MATERIALS CHARACTERIZATION
·
2021
·
IF 4.342
Wennan Su,Xiufang Cui,Guo Jin,Yajie Guan,Yao Zhao,Simin Wan,Changhao Liu,Yuyun Yang,Haoliang Tian
NiTi, NiTi-4Si, and NiTi-4Si-2YF 3 coatings were prepared on Ti-6Al-4V substrate by laser cladding to obtain composite multilayer protective coating for composite structure. The effects of Si and YF 3 addition on the microstructure, phase composition, microhardness , and phase transformation of the coatings were systematically analyzed. The coatings are mainly composed of NiTi, NiTi 2, and TiN phases. The addition of YF 3 results in the decrease of the dendrite TiN phase in the coating. TEM results show that the core-shell structure is observed in NiTi-4Si coating. The β -Ti phase was surrounded by the shell NiTi 2 phase. After the addition of YF 3 , the core-shell structure was found to disappear. With the addition of the Si element, the eutectic structure was found in the coatings. The eutectic structure is mainly composed of NiTi (B2) and Ti 2 Si phases. According to the SEAD result, there are crystallographic orientation relationships (ORs) between NiTi (B2) phase and Ti 2 Si phase as follows: 1 ¯ 11 B 2 / / 1 ¯ 23 Ti 2 Si . The average microhardness of the NiTi, NiTi-4Si and NiTi-4Si-2YF 3 coatings were at 468.33 HV 0.5 , 499.86 HV 0.5 , and 433.65 HV 0.5 , respectively. At the same time, the uniformity of the NiTi phase in NiTi-4Si-2YF 3 coatings is improved, which is conducive to a more complete phase transition.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2014
·Vol. 5
·期 2
·1231-1240
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IF 4.76
Y. N. Liu,J. T. Feng,Y. F. He,J. H. Sun,D. Q. Li
NiTi-layered double hydroxide (NiTi-LDH) with rich defective sites was synthesized and used as the support for the preparation of a novel supported PdAg nanoalloy catalyst for the partial hydrogenation of acetylene. The obtained PdAg/NiTi-LDH catalyst exhibited a remarkable catalytic performance. When the conversion of acetylene reached 90%, the selectivity towards ethene maintained 82%. Superior hydrogenation activity was ascribed to two key factors. Small particle size and high dispersion of PdAg nanoparticles were responsible for boosting the catalytic activity. In addition, Ti3+ defective sites in the support also played an important role in the enhancement of activity. The interface at the Ti3+ species and active metals acting as new active sites enhanced the activation and dissociation of hydrogen and therefore further improved the catalytic activity. Preferable selectivity was assigned to the electronic effect between the NiTi-LDH support and the PdAg nanoalloys. The electron transfer from the Ti3+ species to the Pd resulted in the increase of electron density and the linearly coordinated sites of Pd and therefore facilitated the desorption of ethene. Moreover, due to the reducibility of NiTi-LDH, the selectivity and stability over the reduced PdAg/NiTi-LDH catalyst were further enhanced on account of the strong metal–support interaction.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 20
·7331
·
IF 3.748
Zhiqiang He,Ze Wang,Dezhi Wang,Xinli Liu,Bohua Duan
Porous NiTi alloys were manufactured by integration of gel-casting and microwave sintering. The effects of sintering temperature on porosity, compressive strength, pore morphology and phase composition of sintered samples were researched. The results show that the porosity and the mean pore diameter of porous NiTi alloys decrease with increasing sintering temperature, whereas the content of the NiTi phase, the elastic modulus and compressive strength of sintered samples increase. When the gel body with the solid loading of 50 vol.% is microwave sintered at 1000 °C for 30 min, porous NiTi alloys are obtained with the porosity of 38.9%, the compressive strength of 254 MPa, elastic modulus of 4 GPa, and predominant phase of NiTi. The results suggest that the method is suitable for rapid preparation of large-size and complex-shape personalized products similar to human bones at a low cost.Keywords:gel-casting;porous NiTi alloy;microwave sintering;microstructure;mechanical properties
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 20
·15639-15650
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IF 4.6
Zicheng Wan,Dongyang Li,Yang Zhou,Tun Wang,Benyin Zhu,Changhai Du,Yimin Li,Chang Shu
This study presents a preliminary investigation of porous nickel-titanium (NiTi) materials with controllable porosity fabricated through metal injection molding combined with the powder space-holder method (MIM-PSH). The thermosensitive hydrogel Pluronic F-127 was utilized as a drug carrier to load the anti-proliferative drug rapamycin, resulting in porous NiTi-hydrogel composite materials for controlled drug release. By tuning the NiTi matrix porosity (0%, 20%, and 40%), the system achieved precise modulation of drug loading capacity and release kinetics. Notably, the 40% porous NiTi composite exhibited a threefold increase in the drug-loading capacity and sustained release over 17 days. This hybrid design leveraged the thermoresponsive properties of the hydrogel and the tailored pore architecture to enable spatiotemporal control of rapamycin delivery, effectively inhibiting human aortic smooth muscle cell proliferation and mitigating in vivo vascular tissue hyperplasia. This study provides a foundational framework for the development of multifunctional biomaterial systems for vascular therapy.
