Nickel release behavior and surface characteristics of porous NiTi shape memory alloy modified by different chemical processes

Journal of Biomedical Materials Research. Part a
Shuilin WuK D K Luk

Abstract

As a non-line-of-sight surface modification technique, chemical treatment is an effective method to treat porous NiTi with complex surface morphologies and large exposed areas due to its liquidity and low temperature. In the work described here, three different chemical processes are used to treat porous NiTi alloys. Our results show that H(2)O(2) treatment, NaOH treatment, and H(2)O(2) pre-treatment plus subsequent NaOH treatment can mitigate leaching of nickel from the alloy. The porous NiTi samples modified by the two latter processes favor deposition of a layer composed of Ca and P due to the formation of bioactive Na(2)TiO(3) on the surface. Among the three processes, H(2)O(2) pre-treatment plus subsequent NaOH modification is the most effective in suppressing nickel release. Small area X-ray photoelectron spectroscopy reveals that the surfaces treated by different chemical processes have different structures and compositions. The sample modified by the H(2)O(2) treatment is composed of rough TiO(2) on the outer surface and an oxide transition layer underneath whereas the sample treated by NaOH comprises a surface layer of titanium oxide and Na(2)TiO(3) together with a transition layer. The sample processed by the H(2)O(2)...Continue Reading

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Jan 26, 2007·Journal of Biomedical Materials Research. Part a·Shuilin WuK D K Luk

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Citations

Feb 13, 2013·Journal of Biomedical Materials Research. Part a·Shuilin WuPaul K Chu
Jun 24, 2014·Acta Biomaterialia·Mohsen Taheri AndaniMohammad Elahinia
Jan 26, 2018·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Brice Ilharreborde
Jun 3, 2010·Critical Reviews in Biotechnology·P C SuryawanshiR M Kothari
Aug 5, 2017·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Jason Pui Yin CheungKenneth Man-Chee Cheung
Jun 15, 2011·Journal of Materials Engineering and Performance·C PulletikurthiA McGoron

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