Metals
·
2019
·Vol. 9
·期 2
·171
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IF 2.259
Zhengyu Cai,Hui Kong
TiO2nanoparticles and Mg alloy were added to molten steel in sequence to investigate the inclusion and microstructure characteristics. Compared with a non-treated sample, these additives resulted in the formation of Ti–Mg-bearing inclusions, which proves that the additives were valid. The size evolution from nanometer-scale TiO2to micrometer-scale oxides hints at the agglomeration and growth of the TiO2nanoparticles, which is due to the possible formation of a liquid-capillary force, the decomposition reaction of TiO2, and the higher Gibbs free energy of the nanoparticle. Furthermore, the statistical analysis of the oxides indicated that with the addition of the TiO2nanoparticles and Mg alloy, the oxides were refined and their density was higher. Few pure MnS were observed in the treated sample. This is due to the fact that most oxides separated out in the liquid region at 1873 K based on the oxide composition and the calculated Al2O3–Ti3O5–MgO phase diagram. Thus, MnS preferred to segregate on them during solidification. After etching, it was found that the Ti–Mg-bearing oxide can induce the nucleation of intragranular acicular ferrites. The appearance of these acicular ferrites was not observed in the non-treated sample. This comparison indicates the effectiveness of the external adding method in oxide metallurgy.
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JOURNAL OF POWER SOURCES
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2017
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IF 6.395
Minghong Huang,Liuzhang Ouyang,Jiangwen Liu,Hui Wang,Huaiyu Shao,Min Zhu
In this work, flower-like MoS 2 spheres are synthesized via a hydrothermal method and the catalytic activity of the as-prepared and bulk MoS 2 on hydrolysis of Mg is systematically investigated for the first time. The Mg-MoS 2 composites are prepared by ball milling and the hydrogen generation performances of the composites are investigated in 3.5% NaCl solution. The experimental results suggest that the as-prepared MoS 2 exhibits better catalytic effect on hydrolysis of Mg compared to bulk MoS 2 . In particular, Mg-10 wt% MoS 2 (as-prepared) composite milled for 1 h shows the best hydrogen generation properties and releases 90.4% of theoretical hydrogen generation capacity within 1 min at room temperature. The excellent catalytic effect of as-prepared MoS 2 may be attributed to the following aspects: three-dimensional flower-like MoS 2 architectures improve its dispersibility on Mg particles; make the composite more reactive; hamper the generated Mg(OH) 2 from adhering to the surface of Mg; and increase the galvanic corrosion of Mg. In addition, a hydrogen generator based on the hydrolysis reaction of Mg-0.2 wt% MoS 2 composite is manufactured and it can supply a maximum hydrogen flow rate of 2.5 L/min. The findings here demonstrate the as-prepared flower-like MoS 2 can be a promising catalyst for hydrogen generation from Mg.
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JOURNAL OF HYDROLOGY
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2026
·
IF 6.3
Bowen Li,Tingting Yang,Shibin Liu,Meng Yao,Jun Dong
The uneven distribution of colloidal Mg(OH) 2 in heterogeneous porous media poses a significant challenge for its effective application in groundwater remediation. To address this issue, this study introduces a novel approach using xanthan gum (XG) as a viscosity modifier to enhance the migration of colloidal Mg(OH) 2 into low permeability zone. Results indicate that XG is highly compatible with colloidal Mg(OH) 2 , viscosity modified colloidal Mg(OH) 2 (VMC-Mg(OH) 2 ) exhibits significant shear thinning properties. The increased viscosity effectively reduces the deposition of colloidal Mg(OH) 2 and facilitates its return to groundwater. With the addition of XG to the system, the collision efficiency ( η ) between colloidal Mg(OH) 2 and porous media decreased from 0.00865 to 0.00142, while the attachment efficiency ( α ) was reduced from 0.4858 to 0.1038. These variations notably enhance the migration performance of colloidal Mg(OH) 2 , with C/C 0 increasing from 0.12 to 0.94. The incorporation of XG also leads to a substantial increase in colloidal Mg(OH) 2 sweep efficiency in low permeability zone, rising from 53.6 % to 92.5 % as the XG concentration increased from 0 mg/L to 200 mg/L. Moreover, the simulation of collision efficiency ( η ) and attachment efficiency ( α ) accurately predicts the migration of VMC-Mg(OH) 2 in heterogeneous porous media, with a maximum error of 5.39 %. These findings highlight the significant potential of VMC-Mg(OH) 2 as a reactive reagent for remediating contamination in low permeability zone
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2026
·
IF 2.6
Soliman Hanaa,Taieh Nabil Kadhim,Wan Guojiang,Hussien Hoda M.
