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A Comparative in vitro Study on Biomedical Zr-2.5X(X=Nb,Sn) Alloys

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journal of Materials Science & Technology 2014年第4期30卷 299-306页

作者： F.Y.Zhou K.j.qiu D.Bian Y.F.Zheng j.P.Lin Centre for Biomedical Materials and Engineering Harbin Engineering University Department of Materials Science and Engineering College of EngineeringPeking University State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

Nb and Sn are major alloying elements in Zr alloys. In this study, the microstructure, mechanical properties, corrosion behavior, cytocompatibility and magnetic resonance imaging （MRI） compatibility of Zr-2.5X （X = Nb, Sn） alloys for biomedical application are comparatively investigated. It is found that Zr-2.5Nb alloy has a duplex structure of ~ and ~ phase and Zr-2.5Sn alloy is composed of α phase. Both separate addition of Nb and Sn can strengthen Zr but Nb is more effective in strengthening Zr than Sn. The studied Zr-2.5X （X = Nb, Sn） alloys show improved corrosion resistance compared to pure Zr as indicted by the decreased corrosion current density. The alloying addition of Nb enhances the pitting resistance of Zr, whereas the addition of Sn decreases the pitting resistance of Zr. The extracts of Zr-2.5X alloys produce no significant deleterious effect on fibroblast cells （L-929） and osteoblast-Iike cells （MG 63）, indicating good in vitro cytocompatibility. The Zr-2.5X （X = Nb, Sn） alloys show decreased magnetic susceptibility compared to pure Zr and their magnetic susceptibility is far lower than that of pure Ti and Ti-6AI-4V alloy. Based on these facts, Zr-2.5Nb alloy is more suitable for implant material than Zr-2.5Sn alloy. Sn is not suitable as individual alloying addition for Zr because Sn addition decreases the pitting resistance in physiological solution.

关键词： Zr alloys Mechanical properties Corrosion resistance Cytocompatibility Magnetic susceptibility

Self Healing Asphalt Concrete-state of the Art

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武汉理工大学学报 2010年第17期32卷 67-70,88页

作者： jIANG H WU S P qiu j WEI W Key Laboratory of Silicate Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Delft University of Technology P.O. Box 50482600 GA Delftthe Netherlands

Similar to engineering materials used in civil engineering,aerospace engineering and other applications,an asphalt concrete also suffers from fatigue cracking due to a cyclic loading conditions on the road,which results in a decrease of the stiffness and the strength. The self healing capability has been investigated widely due to its unique contribution to the recovery of the stiffness and the strength from cracking and then to extend the service life of asphalt pavements. In this paper,general concepts of self healing and self healing asphalt concrete were introduced. Then,the parameters that influence the self healing capability of the asphalt binder and asphalt concrete were discussed. Inspired from other self healing materials,the possibilities of applying microcapsule self healing system in asphalt concrete were investigated in detail.

关键词： self-healing asphalt asphalt concrete microcapsules

Surface Characterization and Cell Response of Binary Ti-Ag Alloys with CP Ti as Material Control

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journal of Materials Science & Technology 2012年第9期28卷 779-784页

作者： B.B. Zhang K.j. qiu B.L. Wang L. Li Y.F. Zheng Center for Biomedical Materials and Engineering Harbin Engineering University Harbin 150001 China Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China

In this study, the surface passive films, dissolution behavior and biocompatibility of Ti-Ag alloys （with 5%, 10% and 20% Ag） were evaluated by X-ray diffraction （XRD） tests, electrochemical corrosion tests, X-ray photoelectron spectroscopy （XPS） tests, dissolution tests and in-vitro cytotoxicity tests. The surface films on the Ti-20Ag alloy are rich in Ti and much deficient in Ag with respect to alloy composition, as identified by XPS. Compared to CP Ti, Ti-SAg and Ti-20Ag alloys show larger impedances and lower capacitances, which can be associated with an increase of the passive layer thickness. Moreover, all Ti-Ag alloys exhibit negligible or low metal release in the test solutions. The in-vitro cytotoxicity results show Ti-Ag alloys seem to be as cytocompatible as CP Ti. From the viewpoint of surface passive film and cytotoxicity, Ti-SAg and Ti-20Ag are considered to be more suitable for dental applications.

