ACS Omega
·
2026
·
IF 5.2
Liyuan Wang,Bingbing Lai,Xiaoyu Wang,Bo Dai,Yujuan Zhang,Wenjing Lou
Traditional bentonite grease suffers from inadequate tribological properties. Layered double hydroxides (LDHs) have great potential as lubricant additives owing to their unique lamellar structure, tunable chemical composition, and high anion-exchange capacity, which enable strong interfacial interactions and stable dispersion in lubricating media. In this study, Mg Al-layered double hydroxide (MA-LDH) was synthesized as a crystalline lamellar compound with a controllable morphology and particle size. MA-LDH was prepared under hydrothermal conditions at pH 8–12 and 120–180 °C. The effects of MA-LDH synthesis conditions and additive concentration on the properties of bentonite grease were systematically investigated. Scanning electron microscopy revealed that the particle size distribution of MA-LDH became increasingly nonuniform as the pH and hydrothermal temperature increased. MA-LDH synthesized at pH 10 and 120 °C exhibited excellent particle size uniformity and dispersibility. Within the investigated additive range (0.1–12 wt %), an MA-LDH concentration of 1.5 wt % produced the best tribological performance. Compared with the base bentonite grease, the grease containing 1.5 wt % MA-LDH showed a 34.2% reduction in average coefficient of friction, an 89.2% decrease in wear volume, and a 150% increase in load-carrying capacity. The incorporation of MA-LDH optimizes load distribution, facilitates interfacial sliding, and enhances the film-forming ability, thereby improving the tribological performance of the bentonite grease.
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高影响因子
Journal of Materials Research and Technology-JMR&T
·
2026
·
IF 7.3
Wancheng Ge,Yongqiang Zhang,Shufang Zhang,Rongfang Zhao,Man Xiao,YuRou Qiu,Dizhu Yue,Rongfa Zhang
Although Mg alloys exhibit excellent application prospects in some areas where lightweighting is very critical, their poor corrosion resistance severely restricts their engineering applications. In this study, a near-neutral pH solution mainly containing hexamethylenetetramine (HMTA), sodium phytate, K 2 ZrF 6 , Na 2 B 4 O 7 and Na 3 PO 4 was selected and MAO coatings were successfully prepared on WE43 Mg alloys by micro-arc oxidation (MAO) under different constant voltages. The fabricated MAO sample under 520 V achieves good corrosion resistance and its i corr value is three orders of magnitude lower than that of Mg substrate. Then, the corrosion inhibition behavior and the underlying mechanism of electrolytic components on Mg alloys were systematically investigated. The results elucidate, for the first time, that before MAO treatment, Mg substrate is initially corroded and then the micro-corrosion areas are healed by the MAO solution through adsorption stage, chemical reaction stage and surface deposition stage. Before MAO treatment, all electrolytic components synergistically passivate the Mg substrate. Among four electrolytic components, the anticorrosive ability on WE43 Mg alloys is ranked as 360 g/L HMTA >5 g/L Na 3 PO 4 > 2 g/L K 2 ZrF 6 > 12 g/L sodium phytate. These results will provide a basis for future screening of suitable electrolytes and the preparation of high corrosion-resistant coatings.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Chaoying Zhang,Qian Jia,Guoqiang Li,Feng Li,Haitao Cui,Congming Li,Lei Li
An ultramicroporous variant of Mg-MOF-74 is synthesized through a mixed-linker strategy incorporating ethylenediaminetetraacetic acid (EDTA) as exotic linker. • An exclusive H 2 O adsorption site is created based on the uncoordinated oxygen atoms of EDTA. • The hydrogen-bonding network within EDTA-modified frameworks enhances CO 2 adsorption by 14.3 % via the formation of carbonates. • Incorporating EDTA molecules increases the CO 2 /N 2 selectivity by a factor of 2.28 compared to pristine Mg-MOF-74. • The EDTA-modified Mg-MOF-74 outperforms the pristine Mg-MOF-74 with a two-fold enhancement in CO 2 uptake under humid conditions. Mg-MOF-74 ([Mg 2 (DOBDC)]) represents a high-performance solid adsorbent for carbon capture, however, its CO 2 uptake decreases significantly under humid flue gas conditions due to competitive adsorption between H 2 O and CO 2 molecules. Herein, a mixed-linker modification strategy is employed by integrating ethylenediaminetetraacetic acid (EDTA) into the Mg-MOF-74 framework. This approach preserves the original one-dimensional pore structure while altering the coordination environment of Mg 2+ sites, reducing