Materials Science & Engineering C-Materials for Biological Applications
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2013
·Vol. 33
·期 8
·5044-5050
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IF 2.404
Y.H. Xia,B.P. Zhang,C.X. Lu,L. Geng
In this paper, corrosion resistance of the Mg–4.0Zn–0.2Ca alloy was modified by micro-arc oxidation (MAO) process. The microstructure and phase constituents of MAO layer were characterized by SEM, XRD and X-ray photoelectron spectroscopy (XPS). The corrosion resistance of MAO treated Mg–4.0Zn–0.2Ca alloy in the simulated body fluid were characterized by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The microstructure results indicated that a kind of ceramic film was composed by MgO and MgF 2 was formed on the surface of Mg–4.0Zn–0.2Ca alloy after MAO treatment. The electrochemical test reveals that the corrosion resistance of MAO treated samples increase 1 order of magnitude. The mechanical intensity test showed that the MAO treated samples has suitable mechanical properties.
研究领域:
生物医学工程
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材料科学
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生物材料
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表面工程
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腐蚀科学
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高影响因子
SURFACE & COATINGS TECHNOLOGY
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2023
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IF 5.4
Runjia Liu,Yan Liu,Qiwen Yong,Zhi-Hui Xie,Liang Wu,Chuan-Jian Zhong
The long-term corrosion resistance of conventional micro-arc oxidation (MAO) coatings on magnesium alloy is limited by the inherent micro-scale pores. To address this issue, zeolitic imidazolate framework-8 (ZIF-8) and zinc gluconate (ZnG) loaded ZIF-8 (ZnG@ZIF-8) were synthesized and incorporated into the MAO coating. The electrochemical and immersion tests showed that the MAO composite coating doped with ZIF-8 and ZnG@ZIF-8 ((ZIF-8 + ZnG@ZIF-8)/MAO) displayed optimal corrosion resistance. The corrosion current density ( j corr ) of the pristine (ZIF-8 + ZnG@ZIF-8)/MAO composite coating (3.38 nA cm −2 ) is 63.3 times lower than that of the blank MAO coating (214 nA cm −2 ), indicating the significant enhancement in corrosion protection of the nanoparticle to the coatings. Even after 32 days of immersion in a 3.5 wt.% NaCl solution, the j corr of the former was as low as 87.3 nA cm −2 , much lower than that of the blank MAO coating (1710 nA cm −2 ). These findings provide new insights into the design of corrosion-resistant MAO composite on magnesium alloy surfaces via the incorporation of inhibitor-loaded ZIF-8 nanocontainers.
研究领域:
材料科学
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表面工程
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腐蚀防护
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纳米技术
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RESOURCES CONSERVATION AND RECYCLING
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2024
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IF 11.2
Jingdong Huang,Xiao Yang
Natural Zn reserves may be exhausted in the coming decades. Electric arc furnace (EAF) dust is an essential secondary Zn resource. However, the traditional methods for separating Zn from EAF dust are plagued by high energy consumption, large carbon emissions, and severe environmental pollution, which hinder sustainable development. To address these challenges, a novel technology using molten MgCl 2 has been proposed. Under an air atmosphere at 1000°C, the chlorination percentage of Zn can exceed 97%. The ZnCl 2 content in the volatile products can reach up to 85 mass%, with minor impurities consisting mainly of PbCl 2 , KCl, and NaCl. Molten salt electrolysis experiments indicate that removing Pb 2+ and Fe 3+ ions and subsequently preparing metallic Zn is feasible. With its streamlined process, characterized by high efficiency and low energy consumption, this technology offers a clean and sustainable solution for metal recovery from EAF dust.
研究领域:
冶金工程
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环境科学
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JOURNAL OF CHROMATOGRAPHY A
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2024
·
IF 3.8
Yuanji Gao,Yijun Liu,Xingyu Li,Kaineng Huang
Herein, ambient electric arc ionization mass spectrometry was used to examine 16 plasticizers in various wrap films, demonstrating high sensitivity (detection limit: <0.2 ng/mg) and precision (intra-/inter-day precision: <12 %). The ease of operation helps in the identification of wrap film and plasticizer analysis. In addition, the introduction of a cold arc plasma treatment presents a practical and innovative method for effectively eliminating plasticizers. This innovative strategy has implications for both environmental protection and food safety.
研究领域:
环境科学
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食品安全
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分析化学
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DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
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2020
·
IF 6.785
Su-zhen Zhu,Li Zhang,Jing Zhang,Yin-long Guo
Fingerprinting mass spectrometric analysis at atmospheric conditions has been realized using an arc plasma-based dissociation (APD) device. Because of its high energy, high temperature, and unique chemical reactivity, the thermal plasma can induce dissociation of neutral molecules or ions produced by atmospheric ion sources. Both even/odd electron (fragment) ions would be generated to provide fingerprinting structural information and molecular weight of the compounds simultaneously. Meanwhile, elimination and aromatization were observed as special dissociation patterns in this device, which can be applied in the differentiation of isomers. The good compatibility with atmospheric ion sources is demonstrated by coupling the device with nanoelectrospray ionization (nano-ESI) and zero volt paper spray ionization (PSI), respectively. With erythromycin as the tuning standard, informative dissociation spectra of various compounds can be reproducible, making it possible to establish an arc plasma-based dissociation spectra database. This device allows fingerprinting mass spectrometric analysis, with no need for harsh vacuum conditions and is promising for making a breakthrough in making up the deficiency of atmospheric ionization techniques.