关键词： Ti-Ag alloy Surfaces Electrochemical corrosion Cytotoxicity

ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY STUDY OF CORROSION INHIBITION OF MODIFIED LIGNOSULPHONATE FOR CARBON STEEL

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Acta Metallurgica Sinica(English Letters) 2005年第4期18卷 519-524页

作者： C.H. Yi X. Q. qiu D.j. Yang H.M. Lou College of Chemical and Energy Engineering South China University of TechnologyGuangzhou 510640 China

The corrosion inhibition for carbon steel in circulating cooling water by modified lignosulphonate has been investigated using electrochemical impedance spectroscopy technique. Results show that the inhibition efficiency of modified lignosulphonate GCL2 is a great improvement on that of lignosulphonate. The maximum inhibition efficiency of GCL2 reaches 99.21% at the concentration of 400mg·L^-1 at 303K. The corrosion inhibition of GCL2 is attributed to forming adsorption film on the metal surface for the electrochemical impedance spectroscopy in GCL2 solution shows more than one ***,results also indicate that it is more efficient in stirring solution than in still solution for GCL2 because the constant of adsorption in stirring solution is much larger than that in still solution. The adsorption of inhibitor GCL2 follows Langmuir＇s adsorption isotherm.

关键词： electrochemical impedance spectroscopy EIS corrosion inhibition modified lignosulphonate

Durable Asphalt Pavements Are Self Healing

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武汉理工大学学报 2010年第17期32卷 30-34页

作者： qiu j VAN DE VEN M F C WU S P YU j Y MOLENAAR A A A Delft University of Technology P.O. Box 50482600 GA Delftthe Netherlands Key Laboratory of Silicate Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

The traffic volume and the number of heavy vehicles are growing continuously. Considering the continuous traffic flow and the limited time available for road maintenance,it is very important to design a durable pavement system. Asphalt pavements with a healing capability are believed to be very useful since they can extend the pavement service life thanks to rest periods and hot summers. In order to design durable asphalt pavements,research in understanding and upgrading the self-healing capability of bituminous materials in time is of major importance. The self healing capability of bituminous mastic was evaluated in this research with a direct tension healing test. In the test program,different healing times,crack status and modifications were applied. The results indicate that elastic recovery and flow capacity are important factors for the self healing capability of bituminous materials at different crack phases as simulated with the direct tension test.

关键词： durability self healing cracking bituminous mastic elastic recovery flow

Stability of the Oil-water Emulsion Formed During Amphiphilic Polymer Flooding

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Stability of the Oil-water Emulsion Formed During Amphiphili...

中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： j.qiu Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of Sciences

The amphiphilic polymer can greatly improve the stability of produced liquid and thus makes it difficult to *** is of great necessity to study the stability of amphiphilic polymer flooding O/W crude oil emulsion.O/W crude oil emulsion tends to be more stable with increasing amphiphilic polymer concentration and decreasing holding *** polymer flooding O/W crude oil emulsion is much more stable,especially when polymer concentration is above critical aggregation *** formed by hydrophobic groups of the amphiphilic polymer is beneficial to the stability of amphiphilic polymer flooding O/W crude oil emulsions.

关键词： aggregation amphiphilic polymer CAC O/W emulsion stability

Review and Introduction

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Review and Introduction

CCAST“微扰QCD理论进展及应用”研讨会

作者： j.qiu

＜正＞ *** Inelastic Scattering and Parton *** in QCD

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Single Transverse Spin Asymmetry

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Single Transverse Spin Asymmetry

CCAST“微扰QCD理论进展及应用”研讨会

作者： j.qiu ISU/BNL

＜正＞ *** of Single Spin *** *** data on such *** Model Predictions

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PQCD Resummation

PQCD Resummation

CCAST“微扰QCD理论进展及应用”研讨会

作者： j.qiu ISU/BNL

＜正＞ *** is PQCD Resummation?*** *** Resummation for T-1

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