研究领域:
生物医学工程
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材料科学
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药理学
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产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Lianbo Wang,Shilong Xing,Huabing Liu,Chuanhai Jiang,Vincent Ji
In the present work, CeO 2 nanoparticles were extra added into Ni Ti nanocomposite coating to optimize the spatial microstructures and wear properties. Before adding CeO 2 nanoparticles into Ni Ti nanocomposite coating, Ti microparticles distributed in forms of cluster in Ni deposits, leading to the spatial inhomogeneity of microstructures like local large grains and residual [200] fiber textures. Correspondingly, the hardness in small-grain regions was up to ~4456 ± 46 MPa, while the hardness in large-grain areas dropped to values as low as ~3493 ± 40 MPa. Besides that, inside pores and jagged surface were observable, confining the wear resistance capacity. The average hardness was ~3814 ± 279 MPa. After extra adding CeO 2 nanoparticles into Ni Ti nanocomposite coating, Ti microparticles homogeneously scattered throughout the whole nanocomposite coating, leading to the spatial homogeneity of microstructures and properties. Grain size steadily kept at ~40 nm and the hardness stabilized at ~4326 ± 150 MPa. Inside pores vanished, the surface became smooth, and residual [2 0 0] texture was fractured. Benefiting from the modified spatial microstructures and improved hardness, enhanced wear resistance was achieved.
研究领域:
材料科学
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表面工程
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纳米技术
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Shuangjun Xi,Yijie Qiao,Lan Jiang,Jie Hu,Jie Yang,Weina Han
Bone defects caused by trauma or severe diseases present significant clinical challenges. In this study, a multifunctional, multiscale therapeutic platform based on NiTi alloy was developed, exhibiting enhanced osteointegration and antibacterial performance. Femtosecond laser direct writing was first used to create micro-grooves with periodic ripple structures, promoting osteointegration via contact guidance effects. Subsequent anodizing generated a nanostructured porous layer on this microstructure, further enhancing biocompatibility and osteointegration. Finally, a polydopamine coating was applied to facilitate the in-situ incorporation of nanosilver, imparting strong antibacterial properties while simultaneously enhancing cell adhesion. MC3T3-E1 cell adhesion and differentiation assays confirmed the platform’s robust osteogenic capacity. Additionally, the system achieved bactericidal efficiencies of 99.86 % against E. coli and 99.69 % against S. aureus . Overall, this study presents a comprehensive and effective method with high potential for bone defect repair.
研究领域:
生物材料学
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骨科学
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表面工程
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组织工程
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纳米医学
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转化医学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Fengming Hou,Zekai Sheng,Zhipeng Guo,Leilei Zou,Yihang Li,Libang Ai,Jin Li,Xiaoke Zhang,Wei Wei,Ang Wei
Eliminating dormant spores of Aspergillus fumigatus ( A. fumigatus ) with robust cell wall and super hydrophobicity is a formidable challenge and has attracted great attention. Herein, we found that NiTi-layered double hydroxide (NiTi-LDH) exhibited remarkable photocatalytic inactivation against A. fumigatus dormant spores (∼10 4 CFU/mL), the killing rate could reach to 91.6% after 6 h visible light irradiation , which was reusable. Zeta potential test showed that NiTi-LDH possessed positively charged while spores presented negatively charged, which promoted their interaction through electrostatic adsorption, and this was also confirmed by SEM. It not only overcame the problems of low affinity caused by hydrophobicity, and short action distance of photo-generated active species because of their extremely short lifetime, but also weakened spore via interfering with its normal metabolism. In addition, NiTi-LDH exhibited wonderful visible light absorption and excellent photogenerated carrier's separation. Therefore, under the synergy of positive charge disruption and active species oxidation , the dormant spores were severely damaged and died. This work might provide enlightenment for selection and design of recyclable photocatalyst to efficiently and greenly remove pathogenic microorganisms under visible light.
研究领域:
微生物学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 23
·8398-8398
·
IF 3.748
Ze Wang,Zhiqiang He,Bohua Duan,Xinli Liu,Dezhi Wang
Porous NiTi alloys are widely applied in the field of medical implant materials due to their excellent properties. In this paper, porous NiTi alloys were prepared by non-aqueous gel-casting. The influence of solid loading on the process characteristics of slurries and the microstructure and mechanical properties of sintered samples were investigated. The viscosity and the stability of slurry significantly increased with the growth of solid loading, and the slurry had better process characteristics in the solid loading range of 40-52 vol.%. Meanwhile, the porosity and average pore diameter of the sintered NiTi alloys decreased with a rise in the solid loading, while the compressive strength increased. Porous NiTi alloys with porosities of 43.3-48.6%, average pore sizes of 53-145 µm, and compressive strengths of 87-167 MPa were fabricated by gel-casting. These properties meet the requirements of cortical bone. The results suggest that the pore structure and mechanical properties of porous NiTi products produced by gel-casting can be adjusted by controlling the solid loading.