Biodegradable magnesium is a promising orthopedic implant, but one challenge is reducing its corrosion rate. The first question that jumps to the reader’s mind is choosing an organic film or an inorganic one to isolate Mg. Here, a duplex-layer strategy has been studied: an organic film of hexamethylenediaminetetrakis (methylenephosphonic acid) HMDTMPA and two top layers of an inorganic film of TiO 2 or another organic film of stearic (St). A comparison will be carried out in light of SEM, AFM, EDS, XRD, XPS, FTIR, and water contact angle (WCA) measurements. Double layers of the organic film created more thickness (6.8 μm) but otherwise almost the same efficiency as a single film (4.3 μm), due to the same bonding ability of O-H and C-C, shifting the coating toward hydrophilicity attitude (57°). On the other hand, inorganic TiO 2 generates finer particles that are arranged compactly, facilitating denser packing (7.2 μm), reducing voidages on the surface and promoting hydrophobicity (146°) and consequently reinforcing Mg insulation. Graphical The alternative text for this image may have been generated using AI.
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Nature Communications
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2026
·
IF 18.1
Yang Jiawei,Zhu Rui,Li Ming,Mei Zengxia,Chen Ling,Wu Li-Ming
Sustainable thermal management of high-heat-flux electronics beyond Moore’s Law requires micro thermoelectric coolers (μ-TECs) that are both high-performance and environmentally sustainable. However, state-of-the-art μ-TECs rely on Bi 2 Te 3 -based materials, whose tellurium scarcity, toxicity concerns and limited mechanical robustness hinder widespread adoption. Mg-based thermoelectric materials offer a promising alternative but remain challenging to integrate into microscale devices. Here we show that a low-temperature, water-free fabrication strategy enables tellurium-minimized μ-TECs based on n -type Mg 3 (Bi,Sb) 2 and p -type MgAgSb. Using magnetron sputtering as a cold bonding approach, we fabricate compact 12-pair microdevices (2.95 × 4.35 × 1.4 mm 3 ), with thermoelectric legs approximately 3% the size of previously reported Mg-based devices. The resulting μ-TECs achieve a power density of 4.34 W cm −2 and a packing density of 93.5 pairs cm −2 . Our work establishes a scalable route for sustainable thermoelectric cooling and a viable alternative to conventional Bi 2 Te 3 technologies.
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PubMed
高影响因子
Archives of Civil and Mechanical Engineering
·
2026
·Vol. 26
·期 3
·121
·
IF 4.9
Zhang Kaifei,Sun Youping,Li Wangzhen,He Jiangmei,Chen Wengang,He Chengwei
This study comprehensively investigated the influence of varied hot rolling temperatures on the microstructure, mechanical properties, and corrosion behavior of Mg-2Zn-0.1Ca alloy in a simulated physiological environment. Advanced characterization techniques, including Field Emission Scanning Electron Microscopy (FESEM) and Electron Backscatter Diffraction (EBSD), were employed for detailed microstructural analysis. Corrosion performance was systematically evaluated through mass loss, hydrogen evolution, and electrochemical polarization tests. Results indicate that increasing rolling temperature progressively enlarged the alloy’s grain size, peaking at 15.06 μm at 400 ℃. Concurrently, the degree of dynamic recrystallization (DRX) and the fraction of high-angle grain boundaries (HAGBs) exhibited a synchronized increase. Notably, the alloy rolled at 300 ℃ displayed the highest dislocation density, attributed to a significantly higher rate of dislocation multiplication than annihilation. The ultimate tensile strength (UTS) generally decreased with rising rolling temperature, with the 250 ℃ rolled specimen achieving the maximum UTS of 218.34 MPa. Conversely, the 300 ℃ rolled alloy exhibited superior elongation (EL) of 19.8%. The damping performance at room temperature exhibits a monotonically increasing trend with rising rolling temperature, with the alloy achieving optimal damping properties at 400 ℃. Regarding corrosion performance, at the 400 ℃ rolling process, the alloy’s corrosion rate is minimized. This superior performance is primarily attributed to its lower grain boundary density, more homogeneous microstructure, and the formation of a dense passive film on the surface, which synergistically impede further corrosive medium penetration.
