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Conference Paper: Suppression of surface nickel concentration of nickel titanium shape memory alloys by plasma surface treatment
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TitleSuppression of surface nickel concentration of nickel titanium shape memory alloys by plasma surface treatment
 
AuthorsYeung, KWK
Wu, SL
Tu, H
Chu, PK
Liu, XY
Lu, WW
Luk, KDK
Cheung, KMC
 
Issue Date2011
 
PublisherSpringer
 
CitationThe International Conference on Shape Memory and Superelastic Technologies (SMST), Pacific Grove, CA., 16-20 May 2010. In SMST-2010: Global Solutions for Future Applications: Proceedings of the International Conference on Shape Memory and Superelastic Technology, 2011, p. 112-113 [How to Cite?]
 
AbstractNickel-titanium shape-memory alloys (NiTi) has very good potential for surgical implantation due to two unique properties: super-elasticity and shape memory effect. These advantages cannot be seen in current biomedical metallic materials. However, nickel ion release remains a major concern particularly for large implants placed on the spine, as fretting is always expected at such implant junctions. We have invented an advanced surface treatment using plasma immersion ion implantation (PIII) technology to tackle this issue. This paper describes the efficacy of nickel suppression in NiTi alloys by using plasma surface treatment. NiTi discs with 50.8% Ni were treated by nitrogen, oxygen and carbon PIII at 40kV with the frequency of 200Hz. The treated samples were then subjected to chemical analysis by X-ray Photoelectron Spectroscopy (XPS) and electrochemical corrosion testing by potentiometer. After completing the corrosion test, the solutions were extracted for ICPMS analysis so as to investigate the amount of Ni release. Cytocompatibility of PIII treated samples using mouse osteoblasts and in-vivo compatibility were also examined. By reading the XPS results, the surfaces were enriched by titanium nitride (TiN), titanium oxide (TiO) and titanium carbide (TiC) after PIII treatments, respectively. The surface Ni concentration of all treated samples was significantly suppressed. To compare with the untreated sample, the corrosion properties of the plasma treated samples had been improved by a factor of five. The leached Ni levels from the treated samples were undetectable, whereas that from the untreated samples was 30ppm. Cells were well tolerated on plasma treated and untreated samples at Day 7 of culturing. Although there was no significant difference in cell proliferation on either surfaces, the in vivo bone formation was found to be better on the nitrogen and carbon treated surfaces at every time points. Therefore, the treated NiTi is promising orthopedic implantation without inducing harmful effects. SUMMARY: Nickel-titanium shape memory alloys (NiTi) has very good potential for surgical implantation due to two unique properties: super-elasticity and shape memory effect. These advantages cannot be seen in current biomedical metallic materials. However, nickel ion release remains a major concern particularly for large implants placed on the spine, as fretting is always expected at such implant junctions. We have invented an advanced surface treatment using plasma immersion ion implantation (PIII) technology to tackle this issue. This paper describes the efficacy of nickel suppression in NiTi alloys by using plasma surface treatment.
 
ISBN978-1-4614-0197-1
 
DC FieldValue
dc.contributor.authorYeung, KWK
 
dc.contributor.authorWu, SL
 
dc.contributor.authorTu, H
 
dc.contributor.authorChu, PK
 
dc.contributor.authorLiu, XY
 
dc.contributor.authorLu, WW
 
dc.contributor.authorLuk, KDK
 
dc.contributor.authorCheung, KMC
 
dc.date.accessioned2010-10-31T12:36:53Z
 
dc.date.available2010-10-31T12:36:53Z
 
dc.date.issued2011
 
dc.description.abstractNickel-titanium shape-memory alloys (NiTi) has very good potential for surgical implantation due to two unique properties: super-elasticity and shape memory effect. These advantages cannot be seen in current biomedical metallic materials. However, nickel ion release remains a major concern particularly for large implants placed on the spine, as fretting is always expected at such implant junctions. We have invented an advanced surface treatment using plasma immersion ion implantation (PIII) technology to tackle this issue. This paper describes the efficacy of nickel suppression in NiTi alloys by using plasma surface treatment. NiTi discs with 50.8% Ni were treated by nitrogen, oxygen and carbon PIII at 40kV with the frequency of 200Hz. The treated samples were then subjected to chemical analysis by X-ray Photoelectron Spectroscopy (XPS) and electrochemical corrosion testing by potentiometer. After completing the corrosion test, the solutions were extracted for ICPMS analysis so as to investigate the amount of Ni release. Cytocompatibility of PIII treated samples using mouse osteoblasts and in-vivo compatibility were also examined. By reading the XPS results, the surfaces were enriched by titanium nitride (TiN), titanium oxide (TiO) and titanium carbide (TiC) after PIII treatments, respectively. The surface Ni concentration of all treated samples was significantly suppressed. To compare with the untreated sample, the corrosion properties of the plasma treated samples had been improved by a factor of five. The leached Ni levels from the treated samples were undetectable, whereas that from the untreated samples was 30ppm. Cells were well tolerated on plasma treated and untreated samples at Day 7 of culturing. Although there was no significant difference in cell proliferation on either surfaces, the in vivo bone formation was found to be better on the nitrogen and carbon treated surfaces at every time points. Therefore, the treated NiTi is promising orthopedic implantation without inducing harmful effects. SUMMARY: Nickel-titanium shape memory alloys (NiTi) has very good potential for surgical implantation due to two unique properties: super-elasticity and shape memory effect. These advantages cannot be seen in current biomedical metallic materials. However, nickel ion release remains a major concern particularly for large implants placed on the spine, as fretting is always expected at such implant junctions. We have invented an advanced surface treatment using plasma immersion ion implantation (PIII) technology to tackle this issue. This paper describes the efficacy of nickel suppression in NiTi alloys by using plasma surface treatment.
 
