JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Qiqin Liang,Lei Wang,Xiaosi Qi,Qiong Peng,Xiu Gong,Yanli Chen,Ren Xie,Wei Zhong
Impedance matching characteristics and loss capabilities including magnetic loss, polarization loss and conduction loss are critical factors to improve microwave absorption performances (MAPs). To elevate these aspects, herein, yolk-shell structured CoNi@Air@C/SiO 2 @Polypyrrole (PPy) magnetic multicomponent nanocubes (MCNCs) were designed and successfully fabricated in high efficiency through a continuous co-precipitation route, classical Stöber method, thermal treatment and polymerization reaction. The obtained results indicated that the formation of SiO 2 effectively stabilized the cubic geometrical morphology and yolk-shell structure during the high-temperature pyrolysis process. The introduction of PPy greatly boosted their polarization loss and conductive loss capabilities. Therefore, the as-prepared yolk-shell structured CoNi@Air@C/SiO 2 @PPy MCNCs presented superior MAPs compared to CoNi@Air@C/SiO 2 MCNCs. Furthermore, by regulating the content of PPy, the obtained CoNi@Air@C/SiO 2 @PPy MCNCs displayed tunable and excellent comprehensive MAPs in terms of strong absorption capabilities, broad frequency bandwidths and thin matching thicknesses, which could be ascribed to the unique structure and excellent magnetic-dielectric synergistic effect. Therefore, our findings provided an alternative pathway to effectively utilize the magnetic-dielectric synergy and loss capabilities for the developing yolk-shell structured magnetic MCNCs as the strong wideband microwave absorbers.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Zhenying Liu,Shouwu Huang,Tingting Pan,Shaofeng Dong,Zihang Wang,Moquan Yan,Yin Liu
Ceramic aerogels exhibit significant advantages for thermal insulation applications. However, their practical utilization is hindered by high manufacturing costs, inherent brittleness, and inadequate thermal resistance. In this study, inspired by the dual-network architecture of the human skin dermis, we developed a biomimetic aerogel-like ceramic thermal insulator (ACSM) via a scalable electrospinning and sol–gel strategy. The structural design integrates rigid alumina nanofibers with flexible carbon fibers, which are consolidated into a stable three-dimensional porous framework via nanoscale silica welding. This distinctive fibrous network imparts the material with a low bulk density (0.1107–0.1217 g/cm3), commendable compressive strength (0.31–1.76 MPa), and ultralow thermal conductivity (0.0512–0.0624 W/(m·K)). Furthermore, the three-dimensional mesh structure of the ACSM remains intact after heat treatment at 800 °C in a nitrogen atmosphere, confirming its exceptional thermal stability. Importantly, the material’s comprehensive performance can be precisely tuned by modulating the relative content of the two fiber components. This study establishes a robust foundation for the future development of advanced nanostructured biomimetic thermal insulation materials, with potential applications in aerospace, energy-efficient buildings, and thermal management.
研究领域:
材料科学
·
陶瓷
·
热工工程
·
纳米材料
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zhiwei Wang,Hongfeng Yin,Yun Tang,Qin Hou,Chen He,Hudie Yuan
Herein, we constructed an ordered nanoporous embedding nanoparticles composite by anodic oxidation of Ti 3 SiC 2 in fluorine containing organic electrolyte. Compared to anodized Ti which resulted in TiO 2 nanotubes , the anodized Ti 3 SiC 2 (ATSC) led to the formation of nanostructured TiO 2 /C/SiO 2 composite. The morphologies of oxides in the composite also varied with different anodization parameters. The ATSC could be directly used as an electrode without further processes, which possessed a superior structure and composition with a visible-light photocurrent density of 7.56 μA cm −2 , initial reversible area capacity of 6.18 F cm −2 , which were respectively 1.32 and 6.87 times higher than those of the anodized Ti (AT), respectively. The ATSC synthesized by such a feasible fabricating strategy shows favorable photoelectrochemical properties and remarkable stability, and may broaden the bifunctional material prospects of anodized MAX phases.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 17
·2478
·
IF 5.3
Ning Wang,Yuanyuan Zhao,Xuelian Wu,Dapeng Li,Ruguang Ma,Zhigang Chen,Zhengying Wu
