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国家自然科学基金(50501007)

作品数:6 被引量:31H指数:4
相关作者:朱剑豪林萍华储成林董寅生浦跃朴更多>>
相关机构:东南大学香港城市大学南京医科大学更多>>
发文基金:国家自然科学基金教育部“新世纪优秀人才支持计划”江苏省自然科学基金更多>>
相关领域:金属学及工艺医药卫生一般工业技术更多>>

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In situ synthesis of nanostructured titania film on NiTi shape memory alloy by Fenton’s oxidation method被引量:3
2007年
Fenton’s oxidation method was successfully used to synthesize an ideal titania film in situ on NiTi shape memory alloy(SMA) for medical applications. Characterized with scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffractometry, inductively coupled plasma mass spectrometry and electrochemical tests, it is found that the titania film produced by Fenton’s oxidation method on NiTi SMA is nanostructured and has a Ni-free zone near its top surface, which results in a notable improvement in corrosion resistance and a remarkable decrease in leaching of harmful Ni ions from NiTi SMA in simulated body fluids. The improvement of effectiveness to corrosion resistance and the reduction in Ni release of NiTi SMA by Fenton’s oxidation method are comparable to those by oxygen plasma immersion ion implantation reported earlier.
储成林胡涛S.L.Wu王如萌董寅生林萍华C.Y.ChungP.K.Chu
关键词:NITI记忆合金
镍钛合金光催化高级氧化表面改性与生物相容性被引量:5
2008年
在UV/H2O2光催化体系中,通过高级氧化法在NiTi SMA表面生成贫Ni的Ti氧化膜。通过亲水性试验、血小板黏附试验以及MTT细胞毒性试验对改性后试样的生物相容性进行了系统的评价,研究发现改性后试样的亲水性得到明显改善。表面血小板黏附数量减少,变形和团聚现象得到抑制,形成血栓的可能性降低,血液相容性得到提高。改性后试样的细胞相对增殖率(RGR)高于化学抛光的试样,试样周围细胞分裂增生良好,与材料边缘结合自然,改性处理同样提高了试样的细胞相容性。结果表明光催化高级氧化是提高NiTiSMA生物相容性的一种有效方法。
王如萌储成林李艳芬尹立红浦跃朴董寅生林萍华朱剑豪
关键词:血液相容性细胞相容性
In vitro biocompatibility of titanium-nickel alloy with titanium oxide film by H_2O_2 oxidation被引量:6
2007年
Titanium oxide film with a graded interface to NiTi matrix was synthesized in situ on NiTi shape memory alloy(SMA) by oxidation in H2O2 solution. In vitro studies including contact angle measurement, hemolysis, MTT cytotoxicity and cell morphology tests were employed to investigate the biocompatibility of the H2O2-oxidized NiTi SMAs with this titanium oxide film. The results reveal that wettability, blood compatibility and fibroblasts compatibility of NiTi SMA are improved by the coating of titanium oxide film through H2O2 oxidation treatment.
胡涛储成林尹立红浦跃朴董寅生郭超盛晓波钟志源朱剑豪
关键词:记忆合金润湿性能氧化物
镍钛合金的高级氧化法表面改性及其血液相容性研究被引量:16
2007年
通过高级氧化法对NiTi形状记忆合金进行表面改性,SEM和TF-XRD分析证实,羟自由基(·OH)氧化后的NiTi形状记忆合金表面生成了金红石和锐钛矿结构的二氧化钛薄膜。通过测定动态凝血时间、溶血率和研究血小板黏附行为等方法进行了血液相容性评估。结果表明,经高级氧化法表面改性后的NiTi形状记忆合金血液相容性获得了明显的改善。
胡涛储成林孙卫斌王娟周静艳董寅生浦跃朴林萍华朱剑豪
关键词:NITI形状记忆合金二氧化钛薄膜血液相容性
Effects of heat treatment on characteristics of porous Ni-rich NiTi SMA prepared by SHS technique被引量:4
2006年
The effects of heat treatment on the microstructure and compressive properties of porous Ni-rich NiTi shape memory alloy (SMA) fabricated by self-propagating high-temperature synthesis (SHS) were investigated. The solution treatment at 1050℃ has little effects on stable Ti2Ni second phase, however, it decreases the amount of Ni4Ti3 phase derived from the SHS process and results in the improvement of the ductility of porous NiTi SMA. The subsequent aging treatment after solution treatment could lead to the precipitation of the discrete Ni4Ti3 phase in NiTi matrix grains, which increases the brittleness of porous NiTi SMA. Porous NiTi SMA presents a composite fracture behavior consisting of a ductile fracture of NiTi matrix and a cleavage fracture of second phase particles. Many cracks existing on the interfaces indicate that the bonding of the matrix with second phase particles is weak.
储成林钟志源朱剑豪
关键词:NITI
Effects of H_2O_2 pretreatment on surface characteristics and bioactivity of NaOH-treated NiTi shape memory alloy
2006年
The effects of H2O2 pretreatment on the surface characteristics and bioactivity of NaOH-treated NiTi shape memory alloy(SMA)were investigated by scanning electron microscopy,X-ray diffraction,X-ray photoelectron spectroscopy,Raman spectra,Fourier transform infrared spectroscopy as well as a simulated body fluid(SBF)soaking test.It is found that the H2O2 pretreatment can lead to the direct creation of more Ti—OH groups and the decrease in the amount of Ni2O3,Na2TiO3 and remnant NiTi phases on the surfaces of bioactive NiTi SMA prepared by NaOH treatment.As a result,the induction period of apatite formation is shortened by dispensing with the slow kinetic formation process of Ti—OH groups via an exchange of Na+ ions from Na2TiO3 phase with H3O+ ions in SBF,which indicates that the bioactivity of NaOH-treated NiTi SMA can be further improved by the H2O2 pretreatment.
储成林胡涛周俊浦跃朴尹立红董寅生林萍华钟志源朱剑豪
关键词:NITINAOHH2O2PRETREATMENT
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