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Nano-Micro Letters
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2026
·Vol. 18
·期 1
·291
·
IF 38.5
Shi Yuan,Zhang Ziyi,Bai Lei,Li Dingding,Shi Jingbo,Yue Zongye,Yuan Tianyu,Bai Jinbo,Bai Jintao,Leng Kunyue,Li Xiaolin,Wang Xuejing,Qu Yunteng
Metal–nitrogen–carbon catalysts have emerged as promising alternatives to costly platinum group catalysts in fuel cells and metal–air batteries; however, further enhancement of their activity in both alkaline and acidic media is still required. Here, we present a FeMg–N–C dual-atom catalyst that demonstrates excellent oxygen reduction reaction (ORR) performance, achieving notably high half-wave potentials (E 1/2 ) of 1.004 V in alkaline media and 0.881 V in acidic media. Additionally, the FeMg–N–C catalyst delivers peak power densities of 530.1 mW cm −2 in Zn–air cells and 1.06 W cm −2 in H 2 –O 2 fuel cells. Experimental and theoretical analyses reveal that the enhanced ORR activity arises from the spin state transition of Fe sites from low spin to medium spin, induced by adjacent Mg sites. This medium-spin Fe site exhibits strong adsorption of *O 2 and weak adsorption of *OH, effectively facilitating the initial ORR step and the removal of *OH. This work paves a novel pathway to design and construct well-performing electrocatalysts via the spin regulation strategy.
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SOLAR ENERGY
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2026
·
IF 7.9
Qixin Chen,Zhongchen Bai,Xu Wang,Xinghua Li,Min Feng,Zhengping Zhang
An ultrathin Mg-doped SnO 2 layer reconstructs the ETL surface. • SnO 2 /Mg-doped SnO 2 bilayer regulates the ETL/CsPbBr 3 interface. • Improved morphology and charge transport enhance device performance. • The optimized device achieves 8.74% PCE and 90.69% retention after 50 days. Incomplete surface coverage, localized exposure of ITO protrusions, and interfacial nonuniformity in solution-processed SnO 2 electron transport layers (ETLs) restrict the performance of hole-transport-layer-free (HTL-free) CsPbBr 3 perovskite solar cells (PSCs). Herein, a planar homojunction SnO 2 /Mg-doped SnO 2 bilayer ETL was fabricated by depositing an ultrathin Mg-doped SnO 2 layer on the SnO 2 surface to regulate the ETL/perovskite interface in an ITO/SnO 2 /CsPbBr 3 /carbon device architecture. This bilayer configuration improves surface coverage, interfacial contact, and energy-level alignment while preserving lattice compatibility within the SnO 2 -based system. The Mg-doped SnO 2 top layer reduces surface cracks and pits, limits local ITO exposure, decreases roughness, and improves precursor wettability. These changes promote the formation of CsPbBr 3 films with larger grains, fewer pinholes, better vertical morphology, higher crystallinity, and a near-stoichiometric composition. The PL, TRPL, EIS, dark J–V, XPS, and UPS results collectively indicate improved interfacial charge extraction, reduced defect-assisted non-radiative recombination, and more improved energy-level alignment at the ETL/perovskite interface. Consequently, the optimized HTL-free device achieved a champion PCE of 8.74% with a Voc of 1.520 V and retained 90.69% of its initial efficiency after 50 days of unencapsulated storage in air. This work indicates that introducing an ultrathin Mg-doped SnO 2 overlayer effectively reconstructs the ETL surface and regulates the ETL/perovskite interface, providing an effective interfacial regulation strategy for developing efficient and stable HTL-free all-inorganic PSCs.