their coordination number to five. The resulting structure with uncoordinated oxygen atoms from EDTA serves as exclusive adsorption centers for H 2 O thereby protecting the CO 2 adsorption capacity. The optimized MOFs exhibits a high CO 2 adsorption capacity (6.4 mmol/g, at 1 bar) and outstanding CO 2 /N 2 selectivity (346). In humid CO 2 /N 2 (15:85, v:v, at 314 K, RH% = 86%) breakthrough experiment, the EDTA-modified frameworks maintain stable CO 2 uptake (3.92 mmol/g), consistent with dry performance, whereas the pristine Mg-MOF-74 shows a great reduction (2 mmol/g). In-situ FTIR further reveals that the incorporation of EDTA facilitates the formation of hydrogen bonding and carbonate species, synergistically enhancing the moisture resistance of MOF materials. Moreover, the modified material retains stable breakthrough times over six consecutive adsorption-desorption cycles under high-humidity conditions, demonstrating its great potential for scalable industrial carbon capture applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Fuzhen Li,Ruixue Sun,Kezheng Chen
In this work, the anodized coating was firstly prepared at low voltage on AZ31B Mg alloy , and followed by one-step hydrothermal treatment to produce stearic acid modified CeO 2 coating with superhydrophobic performance. The anodized coating prepared at low voltage combined well with the substrate without obvious micropores and microcracks . The outer stearic acid modified CeO 2 coating with spherical morphology covered the inner anodized coating compactly. The composite coating showed excellent superhydrophobicity (CA=164.7º) and self-cleaning performance. Meanwhile, the corrosion resistance of the substrate coated with the composite coating had been significantly improved. When the composite coating is scratched, the Ce ions might gradually release from the coating and convert into newly formed Ce-based compounds to prevent the further corrosion, exhibiting a self-healing behavior.
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Nanomaterials
·
2022
·Vol. 12
·期 6
·899
·
IF 5.719
Xiaoyan Wu,Wei Li,Qingrong Chen,Caixia Xu,Jiamian Wang,Lingyuan Wu,Guodong Liu,Weiping Wang,Ting Li,Ping Chen,Long Xu
Light-induced degradation (LID) phenomenon is commonly found in optoelectronics devices. Self-healing effect in halide lead perovskite solar cells was investigated since the electrons and holes in the shallow traps could escape easily at room temperature. However, the degradation in the semiconductors could not easily recover at room temperature, and many of them needed annealing at temperatures in the several hundreds, which was not friendly to the integrated optoelectronic semiconductor devices. To solve this problem, in this work, LID effect of photocurrent in p-type Mg-doped gallium nitride thin films was investigated, and deep defect and vacancy traps played a vital role in the LID and healing process. This work provides a contactless way to heal the photocurrent behavior to its initial level, which is desirable in integrated devices.Keywords:Mg-doped gallium nitride;light-induced degradation;photocurrent device;contactless healing
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Haodong Li,Haoyu Li,Zhiwei Yang,Yizhu Lai,Qing Yang,Pengxin Duan,Zhuo Zheng,Yang Liu,Yan Sun,Benhe Zhong,Zhenguo Wu,Xiaodong Guo
The application value of silicon-based anodes has not been fully realized due to the ∼ 300% volume expansion and poor electronic conductivity. In present study, mesoporous Si/C (MP-Si/C) composite with nanosized primary particles of 30–50 nm and pore diameter of 20–40 nm was proposed, which displays superior Li storage properties. Firstly, Polyacrylic acid (PAA) was applied to fulfill in-situ carbon coating and inhibit the particle growth of SiO 2 generated from tetraethyl orthosilicate (TEOS) in stöber reaction. Secondly, Mg gas was introduced to create nano-sized Si with meso -pores and three-dimensional carbon network via the gas-cutting effect. The cycling stability and rate capability were both significantly enhanced with capacity of 671 mAh/g after 400 cycles and 593 mAh/g after 500 cycles at 2 A/g and 4 A/g, respectively, which was highly relevant to the selection of carbon source PAA and its corresponding carbon coating and Mg reduction effect. Moreover, this method bypasses the use of costly nano-silicon, which provides inspiration for the commercialization of silicon-based anodes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Bingzhi Li,Li Wang,Yan Su,Ri Qiu,Zhaoqi Zhang,Yibo Ouyang
