ACS Applied Nano Materials
·
2022
·
IF 6.14
Lijing Zhang,Jiaqi Han,Yuchao Wang,Wenbo Yang,Shengyang Tao
Achieving a room-temperature Suzuki–Miyaura coupling (SMC) with high efficiency is of great significance to the development of low-carbon organic synthesis. Nevertheless, it is still a great challenge to construct a promising nanocatalyst with high activity for room-temperature SMC reaction. In this paper, a strong alkaline-supported nanocatalyst Pd/Mg(OH)2/MgO–ZrO2 was rationally developed based on MgO–ZrO2 hybrid nanofibers. Physicochemical characterizations present that the in situ conversion of MgO to Mg(OH)2 on the surface of the nanofibers results in a great increase in surface alkalinity of the carrier. The strong alkalinity can greatly accelerate the oxidation addition and transmetalation of the SMC process, resulting in the obvious reduction of activation energy of the reaction (Ea = 9.0 kJmol–1 for Ph–Br). The coupling conversion can reach up to 100% at room temperature within 8 min with a maximum TOF > 6516 h–1. It also shows an excellent performance in substrate applicability and chlorobenzene activation. The rational design of a high-basicity catalyst for room-temperature SMC will be a rewarding attempt for the development of low-carbon green organic synthesis.
研究领域:
催化化学
·
有机合成
·
纳米材料科学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Chang Peng,Ming-Zhu Pan,Jia-Min Wu,Jin-Feng Yan,Qian-Xun Liu,Xiao-Yan Zhang,Xiu-Mei Wang,Yu-Sheng Shi
Bone defects resulting from bone tumor resections are often complicated with residual cancer cells. To address the challenge, the magnetothermal porous structured bone scaffolds of hydroxyapatite-Fe 3 O 4 -MgO (HA-FM) were fabricated by Vat Photopolymerization (VPP). This study improved curing behavior by doping Mg(OH) 2 into Fe 3 O 4 powder via the chemical deposition method. Mg(OH) 2 functioned as a pore-forming agent during the sintering process, decomposing into MgO to enhance biocompatibility. A two-step debinding method combined with a carbon powder embedding sintering process was used employed to resolve the conflict between the removal of photosensitive resin and the oxidation of Fe 3 O 4 . After sintering at 1200°C, the porosity of the composite ceramics reached 69% and a compressive strength of 2.28 MPa. In vitro mineralization tests showed that doping with Fe 3 O 4 and Mg(OH) 2 could promote the scaffolds’ degradation in simulated body fluid (SBF), beneficial to mineralization process. In vitro cell proliferation and adhesion experiments showed that ceramic samples were not cytotoxic and could promote osteogenic differentiation. The composite scaffolds exhibited magnetothermal properties, achieving a temperature increase of 8.2°C in the alternating magnetic field of 92 G and 100 kHz, indicating potential for cancer treatment.
研究领域:
材料科学
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生物医学工程
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癌症治疗
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生物材料
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组织工程
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 31
·2204155
·
IF 19.924
Pengjian Wang,Yan Guo,Di Zhou,Da Li,Lixia Pang,Wenfeng Liu,Jinzhan Su,Zhongqi Shi,Shikuan Sun
High-temperature performance is critical to the dielectric polymer capacitors used in environment electronic and high-power applications. Here, the authors report a composite comprising polyimide (PI) dielectric polymers blended with high-insulation magnesium oxide (MgO) nano-filler that exhibits high breakdown strength, wide temperature range, and low dielectric loss. However, most dielectric polymers possess excellent energy storage properties at room temperature and cannot be used at high temperatures above 100 °C. Polyimide dielectric nanocomposites prepared by in situ polymerization, which are composed of easily prepared MgO fillers, have different morphologies, such as nanoparticles (0D), nanowires (1D), and nanoplates (2D). The experimental results show that the insulation behavior and breakdown strength of polymer composites are closely related to the morphology of MgO fillers, and the rationality of this conclusion is further proved by finite-element simulation results. The polymer composites containing ultra-low content (0.5 vol%) MgO nanosheets produce an ultra-high capacitance performance, that is, the discharge energy density is 4.78 J cm −3 at 150 °C, which is significantly better than the most reported dielectric polymers and nanocomposites.