dc.description.otherThe International Conference on Shape Memory and Superelastic Technologies (SMST), Pacific Grove, CA., 16-20 May 2010. In SMST-2010: Global Solutions for Future Applications: Proceedings of the International Conference on Shape Memory and Superelastic Technology, 2011, p. 112-113
 
dc.identifier.citationThe International Conference on Shape Memory and Superelastic Technologies (SMST), Pacific Grove, CA., 16-20 May 2010. In SMST-2010: Global Solutions for Future Applications: Proceedings of the International Conference on Shape Memory and Superelastic Technology, 2011, p. 112-113 [How to Cite?]
 
dc.identifier.epage113
 
dc.identifier.hkuros173206
 
dc.identifier.isbn978-1-4614-0197-1
 
dc.identifier.spage112
 
dc.identifier.urihttp://hdl.handle.net/10722/126583
 
dc.languageeng
 
dc.publisherSpringer
 
dc.relation.ispartofSMST-2010: Global Solutions for Future Applications: Proceedings of the International Conference on Shape Memory and Superelastic Technology
 
dc.titleSuppression of surface nickel concentration of nickel titanium shape memory alloys by plasma surface treatment
 
dc.typeConference_Paper
 
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<contributor.author>Wu, SL</contributor.author>
<contributor.author>Tu, H</contributor.author>
<contributor.author>Chu, PK</contributor.author>
<contributor.author>Liu, XY</contributor.author>
<contributor.author>Lu, WW</contributor.author>
<contributor.author>Luk, KDK</contributor.author>
<contributor.author>Cheung, KMC</contributor.author>
<date.accessioned>2010-10-31T12:36:53Z</date.accessioned>
<date.available>2010-10-31T12:36:53Z</date.available>
<date.issued>2011</date.issued>
<identifier.citation>The International Conference on Shape Memory and Superelastic Technologies (SMST), Pacific Grove, CA., 16-20 May 2010. In SMST-2010: Global Solutions for Future Applications: Proceedings of the International Conference on Shape Memory and Superelastic Technology, 2011, p. 112-113</identifier.citation>
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<description.abstract>Nickel-titanium shape-memory alloys (NiTi) has very good potential for surgical implantation due to two unique properties: super-elasticity and shape memory effect.  These advantages cannot be seen in current biomedical metallic materials.  However, nickel ion release remains a major concern particularly for large implants placed on the spine, as fretting is always expected at such implant junctions. We have invented an advanced surface treatment using plasma immersion ion implantation (PIII) technology to tackle this issue. This paper describes the efficacy of nickel suppression in NiTi alloys by using plasma surface treatment. NiTi discs with 50.8% Ni were treated by nitrogen, oxygen and carbon PIII at 40kV with the frequency of 200Hz.  The treated samples were then subjected to chemical analysis by X-ray Photoelectron Spectroscopy (XPS) and electrochemical corrosion testing by potentiometer.  After completing the corrosion test, the solutions were extracted for ICPMS analysis so as to investigate the amount of Ni release. Cytocompatibility of PIII treated samples using mouse osteoblasts and in-vivo compatibility were also examined.  By reading the XPS results, the surfaces were enriched by titanium nitride (TiN), titanium oxide (TiO) and titanium carbide (TiC) after PIII treatments, respectively. The surface Ni concentration of all treated samples was significantly suppressed.  To compare with the untreated sample, the corrosion properties of the plasma treated samples had been improved by a factor of five.  The leached Ni levels from the treated samples were undetectable, whereas that from the untreated samples was 30ppm.  Cells were well tolerated on plasma treated and untreated samples at Day 7 of culturing.  Although there was no significant difference in cell proliferation on either surfaces, the in vivo bone formation was found to be better on the nitrogen and carbon treated surfaces at every time points. Therefore, the treated NiTi is promising orthopedic implantation without inducing harmful effects. SUMMARY: Nickel-titanium shape memory alloys (NiTi) has very good potential for surgical implantation due to two unique properties: super-elasticity and shape memory effect. These advantages cannot be seen in current biomedical metallic materials. However, nickel ion release remains a major concern particularly for large implants placed on the spine, as fretting is always expected at such implant junctions. We have invented an advanced surface treatment using plasma immersion ion implantation (PIII) technology to tackle this issue. This paper describes the efficacy of nickel suppression in NiTi alloys by using plasma surface treatment.</description.abstract>
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