Corrosion susceptibility is a critical obstacle for Mg alloy usage in harsh environments. Bioinspired superhydrophobic surface (SHS) affords a new way to combat corrosion. However, problems, e.g., water vapor condensation and air dissolution, ceaselessly hurdle practical usage of SHS for long-term corrosion inhibition . In this report, targeting the corrosion inhibition of Mg alloy in seawater , a refreshable self-polishing superhydrophobic coating is bound onto AZ31 Mg alloy bridging via a ceramic/paraffin buffer layer to solve the two problems encountered by traditional SHS. Firstly, the liquid paraffin is injected into the porous ceramic structure constructed by micro-arc oxidation (MAO). Then, carbon soot (CS) is grown onto the ceramic/paraffin layer via a combustion method. The internal CS layer is firmly bonded due to the molten paraffin. Meanwhile, the external superhydrophobic CS layer is soft and floppy to perform self-polishing property under dynamic water flow condition. The refreshable feature endows the regeneration of SHS. Using water jet flush (5.8 m/s) and immersion test up to 168 h, Mg alloy covered ceramic layer and carbon soot (MMAO-CS) coating demonstrates excellent stability. Using diatoms as target organisms to illustrate seawater anti-biofouling property, a few diatoms are found on MMAO-CS even after immersion for 10 d due to the low modulus and self-polishing of the external superhydrophobic layer invaded by the water phase and bio-organisms. For prohibiting corrosion in seawater environment, MMAO-CS coating possesses prominent resistance with |Z| 0.01 Hz (2.82 ×10 7 Ω cm 2 ) of 6 orders of magnitude larger than bare AZ31 (42.9 Ω cm 2 ), enabling its potential usage in marine environment.
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Coatings
·
2021
·Vol. 11
·期 9
·1030
·
IF 2.881
Wanshun Zhang,Hongyang Zhao,Xiaodong Hu,Dongying Ju
The microstructure, electrical conductivity, and electromagnetic interference (EMI) shielding effectiveness (SE) of CNTs/Mg Matrix composites prepared by accumulative roll bonding (ARB) were systematically investigated to understand the effects of CNTs on the electromagnetic interference shielding effectiveness property of magnesium. A model based on the shielding of the electromagnetic plane wave was used to theoretically discuss the EMI shielding mechanisms of ARB-processed composites. The experimental results indicated that the methods were feasible to prepare laminated composites. The SE of the material increased gradually with the increase of electrophoretic deposition time. When the electrophoretic deposition time reached 8 min, the value of SE remained 87–95 dB in the frequency range of 8.2–12.4 GHz. The increase in SE was mainly attributed to the improvement in the reflection and multiple reflection losses of incident electromagnetic wave due to the increased amounts of CNTs and interfaces. The methods provided an efficient strategy to produce laminated metal matrix composites with high electromagnetic shielding properties.Keywords:carbon nanotubes;magnesium matrix composites;accumulative roll bonding;electromagnetic shielding property
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xiangcheng Shan,Liyu Yang,Yumeng Zhao,Huarong Yang,Zuoyi Xiao,Qingda An,Shangru Zhai
Recently, biochar-related phosphate sorbents have been extensively investigated and achieved significant progress; however, there is still much room for enhancement on capturing performance and recovery of powdery ones after sorption. Herein, a new kind of adsorbent, in which biochar/Mg-Al spinel encapsulated in carboxymethyl cellulose-La hydrogels with cationic polymeric layers, was fabricated, aiming for integrating multi-advantages of each component for enhanced phosphate capture. Batch static experiments were correlated to the phosphate adsorption performance of the adsorbent. The maximum phosphate adsorption capacity of the adsorbent was 89.65 mg P/g at pH = 3. The Langmuir isotherm model and the pseudo-second-order kinetic model fitted well with the adsorption behavior of the adsorbent. More importantly, this composite adsorbent that integrated with biochar, Mg-Al spinel, cationic polymeric components exhibited favorable selectivity over coexisting anions (Cl - , SO 4 2- , HCO 3 – and NO 3 – ) and performed good reusability after five consecutive cycles. By virtue of the bead-like feature, fixed-bed column experiments demonstrated that the Thomas model fitted the breakthrough curves well under varied experimental conditions. The adsorption mechanism of phosphate on the designed composite adsorbent with multi-components could be described as the electrostatic attraction, ligand exchange and inner-sphere complexation, which might account for the efficient phosphate capturing performance.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Wenjiang Huang,Di Mei,Junlong Zhang,Dongfang Chen,Jingan Li,Liguo Wang,Yifan Zhou,Shijie Zhu,Shaokang Guan
