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Tailoring the surface properties of Ti6Al4V by controlled chemical oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
9667 642 2008 14 PDF Available
Title
Tailoring the surface properties of Ti6Al4V by controlled chemical oxidation
Abstract

Many efforts have been made to promote cell activity at the surface of implants, mainly by modifying their topography and physicochemical properties. Here we demonstrate the feasibility of creating Ti6Al4V surfaces having both a microtexture and a nanotexture, and show that their properties can be tailored by controlling the length of exposure to a mixture of H2SO4 and H2O2. Scanning electron microscopy (SEM), combined with energy-dispersive X-ray spectroscopy (EDX), indicated that β-phase grains, which surround larger α-phase grains, are etched more rapidly, resulting in a surface composed of microscale cavities with α-grain boundaries. Furthermore, high-resolution SEM and atomic force microscopy (AFM) revealed the presence on the surfaces of both α- and β-phase grains of a network of nanopits with mean diameters ranging between 13 and 21 nm. The grain surface roughness increases from about 4 nm on untreated samples to about 12 nm after 4 h of treatment. AFM analysis showed that the depth of microscale cavities can be varied in the 10–180 nm range by controlling the extent of chemical etching. Fourier transform infrared spectroscopy (FT-IR), combined with ellipsometry, established that the etching generated an oxide layer with a thickness in the range 15–45 nm. The resulting new surfaces selectively promote the growth of osteoblasts while inhibiting that of fibroblasts, making them promising tools for regulating the activities of cells in biological environments.

Keywords
Bioactivity; Cell proliferation; Nanotopography; Surface modification; Titanium alloy; Titanium oxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 29, Issue 10, April 2008, Pages 1285–1298
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us