研究领域:
材料科学
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电气工程
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纳米技术
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Xiongfang An,Xiaolin Xu,Weijie Guo,Zepu Chen,Zhiyin Miao,Jiayi Yuan,Zhansheng Wu
Significant progress has been made in the development of phosphorus recovery adsorbents and photocatalysts for degradation of pesticides. However, the bifunctional materials for phosphorus recovery and photocatalytic degradation of pesticides have not been designed, and the mechanism of the interaction between photocatalysis and P adsorption remains unexplored. Herein, we develop biochar-g-C 3 N 4 -MgO composites (BC-g-C 3 N 4 -MgO) with bi-function application to minimize water toxicity and eutrophication. The results show phosphorus adsorption capacity of the BC-g-C 3 N 4 -MgO composite reaches 111.0 mg·g-1, and its degradation ratio of dinotefuran reaches 80.1% within 260 min. The mechanism studies show that MgO can play variety roles in BC-g-C 3 N 4 -MgO composite, in which can improve the adsorption capacity of phosphorus, enhance the utilization efficiency of visible light and the separation efficiency of photoinduced electron-hole pairs. The biochar existed in BC-g-C 3 N 4 -MgO serves as charge transporter with a good conductivity, which promotes the fluent transfer of photo-generated charge carriers. The ESR indicates that both • O 2 − and •OH generated from BC-g-C 3 N 4 -MgO are responsible for dinotefuran degradation. Finally, pot experiments reveal that P laden BC-g-C 3 N 4 -MgO promotes the growth of pepper seedlings with high P utilization efficiency of 49.27%.
研究领域:
环境科学
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材料科学
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农业
·
化学
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产品关联
DOI
PubMed
高影响因子
Regenerative Biomaterials
·
2024
·
IF 5.6
Zhou Tao,Chen Yedan,Fu Liangmin,Wang Shan,Ding Haihu,Bai Qiaosheng,Guan Jingjing,Mao Yingji
Owing to the unpredictable size of wounds and irregular edges formed by trauma, nanofibers' highly customizable and adherent in situ deposition can contribute to intervention in the healing process. However, electrospinning is limited by the constraints of conventional polymeric materials despite its potential for anti-inflammatory and antimicrobial properties. Here, inspired by the Janus structure and biochemistry of nanometal ions, we developed an in situ sprayed electrospinning method to overcome bacterial infections and immune imbalances during wound healing. The bilayer fiber scaffold has a hydrophobic outer layer composed of polycaprolactone (PCL) and a hydrophilic inner layer composed of gelatin, poly (L-lactic acid) (PLLA), and magnesium oxide nanoparticles (MgO NPs), constituting the PCL/PLLA-Gelatin-MgO (PPGM) electrospun scaffold. This electrospun scaffold blocked the colonization and growth of bacteria and remained stable on the wound for continuous anti-inflammatory properties to promote wound healing. Furthermore, PPGM electrospinning modulated collagen deposition and the inflammatory microenvironment in the full-thickness skin model, significantly accelerating vascularization and epithelialization progression. This personalized Janus electrospun scaffold has excellent potential as a new type of wound dressing for first aid and wound healthcare.
研究领域:
生物医学工程
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材料科学
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伤口愈合
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纳米技术
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组织工程
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产品关联
DOI
PubMed
高影响因子
Materials Today Bio
·
2022
·
IF 10.761
Xi He,Wenbin Liu,Yanling Liu,Kai Zhang,Yan Sun,Pengfei Lei,Yihe Hu
Bone nonunion or delayed union, caused by stripping or injuring of periosteum, is the most common sequelae of segmental bone defects. The preservation of periosteum, or the use of periosteal grafts, can significantly improve the integration of bone graft, speeding up the process of bone reconstruction. However, in most cases, periosteum cannot be preserved with bioactivity. Thus, it is pivotal to develop artificial periosteum. In this study, artificial periosteum of PLGA/MgO/Quercetin was prepared by electrospinning. PLGA/MgO/Quercetin membranes were shown to have a highly porous surface and microstructure, as observed by scanning electron microscopy. Along with excellent biocompatibility, PLGA/MgO/Quercetin membranes promoted cell proliferation and migration, as well as osteogenic differentiation of BMSCs (Bone marrow mesenchymal stem cells) in a dose-dependent manner through the activation of Wnt/β-Catenin pathway. The PLGA/MgO/Quercetin membranes, with an appropriate concentration of quercetin (<1 wt%), promoted EPCs (Endothelial progenitor cells) angiogenesis. In a subcutaneous implantation model and rat skull defect model, optimal osteogenesis and angiogenesis function were observed for the PLGA/20 wt% MgO/0.1 wt% Quercetin membrane. In conclusion, PLGA/MgO membranes, with an appropriate concentration of quercetin, show a variety of biological activities and are promising materials for the generation of artificial periosteum.
