Galvanostatic anodization of titanium—II. Reactions efficiencies and electrochemical behaviour model

Delplancke, Jean‐Luc; Winand, René

doi:10.1016/0013-4686(88)80224-x

Cited by 87 publications

(48 citation statements)

References 15 publications

(26 reference statements)

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“…(The explanation for the electrochemical processes involved in anodization can be found in several works (48)(49)(50)(79)(80)(81)(82)(83)(84).) The anodic oxide film growth is a two-stage process that results in either a thin or thick titanium oxide film: up to 160 V of applied voltage drop in the electrochemical cell, a linear growth in the nanometric range of the TiO 2 film is achieved (50); when anodization is carried out at higher voltages, an increased gas evolution and often sparking are obtained, resulting in titanium oxide films up to tenth µm thickness.…”

Section: Anodic Oxidationmentioning

confidence: 99%

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

et al. 2011

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Int J Artif Organs ( 2011; : 9) 929-946 34 TITANIUM OXIDE AND ANTIBACTERIAL SURFACES IN BIOMEDICAL DEVICES Device-related infections: a clinical demand driving material science researchAn increasing number of clinical procedures requires the use of biomedical devices, whose widespread presence in modern therapeutic treatments is driving the demand for better performances and longer reliability. One of the major issues of both short-term devices and implantable prostheses is represented by device-related infections (DRIs) Accepted: August 31, 2011 rEViEW due to bacterial colonization and proliferation (1). About half of the 2 million cases of nosocomial infections that occur each year in the United States are associated with indwelling devices (2): these infections generally require a longer period of antibiotic therapy and repeated surgical procedures, resulting in potential risks for the patient and increased costs for the healthcare system. The planktonic bacteria that colonize a device surface tend to form a biofilm and the sessile bacterial cells, enclosed in a self-produced polymeric matrix of this kind, can withstand host immune responses and generally show extraordinary antibiotic resistance (3). Eventually, bacteria rapid multiply and disperse in planktonic form, giving rise

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Section: Anodic Oxidationmentioning

confidence: 99%

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

et al. 2011

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“…Anodization of titanium and its alloys has been investigated by many groups, and the mechanisms governing oxide formation and growth are well established. For pure Ti, the thickness of compact TiO 2 layers changes linearly with the applied potential with 2.5 nm/V up to potentials where dielectric breakdown of the oxide occurs [3][4][5] -these breakdown potentials are typically in the order of 100 -200 V. Also, the anodization of the biomedical alloys Ti6Al-4V and Ti-6Al-7Nb has been investigated to some extent. 6 -8 In the biomaterials context, the main reason for an anodization treatment of titanium and its alloys is to achieve thicker and more stable TiO 2 based oxides, which are generally favorable for the surface bioactivity and, for example, to facilitate osseointegration.…”

Section: Introductionmentioning

confidence: 99%

Self‐organized nanotubular oxide layers on Ti‐6Al‐7Nb and Ti‐6Al‐4V formed by anodization in NH₄F solutions

Macák

Tsuchiya

Taveira

et al. 2005

J Biomedical Materials Res

260

163

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The present work reports the fabrication of self-organized porous oxide-nanotube layers on the biomedical titanium alloys Ti-6Al-7Nb and Ti-6Al-4V by a simple electrochemical treatment. These two-phase alloys were anodized in 1M (NH(4))(2)SO(4) electrolytes containing 0.5 wt % of NH(4)F. The results show that under specific anodization conditions self-organized porous oxide structures can be grown on the alloy surface. SEM images revealed that the porous layers consist of arrays of single nanotubes with a diameter of 100 nm and a spacing of 150 nm. For the V-containing alloy enhanced etching of the beta phase is observed, leading to selective dissolution and an inhomogeneous pore formation. For the Nb-containing alloy an almost ideal coverage of both phases is obtained. According to XPS measurements the tubes are a mixed oxide with an almost stoichiometric oxide composition, and can be grown to thicknesses of several hundreds of nanometers. These findings represent a simple surface treatment for Ti alloys that has high potential for biomedical applications.

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“…Because the material is mostly determined for a given application, there exists only a limited choice of alternatives. Generally, the extent of oxygen evolution is lowest for galvanostatic polarization at high current densities (Delplancke & Winand 1988;Blackwood & Peter 1989;Scharnweber et al 2002). However, this recommendation may conflict with the pH drop owing to hydronium ion generation, which is higher for higher current densities.…”

Section: Anodic Polarizationmentioning

confidence: 85%

Biological nano-functionalization of titanium-based biomaterial surfaces: a flexible toolbox

Beutner

Michael

Schwenzer

et al. 2009

J. R. Soc. Interface.

110

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Surface functionalization with bioactive molecules (BAMs) on a nanometre scale is a main field in current biomaterial research. The immobilization of a vast number of substances and molecules, ranging from inorganic calcium phosphate phases up to peptides and proteins, has been investigated throughout recent decades. However, in vitro and in vivo results are heterogeneous. This may be at least partially attributed to the limits of the applied immobilization methods. Therefore, this paper highlights, in the first part, advantages and limits of the currently applied methods for the biological nano-functionalization of titanium-based biomaterial surfaces. The second part describes a new immobilization system recently developed in our groups. It uses the nanomechanical fixation of at least partially single-stranded nucleic acids (NAs) into an anodic titanium oxide layer as an immobilization principle and their hybridization ability for the functionalization of the surface with BAMs conjugated to the respective complementary NA strands.

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Galvanostatic anodization of titanium—II. Reactions efficiencies and electrochemical behaviour model

Cited by 87 publications

References 15 publications

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

Self‐organized nanotubular oxide layers on Ti‐6Al‐7Nb and Ti‐6Al‐4V formed by anodization in NH₄F solutions

Biological nano-functionalization of titanium-based biomaterial surfaces: a flexible toolbox

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Galvanostatic anodization of titanium—II. Reactions efficiencies and electrochemical behaviour model

Cited by 87 publications

References 15 publications

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

Self‐organized nanotubular oxide layers on Ti‐6Al‐7Nb and Ti‐6Al‐4V formed by anodization in NH4F solutions

Biological nano-functionalization of titanium-based biomaterial surfaces: a flexible toolbox

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Self‐organized nanotubular oxide layers on Ti‐6Al‐7Nb and Ti‐6Al‐4V formed by anodization in NH₄F solutions