Frontiers in Bioengineering and Biotechnology
·
2020
·
IF 3.644
Shen Xinkun,Hu Wenjia,Ping Linchao,Liu Chongxing,Yao Lili,Deng Zhennan,Wu Gang
Antibacterial and osteogenic functionalization of titanium (Ti) implants will greatly expand their clinical indications in immediate implant therapy, accelerate osteointegration, and enhance long-term prognosis. We had recently shown that the high-energy shot peening (HESP)-assisted micro-arc oxidation (MAO) significantly improved the bioactivity and coating stability of Ti-based substrates. In this study, we further functionalized Ti with antibacterial and osteogenic properties by doping silicon (Si) and/or copper (Cu) ions into HESP/MAO-treated coatings. Physicochemical characterization displayed that the doping of Si and Cu in HESP/MAO-treated coatings (Si/Cu-MAO) did not significantly change their surface topography, roughness, crystal structure, coating thickness, bonding strength, and wettability. The results of X-ray photoelectron spectroscopy (XPS) showed that Si and Cu in the Si/Cu-MAO coating was in the form of silicate radical (SiO32–) and bivalent copper (Cu2+), respectively. The total amounts of Si and Cu were about 13.5 and 5.8 μg/cm2, which released about 33.2 and 31.3% within 14 day, respectively. Compared with the control group (MAO), Si doping samples (MAO-Si) significantly increased the cell viability, alkaline phosphatase (ALP) activity, mineralization and osteogenic genes (ALP, collagen I and osteocalcin) expression of MC3T3-E1 cells. Furthermore, the addition of Cu presented good bactericidal property against both Staphylococcus aureus and Streptococcus mutans (even under the co-culture condition of bacteria and MC3T3-E1 cells): the bacteriostatic rate of both bacteria was over 95%. In conclusion, the novel bioactive Si/Cu-MAO coating with antibacterial and osteogenic properties is a promising functionalization method for orthopedic and dental implants, especially in the immediate implant treatment with an infected socket.
研究领域:
材料科学
·
生物材料
·
生物医学工程
·
牙科学
·
骨科学
✓ 已验证
DOI
PubMed
高影响因子
WEAR
·
2024
·
IF 5.3
Jiangling Luo,Xiaofan Ma,Xianhang Huang,Yi Cao,Linlin Pan,Xiaodong Zou,Jianglong Yi,Lianyi Shao
The study involved plasma arc transfer welding (PTAW) for preparing coatings of Inconel 625 alloys that contained different amounts of nano-sized hafnium carbide (nano-HfC) particles. The impact of nano-HfC on the microstructure evolution and mechanical properties of PTAWed Inconel 625 were investigated. The research reveals that nano-HfC decomposes during the high-temperature plasma arc process and then react with O element to generate nano-HfO 2 . These HfO 2 can serve as nucleation sites for MC carbides, which restricts the growth of secondary dendrite arms, leading to a more disordered grain growth direction. Simultaneously, the decomposition of HfC can increase the C/Nb ratio of the matrix, effectively suppressing Laves phase formation while encouraging the development of MC carbides. Compared with IN625, the wear rate of composites at room temperature and 600 °C were decreased. Notably, at 600 °C, the wear rate of the coating with 0.5 wt% HfC is the lowest among all the samples, as reflected by a noteworthy reduction in wear rate of 50 %. This is mainly attributed to the refinement of γ matrix, reduction of Laves phase as well as precipitation of the fine-sized MC carbides. This work illustrates that adding nano-HfC is an effective way to improve the wear resistance of the PTAWed Inconel 625.
研究领域:
材料科学
·
焊接工程
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Guangming Xu,Tengfei Liu,Qiao Zou,Gengchen Yang,Shifeng Yan,Changfu Zhang,Ping Liu,Hailin Lu
A composite protective system integrating micro-arc oxidation (MAO) with self-assembled monolayer (SAM) technology was developed to improve the self-cleaning, corrosion, and wear resistance of low-carbon steel in marine environments. The microstructure and elemental distribution of the MAO coating were analyzed using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS), while the bonding mechanisms between Hexadecyltriethoxysilane (HDTES) and the MAO substrate were examined via X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The superhydrophobic coating exhibited a static contact angle of 159.6° and a sliding angle of 7.5°, maintaining a contact angle of 142° after 50 friction cycles. Friction tests revealed a low coefficient of friction and a reduced wear rate. Electrochemical measurements demonstrated a corrosion current density of 1.30 × 10 −8 A/cm 2 and a corrosion rate of 0.00015 mm/y. The composite coating demonstrated excellent superhydrophobicity, mechanical durability, wear resistance, and corrosion resistance, offering an effective solution for metal protection in harsh environments.
