Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 20
·9723-9732
·
IF 8.867
Jiaguang Zheng,Xuezhang Xiao,Liuting Zhang,Shouquan Li,Hongwei Ge,Lixin Chen
A remarkable improvement in the hydrogen desorption performance of Mg(BH4)2–NaBH4 eutectic composite is achieved by simply ball-milling with fluorographene (FG). It is found that the desorption temperature of Mg(BH4)2–NaBH4 (∼200 °C) is still too high and liquid phase appears during dehydrogenation. Particularly, the novel bowl-like 3D Mg(BH4)2–NaBH4–FG composite can be formed after ball-milling. The novel Mg(BH4)2–NaBH4–FG exhibits a low dehydrogenation temperature of 114.9 °C with 6.9 wt% of pure hydrogen in seconds. In-depth investigations show that such greatly improved hydrogen desorption properties of the Mg(BH4)2–NaBH4–FG composite could be ascribed to both the “novel bowl-like 3D structure” with large specific surface area and the “reactant destabilized modification” owing to the decrease of the reaction enthalpy caused by the formation of NaMgF3. This finding provides a facile preparation of complex borohydride composites with low dehydrogenation temperature and fast rate, which accelerates its practical application in fuel cells.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ruixin Yan,Xiuping Feng,Long Kong,Qun Wan,Weilin Zheng,Takeshi Hagio,Ryoichi Ichino,Xinde Cao,Liang Li
Hexavalent Chromium (Cr(VI)) in water is a public health concern and has been a challenging research subject in environmental field for many years. Herein, a novel composite material consisting of amorphous iron sulfides supported on hydrotalcites (FeS/HTs) was synthesized by “calcination-reconstruction-calcination” process, which enables homogeneous distribution of iron and sulfur on the surface of hydrotalcites (HT). The composite (mass ratio of FeS/HT was 1/2) could effectively remove over 98% of Cr(VI) within 10 min. A pseudo-second-order kinetic model and a Langmuir isotherm model were well fitted the sorption data with a maximum removal capacity of 206.2 mg/g. The superior adsorption capacity of FeS/HTs could be attributed to the combination of the advantages of abundant adsorption sites on HT and powerful reduction properties of iron sulfides. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis suggested the adsorbed Cr(VI) on the surface and interlayer of FeS/HTs had been reduced to Cr(III) by reductant iron and sulfur. This study demonstrated that FeS/HTs has potential application prospects in Cr(VI) removal.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yao Lu,Carlos Alberto López,Jie Wang,José Antonio Alonso,Chunwen Sun
Na 0.5 Bi 0.5 TiO 3 (NBT) and its acceptor-doped perovskites , as lead-free piezoelectric materials before, have been found to be excellent oxygen-ion conductors with potential applications in intermediate-temperature solid oxide fuel cells (SOFCs). Among them, the Bi deficient and B-site Mg doped sodium bismuth titanate (Na 0.5 Bi 0.49 Ti 0.98 Mg 0.02 O 2.965 , NBTM) exhibits a remarkable oxygen ionic conductivity . Here, we report a structural analysis on NBT and NBTM ceramics using high-temperature in situ neutron diffraction (NPD) to gain insight into the effects of Mg doping on ionic conductivity and structure. Both perovskite oxides exhibit two consecutive phase transformations from R 3 c to P 4 bm at ∼400 °C and from P 4 bm to Pm 3 ¯ m at ∼600 °C. The effects of Bi deficiency and Mg substitution on oxygen vacancy concentration and ion displacements are revealed. In addition, a NBTM supported single cell consisting of Ag-NBTM cathode and Ni-NBTM anode is fabricated to evaluate the possibility of its application in intermediate-temperature SOFCs. The structural stability of NBTM is still a major concern that hinders its utilization at high temperature and under reducing atmosphere.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yan Zhao,Pengjun Zhao,Qing Zhao,Donglin He,Wenwen Kong,Bing Wu,Aimin Chang
Herein, Mg–Al–Si–Ba–O-based glass ceramics were studied as potential candidates to protect Mn–Co–Ni–O-based negative temperature coefficient (NTC) thermistors at high temperatures such as 900 °C. The ceramics were prepared in three glass formulations (1#: 15MgO–15Al 2 O 3 -44.7SiO 2 –25BaO, 2#: 17MgO–17Al 2 O 3 –41SiO 2 –25BaO and 3#: 17MgO–17Al 2 O 3 –41SiO 2 –20BaO–5Y 2 O 3 (in mol%)) and their glass-transition temperatures ( T g ) were determined using the differential scanning calorimetry (DSC) method. Scanning electronic microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the parent glasses and glass-ceramic coatings. The sealing effects of the glass ceramics were examined by conducting an insulation test. The glass-ceramic sealing structures were subjected to 1000 thermal shock cycles at temperatures varying from room temperature to 900 °C. Notably, the sealing structure of glass-ceramic coating 1# was compact at a T g of 760.9 °C. The glass-ceramic coatings effectively maintained the NTC properties of the sensitive ceramics in all three formulations. Interestingly, the glass-ceramic coating 3# containing Y 2 O 3 demonstrated an increase in electrical resistance. Both the NTC thermistors coated with 1# and 2# glass formulations successfully passed 1000 thermal shock cycles without visible failures, and their resistance change ratios were well below the requisite 20%.
