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Article

Adsorption of Polyions on Flat TiO2 Surface

1
Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
2
Department of Electrochemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Savska cesta 16/I, 10000 Zagreb, Croatia
*
Authors to whom correspondence should be addressed.
Academic Editor: Paul Alexandre
Minerals 2021, 11(11), 1164; https://doi.org/10.3390/min11111164
Received: 27 September 2021 / Revised: 14 October 2021 / Accepted: 18 October 2021 / Published: 21 October 2021
(This article belongs to the Special Issue Ion Adsorption at Mineral–Water Interfaces)
In this study, the surface properties of Ti/TiO2 substrate before and after the adsorption of polyelectrolytes were investigated. As model polyelectrolytes, strongly charged polycation poly(diallyldimethylammonium) (PDADMA) and strongly charged polyanion poly(4-styrenesulfonate) (PSS) were used. Initially, the bare titanium substrate was characterized by means of ellipsometry, atomic force microscopy (AFM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and measurements of inner surface potential using crystal electrode (CrE). It was shown that the substrate surface is very smooth with the roughness of 3.5 nm and oxide layer thickness of 3.8 nm. After the adsorption of PDADMA and PSS, polyelectrolyte-coated titanium surface was examined using the above-mentioned methods under the same conditions. It was found that both PDADMA cations and PSS anions form a stable polymeric nanofilm on Ti/TiO2 surface that partially covers the surface, without significant impact on the surface roughness. The corrosion protection effectiveness values indicate that the corrosion properties were greatly enhanced upon polyion adsorption and polyelectrolyte coating formation on the flat TiO2 surface. The obtained results were additionally confirmed by inner surface potential measurements. According to the methods employed, PDADMA nanofilm modification offers enhanced corrosion protection to the underlying titanium material in sodium chloride electrolyte solution. View Full-Text
Keywords: titanium/titanium dioxide surface; polyelectrolytes; ellipsometry; atomic force microscopy; cyclic voltammetry; electrochemical impedance spectroscopy; surface potential measurements titanium/titanium dioxide surface; polyelectrolytes; ellipsometry; atomic force microscopy; cyclic voltammetry; electrochemical impedance spectroscopy; surface potential measurements
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MDPI and ACS Style

Klačić, T.; Katić, J.; Namjesnik, D.; Jukić, J.; Kovačević, D.; Begović, T. Adsorption of Polyions on Flat TiO2 Surface. Minerals 2021, 11, 1164. https://doi.org/10.3390/min11111164

AMA Style

Klačić T, Katić J, Namjesnik D, Jukić J, Kovačević D, Begović T. Adsorption of Polyions on Flat TiO2 Surface. Minerals. 2021; 11(11):1164. https://doi.org/10.3390/min11111164

Chicago/Turabian Style

Klačić, Tin, Jozefina Katić, Danijel Namjesnik, Jasmina Jukić, Davor Kovačević, and Tajana Begović. 2021. "Adsorption of Polyions on Flat TiO2 Surface" Minerals 11, no. 11: 1164. https://doi.org/10.3390/min11111164

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