CERAMICS INTERNATIONAL
·
2021
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IF 4.527
Lingling Cui,Hang Li,Jiewen Huang,Dangsheng Xiong
To improve the biotribological properties of Ti6Al4V alloy for artificial joints, motivated by the composite structure of ‘natural articular cartilage - subchondral bone’ and the hydration lubrication mechanism of articular cartilage, a soft/hard bilayer coating composed of a porous TiO 2 layer and a zwitterionic hydrogel coating was designed and fabricated on Ti6Al4V alloy through micro-arc oxidation (MAO) combined with ultraviolet (UV) radiation technology. Characterization results revealed that the bio-inspired bilayer coating could be successfully constructed on Ti6Al4V alloy, and such a coating displayed good hydrophilicity (WCA: 32°). Notably, by ball - on - disk friction test, this biomimetic bilayer coating exhibited an ultra-low friction coefficient (∼0.038) in PBS solution, which was reduced by an order of magnitude compared with that of the Ti6Al4V alloy substrate. This was due to the synergistic effects of soft/hard composite structure and the hydration lubrication of zwitterionic MPC polymer. This work provides a novel and effective strategy for surface modification of Ti6Al4V alloy for artificial joints.
研究领域:
生物材料
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表面工程
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摩擦学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zhengwei Xu,Xiaohong Jiang
The purpose of the nano-porous TiO 2 modification on TC26 (Ti-13 Nb-13Zr) alloy is to settle the issue that the surface inertness of titanium alloys restricts bioactivity and osseointegration of artificial implants . Secondary constant current anodization was conducted to realize the efficient fabrication of the TiO 2 composite nano-porous arrays containing the terminal small-diameter nanopores and the upper large-diameter nanotubes . The oxygen bubble mould theory has revealed the anodization mechanism of the TiO 2 nano-porous arrays. The anodization parameters and heat treatment conditions are both able to elicit influence on morphology, chemical composition , surface properties and biocompatibility of the as-fabricated samples. The interaction of MC3TC-E1 mouse pre-osteoblasts with a series of TiO 2 nano-porous arrays fabricated by primary anodization (PA) and secondary anodization (SA) was investigated by the MTT assay and alkaline phosphatase (ALP) activity assay. The response of the seeded MC3TC-E1 pre-osteoblasts to the as-fabricated samples with various nano-scale dimensions has indicated that appropriate nano-porous morphologies and heat treatment conditions have the capacity to augment cell adhesion, growth, differentiation and functionality. Such fabrication route in this research has provided a promising prospect for development of artificial implants.
研究领域:
材料科学
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生物材料
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生物医学工程
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细胞生物学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
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2019
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IF 4.309
Guanyun Zhang,Chenxiao Chu,Jian Yang,Chen-Ho Tung,Yifeng Wang
By aerobic calcination of a new titanium-oxide cluster (TOC) isolated from water, that is, [Ti6O8(OH2)20]·(2,7-NDS)4·2HCl·14H2O (Ti6-NDS; 2,7-NDS = 2,7-naphthalenedisulfonate), porous anatase TiO2 was facially prepared. The sample obtained at 400 °C exhibited a surface area of 108 cm3 g–1 and an average pore diameter of 16 nm. When used as an anode material for a sodium-ion battery (SIB), it showed larger specific capacity and far superior rate performance than the other TiO2 samples, including those prepared from another three TOCs under the same conditions or from Ti6-NDS under different conditions and the one obtained from a commercial source. The mechanistic study indicates that the hierarchical structure surrounding the Ti-oxide cores of Ti6-NDS is pivotal for the formation and the SIB performance of the porous TiO2. This surfactant-free and catalyst-free strategy for the fabrication of TiO2 materials with special morphologies by thermal transformation of a TOC provides a new optional protocol for the preparation of promising materials stable and efficient in SIBs.
研究领域:
材料科学
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能源存储
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纳米技术
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化学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2018
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IF 11.384
Guoxue Liu,Wei Li,Ran Bi,Christian Atangana Etogo,Xin-Yao Yu,Lei Zhang
Despite the ultrahigh energy density of rechargeable lithium–oxygen (Li-O2) batteries, their practical use is still hindered by the poor performance of electrocatalysts. Recently, porous and hollow nanostructured catalysts have been found to be promising electrocatalysts toward the ORR/OER to improve the performance of Li-O2 batteries. However, the catalytic activities of the catalysts are still insufficient and the nanopores are easily clogged by the insoluble discharge products. Herein, highly porous and hollow TiO2–x nanoboxes (TiO2–x NBs) with large surface areas, increased oxygen vacancies, and high grain boundary density have been developed as an electrocatalyst for Li-O2 batteries via a cation-assisted synthetic approach. The Li-O2 batteries with TiO2–x NBs as the electrocatalyst exhibit a high specific capacity of 8569 mA h g–1, excellent rate capability, and long cycle life up to 200 cycles when the capacity is limited to 1000 mA h g–1. Moreover, this cation-assisted approach for fine-tuning the nanostructure could be an innovative strategy to design efficient electrocatalysts for high-performance Li-O2 batteries.
研究领域:
材料科学
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电化学
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纳米技术
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 12
·5909-5918
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IF 6.7
Wenjie Wu,Saiyu Bu,Liang Bai,Yuanting Su,Yenan Song,Haitao Sun,Guangyin Zhen,Ke Dong,Lunhua Deng,Qinghong Yuan,Chengbin Jing,Zhuo Sun
Non-thermal plasma (NTP) degradation of volatile organic compounds (VOCs) into CO2 and H2O is a promising strategy for addressing ever-growing environment pollution. However, its practical implementation is hindered by low conversion efficiency and emissions of noxious by-products. Herein, an advanced low-oxygen-pressure calcination process is developed to fine-tune the oxygen vacancy concentration of MOF-derived TiO2 nanocrystals. Vo-poor and Vo-rich TiO2 catalysts were placed in the back of an NTP reactor to convert harmful ozone molecules into ROS that decompose VOCs via heterogeneous catalytic ozonation processes. The results indicate that Vo-TiO2-5/NTP with the highest Vo concentration exhibited superior catalytic activity in the degradation of toluene compared to NTP-only and TiO2/NTP, achieving a maximum 96% elimination efficiency and 76% COx selectivity at an SIE of 540 J L−1. Mechanistic analysis reveals that the 1O2, ˙O2− and ˙OH species derived from the activation of O3 molecules on Vo sites contribute to the decomposition of toluene over the Vo-rich TiO2 surface. With the aid of advanced characterization and density functional theory calculations, the roles of oxygen vacancies in manipulating the synergistic capability of post-NTP systems were explored, and were attributed to increased O3 adsorption ability and enhanced charge transfer dynamics. This work presents novel insights into the design of high-efficiency NTP catalysts structured with active Vo sites.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）