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Journal of Energy Storage
·
2022
·
IF 8.907
Hui Wang,Enda Ci,Xiaoqing Li,Ying Zhang,Zhenying Zhang,Jianqiang Li
A new eutectic mixture phase change material containing magnesium nitrate hexahydrate and lithium nitrate has been successfully prepared, which can be applied in the field of residential radiator heating due to the suitable phase change temperature and high latent heat. Further, by physical blending magnesium nitrate hexahydrate/lithium nitrate eutectic mixtures and expanded graphite, the new composites were prepared. The crystalline structure, thermal properties, corrosion performance of eutectic phase change materials were systematically measured. The results showed that the best eutectic mixtures had a phase change temperature of 72.35 °C and latent heat of 170.32 kJ/kg, with a little supercooling degree. The thermal conductivity was effectively improved by adding expanded graphite. Meanwhile, corrosion tests suggested aluminum and stainless steel 304 could be the preferred choices as the container. Overall, the prepared eutectic composite materials with superior performances could be a promising candidate for the residential radiator heating field.
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Materials Today Communications
·
2024
·
IF 3.7
Yang Liu,Run Liu,Wenxian Nie,Leiting Yu,Shaoyuan Lyu,Qi Han,Yun Zhao,Minfang Chen
In this study, a composite coating of polycaprolactone layer and polydopamine-cyclodextrin (β-CD)/naringenin (NG) was prepared on the surface of a micro-arc oxidized (MAO) pretreated magnesium alloy by a two-step method. The findings demonstrate that the composite coating exhibits favorable corrosion resistance, biocompatibility, photo-thermal antimicrobial, and bone-enhancing characteristics. Compared with the MAO coating, the corrosion rate of the composite coating was significantly reduced from about 0.087 mm/y to 0.066 mm/y. The antimicrobial efficiency of the coating against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) under 808 nm laser irradiation was found to reach 93 % and 99 %, respectively. Furthermore, in vitro cytotoxicity assays, dead and live cell staining, and immunoblotting analysis showed that the coating exhibited favorable biocompatibility and osteogenic activity. This novel coating may have good application prospects in the treatment of osteoporosis-related fractures.
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Advanced Healthcare Materials
·
2026
·
IF 11
Douhui Guo,Jing Ye,Changxiong Cai,Ting Xiong,Xueqiang Deng,Yaqi Hua,Wenqi Duan,Chen Li,Liang Hao
Rotator cuff tears (RCT) are one of the most common causes of shoulder joint pain and mobility disorders affecting the health of middle-aged and elderly patients. Although the arthroscopic repair can effectively suture the torn rotator cuff, the retear rate is still high, especially for patients with osteoporosis. Excessive oxidative stress, uncontrolled inflammatory infiltration Bone mass reduction, muscle atrophy, and fatty infiltration would gradually aggravate during the development of RCT, which would seriously hinder the effective repair of the repaired rotator cuff after arthroscopic surgery. Herein, a novel nanozyme-based drug delivery system Nb 2 C@Mg-MOF/Pluronic F127 (NMP) consisting of niobium carbide (Nb 2 C), magnesium metal–organic framework (Mg-MOF), and a temperature-sensitive hydrogel (Pluronic F127) was developed for effective regulation of inflammation and orderly regeneration of various tissues from bone to muscle. The in vitro and in vivo studies have shown that NM (Nb 2 C@Mg-MOF) has excellent anti-inflammatory properties. It could actively promote various tissue regeneration, including osteogenesis, inhibition of osteoclastogenesis, myogenesis, inhibit fatty infiltration and angiogenesis. This nanozyme-based drug delivery system plays an effective role in promoting healing in the complex repair process of rotator cuff tears with osteoporosis, which would provide new insights and a promising strategy for treating of osteoporotic rotator cuff tears.