研究领域:
分析化学
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质谱学
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等离子体科学
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大气离子化技术
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PubMed
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Materials Research Express
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2020
·Vol. 7
·期 1
·016438
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IF 1.929
Yong Lian,Xianyi Dai,Jin Zhang
In the present work, particles of SiC were applied to the micro-arc oxidation (MAO) treatment of Ti6Al4V, characterization of MAO coatings with different SiC particle concentration were evaluated. X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) results show that the structure and morphology of MAO ceramic coatings could change with different amounts of SiC in the electrolyte. Both of the number and size of the pores on the ceramic coating surface were decreased, while the layer thickness increased with the increase in SiC particles in the electrolyte. A dense double-layer structure coating composed of a Ti-based layer and a SiC-based layer with a thickness of about 40 μm was prepared. It was shown that the addition of SiC particles participated in the process of micro-arc oxidation and changed the microstructure of MAO coating.
研究领域:
材料科学
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表面工程
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高影响因子
Journal of Orthopaedic Translation
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2023
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IF 6.6
Jieyang Dong,Jiaqi Zhong,Ruixia Hou,Xiaodong Hu,Yujiong Chen,Hangbin Weng,Zhewei Zhang,Botao Liu,Shengbing Yang,Zhaoxiang Peng
Background Pure magnesium-based ortho-implants have a number of advantages. However, vital parameters like degradation rate and biocompatibility still call for significant improvement. Methods In this study, poly (1,3-trimethylene carbonate) (PTMC) and polydopamine (PDA) bilayer and micro arc oxidation composite coatings were prepared successively on magnesium surface by immersion method and microarc oxidation. Its corrosion resistance and biocompatibility were evaluated by in vitro corrosion tests, cellular compatibility experiments, and in vivo animal experiments. Results In vitro experiments demonstrated that the composite coating provides excellent corrosion protection and biocompatibility. Animal studies demonstrated that the composite coating slowed the degradation of the implant and was not toxic to animal viscera. Conclusion In conclusion, the inorganic-organic composite coating proposed in this study provided good corrosion resistance and enhanced biocompatibility for pure magnesium implants. The translational potential of this article The translational potential of this article is to develop an anti-corrosion composite coating on a pure magnesium surface and to verify the viability of its use in animal models. It is hoped to open up a new approach to the design of new degradable orthopedic magnesium-based implants.
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ADVANCED MATERIALS
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2026
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IF 26.8
Kangwang Wang,Jie Zhan,Jun Liu,Zaichen Xiang,Wanyi Zhang,Lingyong Zeng,Kai Yan,Yan Sun,Huixia Luo
The photochemical CO 2 reduction reaction (CRR) represents a zero-carbon pathway for converting CO 2 into value-added chemicals, yet its industrial implementation has been constrained by low selectivity and product diversity. Dirac nodal arc semimetals characterized by ultrahigh carrier mobility (>25 000 cm 2 ·V −1 ·s −1 ) offer a promising platform to search for efficient catalysts for CO 2 conversion. Herein, we demonstrate that strategic Pt incorporation into PdSn 4 optimizes the electronic structure and carrier dynamics of this Dirac semimetal. Experimental and theoretical analyses reveal that the resulting Pd─Sn─Pt local electronic structure redistributes charge density around Pd and Pt atoms, which facilitates C─C coupling via *OC─COH and *OC─CHOH intermediates and enhances carrier mobility by 40% versus the pristine PdSn 4 single crystal. The optimized Pd 0.4 Pt 0.6 Sn 4 single crystal achieves C 2 H 4 i) formation rate of 328 µmol∙g −1 ∙h −1 ; ii) product selectivity of 73.1%; iii) electron-based selectivity of 89%. This work establishes electronic-structure-tunable Dirac semimetals as a new paradigm for multi-carbon photochemical CO 2 reduction, providing a design strategy for next-generation photocatalysts.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2026
·
IF 14.3
Wanqi Chen,Ruolan Tang,Bo Yang,Wenzhao Sun,Bo Zhang,Peize Lv,Banghe Lv,Haile Yan,Zongbin Li,Song Li,Liang Zuo
The Magnéli-phase λ-Ti 3 O 5 , characterized by its unique flat-band electronic structure, is a promising photothermal conversion material for solar-driven interfacial evaporation. However, its intrinsic thermodynamic instability at ambient temperature severely constrains large-scale practical application. To overcome this challenge, we developed a scalable synthesis strategy for stabilizing λ-Ti 3 O 5 via arc-melting followed by high-energy ball milling, coupled with Lithium (Li) doping. Structural and surface analyses confirm that Li incorporation effectively stabilizes the λ-phase. Morphological studies reveal particle refinement (∼1–2 μm) with increased surface roughness and oxygen vacancies, further enhancing solar absorption with overall reflectivity < 6% in the range of 250–2500 nm. Incorporating 10 wt.% of Li 0.25 Ti 2.75 O 5 particles into a Polyvinyl alcohol/Polyvinylpyrrolidone (PVA/PVP) porous hydrogel evaporator yielded an evaporation rate of 5.22 kg m −2 h −1 under one sun irradiation. Remarkably, the evaporator demonstrated excellent resistance to salt crystallization, maintaining stable performance during a 24-h continuous operation in 3.5 wt.% saline water. This work not only provides a practical and scalable approach for stabilizing λ-Ti 3 O 5 but also offers valuable insights into the development of efficient, durable photothermal materials for solar desalination technologies.