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PHYSICA B-CONDENSED MATTER
·
2026
·
IF 3.2
Chang Feng,Qian Jing,Li Tang,Jiangping Jing,Ruiling Wang,Zhuoyuan Chen
S-C 3 N 4 /Mg(OH) 2 heterojunction photocatalyst was synthesized via a simple ball-milling method. • S-C 3 N 4 /Mg(OH) 2 exhibited significantly enhanced photocatalytic performance. • S-C 3 N 4 /Mg(OH) 2 demonstrated stable photocatalytic activity in complex ionic environments. • The photocatalytic reaction mechanism of S-C 3 N 4 /Mg(OH) 2 was proposed in this work. This work fabricated a type II 2D/2D S-doped graphitic carbon nitride/magnesium hydroxide (S-C 3 N 4 /Mg(OH) 2 ) heterojunction photocatalyst via a straightforward ball-milling method. The Mg(OH) 2 nanosheets are uniformly dispersed on the surface of S-C 3 N 4 , forming a well-developed heterojunction structure. The S-C 3 N 4 /Mg(OH) 2 composite material was employed as a photocatalyst and exhibited high efficiency in degrading tetracycline and methyl orange in an aqueous environment. The optimized S-C 3 N 4 /Mg(OH) 2 -30 composite demonstrated superior photocatalytic performance, achieving 100% removal of tetracycline within 45 min and 93% degradation of methyl orange within 60 min. Its performance was significantly superior to that of the single-component photocatalysts, and it exhibited stable photocatalytic activity even in complex ionic environments. The formation of Type-II heterojunction between S-C 3 N 4 and Mg(OH) 2 facilitates charge separation/migration and thus significantly enhanced pollutant removal efficiency. The S-C 3 N 4 /Mg(OH) 2 composite material fabricated in this work shows great promise for practical wastewater treatment applications. The S-C 3 N 4 /Mg(OH) 2 heterojunction photocatalyst was successfully fabricated. It not only exhibits outstanding photocatalytic performance in degrading organic pollutants but also maintains stable photocatalytic degradation ability even under complex ionic conditions. Download: Download high-res image (368KB) Download: Download full-size image
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APPLIED THERMAL ENGINEERING
·
2026
·
IF 7.5
Sen Liu,Mi Li,Zhanjun Yang,Matko Erceg,Lin Jiang
Inert silica is repurposed as a potent modifier for Al-Mg/AP energetic composites. • 5 wt% SiO 2 reduces ignition delay by 35% and increases maximum flame area by 226%. • Optimal SiO 2 loading boosts pressurization rate by 126% in closed vessel tests. • 9 wt% SiO 2 reduces AP decomposition activation energy by 78 kJ/mol. Silica (SiO 2 ) is generally regarded as a chemically inert and low-cost material that is widely present in natural minerals and daily life. In conventional energetic formulations, SiO 2 is rarely considered an active component because of its high thermodynamic stability and low thermal conductivity. Herein, we demonstrate that mesoporous SiO 2 can serve as an effective reactive additive in Al-Mg/ammonium perchlorate (AP) energetic composites, participating in high-temperature aluminothermic reactions and regulating the overall energy-release behavior of the system. In this work, AP/SiO 2 precursor particles were prepared by spray drying, followed by solvent-assisted assembly with Al Mg alloy powder to obtain Al-Mg/(AP/SiO 2 ) composite energetic materials with different SiO 2 contents. The morphology, phase structure, combustion behavior, pressure output, thermal decomposition characteristics, evolved gaseous products, and post-combustion residues were systematically investigated using SEM, EDS, XRD, high-speed imaging, infrared thermography, closed-bomb pressure testing, TG-DSC, and TG-IR analyses. The results reveal that the introduction of mesoporous SiO 2 markedly alters the decomposition behavior of AP, promotes gas evolution, enhances ignition and combustion propagation, and modifies the condensed-phase reaction pathway of the Al-Mg/AP system. These effects are attributed to the combined roles of mesoporous confinement, surface silanol-assisted AP decomposition, local hotspot formation, and the participation of SiO 2 in aluminothermic reactions. This study provides new insight into the unconventional role of inert oxides in energetic combustion systems and offers a low-cost strategy for designing alternative multifunctional reactive additives and regulating energy-release mechanisms in metal-based energetic materials. Download: Download high-res image (182KB) Download: Download full-size image
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DENTAL MATERIALS
·
2026
·
IF 6.3
Meng Bo,Jiao Fang,Yuning Wu,Zixuan Chen,Yingchi Liu,Shuang Liu,Chunyan Li,Lin Wang,Xiaolin Sun
