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

TitleNickel release behavior and surface characteristics of porous NiTi shape memory alloy modified by different chemical processes
Authors
KeywordsChemical treatment
Nickel release
Porous NiTi shape memory alloy
Surface modification
XPS
Issue Date2009
PublisherJohn Wiley & Sons, Inc. The Journal's web site is located at http://www.interscience.wiley.com/jpages/0021-9304/
Citation
Journal Of Biomedical Materials Research - Part A, 2009, v. 89 n. 2, p. 483-489 How to Cite?
AbstractAs 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 H2O2 treatment, NaOH treatment, and H2O2 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 Na2TiO 3 on the surface. Among the three processes, H2O 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 2O2 treatment is composed of rough TiO2 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 2TiO3 together with a transition layer. The sample processed by the H2O2 and NaOH treatment has a pure Na2TiO3 layer on the surface and a transition layer underneath. These results help to elucidate the different nickel release behavior and bioactivity of porous NiTi alloys processed by different methods. © 2008 Wiley Periodicals, Inc.
Persistent Identifierhttp://hdl.handle.net/10722/139539
ISSN
2015 Impact Factor: 3.263
2015 SCImago Journal Rankings: 0.979
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Research Grants Council (RGG) Central Allocation Group ResearchCityU 1/04C
City University of Hong Kong Applied Research Grant (ARG)9667002
Funding Information:

Contract grant sponsor: City University of Hong Kong Applied Research Grant (ARG); contract grant number: 9667002

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorWu, Sen_HK
dc.contributor.authorLiu, Xen_HK
dc.contributor.authorChan, YLen_HK
dc.contributor.authorChu, PKen_HK
dc.contributor.authorChung, CYen_HK
dc.contributor.authorChu, Cen_HK
dc.contributor.authorYeung, KWKen_HK
dc.contributor.authorLu, WWen_HK
dc.contributor.authorCheung, KMCen_HK
dc.contributor.authorLuk, KDKen_HK
dc.date.accessioned2011-09-23T05:51:26Z-
dc.date.available2011-09-23T05:51:26Z-
dc.date.issued2009en_HK
dc.identifier.citationJournal Of Biomedical Materials Research - Part A, 2009, v. 89 n. 2, p. 483-489en_HK
dc.identifier.issn1549-3296en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139539-
dc.description.abstractAs 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 H2O2 treatment, NaOH treatment, and H2O2 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 Na2TiO 3 on the surface. Among the three processes, H2O 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 2O2 treatment is composed of rough TiO2 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 2TiO3 together with a transition layer. The sample processed by the H2O2 and NaOH treatment has a pure Na2TiO3 layer on the surface and a transition layer underneath. These results help to elucidate the different nickel release behavior and bioactivity of porous NiTi alloys processed by different methods. © 2008 Wiley Periodicals, Inc.en_HK
dc.languageengen_US
dc.publisherJohn Wiley & Sons, Inc. The Journal's web site is located at http://www.interscience.wiley.com/jpages/0021-9304/en_HK
dc.relation.ispartofJournal of Biomedical Materials Research - Part Aen_HK
dc.rightsJournal of Biomedical Materials Research Part A. Copyright © John Wiley & Sons, Inc.-
dc.subjectChemical treatmenten_HK
dc.subjectNickel releaseen_HK
dc.subjectPorous NiTi shape memory alloyen_HK
dc.subjectSurface modificationen_HK
dc.subjectXPSen_HK
dc.subject.meshBody Fluids-
dc.subject.meshChemical Processes-
dc.subject.meshNickel - analysis - chemistry-
dc.subject.meshPorosity-
dc.subject.meshTitanium - chemistry-
dc.titleNickel release behavior and surface characteristics of porous NiTi shape memory alloy modified by different chemical processesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1549-3296&volume=89&issue=2&spage=483&epage=489&date=2009&atitle=Nickel+release+behavior+and+surface+characteristics+of+porous+NiTi+shape+memory+alloy+modified+by+different+chemical+processes-
dc.identifier.emailYeung, KWK:wkkyeung@hkucc.hku.hken_HK
dc.identifier.emailLu, WW:wwlu@hku.hken_HK
dc.identifier.emailCheung, KMC:cheungmc@hku.hken_HK
dc.identifier.emailLuk, KDK:hcm21000@hku.hken_HK
dc.identifier.authorityYeung, KWK=rp00309en_HK
dc.identifier.authorityLu, WW=rp00411en_HK
dc.identifier.authorityCheung, KMC=rp00387en_HK
dc.identifier.authorityLuk, KDK=rp00333en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/jbm.a.32008en_HK
dc.identifier.pmid18431757-
dc.identifier.scopuseid_2-s2.0-65449124391en_HK
dc.identifier.hkuros192170en_US
dc.identifier.hkuros166287-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-65449124391&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume89en_HK
dc.identifier.issue2en_HK
dc.identifier.spage483en_HK
dc.identifier.epage489en_HK
dc.identifier.isiWOS:000264850200021-
dc.publisher.placeUnited Statesen_HK
dc.relation.projectDevelopment of novel materials for orthopaedics-
dc.relation.projectDevelopment of novel materials for orthopaedics-
dc.identifier.scopusauthoridWu, S=15125218800en_HK
dc.identifier.scopusauthoridLiu, X=8408205200en_HK
dc.identifier.scopusauthoridChan, YL=8250546500en_HK
dc.identifier.scopusauthoridChu, PK=36040705700en_HK
dc.identifier.scopusauthoridChung, CY=8100842800en_HK
dc.identifier.scopusauthoridChu, C=7404345713en_HK
dc.identifier.scopusauthoridYeung, KWK=13309584700en_HK
dc.identifier.scopusauthoridLu, WW=7404215221en_HK
dc.identifier.scopusauthoridCheung, KMC=7402406754en_HK
dc.identifier.scopusauthoridLuk, KDK=7201921573en_HK

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