COMPOSITES COMMUNICATIONS
·
2022
·
IF 7.685
Rongxia Zhao,Zhanyong Zhao,Peikang Bai,Wenbo Du,Di Tie,Zhen Zhang,Liqing Wang,Yu Wang
Magnesium-coated graphene (GNPs) was successfully prepared by a novel organic chemical reduction method with significantly improved wettability and dispersion. The GNPs were uniformly distributed in the matrix, while a finer and more dispersed strengthening phase β-Mg 17 Al 12 was precipitated around it. Moreover, MgO nanoparticles were formed by in-situ reaction on the surface of GNPs, forming nano-scale contact and tight interfacial bonding with the substrate, thereby significantly improving the wear resistance of the composites. The wear mechanism has also changed from severe delamination and abrasive wear to mixed wear of slight delamination , adhesion, and oxidation . The increase in wear resistance is attributed to the combined effect of the lubrication and load transfer of GNPs, the enhanced effect of fine precipitates on the mechanical properties of the matrix, and the synergistic effect of in situ generated MgO nanoparticles against deformation.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2017
·
IF 4.873
Jingxin Zhang,Zhongjie Du,Wei Zou,Hangquan Li,Chen Zhang
A magnesium oxide (MgO) nanoparticles-decorated carbon fiber hybrid (CF MgO) were designed and fabricated as thermal conductive but electric insulating filler for polymer matrix . Carbon fibers (CF) and MgO nanoparticles were firstly treated by the coupling agents with amine groups and epoxy groups , respectively. Then CF MgO was constructed through grafting the nanoparticles onto the surface of the fiber. It was expected that the thermal conductivity of CF would be enhanced but its electrical conductivity would be inhibited by the coating of MgO nanoparticles. The chemical structure and morphology of CF MgO were investigated using Fourier transform infrared spectrometer (FT-IR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM). Finally, the hybrid filler was introduced into Nylon 6. The strong interfacial interaction between the filler and matrix was exhibited, attributed to the existence of the coupling agents and the rough surface of nanoparticles-decorated CF. The highest thermal conductivity reached 0.748 W/m·K at 20 wt % addition of CF MgO. Meanwhile, the insulation of the composite appeared at higher than 10 wt% addition of the hybrid filler. Furthermore, connected by MgO nanoparticles, less CF was necessary for the construction of heat conduction channel, and lower value of percolation threshold was achieved.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Zhuxiu Zhang,Yue Xiao,Yifan Lei,Jihai Tang,Xu Qiao
The antibiotics abuse and the proliferation of antibiotic-resistant bacteria in the environment have a severe impact on both human health and ecosystem. In this study, a silica-nanocasting method was applied in Mg-MOF-74 template to generate a series of MgO/SiO 2 catalysts for the hydrolysis of β-lactam antibiotics. The Mg-based subunits in MOF-74 were converted to highly dispersed MgO nanoparticles with controllable particle size. MgO/SiO 2 -80 with the smallest MgO particle size exhibits the best catalytic performance in the hydrolysis of four β-lactam antibiotics. The kinetics study reveals the higher degradation rate and lower activation energy of MgO/SiO 2 -80 than other benchmark solid base catalysts. The proposed mechanism suggests that small MgO particle size provides more accessible oxygen anions with high proton affinity for the cleavage of the β-lactam ring, so that all hydrolytic products lose antimicrobial activity. The MgO/SiO 2 -80 serves as the potential high-performance solid base catalyst for the real-world antibiotic wastewater treatment .
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2025
·Vol. 36
·期 3
·035110
·
IF 3.4
Qianchun Zhang,Chengcheng Wan,Jiumei He,Zhaoru Ban,Shan Tang,Li Jiang,Yanju Chen,Xixi Long
In this study, mesoporous MgO nanoparticles were successfully synthesized using carbon quantum dots as templates and an outstanding cataluminescence sensor system was established based on these nanoparticles. In a particular situation, the constructed sensor demonstrated remarkable linear range was 0.3106–310.6 ppm (R2 = 0.9990) with a low limit of detection of 0.0994 ppm and a signal-to-noise ratio (S/N) of 3. The mesoporous MgO nanoparticle sensor was utilized to analyze the isobutyraldehyde content in real samples. Outstanding recoveries were achieved within range of 83.4%–111%, with the relative standard deviations (n = 7) ranging from 2.0% to 8.2%. Moreover, the 35 d test results showed that the sensor has good stability. Density functional theory and gas chromatography-mass spectrometry were used to research the mechanism of the designed cataluminescence sensor. This work presents a universal methodology for constructing isobutyraldehyde gas sensors with high sensitivity and selectivity, and mesoporous MgO nanoparticles sensors that expand the applications available in the industry and environment analysis.
研究领域:
材料科学
·
环境分析化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2012
·Vol. 39
·期 4
·3915-3919
·
IF 1.751
Junxia Wang,Hengchang Nie,Chunfeng Lan,Genshui Wang,Xianlin Dong,Xuefeng Chen,Fei Cao,Hongliang He
Porous Pb (Zr 0.95 Ti 0.05 ) O 3 / x MgO (PZT/MgO, x =0, 0.1, 0.2, 0.5 and 1.0 wt%) ferroelectric ceramics were prepared with MgO nanoparticles as reinforcing phase. The effects of MgO nanoparticles on the phase, microstructure, electrical and mechanical properties of as-prepared ceramics were investigated. The results show that the grain size is reduced obviously when increasing the amount of MgO. Compared with pure porous PZT, T C of MgO-added PZT ceramics shifts to higher temperature. Moreover, dielectric, ferroelectric and piezoelectric properties show no much degradation. Further, PZT/MgO ceramics possess enhanced mechanical properties compared to pure porous PZT ceramics, the largest increment of the fracture toughness and hardness being 31.3% and 19.8%, respectively. The optimal electrical and mechanical properties are obtained with the addition of less than 0.5 wt% MgO nanoparticles.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
电子材料
·
固态物理
·
纳米复合材料
✓ 已验证
DOI
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
·
材料科学
·
伤口愈合
·
纳米技术
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）