A metabolically reprogrammed MnO₂-Mg/Pt@BBF nanozyme is developed for periodontitis treatment. • Mg²⁺ amplifies endogenous H₂O₂ production via SpxB in Streptococcus gordonii. • Pt decoration enriches catalytically active Mn²⁺ to enhance chemodynamic therapy. • Covalently immobilized BBF inhibits LuxS/AI-2 quorum sensing and disrupts biofilm cohesion. • The nanozyme reduces bacterial burden, alveolar bone loss, and inflammation in vivo . Objectives To overcome the intrinsic incompatibility between dense periodontal biofilms and chemodynamic therapy (CDT), we developed a vacancy–engineered MnO₂ nanozyme that integrates redox–state programming, Mg²⁺–enabled endogenous H₂O₂ amplification, and covalently immobilized quorum–sensing inhibition for the local treatment of periodontitis. Methods Mg²⁺–coordinated MnO₂ nanoflowers were decorated with Pt nanoparticles and covalently functionalized with BBF. Physicochemical properties, Mn valence states, H₂O₂ and ·OH generation, LuxS/AI–2 signaling, Porphyromonas gingivalis metabolomic changes, antibiofilm activity, and therapeutic efficacy in rat periodontitis were evaluated. Results Pt decoration increased the Mn²⁺ fraction from 33% to 51%, while Mg²⁺ enhanced SpxB–mediated H₂O₂ production by Streptococcus gordonii . Immobilized BBF reduced AI–2 activity from 67.8% to 22.8% and downregulated luxS, fimA, mfa1, kgp, and rgpA . In dual–species biofilms, MnO₂–Mg/Pt@BBF yielded 68.7% dead cells, an approximately 4–log₁₀ reduction in viable bacteria, and the lowest residual thickness. Metabolomics revealed depletion of G6P, R5P, NADPH, ATP, and α–ketoglutarate in P. gingivalis. In vivo , treatment reduced periodontal bacterial burden by approximately 3 orders of magnitude and decreased the CEJ–ABC distance from 1.44 ± 0.28 mm to 0.56 ± 0.15 mm, accompanied by reduced inflammation and IL-6 expression, improved collagen organization, and elevated Arg-1 levels. Significance This locally deliverable platform couples vacancy/valence–tuned catalysis, Mg²⁺–primed endogenous oxidant supply, and surface–immobilized quorum–sensing blockade, offering a composition–guided strategy for controlling polymicrobial periodontal biofilms and limiting infection–associated tissue destruction.
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高影响因子
Science China-Technological Sciences
·
2026
·Vol. 69
·期 4
·1420202
·
IF 5.1
Iqbal Mujahid,Yasin Aqeela,Guan Shaokang,Guo Jiacheng,Hou Yachen,Li Jingan,Tang Junnan
Ischemic stroke remains a leading global cause of mortality and disability, creating an urgent need for improved treatments. Biodegradable magnesium (Mg) alloy stents represent a promising advancement for cerebrovascular applications due to their inherent biocompatibility, mechanical suitability, and unique neuroprotective properties conferred by Mg ions. However, the clinical translation of Mg alloy stents, particularly for sensitive cerebral vasculature, is hindered by two major bottlenecks: uncontrolled rapid degradation leading to premature structural failure and delayed endothelialization contributing to restenosis and thrombosis. Addressing the critical issue of biological functionality, this study develops a novel sulfonated hyaluronic acid-tyrosine microsphere (S-HA-Tyr@microsphere) coating on ZE21B Mg alloy. Monodisperse S-HA-Tyr microspheres were precisely fabricated using microfluidics and stabilized via a visible-light catalyzed tris(2,2-bipyridyl)-dichlororuthenium(II)/Sodium persulfate (Ru/SPS) system, forming a robust dityrosine bond network. This multifunctional coating integrates corrosion resistance (primarily achieved through an established MgF 2 interlayer), strong anchoring (PDA layer), and enhanced bioactivity (S-HA-Tyr@microspheres). The S-HA-Tyr@microsphere coating significantly improved hemocompatibility, reducing hemolysis to 0.35% ( p < 0.01) and platelet adhesion by 83.7% ( p < 0.001). Crucially, it promoted endothelial cells (ECs) migration and proliferation ( p < 0.01) while inhibiting smooth muscle cells (SMCs) overgrowth ( p < 0.05) and inducing macrophage M2 polarization ( p < 0.01), demonstrating excellent cell-specific regulation. In vivo evaluation confirmed the efficacy: abdominal aortic implantation in rats for 28 d revealed a superior diameter retention for the coated implants compared to bare alloy ( p < 0.05) and showed continuous endothelium with reduced neointimal formation ( p < 0.01). This innovative coating strategy facilitates both degradation control and accelerated endothelialization, overcoming key biological barriers for the clinical application of biodegradable Mg alloy cerebrovascular stents.
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