研究领域:
生物医学工程
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组织工程
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骨科
·
再生医学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Qiyun Zhang,Ting Cheng,Qilang Lin,Changqing Fang
This study developed a facile approach for the fabrication of dual MgO-loaded carbon foam (DMCF) via carbonization of a cured MgO/cyanate ester resin mixture, which underwent self-foaming of the resin followed by the carbothermal reduction of MgO . The features of the prepared DMCF prepared were characterized by FESEM, TEM, XRD , FTIR, XPS and so on, and the effects of adsorption conditions, adsorption isotherms, kinetics, and thermodynamics on malachite green (MG) removal using the DMCF as adsorbents were investigated through batch adsorption experiments. Results demonstrate that the DMCF possesses a unique dual loading of MgO particles which are not only loaded onto its foam walls but also filled within the walls with a graphene-wrapped core-shell structure. The experimental maximum adsorption capacity of MG reaches up to 1874.18 mg/g with a partition coefficient of 10.87 mg/g/μM. The adsorption process can be better described with Langmuir, pseudo-second-order, and intraparticle diffusion models. Moreover, the DMCF exhibits a removal percentage of 84.85% after five reuses, indicating that it is an efficient and promising adsorbent for MG adsorption.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 9
·期 4
·1107-1122
·
IF 5.344
Rui Chen,Hang-Bo Chen,Peng-Peng Xue,Wai-Geng Yang,Lan-Zi Luo,Meng-Qi Tong,Bin Zhong,He-Lin Xu,Ying-Zheng Zhao,Jian-Dong Yuan
Bone repair and regeneration processes are markedly impaired in diabetes mellitus (DM). Intervening approaches similar to those developed for normal healing conditions have been adopted to combat DM-associated bone regeneration. However, limited outcomes were achieved for these approaches. Hence, together with osteoconductive hydroxyapatite (HA) nanocrystals, osteoinductive magnesium oxide (MgO) nanocrystals were uniformly mounted into the network matrix of an organic hydrogel composed of cysteine-modified γ-polyglutamic acid (PGA-Cys) to construct a hybrid and rough hydrogel scaffold. It was hypothesized that the HA/MgO nanocrystal hybrid hydrogel (HA/MgO-H) scaffold can significantly promote bone repair in DM rats via the controlled release of Mg2+. The HA/MgO-H scaffold exhibited a sponge-like morphology with porous 3D networks inside it and displayed higher mechanical strength than a PGA-Cys scaffold. Meanwhile, the HA/MgO-H scaffold gradually formed a tough hydrogel with G′ of more than 1000 Pa after hydration, and its high hydration swelling ratio was still retained. Moreover, after the chemical degradation of the dispersed MgO nanocrystals, slow release of Mg2+ from the hydrogel matrix was achieved for up to 8 weeks because of the chelation between Mg2+ and the carboxyl groups of PGA-Cys. In vitro cell studies showed that the HA/MgO-H scaffold could not only effectively promote the migration and proliferation of BMSCs but could also induce osteogenic differentiation. Moreover, in the 8th week after implanting the HA/MgO-H scaffold into femur bone defect zones of DM rats, more effective bone repair was presented by micro-CT imaging. The bone mineral density (397.22 ± 16.36 mg cm−3), trabecular thickness (0.48 ± 0.07 mm), and bone tissue volume/total tissue volume (79.37 ± 7.96%) in the HA/MgO-H group were significantly higher than those in the other groups. Moreover, higher expression of COL-I and OCN after treatment with HA/MgO-H was also displayed. The bone repair mechanism of the HA/MgO-H scaffold was highly associated with reduced infiltration of pro-inflammatory macrophages (CD80+) and higher angiogenesis (CD31+). Collectively, the HA/MgO-H scaffold without the usage of bioactive factors may be a promising biomaterial to accelerate bone defect healing under diabetes mellitus.
