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Article: Surface structure and properties of biomedical NiTi shape memory alloy after Fenton's oxidation

TitleSurface structure and properties of biomedical NiTi shape memory alloy after Fenton's oxidation
Authors
Issue Date2007
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/actabiomat
Citation
Acta Biomaterialia, 2007, v. 3 n. 5, p. 795-806 How to Cite?
AbstractFenton's oxidation is traditionally used to remove inorganic and organic pollutants from water in waster water treatment. It is an advanced oxidation process in which H2O2 is catalytically decomposed by ferrous irons into hydroxyl radicals ({radical dot}OH) which have a higher oxidation potential (2.8 V) than H2O2. In the work reported here, we for the first time use Fenton's oxidation to modify the surface of biomedical NiTi shape memory alloy (SMA). The influences of Fenton's oxidation on the surface microstructure, blood compatibility, leaching of harmful Ni ions and corrosion resistance in simulated body fluids is assessed using scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma mass spectrometry, electrochemical tests, hemolysis analysis and the blood platelet adhesion test. The mechanical stability of the surface titania film produced by Fenton's oxidation as well as their effects on the shape memory behavior of the SMA are studied by bending tests. Our results show that Fenton's oxidation produces a novel nanostructured titania gel film with a graded structure on the NiTi substrate without an intermediate Ni-rich layer that is typical of high-temperature oxidation. Moreover, there is a clear Ni-free zone near the top surface of the titania film. The surface structural changes introduced by Fenton's oxidation improve the electrochemical corrosion resistance and mitigate Ni release. The latter effects are comparable to those observed after oxygen plasma immersion ion implantation reported previously and better than those of high-temperature oxidation. Aging in boiling water improves the crystallinity of the titania film and further reduces Ni leaching. Blood platelet adhesion is remarkably reduced after Fenton's oxidation, suggesting that the treated SMA has improved thrombo resistance. Enhancement of blood compatibility is believed to stem from the improved hemolysis resistance, the surface wettability and the intrinsic electrical characteristics of the titania film. The titania film produced by Fenton's oxidation has good mechanical stability and does not adversely impact the shape memory behavior of NiTi. Our work suggests that Fenton's oxidation is a promising low-temperature, low-cost surface modification method for improving the surface properties of biomedical NiTi SMA. © 2007 Acta Materialia Inc.
Persistent Identifierhttp://hdl.handle.net/10722/170113
ISSN
2015 Impact Factor: 6.008
2015 SCImago Journal Rankings: 2.020
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChu, CLen_US
dc.contributor.authorHu, Ten_US
dc.contributor.authorWu, SLen_US
dc.contributor.authorDong, YSen_US
dc.contributor.authorYin, LHen_US
dc.contributor.authorPu, YPen_US
dc.contributor.authorLin, PHen_US
dc.contributor.authorChung, CYen_US
dc.contributor.authorYeung, KWKen_US
dc.contributor.authorChu, PKen_US
dc.date.accessioned2012-10-30T06:05:24Z-
dc.date.available2012-10-30T06:05:24Z-
dc.date.issued2007en_US
dc.identifier.citationActa Biomaterialia, 2007, v. 3 n. 5, p. 795-806en_US
dc.identifier.issn1742-7061en_US
dc.identifier.urihttp://hdl.handle.net/10722/170113-
dc.description.abstractFenton's oxidation is traditionally used to remove inorganic and organic pollutants from water in waster water treatment. It is an advanced oxidation process in which H2O2 is catalytically decomposed by ferrous irons into hydroxyl radicals ({radical dot}OH) which have a higher oxidation potential (2.8 V) than H2O2. In the work reported here, we for the first time use Fenton's oxidation to modify the surface of biomedical NiTi shape memory alloy (SMA). The influences of Fenton's oxidation on the surface microstructure, blood compatibility, leaching of harmful Ni ions and corrosion resistance in simulated body fluids is assessed using scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma mass spectrometry, electrochemical tests, hemolysis analysis and the blood platelet adhesion test. The mechanical stability of the surface titania film produced by Fenton's oxidation as well as their effects on the shape memory behavior of the SMA are studied by bending tests. Our results show that Fenton's oxidation produces a novel nanostructured titania gel film with a graded structure on the NiTi substrate without an intermediate Ni-rich layer that is typical of high-temperature oxidation. Moreover, there is a clear Ni-free zone near the top surface of the titania film. The surface structural changes introduced by Fenton's oxidation improve the electrochemical corrosion resistance and mitigate Ni release. The latter effects are comparable to those observed after oxygen plasma immersion ion implantation reported previously and better than those of high-temperature oxidation. Aging in boiling water improves the crystallinity of the titania film and further reduces Ni leaching. Blood platelet adhesion is remarkably reduced after Fenton's oxidation, suggesting that the treated SMA has improved thrombo resistance. Enhancement of blood compatibility is believed to stem from the improved hemolysis resistance, the surface wettability and the intrinsic electrical characteristics of the titania film. The titania film produced by Fenton's oxidation has good mechanical stability and does not adversely impact the shape memory behavior of NiTi. Our work suggests that Fenton's oxidation is a promising low-temperature, low-cost surface modification method for improving the surface properties of biomedical NiTi SMA. © 2007 Acta Materialia Inc.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/actabiomaten_US
dc.relation.ispartofActa Biomaterialiaen_US
dc.subject.meshAlloys - Chemistryen_US
dc.subject.meshAnimalsen_US
dc.subject.meshBiocompatible Materials - Chemistryen_US
dc.subject.meshCells, Cultureden_US
dc.subject.meshCorrosionen_US
dc.subject.meshHydrogen Peroxide - Chemistryen_US
dc.subject.meshIron - Chemistryen_US
dc.subject.meshNickel - Chemistryen_US
dc.subject.meshOxidation-Reductionen_US
dc.subject.meshPlatelet Adhesiveness - Physiologyen_US
dc.subject.meshRabbitsen_US
dc.subject.meshSurface Propertiesen_US
dc.subject.meshTitanium - Chemistryen_US
dc.titleSurface structure and properties of biomedical NiTi shape memory alloy after Fenton's oxidationen_US
dc.typeArticleen_US
dc.identifier.emailYeung, KWK:wkkyeung@hkucc.hku.hken_US
dc.identifier.authorityYeung, KWK=rp00309en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.actbio.2007.03.002en_US
dc.identifier.pmid17466609-
dc.identifier.scopuseid_2-s2.0-34547686578en_US
dc.identifier.hkuros192136-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34547686578&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume3en_US
dc.identifier.issue5en_US
dc.identifier.spage795en_US
dc.identifier.epage806en_US
dc.identifier.isiWOS:000249625300020-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridChu, CL=7404345713en_US
dc.identifier.scopusauthoridHu, T=25948400300en_US
dc.identifier.scopusauthoridWu, SL=15125218800en_US
dc.identifier.scopusauthoridDong, YS=7403390573en_US
dc.identifier.scopusauthoridYin, LH=8090267900en_US
dc.identifier.scopusauthoridPu, YP=7103191509en_US
dc.identifier.scopusauthoridLin, PH=7403225139en_US
dc.identifier.scopusauthoridChung, CY=8100842800en_US
dc.identifier.scopusauthoridYeung, KWK=13309584700en_US
dc.identifier.scopusauthoridChu, PK=36040705700en_US

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