Severe and non-uniform degradation of magnesium (Mg) alloys limits their general application in the field of vascular stents . Polymer coatings , which have been widely used in biodegradable materials, can simultaneously reduce degradation and improve the biocompatibility of Mg alloys. In this study, polycaprolactone (PCL) coating was prepared on Mg–Zn–Y–Nd alloy by electrografting. The microstructure of the prepared coating is significantly influenced by current density and monomer concentration, according to scanning electron microscope/energy dispersive spectroscopy results. The electrografted PCL coating has two molecular weights , 15.5 × 10 3 g·mol −1 and 1.08 × 10 3 g·mol −1 , according to gel permeation chromatography results. Electrochemical and immersion tests show that the electrografted PCL coating has better anti-corrosion properties than the PCL coating prepared using the traditional dipping method. Meanwhile, human umbilical vein endothelial cells and smooth muscle cells culture results show that electrografted PCL coating improves the magnesium alloy’s ability to maintain cell viability . Furthermore, arginine-glycine-aspartic acid was fixed on the surface of the PCL coating to confirm the possibility of functionalisation of the electrografted PCL coating. The results show that the composite coating promotes cell adhesion.
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高影响因子
HYDROMETALLURGY
·
2021
·
IF 4.156
Luri Bao,Jingze Zhang,Jie Wu,Guotai Zhang,Yang Yang,Weiping Tang,Mei Xue
Owing to the increasing global demand for lithium, extraction of lithium from salt lake brine water has received considerable attention. In this study, the magnesium doping to produce Li 1.6 Mg x Mn 1.6-x O 4 (LMMO) was designed to overcome the limitation caused by the loss of Mn due to dissolution. The chemical and morphological properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The XRD results confirmed that the crystal structure of Li 1.6 Mn 1.6 O 4 was retained after Mg-doping. Scanning electron microscopy and energy-dispersive X-ray spectroscopy showed that LMMO has a flake-shaped structure and the Mg 2+ ions were uniformly distributed in the precursor. The doping of Mg 2+ led to the decrease of Mn 3+ content in the precursor, improving its structural stability. The adsorption capacity of LMMO-6% was 35.6 mg g −1 , which was greater than that of the undoped sample (33.2 mg g −1 ). After the tenth cycle, the dissolution loss of Mn in LMMO-6% was 0.55%, and it is smaller than that for lithium manganese oxide (0.94%). Results confirm that the structural stability was improved compared to undoped adsorbents. Moreover, batch adsorption experiments demonstrated the potential of the HMMO-6% adsorbent to be used for lithium adsorption from real salt lake brine.
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高影响因子
Journal of Magnesium and Alloys
·
2021
·
IF 10.088
Youwen Yang,Changfu Lu,Lida Shen,Zhenyu Zhao,Shuping Peng,Cijun Shuai
Biodegradable magnesium (Mg) and its alloy show huge potential as temporary bone substitute due to the favorable biocompatibility and mechanical compatibility. However, one issue deserves attention is the too fast degradation. In this work, mesoporous bioglass (MBG) with high pore volume (0.59 cc/g) and huge specific surface area (110.78 m 2 /g) was synthesized using improved sol-gel method, and introduced into Mg-based composite via laser additive manufacturing. Immersion tests showed that the incorporated MBG served as powerful adsorption sites, which promoted the in-situ deposition of apatite by successively adsorbing Ca 2+ and HPO 4 2− . Such dense apatite film acted as an efficient protection layer and enhanced the corrosion resistance of Mg matrix, which was proved by the electrochemical impedance spectroscopy measurements. Thereby, Mg based composite showed a significantly decreased degradation rate of 0.31 mm/year. Furthermore, MBG also improved the mechanical properties as well as cell behavior. This work highlighted the advantages of MBG in the fabrication of Mg-based implant with enhanced overall performance for orthopedic application.
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