Role of phosphates in improvement of surface layer on titanium alloys for medical applications

• Autorzy: Krasicka-Cydzik E. , Kaczmarek A. , Arkusz K.
• Języki publikacji: EN

Abstrakty

EN

Protective properties of the oxide surface layer on titanium and its alloys can be tailored to desired applications by anodizing parameters. Electrochemical oxidation in various electrolytes as well as different scan rates during the very first seconds of polarization may improve the morphology, structure and chemical composition of oxide layers to enhance the use of titanium materials in electronics, photovoltaic and medicine. Phosphate electrolytes play specific role in the anodizing process. Besides forming compact barrier layer, they enable also to form oxide porous and nanostructural layers enriched in phosphates, which enhance their bioactivity. In the paper the influence of phosphate ions on formation oxide layers: porous (Fig. 1, 2), gel-like (Fig. 3) and nanostructural on titanium (Fig. 6) and its alloys Ti6Al4V and Ti6Al7Nb (Fig. 8) in phosphoric acid solutions was presented. Basing on morphological and chemical composition analysis (SEM, XPS) and the electrochemical tests (Fig. 2, 4, 5, 9) the effect of electrolyte concentration on the protective character and the corrosion potential of the examined layers was revealed. The enrichment of surface oxide layers with phosphates and fluorides, enhancing their bioactivity, was observed. Studies to use Ti/TiO2 systems as the platform of the electrochemical biosensors to detect H2O2 and glucose proved the opportunity to use this nanotubular material as a platform for 2nd generation biosensors.

PL

Ochronne własności warstw tlenkowych na materiałach tytanowych można kształtować pod kątem określonych zastosowań przez zmianę parametrów procesu anodowego. Metodą utleniania elektrochemicznego są formowane warstwy o zróżnicowanej morfologii, strukturze, składzie chemicznym i przewodności elektrycznej, co rozszerza spektrum zastosowań tych materiałów w elektronice, fotowoltaice oraz medycynie. Elektrolity fosforanowe pełnią szczególną rolę w procesach anodowania. Poza formowaniem zwartej warstwy ochronnej umożliwiają także formowanie tlenkowych warstw porowatych i nanostrukturalnych, wzbogaconych w fosforany nadające tym warstwom cechy bioaktywności. W pracy przedstawiono wpływ jonów fosforanowych na formowanie warstw tlenkowych: porowatych (rys. 1, 2), żelopodobnych (rys. 3) i nanostrukturalnych na tytanie (rys. 6) i jego stopach: Ti6Al4V i Ti6Al7Nb (rys. 8) w roztworach kwasu fosforowego. Na podstawie badań morfologicznych i składu chemicznego (SEM, XPS) oraz testów elektrochemicznych (rys. 2, 4, 5, 9) wykazano wpływ stężenia elektrolitu na ochronny charakter tych warstw oraz ich potencjał korozyjny. Zaobserwowano wzbogacenie anodowych tlenków w fosforany i fluorki, podnoszące ich bioaktywność w sztucznym płynie fizjologicznym (SBF). Podjęto także próby określenia przydatności układów Ti/TiO2 w charakterze podłoża dla bioczujników elektrochemicznych do wykrywania obecności H2O2 i glukozy.

Słowa kluczowe

EN

TiO2 nanotubes; anodizing process; phosphate electrolytes

PL

nanorurki TiO2; procesy anodowe; elektrolity fosforanowe

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2011
• Tom: Vol. 32, nr 4
• Strony: 485--489
• Opis fizyczny: Bibliogr. 44 poz., rys.

Twórcy

autor

Krasicka-Cydzik E.

autor

Kaczmarek A.

autor

Arkusz K.

• Zakład Inżynierii Biomedycznej, Uniwersytet Zielonogórski,

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