研究领域:
材料科学
·
表面工程
·
腐蚀科学
·
纳米技术
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Duchao Zhang,Hongbin Ling,Tianzu Yang,Weifeng Liu,Lin Chen
Electric arc furnace (EAF) dust is a hazardous waste material containing valuable elements, such as zinc (Zn) and iron (Fe), as well as other environmentally harmful elements. In the conventional process, the existence of zinc ferrite (ZnFe 2 O 4 ) in EAF dust results in a low recovery ratio of zinc and can induce high energy consumption or difficulties utilizing iron resources. In this article, a hydrothermal reduction method in a NaOH system is proposed to recover Zn selectively from EAF dust. First, when pure ZnFe 2 O 4 was used as the input material to test the feasibility of the new method, 70% Zn leaching efficiencies and the isolation of Fe in the residue through the formation of ferroferric oxide (Fe 3 O 4 ) were achieved at the optimal conditions of 260 °C, 6 M [NaOH], 10 g/L [C 6 H 12 O 6 ] n and 50 mL/g of L/S. Second, a leaching process of EAF dust was proposed using the following two procedures: (i) first leaching under normal pressure to dissolve zinc oxide (ZnO); and (ii) second leaching of the first leach residue under hydrothermal reduction conditions to dissolve ZnFe 2 O 4 . The leach liquor from the second step was recycled to the first step. Under optimum conditions, the leaching efficiencies of Zn during the first and second leaching were 66.4% and 69.3%, respectively. The total Zn leaching efficiency was calculated to be 89.7%, producing Zn-impregnated leach solution and a leach residue rich in Fe (up to 39.4 wt%) that are suitable as resources for a steel-making plant. However, this process also has its shortcomings owning to larger liquid-solid ratio in the leaching process. Overall, the study technically provides an alternative approach to improve the recycling of zinc and iron and effectively reduce environmental risks from EAF dust.
研究领域:
环境工程
·
冶金工程
·
资源循环利用
·
清洁生产技术
·
工业废物处理
✓ 已验证
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2026
·
IF 6.2
Ke Jing,Bingbing Shang,Meng Zhou,Yi Zhang,Chunhe Chu,Xiaohui Zhang,Xinxin Ma,Baohong Tian,Jin Zou
Electrode materials typically suffer from an inherent trade-off between arc erosion resistance and electrical conductivity. In this work, Cu-10W composites containing of 0, 0.1, 0.3, and 0.5 wt% graphene (Gr) was fabricated via near-net-shape hot isostatic pressing (HIP), and their microstructures and properties were systematically investigated. Among these composites, the Cu-10W-0.1Gr composite exhibited the most balanced performance, achieving a relative density of 98.57%, tensile strength of 317 MPa, elongation of 22.2%, and electrical conductivity of 87.6%IACS. Microstructural analysis revealed that the mechanical and electrical enhancements mainly originated from the dispersion strengthening induced by nano-sized W particles dispersed within the Cu matrix, combined with the optimization of the conductive network by Gr located at grain boundaries. Benefiting from the high electrical conductivity and low work function of Gr, under a 30 V DC and 35 A test condition, the addition of a 0.5wt.%Gr reduced mass loss and erosion rate by up to 24.0%, decreased average arc energy by up to 47.9%, effectively suppressed welding force, and maintained stable contact resistance. This work mitigates the longstanding strength-conductivity dilemma in Cu-based electrode materials, and provides a viable design strategy for high-performance electrical contact composites.
