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Article: Nitrogen plasma-implanted nickel titanium alloys for orthopedic use

TitleNitrogen plasma-implanted nickel titanium alloys for orthopedic use
Authors
KeywordsCell viability
Nickel titanium shape memory alloys
Osteoblasts
Plasma immersion ion implantation
Surface treatment
Issue Date2007
PublisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/surfcoat
Citation
Surface And Coatings Technology, 2007, v. 201 n. 9-11 SPEC. ISS., p. 5607-5612 How to Cite?
AbstractNickel-titanium shape memory alloys (NiTi) have attracted much attention as orthopedic materials due to their shape memory effect and super-elasticity. However, this alloy consists of equal amounts of nickel and titanium and Ni is well known to cause allergy or other deleterious effects in living tissues. To improve the surface corrosion resistance and mitigate Ni leaching, we have modified the surface chemistry of this alloy with the aid of nitrogen plasma immersion ion implantation (PIII). The implanted surfaces were characterized by X-ray photoelectron spectroscopy (XPS). Electrochemical corrosion and nano-indentation tests were conducted to assess the corrosion resistance and surface hardness. Immersion tests were carried to investigate the extent of Ni leaching under simulated human body conditions and cell cultures employing enhanced green fluorescent protein mice osteoblasts were used to evaluate the cyto-compatibility of the materials. The XPS results reveal that a thin layer of TiN with higher hardness is formed on the surface after nitrogen-PIII. The corrosion resistance of the implanted sample is also superior to that of the untreated NiTi and SS. The release of Ni ions is significantly reduced compared to the untreated NiTi and both the treated and untreated NiTi alloys favor osteoblast attachment and proliferation. The sample with surface titanium nitride exhibits the largest degree of cell proliferation whereas stainless steel fares the worst. © 2006 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/147557
ISSN
2015 Impact Factor: 2.139
2015 SCImago Journal Rankings: 0.872
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorYeung, KWKen_HK
dc.contributor.authorPoon, RWYen_HK
dc.contributor.authorLiu, XMen_HK
dc.contributor.authorChu, PKen_HK
dc.contributor.authorChung, CYen_HK
dc.contributor.authorLiu, XYen_HK
dc.contributor.authorChan, Sen_HK
dc.contributor.authorLu, WWen_HK
dc.contributor.authorChan, Den_HK
dc.contributor.authorLuk, KDKen_HK
dc.contributor.authorCheung, KMCen_HK
dc.date.accessioned2012-05-29T06:04:33Z-
dc.date.available2012-05-29T06:04:33Z-
dc.date.issued2007en_HK
dc.identifier.citationSurface And Coatings Technology, 2007, v. 201 n. 9-11 SPEC. ISS., p. 5607-5612en_HK
dc.identifier.issn0257-8972en_HK
dc.identifier.urihttp://hdl.handle.net/10722/147557-
dc.description.abstractNickel-titanium shape memory alloys (NiTi) have attracted much attention as orthopedic materials due to their shape memory effect and super-elasticity. However, this alloy consists of equal amounts of nickel and titanium and Ni is well known to cause allergy or other deleterious effects in living tissues. To improve the surface corrosion resistance and mitigate Ni leaching, we have modified the surface chemistry of this alloy with the aid of nitrogen plasma immersion ion implantation (PIII). The implanted surfaces were characterized by X-ray photoelectron spectroscopy (XPS). Electrochemical corrosion and nano-indentation tests were conducted to assess the corrosion resistance and surface hardness. Immersion tests were carried to investigate the extent of Ni leaching under simulated human body conditions and cell cultures employing enhanced green fluorescent protein mice osteoblasts were used to evaluate the cyto-compatibility of the materials. The XPS results reveal that a thin layer of TiN with higher hardness is formed on the surface after nitrogen-PIII. The corrosion resistance of the implanted sample is also superior to that of the untreated NiTi and SS. The release of Ni ions is significantly reduced compared to the untreated NiTi and both the treated and untreated NiTi alloys favor osteoblast attachment and proliferation. The sample with surface titanium nitride exhibits the largest degree of cell proliferation whereas stainless steel fares the worst. © 2006 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_US
dc.publisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/surfcoaten_HK
dc.relation.ispartofSurface and Coatings Technologyen_HK
dc.subjectCell viabilityen_HK
dc.subjectNickel titanium shape memory alloysen_HK
dc.subjectOsteoblastsen_HK
dc.subjectPlasma immersion ion implantationen_HK
dc.subjectSurface treatmenten_HK
dc.titleNitrogen plasma-implanted nickel titanium alloys for orthopedic useen_HK
dc.typeArticleen_HK
dc.identifier.emailYeung, KWK:wkkyeung@hkucc.hku.hken_HK
dc.identifier.emailLu, WW:wwlu@hku.hken_HK
dc.identifier.emailChan, D:chand@hkucc.hku.hken_HK
dc.identifier.emailLuk, KDK:hcm21000@hku.hken_HK
dc.identifier.emailCheung, KMC:cheungmc@hku.hken_HK
dc.identifier.authorityYeung, KWK=rp00309en_HK
dc.identifier.authorityLu, WW=rp00411en_HK
dc.identifier.authorityChan, D=rp00540en_HK
dc.identifier.authorityLuk, KDK=rp00333en_HK
dc.identifier.authorityCheung, KMC=rp00387en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.surfcoat.2006.07.004en_HK
dc.identifier.scopuseid_2-s2.0-33846549402en_HK
dc.identifier.hkuros145951-
dc.identifier.hkuros136593-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33846549402&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume201en_HK
dc.identifier.issue9-11 SPEC. ISS.en_HK
dc.identifier.spage5607en_HK
dc.identifier.epage5612en_HK
dc.identifier.isiWOS:000246509400184-
dc.publisher.placeSwitzerlanden_HK
dc.identifier.scopusauthoridYeung, KWK=13309584700en_HK
dc.identifier.scopusauthoridPoon, RWY=34572161800en_HK
dc.identifier.scopusauthoridLiu, XM=8408205200en_HK
dc.identifier.scopusauthoridChu, PK=36040705700en_HK
dc.identifier.scopusauthoridChung, CY=8100842800en_HK
dc.identifier.scopusauthoridLiu, XY=8603933800en_HK
dc.identifier.scopusauthoridChan, S=55209636300en_HK
dc.identifier.scopusauthoridLu, WW=7404215221en_HK
dc.identifier.scopusauthoridChan, D=7402216545en_HK
dc.identifier.scopusauthoridLuk, KDK=7201921573en_HK
dc.identifier.scopusauthoridCheung, KMC=7402406754en_HK

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