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Fabrication of titanium/Fluorapatite Composites and In Vitro Behavior in Simulated Body Fluid

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Journal of Materials Science & Technology 2013年第6期29卷 523-532页

作者： Hezhou Ye Xing Yang Liu Hanping Hong Faculty of Engineering University of Western OntarioLondonOntario N6A 5B8Canada Industrial Materials Institute National Research Council of CanadaLondonOntario N6G 4XCanada

titanium/fluorapatite （Ti/FA） composites with various FA additions were fabricated by powder metallurgy. The decomposition of FA during sintering was accelerated by the presence of Ti. The main reaction products of FA and Ti were identified as CaO, Ti phosphides, and CaTiO3. The addition of FA significantly inhibited the densification of Ti. The in vitro bioactivity of the composites was evaluated in a simulated body fluid （SBF）. After immersion into the SBF, all the Ti/FA composites induced nucleation and growth of bone-like carbonated apatite on the surface. Co-precipitation of CaCO3 and Mg（OH）2 was also detected on the surface of the composite with high FA addition at an early stage of immersion. Furthermore, the release of fluorine ions from the composite was confirmed, which could promote bone regeneration and retard the formation of caries in the biological environment. The in vitro behavior was attributed to multiple factors, including the surface conditions and the constituents of the composite. The results demonstrated that the Ti/FA composites were bioactive in nature even with a low FA addition and they could introduce the benefit of fluorine ions in the service.

关键词： titanium Fluorapatite In vitro Bioactivity

titanium Technology in the USA - an Overview

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Journal of Materials Science & Technology 2001年第4期17卷 439-443页

作者： D.Eylon S.R.Seagle GraduateMaterialsEngineering UniversityofDaytonDaytonOhio45469USA Consultant 60HeronCircleCortlandOH44410USA

The state of Ti research, development and industry is reviewed in this article. The fifty-year anniversary of Ti technology commercialization in the USA provides an opportunity for a historical perspective. Incorporation of 'information-age' tools into alloy development, processing, and production invigorates the technology. Consolidation, diversification and globalization have been transforming the Ti industry in the recent years.

关键词： titanium

titanium particles in peri-implantitis:distribution,pathogenesis and prospects

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International Journal of Oral Science 2023年第4期15卷 588-600页

作者： Long Chen Zian Tong Hongke Luo Yuan Qu Xinhua Gu Misi Si Stomatology Hospital School of StomatologyZhejiang University School of MedicineZhejiang Provincial Clinical Research Center for Oral DiseasesKey Laboratory of Oral Biomedical Research of Zhejiang ProvinceCancer Center of Zhejiang UniversityEngineering Research Center of Oral Biomaterials and Devices of Zhejiang ProvinceHangzhouChina Department of Stomatology The First Affiliated HospitalZhejiang University School of MedicineHangzhouChina Zhejiang University-University of Edinburgh Institute International CampusZhejiang UniversityHainingChina

Peri-implantitis is one of the most important biological complications in the field of oral *** the causative factors of peri-implant inflammation and osteolysis is crucial for the disease’s prevention and *** underlying risk factors and detailed pathogenesis of peri-implantitis remain to be ***-based implants as the most widely used implant inevitably release titanium particles into the surrounding ***,the concentration of titanium particles increases significantly at peri-implantitis sites,suggesting titanium particles as a potential risk factor for the *** studies have indicated that titanium particles can induce peripheral osteolysis and foster the development of aseptic osteoarthritis in orthopedic joint ***,it remains unconfirmed whether this phenomenon also triggers inflammation and bone resorption in peri-implant *** review summarizes the distribution of titanium particles around the implant,the potential roles in peri-implantitis and the prevalent prevention strategies,which expects to provide new directions for the study of the pathogenesis and treatment of peri-implantitis.

