Conference Paper: Suppression of surface nickel concentration of nickel titanium shape memory alloys by plasma surface treatment

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Title	Suppression of surface nickel concentration of nickel titanium shape memory alloys by plasma surface treatment
Authors	Yeung, KWK Wu, SL Tu, H Chu, PK Liu, XY Lu, WW Luk, KDK Cheung, KMC
Issue Date	2011
Publisher	Springer
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 [How to Cite?]
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.
ISBN	978-1-4614-0197-1

DC Field	Value
dc.contributor.author	Yeung, KWK
dc.contributor.author	Wu, SL
dc.contributor.author	Tu, H
dc.contributor.author	Chu, PK
dc.contributor.author	Liu, XY
dc.contributor.author	Lu, WW
dc.contributor.author	Luk, KDK
dc.contributor.author	Cheung, KMC
dc.date.accessioned	2010-10-31T12:36:53Z
dc.date.available	2010-10-31T12:36:53Z
dc.date.issued	2011
dc.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.
dc.description.other	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
dc.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 [How to Cite?]
dc.identifier.epage	113
dc.identifier.hkuros	173206
dc.identifier.isbn	978-1-4614-0197-1
dc.identifier.spage	112
dc.identifier.uri	http://hdl.handle.net/10722/126583
dc.language	eng
dc.publisher	Springer
dc.relation.ispartof	SMST-2010: Global Solutions for Future Applications: Proceedings of the International Conference on Shape Memory and Superelastic Technology
dc.title	Suppression of surface nickel concentration of nickel titanium shape memory alloys by plasma surface treatment
dc.type	Conference_Paper

<?xml encoding="utf-8" version="1.0"?><item><contributor.author>Yeung, KWK</contributor.author><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><identifier.isbn>978-1-4614-0197-1</identifier.isbn><identifier.uri>http://hdl.handle.net/10722/126583</identifier.uri><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><language>eng</language><publisher>Springer</publisher><relation.ispartof>SMST-2010: Global Solutions for Future Applications: Proceedings of the International Conference on Shape Memory and Superelastic Technology</relation.ispartof><title>Suppression of surface nickel concentration of nickel titanium shape memory alloys by plasma surface treatment</title><type>Conference_Paper</type><identifier.hkuros>173206</identifier.hkuros><identifier.spage>112</identifier.spage><identifier.epage>113</identifier.epage><description.other>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</description.other></item>

Conference Paper: Suppression of surface nickel concentration of nickel titanium shape memory alloys by plasma surface treatment

The HKU Scholars Hub has contact details for these author(s).