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PubMed
高影响因子
Applied Materials Today
·
2026
·
IF 6.9
Jingguang Wang,Zhenze Xie,Nantian Duan,Tao Wang,Chang Du
Repairing critical-sized bone defects, particularly those with irregular geometries, remains a significant clinical challenge. Stem cell-derived exosomes have been shown to promote bone defect repair. However, effective encapsulation and delivery of exosomes are still not well solved. To address this, we developed a composite bioink by encapsulating exosomes within a Pickering emulsion system (Water in oil. Water phase: MgO/exosomes; Oil phase: hydroxyapatite/silica/Poly (D, L-lactide-co-trimethylene carbonate)). This bioink was used to fabricate an exosome-laden MgO composite scaffold (PHS/MgO-EXO) via 3D printing. The PHS/MgO-EXO scaffold featured an excellent hierarchical interconnecting porous structure, capable of sustained release of Mg²⁺ ions and exosomes, which collectively promoted cell proliferation, adhesion, and osteogenic differentiation. Notably, the scaffold exhibited an excellent shape memory effect, enabling it to achieve conformal fitting and repair of irregular defects upon external stimulation. Moreover, the PHS/MgO-EXO scaffold could promote the repair and regeneration of bone defect in rat skull defect experiment. Transcriptome analyses revealed the mechanism: the PHS/MgO-EXO scaffold regulated the osteogenic differentiation of mBMSCs through the Hippo signaling pathways, and promoted tissue regeneration by modulating the immune response through the TNF-α and IL-17 pathways. Taken together, this PHS/MgO-EXO scaffold with shape memory properties can release exosomes and sustain the release of Mg²⁺ ions, which will provide a highly promising strategy for clinical repair of irregular bone defects.
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CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 24
·52228-52239
·
IF 5.1
Dongjiang Wu,Weijie Lv,Zheng Li,Xuexin Yu,Cong Zhou,Bi Zhang,Wei Wang,Huanyue Zhang,Guangyi Ma,Fangyong Niu
High-entropy oxides (HEOs) have attracted extensive research interest due to their unique structural features, customizable elemental compositions, and tunable functional properties. Nevertheless, the complexity, low efficiency, and high cost of the existing HEO synthesis methods place limitations on them. In this study, Laser directed energy deposition (LDED) was employed to synthesize (Mg, Co, Ni, Cu, Zn)O oxides. Additionally, the novelty of applying the LDED process to multicationic systems was emphasized. The comparison between specimens fabricated from mixed powder via LDED(MP) and those fabricated from pre-sintered powder via LDED(SP) encompasses macroscopic morphology, microstructure, and performance. The results showed that SP significantly enhanced the density from 86.44 % to 96.70 % compared to MP. The macro-segregation of Cu and Cu 2 O in the phase composition was observed in MP and SP. High-temperature pre-sintering promoted the solid solution formation of Co and Ni during LDED, leading to more severe micro-segregation of Co and Ni. When employed as anodes in lithium-ion batteries, MP and SP have outstanding long-term cycle stability, according to electrochemical performance studies. At a current density of 100 mAg −1 , these specimens maintained a capacity retention rate of 100 % even after 200 cycles. The initial discharge capacities of MP and SP were respectively 477.73 mAh g −1 and 373.86 mAh g −1 . This study is expected to present a novel approach for the rapid synthesis of (Mg, Co, Ni, Cu, Zn)O oxide ceramics .