研究领域:
材料科学
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生物医学工程
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机械工程
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xinfei Zhang,Panpan Lin,Jincheng Lin,Xinyue Li,Shuye Zhang,Fugang Lu,Zihan Cong,Ce Wang,Peng He,Tiesong Lin
A novel transient liquid phase bonding (TLP) method for obtaining high-temperature resistant diamond/Cu joint was designed. The joint was achieved through the isothermal solidification of Au–Si interlayer assisted by the diamond active modified layer and NiTi particles. The interfacial reaction mechanisms in the TLP process were systematically investigated in this study. The results shown that Ti 5 Si 3 C, CuTiSi and NiTiSi precipitated from the seam. Due to the precipitation of Si and the interdiffusion of Au–Cu, a ductile Au–Cu solid solution ((Au, Cu)ss) matrix formed. The shear strength of the diamond/Cu joint was notably affected by the holding time. The maximum room-temperature shear strength of 108 MPa was achieved when the joints were held at 600 °C for 60 min, and the high-temperature strength was still up to 22 MPa at 600 °C. The high strength of the joints was achieved because of (i) the elimination of the Cu(Au)–Si brittle phases, (ii) the NiTiSi whiskers pulling-out mechanism, and (iii) the moderate distribution of compounds at the diamond/seam interface.
研究领域:
材料科学
·
焊接工程
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Mengxia Peng,Quanchao Zhang,Mengna Zhang,Zhiwei Yang,Yizao Wan,Xiaoyan Deng,Honglin Luo
Improved bone bonding ability and antibacterial activity are two critical requirements for implants. In this work, novel dual surface modifications of dealloying and polydopamine/silver coating on a NiTi alloy were conducted. Scanning electron microscopy (SEM) results show a porous layer with interconnected micro- and nano-pores on the dealloyed NiTi alloy. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) results confirm the formation of a polydopamine/silver coating on the surface of the dealloyed NiTi alloy. The silver nanoparticles (58.9 nm, in the polydopamine/silver coating) on the dealloyed NiTi alloy surface are smaller when compared with pristine NiTi alloy (73.1 nm). Moreover, the dealloyed NiTi alloy with polydopamine/silver coating exhibits better antibacterial activity against Escherichia coli (99.7%) and Staphylococcus aureus (99.4%) than pristine NiTi alloy with the same coating (97.3% and 96.5%, respectively), due to the larger surface area, higher silver content, and smaller silver nanoparticles that trigger more silver ion release. The combined dealloying and coating method is an effective way of increasing antibacterial activity of NiTi alloys. The findings presented in this work may provide a new guidance for the surface modification of NiTi implant materials .
研究领域:
材料科学
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生物材料
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表面工程
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生物医学工程
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Huafan Li,Weijia Han,Tianli Zhu,Ligong Chen,Luis Ricardez-Sandoval,Guoyi Bai
In this work, a NiTi-MMO/TiO 2 -R catalyst was prepared by in-situ generation of a TiO 2 support during hydrothermal synthesis of the hydrotalcite precursor for NiTi-MMO. The formation of NiTi-MMO can reduce the size of metallic Ni particles, which can significantly improve the catalyst's activity, and the in-situ generated TiO 2 support can enhance the dispersion of NiTi-MMO and the utilization efficiency of the active nickel species. The NiTi-MMO/TiO 2 -R catalyst showed high activity for the hydrogenation of dioctyl phthalate to dioctyl-1,2-cyclohexanedicarboxylate. The catalyst also exhibited good stability, maintaining the yield over 90 % after 6 cycles. Characterization results showed that a strong metal-support interaction was formed between the in-situ generated TiO 2 support and the metallic Ni particles produced by the reduction of NiTi-MMO. The strong metal-support interactions formed between metallic Ni particles and the in-situ generated TiO 2 played a crucial role in stabilizing the nickel species and preventing their aggregation, resulting in superior catalytic performance.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Xue Ma,Hao Wang,Hongwei Xie,Jiakang Qu,Xiang Chen,Fei Chen,Qiushi Song,Huayi Yin
An Electro-Assisted Powder Metallurgical (EPM) route is able to prepare porous NiTi alloys with controllable porosities and pore sizes using nickel (Ni) and titanium (Ti) powders at a temperature ranging from 850 to 950 °C. Ammonium hydrogen carbonate (NH 4 HCO 3 ) was used as a sacrificial space holder to tailor the porosity and pore size of the NiTi alloy and its properties, i.e., elastic modulus , phase transformation temperature, shape memory effect, and superelasticity . By optimizing the synthesis temperature and content of the sacrificial space holder (0–30%), the porosity (41–75%), pore size (22–174 μm ), elastic modulus (4.77–0.87 GPa) and the recovery strain (>2%) of the EPM-NiTi can meet or are close to the standard of natural bone (porosity: 30%–80%, pore size: 100–600 μm, cancellous modulus: < 3 GPa, recovery strain: > 2%). Therefore, the EPM route is promising to prepare porous Ti-based alloys for implants.
研究领域:
材料科学
·
冶金学
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生物材料
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生物医学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）