Adsorption of Polyions on Flat TiO<sub>2</sub> Surface

In this study, the surface properties of Ti/TiO<sub>2</sub> 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-styrenesulfonat...

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Autores principales:	Tin Klačić, Jozefina Katić, Danijel Namjesnik, Jasmina Jukić, Davor Kovačević, Tajana Begović
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	titanium/titanium dioxide surface polyelectrolytes ellipsometry atomic force microscopy cyclic voltammetry electrochemical impedance spectroscopy Mineralogy QE351-399.2
Acceso en línea:	https://doaj.org/article/faea97cc40254550814226dd9afca1a5
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id	oai:doaj.org-article:faea97cc40254550814226dd9afca1a5
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spelling	oai:doaj.org-article:faea97cc40254550814226dd9afca1a52021-11-25T18:25:54ZAdsorption of Polyions on Flat TiO<sub>2</sub> Surface10.3390/min111111642075-163Xhttps://doaj.org/article/faea97cc40254550814226dd9afca1a52021-10-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1164https://doaj.org/toc/2075-163XIn this study, the surface properties of Ti/TiO<sub>2</sub> 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/TiO<sub>2</sub> 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 TiO<sub>2</sub> 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.Tin KlačićJozefina KatićDanijel NamjesnikJasmina JukićDavor KovačevićTajana BegovićMDPI AGarticletitanium/titanium dioxide surfacepolyelectrolytesellipsometryatomic force microscopycyclic voltammetryelectrochemical impedance spectroscopyMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1164, p 1164 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	titanium/titanium dioxide surface polyelectrolytes ellipsometry atomic force microscopy cyclic voltammetry electrochemical impedance spectroscopy Mineralogy QE351-399.2
spellingShingle	titanium/titanium dioxide surface polyelectrolytes ellipsometry atomic force microscopy cyclic voltammetry electrochemical impedance spectroscopy Mineralogy QE351-399.2 Tin Klačić Jozefina Katić Danijel Namjesnik Jasmina Jukić Davor Kovačević Tajana Begović Adsorption of Polyions on Flat TiO<sub>2</sub> Surface
description	In this study, the surface properties of Ti/TiO<sub>2</sub> 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/TiO<sub>2</sub> 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 TiO<sub>2</sub> 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.
format	article
author	Tin Klačić Jozefina Katić Danijel Namjesnik Jasmina Jukić Davor Kovačević Tajana Begović
author_facet	Tin Klačić Jozefina Katić Danijel Namjesnik Jasmina Jukić Davor Kovačević Tajana Begović
author_sort	Tin Klačić
title	Adsorption of Polyions on Flat TiO<sub>2</sub> Surface
title_short	Adsorption of Polyions on Flat TiO<sub>2</sub> Surface
title_full	Adsorption of Polyions on Flat TiO<sub>2</sub> Surface
title_fullStr	Adsorption of Polyions on Flat TiO<sub>2</sub> Surface
title_full_unstemmed	Adsorption of Polyions on Flat TiO<sub>2</sub> Surface
title_sort	adsorption of polyions on flat tio<sub>2</sub> surface
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/faea97cc40254550814226dd9afca1a5
work_keys_str_mv	AT tinklacic adsorptionofpolyionsonflattiosub2subsurface AT jozefinakatic adsorptionofpolyionsonflattiosub2subsurface AT danijelnamjesnik adsorptionofpolyionsonflattiosub2subsurface AT jasminajukic adsorptionofpolyionsonflattiosub2subsurface AT davorkovacevic adsorptionofpolyionsonflattiosub2subsurface AT tajanabegovic adsorptionofpolyionsonflattiosub2subsurface
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Adsorption of Polyions on Flat TiO<sub>2</sub> Surface

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