关键词： titanium titanium distribution

titanium-Containing Mesoporous Materials: Synthesis and Application in Selective Catalytic Oxidation

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Journal of Natural Gas Chemistry 2006年第3期15卷 164-177页

作者： Jie Li Chunhui Zhou Huali Xie Zhonghua Ge Liangcai Yuan Xiaonian Li College of Chemical Engineering and Materials Science Zhejiang University of Technology Hangzhou 310014 Zhejiang China

titanium-containing mesoporous molecular sieves are of great significance in selective catalytic oxidation processes with bulky molecules. Recent researches and developments on the designing and synthesis of Ti-containing mesoporous materials have been reviewed. Various strategies for the preparation of Ti-containing mesoporous materials, such as direct synthesis and post-synthesis, are described. Modifications of Ti-containing mesoporous materials by surface-grafting and atom-planting are also discussed. All approaches aimed mainly at the improving of the stability, the hydrophobicity, and mostly the catalytic activity. Structural and mechanistic features of various synthetic systems are discussed. Ticontaining mesoporous materials in liquid phase catalytic oxidation of organic compounds with H2O2 as an oxidant is briefly summarized, showing their broad utilities for green synthesis of fine chemicals by catalytic oxidative reactions.

关键词： mesoporous materials titanium molecular sieve zeolites characterization catalytic oxidation

titanium, Ti, A New Mineral Species from Luobusha, Tibet, China

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Acta Geologica Sinica(English Edition) 2013年第5期87卷 1275-1280页

作者： FANG Qingsong BAI Wenji YANG Jingsu RONG He SHI Nicheng LI Guowu XIONG Ming MA Zhesheng Institute of Geology CAGS X-ray Diffraction Laboratory China University of Geosciences

We describe the new mineral species titanium, ideally Ti, found in the podiform chromitites of the Luobusha ophiolite in Tibet, People＇s Republic of China. The irregular crystals range from 0.1 to 0.6 mm in diameter and form an intergrowth with coesite and kyanite. titanium is silver grey in colour, the luster is metallic, it is opaque, the streak is grayish black, and it is non-fluorescent. The mineral is malleable, has a rough to hackly fracture and has no apparent cleavage. The estimated Mohs hardness is 4, and the calculated density is 4.503 g/cm3. The composition is Ti 99.23-100.00 wt%. The mineral is hexagonal, space group P6flmmc. Unit-cell parameters are a 2.950 （2） ~, c 4.686 （1） A,V 35.32 （5） A3, Z = 2. The five strongest powder diffraction lines [d in A （hkl）（I/I0）] are： 2.569 （010）（32）, 2.254（011）（100）, 1.730 （012）（16）, 1.478 （110）（21）, and 0.9464 （121）（8）. The species and name were approved by the CNMNC （IMA 2010-044）.

关键词： titanium new mineral species Ti chromitite Luobusha ophiolite Tibet

titanium mesh for bone augmentation in oral implantology: current application and progress

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International Journal of Oral Science 2020年第4期12卷 275-286页

作者： Yu Xie Songhang Li Tianxu Zhang Chao Wang Xiaoxiao Cai State Key Laboratory of Oral Diseases&National Clinical Research Center for Oral Diseases&Dept.of Head and Department of Implant Dentistry West China Hospital of StomatologySichuan UniversityChengduChina College of Stomatology Chongqing Medical UniversityChongqingChina Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijingChina

Guided bone regeneration(GBR)is an effective and simple method for bone augmentation,which is often used to reconstruct the alveolar ridge when the bone defect occurs in the implant *** mesh has expanded the indications of GBR technology due to its excellent mechanical properties and biocompatibility,so that the GBR technology can be used to repair alveolar ridges with larger bone defects,and can obtain excellent and stable bone augmentation ***,GBR with titanium mesh has various clinical applications,including different clinical *** graft materials,titanium mesh covering methods,and titanium mesh fixing methods are also ***,the research of GBR with titanium mesh has led to multifarious progresses in digitalization and material *** article reviews the properties of titanium mesh and the difference of titanium mesh with other barrier membranes;the current clinical application of titanium mesh in bone augmentation;common complications and management and prevention methods in the application of titanium mesh;and research progress of titanium mesh in digitization and material *** to provide a reference for further improvement of titanium mesh in clinical application and related research of titanium mesh.