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CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Kaibin Li,Jie Li,Ning Zhang,Xiaolong Gu,Ying Tang,Liang Fang
High-entropy Mg(Mg 0.25 Zn 0.25 Ga 0.5 Ti 0.5 Al 0.5 )O 4 ceramics with disordered spinel structure were prepared at 1420-1500 °C. When sintered at 1480 °C, Mg(Mg 0.25 Zn 0.25 Ga 0.5 Ti 0.5 Al 0.5 )O 4 ceramics exhibited extremely high Q×f of 105,800 ± 300 GHz, improved τ f of –45.3 ± 0.01 ppm/°C, and low ε r of 11.5 ± 0.1, with favorable H v and flexural strength of 11.43 ± 0.01 GPa and 128.1 ± 0.1 MPa, respectively, which were 23.3% and 31.7% higher than those of MgAl 2 O 4 . The measured ε r of Mg(Mg 0.25 Zn 0.25 Ga 0.5 Ti 0.5 Al 0.5 )O 4 ceramics was substantially higher than the calculated εᵣ (C-M) (9.9), due to the underestimated Ti 4+ polarizability and rattling effect. The improved τ f was caused by the decreased τ ε and increased Gibbs free energy. The 1.5 times increase in Q × f stemmed from the increased packing fraction and lattice energy, lowered σ AC , enhanced E a and covalency factor. A cylindrical dielectric resonator antenna was designed with Mg(Mg 0.25 Zn 0.25 Ga 0.5 Ti 0.5 Al 0.5 )O 4 high-entropy ceramic, which can fulfill the communication demands of high-frequency and high-power applications.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2026
·
IF 16.8
Zhaoqi Zhang,Qian Ji,Hongfei Zhang,Heng Liu,Lei Zhao,Mengna Zhang,Lu Chen,Qian Li,Shaokang Guan
Poly(TA-Arg) coating with self-supplying NO fabricated via ethanol-water system. • Poly(TA-Arg) sample possesses a low degradation rate. • HA@CS nanoparticles synthesized with optimal HA:CS ratio. • HA@CS sample promotes endothelialization via PI3K-Akt-eNOS and Nrf2 pathways. Rapid degradation and inadequate re-endothelialization hinder the clinical application of biodegradable magnesium (Mg) alloy stents, while thrombosis and bacterial colonization further compromise early implant performance. To address these challenges, a hierarchical bilayer coating, consisting of an inner poly(α-thioctic acid)-L-arginine (Poly(TA-Arg)) layer and an outer hyaluronic acid/chitosan (HA@CS) nanoparticle layer (particle size, ∼240 nm), was fabricated on a fluorinated ZE21B Mg alloy. The Poly(TA-Arg) layer supported endothelial cell (EC)-mediated endogenous nitric oxide (NO) production. It also provided strong interfacial adhesion and corrosion protection, reducing the corrosion current density to 5.60 × 10 −8 A cm −2 . The HA@CS layer exhibited antioxidant activity, prolonged clotting time, low hemolysis, and > 99% antibacterial efficacy, as determined by plate counting. The bilayer coating promoted EC proliferation while inhibiting smooth muscle cell growth. RNA sequencing suggested that the pro-endothelialization effect was associated with PI3K-Akt- endothelial nitric oxide synthase-related signaling and an Nrf2-related antioxidant response. In a rat abdominal aorta model, the coated wire was surrounded by a thin, well-organized neointima with endothelial coverage, minimal inflammation, and no evident thrombosis. No obvious histopathological abnormalities were observed in major organs, and hematological parameters remained within normal ranges. This multifunctional coating provides a potential strategy for improving the vascular compatibility of biodegradable Mg stents. Download: Download high-res image (332KB) Download: Download full-size image
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124082
·
IF 7.5
Yanjuan Zhang,Yadong Ning,Yu Wang,Zhanhe Zhang,Zhengyan Liu,Zhihui Yu,Jingkui Qu
Continuous Mg 2+ accumulation during hydrochloric acid leaching of nickel laterite ore causes magnesium loss and increases the burden of saline wastewater treatment. In this study, magnesium was recovered from Mg-rich leachate as reactive MgO by precipitation using milk of lime followed by calcination. Simulated MgCl 2 -rich solutions revealed the concentration-dependent precipitation behavior. At low Mg 2+ concentrations, Mg(OH) 2 formed mainly through direct precipitation and produced dense lamellar precursors. At Mg 2+ concentrations of 30 g/L and above, CaMg 2 Cl 6 ·12 H 2 O was detected as a transient chloride-containing double salt during the early precipitation stage, and honeycomb-like porous Mg(OH) 2 precursors were obtained after washing. Calcination of the precursor produced MgO with improved citric acid activity (CAA). The optimized process was validated using purified Mg-rich leachate, achieving a stoichiometry-based Mg precipitation efficiency of 95.47% and producing MgO with approximately 98 wt% purity. The synthesized MgO showed CAA of 22.52 ± 1.19 s, a specific surface area of 60.75 m 2 /g, and Fe removal performance comparable to commercial MgO, supporting its potential internal reuse as a pH adjustment reagent in hydrochloric acid leaching processes.
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