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
·
2026
·
IF 8.7
Enmin Lv,Yilong Wang,Hongtao Yu,Hao Zhang,Xuefeng Zhang,Xinglong Dong
Developing efficient non-precious oxygen reduction reaction (ORR) catalysts is essential for advancing zinc-air batteries (ZABs). This work presents a one-step synthesis of core-shell Cr 3 C 2 @C nanoparticles (NPs) via DC arc-discharge plasma. Precise regulation of cooling dynamics achieves a switch from growth-dominated to nucleation-dominated regimes, enabling controlled preparation of nanoparticles with distinct sizes. The liquid-nitrogen-cooled Cr 3 C 2 @C ln NPs exhibit smaller size and higher surface area, leading to enhanced ORR performance. Subsequent nitrogen doping at 700 °C produces Cr 3 C 2 @C ln (N x ) catalysts with precisely tuned nitrogen content (0.65–1.24 at.%). The optimized Cr 3 C 2 @C ln (N 1.13 ) demonstrates outstanding ORR activity with a half-wave potential ( E 1/2 ) of 0.81 V and superior kinetics, surpassing commercial Pt/C. In situ optical emission spectroscopy (OES) monitors the plasma state and electron temperature, providing fundamental insights into nucleation mechanisms. Density functional theory (DFT) calculations reveal that nitrogen doping optimizes the p -band center of carbon and significantly reduces the energy barrier of the rate-determining step (RDS) (*OH desorption). When applied in both liquid and solid-state flexible zinc-air batteries (FZABs), the Cr 3 C 2 @C ln (N 1.13 )-based cathode delivers exceptional performance, achieving high power densities (230.64 and 164.83 mW·cm −2 , respectively) and remarkable cycling stability. This study offers an efficient strategy for designing high-performance transition metal carbide electrocatalysts through synergistic control of size and electronic structure.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Magnesium and Alloys
·
2026
·
IF 15.8
Chaochao Zhao,Yaxin Xu,Weihan Liu,Tianxiao Tian,Wenya Li
In this study, a duplex coating consisting of an initial cold-sprayed (CS) Al underlayer and a subsequent micro-arc oxidation (MAO) top-layer was developed on a ZM2 cast Mg alloy substrate to enhance its corrosion resistance. The role of the CS Al underlayer in regulating the microstructural evolution, phase transformation, and corrosion behavior was systematically investigated. Surface polishing of the CS (CS(P)) layer reduces roughness and homogenizes the electric field during the following MAO treatment, thereby suppressing localized micro-discharges and promoting the formation of a denser and more uniform ceramic layer. The analyses reveal that the MAO layer consists γ-Al 2 O 3 nanocrystals embedded in an amorphous matrix. This kind of structure effectively minimizes the pore formation and improves the coating integrity of the MAO layer. Electrochemical measurements demonstrate that a significant enhancement in corrosion resistance has been achieved. The corrosion current density decreases by 3 orders of magnitude, while the polarization resistance increases to 2.38 × 10 5 Ω·cm 2 , approximately 280 times higher than that of the bare ZM2 substrate. During 14-day long-term immersion, the CS(P)+MAO duplex coating exhibits exceptional stability, with a negligible cumulative hydrogen evolution (0.65 mL·cm −2 ) and a superior corrosion rate (0.124 mm·y −1 ). Surface characterizations of the CS(P)+MAO duplex coating reveal no evident macroscopic pitting or microcracks. The excellent corrosion resistance of the CS(P)+MAO bilayer coating arises from the synergistic protection provided by a dense microstructure, the physical barrier of the CS Al underlayer, and the chemical stability and high interfacial resistance of the γ-Al 2 O 3 -rich ceramic phase in the MAO top-layer.
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2018
·
IF 2.906
Dan Jiang,Huan Zhou,Shan Wan,Guang-Yi Cai,Ze-Hua Dong
A superhydrophobic composite coating was fabricated on AZ91 magnesium alloy by combining micro-arc oxidation (MAO) and cyclic assembly in phytic acid and Ce(NO 3 ) 3 solution. The influences of assembling cycles on surface morphology and wettability were characterized by scanning electron microscopy and atomic force microscopy . It showed that a micro-nano hierarchical structure was constructed after three cycles of assembly, resulting in a superhydrophobic surface with a contact angle of 159°. Compared with the direct cyclic assembly on bare Mg alloy, the prior MAO treatment could notably reduce the cracks caused by hydrogen evolution during assembling process, and the following assembling process could in return repair the porous defects of MAO layer. Electrochemical tests indicated that the superhydrophobic composite coating increased the corrosion resistance of Mg alloy by three orders of magnitude in 3.5 wt% NaCl solution. Furthermore, 72 h of electrochemical tests revealed that the composite coating could provide long-term corrosion protection for Mg alloy. It indicates that the combination of prior MAO and latter cyclic assembly will be a promising strategy to construct corrosion-resistant composite coating on Mg alloy substrate.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2018