关键词： titanium titanium mesh

titanium Complexes Bearing NNO-Tridentate Ligands: Highly Active Olefin Polymerization Catalysts with Great Control on Molecular Weight and Distribution

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Chinese Journal of Chemistry 2022年第23期40卷 2785-2793,I0002页

作者： Jiliang Tian Wenzheng Feng Shaofeng Liu Zhibo Li Key Laboratory of Biobased Polymer Materials College of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdaoShandong 266042China College of Chemical Engineering Qingdao University of Science and TechnologyQingdaoShandong 266042China

A series of titanium amido complexes (1-Ti(NMe_(2))_(2) to 4-Ti(NMe_(2))_(2)) bearing NNO-tridentate ligands was synthesized from the reactions of phenoxy-imine-amine ligands with one equivalent of Ti(NMe_(2))_(4). Subsequently, titanium dichloride complexes (1-TiCl_(2) to 4-TiCl_(2)) were prepared by treatment of titanium amido complexes with excess Me3SiCl in toluene. All metal complexes were characterized by 1H and 13C NMR spectroscopy, and the molecular structures of complexes of 2-Ti(NMe_(2))_(2), 2-TiCl_(2), and 4-TiCl_(2) in the solid state were determined by single-crystal X-ray diffraction. Upon activation with MAO, titanium dichloride complexes as single-site catalysts were extremely active toward ethylene homopolymerization with great control on molecular weight and distribution. In particular, 3-TiCl_(2)/MAO exhibited an activity as high as 1.35 × 108 g(PE)·mol−1(Ti)·h−1 at 70°C and produced polyethylene with high molecular weight (41.7 × 10^(4) g∙mol^(−1)) and very narrow distribution (Đ = 1.23). In the presence of 1-octene as comonomer, linear low-density polyethylenes (LLDPEs) with ultrahigh molecular weights (Mw = 136—326 × 10^(4) g∙mol^(−1)) and narrow distributions (Đ = 1.20—1.50) were successfully synthesized.

关键词： titanium Homogeneous catalysis Polymerization UHMWPE LLDPE

titanium dioxide as an adsorbent to enhance the detection ability of near-infrared diffuse reflectance spectroscopy

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Chinese Chemical Letters 2019年第5期30卷 1024-1026页

作者： Shuyu Wang Jin Zhang Wensheng Cai Xueguang Shao Research Center for Analytical Sciences College of ChemistryNankai UniversityTianjin 300071China Tianjin Key Laboratory of Biosensing and Molecular Recognition Tianjin 300071China State Key Laboratory of Medicinal Chemical Biology Tianjin 300071China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300071China

A method for quantitative determination of fish sperm deoxyribonucleic acid(fsDNA)was developed by using titanium dioxide(TiO2)as an adsorbent and near-infrared diffuse reflectance spectroscopy(NIRDRS).The selective enrichment of fsDNA was proved by comparing the adsorption efficiency of bovine serum albumin,tyrosine and tryptophan,and the low adsorption background of TiO2 was illustrated by comparing the spectra of four commonly-used inorganic adsorbents(alkaline aluminium oxide,neutral aluminium oxide,nano-hydroxyapatite and silica).The spectral feature of fsDNA can be clearly observed in the spectrum of the *** least squares(PLS)model was built for quantitative determination of fsDNA using 28 solutions,and 13 solutions with interferences were used for validation of the *** results showed that the correlation coefficient(R)between the predicted and the reference concentration is 0.9727 and the recoveries of the validation samples are in the range of 98.2%-100.7%.

关键词： Near-infrared diffuse reflectance spectroscopy Quantitative model Detection ability titanium dioxide Fish sperm DNA

Microstructures of brazing zone between titanium alloy and stainless steel using various filler metals

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中国有色金属学会会刊：英文版 2012年第S3期22卷 639-644页

作者： Taeshin CHUNG Jungsoo KIM Jeongseok BANG Byoungho RHEE Daegeun NAM Agency for Defense Development Korea Institute of Industrial Technology Vitzotech Corporation

titanium alloy (Ti-Al-V alloy) substrate was brazed with stainless steel (STS304) using filler *** an optimized brazing condition,various filler metals were *** were observed at each *** metals were titanium based 40Ti-20Zr-20Cu-20Ni,silver based Ag 5Pd,and nickel based Ni-7Cr-3.1B-4.5Si-3Fe-0.06C (BNi2) and Ni-14Cr-10P-0.06C (BNi7).To select a good filler metal for brazing process,wetting test was performed at 880-1050 °*** was not brazed using silver based filler metals,but at the conditions using titanium and nickel based filler metals had brazed zone between titanium alloy and stainless ***,titanium alloy was eroded during brazing using titanium based filler *** based filler metal has a good brazed zone between titanium alloy and stainless steel among the filler metals.

关键词： brazing filler metal titanium alloy stainless steel