研究领域:
生物材料
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组织工程
·
生物医学工程
·
骨科
·
糖尿病研究
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Boxin Zhang,Jiexuan Jiang,Xiang Lu,Yunting Hou,Xiaobo He,Yixuan Lv,Xin Peng,Shanna Xu
The MgO-CaO-SiO 2 (MCS) glass system is widely studied due to its applications in various industries, including construction, electronics, and biomedical applications. Although glass materials are known to potentially possess simultaneously corrosion resistance, a relatively high mechanical strength, and an adjustable thermal expansion coefficient, achieving high performance in this glass system remains a long-standing challenge. Herein, we systematically investigated the effects of changes in the CaO/MgO ratio on the structure and properties of the glass, using MCS multicomponent amorphous glass as the target. The results show that with the increase of MgO content, the glass is gradually transformed from a loose network to a dense network, which is manifested by the evolution of Tg and network rigidity, the decreasing trend of CTE, and the redistribution of Q n structural units, BO/NBO ratio, and the local structural relaxation behavior of the glass network skeleton. Moreover, Ca 2+ and Mg 2+ exert both synergistic and competitive effects on the amorphous network structure, thereby significantly enhancing the visible light transmittance, mechanical properties, and chemical stability of the glass. This study not only reveals the mechanism of CaO/MgO double alkaline earth ions in silicate amorphous systems, but also provides a new idea and experimental basis for realizing the precise regulation of glass structure-properties through the design of ion ratios.
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 9
·5382-5391
·
IF 3.502
Yujing Wei,Shijia Gu,Hailiang Fang,Wei Luo,Xin Zhang,Lianjun Wang,Wan Jiang
Transparent MgO ceramics are successful fabricated via spark plasma sintering at lower temperature using the high sintering activity powders synthesized by precipitated method. The samples were detected by XRD, SEM, TEM, BET, UV-Vis-NIR, microhardness, and so on. The results show that all ceramics prepared at 700°C-900°C are visually transparent and the sample sintered at 860°C for 5 min exhibits the superior transmittance of 60% (800 nm). It is also found that the mechanical and thermal properties of MgO ceramics are all increasing firstly and then decreasing with the increase in the sintering temperature. And the maximum value of hardness, fracture toughness, MSP strength, and Young's modulus of MgO ceramics is 8.25 GPa, 2.01 MPa·m 1/2 , 206 MPa, and 286 GPa, respectively. Moreover, the thermal conductivity of MgO ceramics sintered at 860°C can reach 48.4 W/mK at room temperature.
研究领域:
材料科学
·
陶瓷
·
光学材料
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热学性能
·
机械工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 1
·149-157
·
IF 14.511
Yingfei Hu,Jun Wang,Huiting Huang,Jianyong Feng,Wangxi Liu,Hangmin Guan,Lingyun Hao,Zhaosheng Li,Zhigang Zou
Passivating surface traps plays a crucial role in mitigating the efficiency loss of solar water-splitting electrodes. However, the associated surface-trap passivation approaches require the introduction of an overlayer, complicating the fabrication process and increasing the capital cost of photoelectrodes. Herein, using CuBi2O4 as a prototype, an in situ surface-trap passivation strategy is developed, which yields a beneficial 90 mV anodic shift in hydrogen-evolution onset. Detailed mechanism investigations prove that the intentionally added Mg2+ ions in the precursor gradually segregate as MgO and enrich at the grain boundaries/surface of the CuBi2O4 multicrystalline, porous film during annealing, via which surface traps stemming from dangling bonds are spontaneously passivated; measurements of photovoltage generation characteristics and carrier lifetime validate the favorable roles of the MgO passivator in CuBi2O4 photocathodes. A bias-free water-splitting device is assembled using MgO-passivated CuBi2O4 and Mo-doped BiVO4 as the photocathode and photoanode respectively in a tandem configuration, delivering a solar-to-hydrogen conversion efficiency of approximately 0.41%.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
CHEMPHYSCHEM
·
2015
·Vol. 16
·期 8
·1727-1732
·
IF 3.419
Xudong Guo,Haopeng Dong,Wenzhe Li,Nan Li,Liduo Wang
Graphical The great cover-up: A multifunctional magnesium oxide (MgO) layer is successfully introduced into perovskite solar cells (PSCs) to enhance the performance of the cells. A multifunctional magnesium oxide (MgO) layer was successfully introduced into perovskite solar cells (PSCs) to enhance their performance. MgO was coated onto the surface of mesoporous TiO 2 by the decomposition of magnesium acetate and, therefore, could block contact between the perovskite and TiO 2 . X-ray photoelectron spectroscopy and infrared spectroscopy showed that the amount of H 2 O/hydroxyl absorbed on the TiO 2 decreased after MgO modification. The UV/Vis absorption spectra of the perovskite with MgO modification revealed an enhanced photoelectric performance compared with that of unmodified perovskite after UV illumination. In addition to the photocurrent, the photovoltage and fill factor also showed an enhancement after modification, which resulted in an increase in the overall efficiency of the cell from 9.6 to 13.9 %. Electrochemical impedance spectroscopy (EIS) confirmed that MgO acts as an insulating layer to reduce charge recombination.
研究领域:
材料科学
·
光伏技术
·
纳米技术
·
能源工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）