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VACUUM
·
2024
·
IF 3.8
Guangfeng Zhou,Haijun Wu,Yayu Deng,Rui Miao,Deyong Lai,Jingui Deng,Jian Zhang,Qian Chen,Qingyi Shao,Cairu Shao
Carbon nanotubes (CNTs) are a significant candidate for future channel materials for high-performance electronic devices, and this has attracted the attention of many researchers. Due to the scattering of defects in carbon nanotubes, the migration of charge carriers is greatly reduced, and the synthesis of defect free carbon nanotubes is an urgent and important issue that needs to be addressed. In this study, high-purity graphite powder served as the carbon source, and iron served as the catalyst to synthesize defect free MWCNTs through direct-current arc discharge (AD) in a nitrogen atmosphere. The effects of different pressures and catalysts on the yield and morphology of CNTs were studied. As the nitrogen pressure inside the vacuum chamber increases, the MWCNTs become longer and more erect. Fe has a high defect repair efficiency, which promotes the synthesizing of lattice-perfect and defect-free MWCNTs. It is found that the MWCNTs mainly exist in the iron mesh near the cathode. Using iron as a catalyst, we synthesize very straight MWCNTs with clearer walls under nitrogen pressure of 60 kPa. The results show that the method is characterized by low cost, implementability, and the ability to synthesize high-quality, defect free MWCNT compared to the conventional AD method.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Changkai Wang,Hailin Lu,Xiangheng Zheng,Huiyun Yang,Bowen Xue,Fang Guo
Although the microarc oxidation (MAO) technique can improve the properties of metals, there is still room for improvement in the tribological properties of MAO coatings. In this study, reduced graphene oxide (rGO) films were successfully prepared on the surface of MAO coatings using high-pressure ethanol vapor, which significantly improved the tribological properties of MAO coatings. The microscopic morphology of the rGO/MAO coatings was analyzed by scanning electron microscopy (SEM), and the sealing effect of the rGO coatings on the micropores of the MAO coating surface was further confirmed by a 3D profile scanner. Then, X-ray photoelectron spectroscopy (XPS) was used to investigate the changes in the GO structure of the MAO coating surface before and after high-pressure ethanol vapor reduction. Finally, tribological experiments were conducted to evaluate the tribological properties of rGO/MAO. The results showed that the coefficient of friction (COF) of the prepared rGO films was reduced by 45.13% and the wear resistance of the MAO coatings was extremely improved. This innovative approach provides a feasible solution for the development of composite coatings, which can be widely applied in the field of coating preparation.
研究领域:
材料科学
·
表面工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Hao Zhao,Xin Zhao,Zhenzhen Hui,Lan Li,Yuansen Liu,Xueqing Yang,Xiaochen Huang
This study investigated the erosion and degradation mechanisms of Ti 2 SnC during arc discharge at 9 kV across varying gas mixtures (N 2 /CO 2 , SF 6 /CO 2 , SF 6 /N 2 ) using a custom-built experimental setup with controllable ambient atmosphere. Arc parameters were recorded in real time using an oscilloscope. The microscopic and three-dimensional morphologies of the eroded zones were examined by scanning electron microscopy (SEM) and three-dimensional laser scanning confocal microscopy (3D SLCM). The composition of the eroded regions was characterized through X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS), revealing the arc erosion mechanism of Ti 2 SnC in these mixed atmospheres. The results demonstrate that arc parameters are significantly influenced by the ambient atmosphere. The highest arc energy, arc duration, and eroded area were observed in the N 2 /CO 2 mixture, decreasing in the order N 2 /CO 2 , SF 6 /CO 2 , SF 6 /N 2 , while the breakdown strength exhibited the opposite trend. The eroded regions in all mixed atmospheres exhibited an approximately elliptical shape with typical arc erosion features such as protrusions, craters, pores, and cracks, the morphology of which is governed by the arc structure. The ionization priority of the mixed atmosphere and the arc energy collectively determine the composition of the final erosion products: SnO 2 and TiO 2 predominantly formed in N 2 /CO 2 , SnO 2 and SnF 4 were the main products in SF 6 /CO 2 , and Sn 3 N 4 was primarily generated in SF 6 /N 2 . This research expands the application scope of MAX phase materials and provides a theoretical foundation for the design of novel electrical contact materials.
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