromolecules
Publisher:American Chemical Society
COBISS.SI-ID:512807449 This link opens in a new window


License:CC BY 4.0, Creative Commons Attribution 4.0 International
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Keywords:plasti, polielektroliti, površinska hrapavost, debelina, tanki sloji


Funder:HRZZ - Croatian Science Foundation
Project number:IPS-2020-01-6126
Name:Modulation of fruit polyphenolic profile by sustainable postharvest physical treatments

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P3-0388
Name:Mehanizmi varovanja zdravja

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:J7-2595
Name:Modulacija polifenolnega profila v sadju s trajnostnimi fizikalnimi poobiralnimi postopki

Funder:Drugi - Drug financer ali več financerjev
Funding programme:CEEPUS, Colloids and nanomaterials in education and research
Project number:CIII-HR-1108-1920-139486

Funder:EC - European Commission
Funding programme:European Regional Development Fund
Project number:KK.

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