·
IF 2.606
Kejia Kang,Rong Tu,Guoqiang Luo,Jian Zhang,Jiawen Zhu,Qiang Shen,Lianmeng Zhang
In this research, the high-temperature mechanical, electrical and thermal properties of arc-melted W-based composites with a small amount of SiC additives were investigated. The high-temperature mechanical properties of tungsten were enhanced by the presence of the hard ceramic phase (W 5 Si 3 and W 2 C) and the interaction of dislocations. The ceramic phase also played a role in inhibiting the grain growth at high temperatures. The ultimate compressive strength (UCS) of the W with 1 wt% SiC (S1) was 968.9 MPa at 1273 K, which is three times that of pure W (291.9 MPa) at 1273 K, showing a significant enhancement in high-temperature strength . Both thermal conductivity ( κ ) and electrical conductivity ( σ ) decreased with the increasing of SiC addition. With increasing temperature, the σ decreased while the κ increased due to the intrinsic behavior of the ceramic phase in the composites.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Fanyue Meng,Chenbin Lin,Bing Song,Lei Yu,Yan Zhao,Zejian Zhi,Min Song
This study employed a self-designed underwater arc discharge (UAD) plasma reactor, which combined advanced oxidation process (Fe 2 O 3 -CoFe 2 O 4 /PMS) and low-temperature plasma technology to efficiently degrade refractory organic pollutants (i.e. phenol, p-chlorophenol, p-nitrochlorobenzene). The results illustrated that the plasma/PMS/Fe 2 O 3 -CoFe 2 O 4 system possessed high degradation efficiency and TOC removal rate towards three target pollutants (phenol: 99.8%, 96.12%; 4-CP: 98.4%, 86.48%; p-NCB: 99.9%, 88.31%). With the help of in-situ variable temperature EPR and Indigo colorimetry method, ·OH, SO 4 ·- , O 2 ·- , 1 O 2 and O 3 were identified as the main reactive oxygen species (ROS) for the degradation of target pollutants, revealing the synergistic catalytic mechanism between plasma and Fe 2 O 3 -CoFe 2 O 4 for PMS activation and inferring the degradation pathways of target pollutants. The results confirmed that the plasma/PMS/Fe 2 O 3 -CoFe 2 O 4 system was feasible for the degradation of refractory organic pollutants, has the advantages of high efficiency and low energy consumption, and could provide an effective strategy for the treatment of refractory organic pollutants in groundwater/soil.
研究领域:
环境科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Yada Li,Weiqiang Wang,Fengyun Yu,Dongjiao Wang,Shiwei Guan,Yan Li,Min Qi
Calcium (Ca) and strontium (Sr) are beneficial for bone reconstruction. This study incorporated Ca and Sr into the TiO 2 coatings by one-step micro-arc oxidation (MAO) treatment with CaO and SrO added in tetraborate electrolytes. The structure, composition, hydrophilicity, ion release, and cytocompatibility of the coatings were studied. The coatings combine layered micron-scale pores in various sizes and nano-scaled pores, forming a hierarchical structure. This hierarchical structure is highly porous and super-hydrophilic. The coatings are composed of Ti, O, and B, as well as Ca or Sr. Ca and Sr mainly distribute in the outer layer of the coatings and exist in the forms of carbonates and oxides. The formation of the coatings was discussed. Ca and Sr incorporated into the coatings are readily released into aqueous solutions. The homogeneous surface structure of the coatings leads to an excellent and approximating performance in hydrophilicity, as well as the adhesion and spreading of the human bone marrow-derived mesenchymal stem cells (hBMSCs). The simultaneous incorporation of Ca and Sr incorporation exhibits superior facilitation in the proliferation of hBMSCs compared with single Ca or Sr incorporation. This study shows a promising method to incorporate bioactive elements into the MAO coatings on titanium surfaces.
研究领域:
生物材料
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·Vol. 55
·期 5
·3995-4000
·
IF 2.4
Chen Angran,Zhang Yanyun,Coetsee Theresa,Kaldre Imants,Wang Cong
EH36-shipbuilding steel has been welded by CaF 2 -ZrO 2 fluxes with designed ZrO 2 additions. Possible chemical and electrochemical reactions have been postulated to analyze alloying element transfer behaviors. The decomposition of ZrO 2 during SAW has been validated by applying the gas–slag–metal equilibrium model and the O supply capacity of ZrO 2 has been quantified. For the entire compositional range, O content has been controlled within a well-maintained range from 220 to 400 ppm, and the transferred quantity of Zr content reaches to the maximum value of 120 ppm. It is further demonstrated that ZrO 2 addition incurs appreciable Si loss within the weld metal.
研究领域:
材料科学
·
焊接工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）