In this study, a Cu NPs-incorporated carbon-containing mesoporous SiO2(Cu/C-SiO2) was successfully synthesized through a grinding-assisted self-infiltration method followed by an in situ reduction process. The obtained Cu/C-SiO2was then employed as a Fenton-like catalyst to remove tetracycline (TC) from aqueous solutions. TEM, EDS, XRD, N2adsorption–desorption, FTIR, and XPS methods were used to characterize the crystal structure, morphology, porosity, chemical composition, and surface chemical properties of the catalyst. The effects of initial TC concentration, catalyst dosage, H2O2dosage, solution pH, HA addition, and water media on the TC degradation over Cu/C-SiO2were investigated. Scavenging and electrochemical experiments were then carried out to analyze the TC degradation mechanism. The results show that the Cu/C-SiO2can remove 99.9% of the concentrated TC solution (C0= 500 mg·L−1), and it can be used in a wide pH range (R.E.= 94–99%, pH = 3.0–11.0). Moreover, hydroxyl radicals (•OH) were detected to be the dominant reactive species in this catalytic system. This study provides a simple and promising method for the synthesis of heteroatom-containing mesoporous catalysts for the decomposition of antibiotics in wastewater.Keywords:Cu nanoparticles;mesoporous silica;Fenton-like catalyst;tetracycline
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ming Zhang,Zhonglin Chen,Jingqi Ruan,Weizhen Shao,Wenxian Wei,He Guo,Zhanghao Chen,Weichuan Qiao
Confined catalytic provides a novel approach to achieve efficient removal of pollutants, however, the tedious preparation process and lower catalytic activity of catalysts are the main restrict for their widespread use. Here, the in-situ doping and reaction kinetics regulation strategy have been proposed to prepare yolk-shell Fe 3 O 4 /Co 3 O 4 /C@SiO 2 nanoreactors (YSFNs) for plasma-catalytic degradation of organic pollutant. In the preparation process, on the one hand Fe(acac) 3 was in-suit doped into ZIF-67, on the other hand the nucleation/growth rate of ZIF-67 is faster than the hydrolysis/polycondensation rate of tetraethyl silicate (TEOS), and thus generated Fe/ZIF-67@SiO 2 precursor. To present the advantages of YSFNs, dielectric barrier discharge (DBD) plasma for tetracycline (TTCH) degradation was chosen as the model reaction. The results indicate that YSFNs-2 display excellent TTCH degradation performance over only DBD, YSCNs-1/2/3 and Fe 3 O 4 /Co 3 O 4 /C nanoparticles (FNs). The enhanced catalytic performance is ascribed to two aspects: (i) confinement effect of yolk-shell structure improves the utilization rate of active species (structure advantage); (ii) graphitized carbon increases electrical conductively while dispersing the active sites, and thus improves the reaction kinetics (composition advantage). This work indicates that MOFs-derived catalysts with confined catalytic have a promising application prospect for environmental remediation via DBD plasma.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Xiuzhen Xu,Weiqin Feng,Xudong Liu,Zhicheng Jiang,Bi Shi
Graphical A Ru-based catalyst Ru/DGC was synthesized from distiller′s grains for the hydrogenation of phenol into cyclohexanol. The adsorption processes of Ru 3+ and phenol on the catalyst were enhanced by the chemisorption, thereby improving the Ru distribution and the catalytic activity. The high activity, exceptional stability, and the mild hydrogenation conditions make Ru/DGC adequate for industrial applications. Selective hydrogenation of lignin-derived phenolic compounds is an essential process for developing the sustainable chemical industry and reducing dependence on nonrenewable resources. Herein, a composite C−SiO 2 material (DGC) was prepared via the stepwise pyrolysis and steam activation of the distiller′s grains, a fermentation solid waste from the Chinese liquor industry. After Ru loading, Ru/DGC was used for the catalytic hydrogenation of phenol to cyclohexanol. Steam activation remarkably increased the hydrophilicity and specific surface area of DGC, introducing oxygen-containing functional groups on the surface of DGC, thereby promoting the adsorption of Ru 3+ and phenol. Additionally, the large specific surface area facilitated the dispersion of the active metal. Furthermore, the steam activation of DGC promoted the graphitization of the carbon matrix and formed Si−H/Si−OH bonds on the SiO 2 surface. The benzene ring of phenol interacted with the carbon matrix via π–π stacking, and the hydroxyl group of phenol interacted with SiO 2 via hydrogen bonding. The synergistic interactions of phenol at the C−SiO 2 interface enhanced phenol adsorption to promote the hydrogenation. Consequently, 100 % of phenol was hydrogenated to cyclohexanol at 60 °C within 30 min. Furthermore, the optimized catalyst exhibited high activity for phenol hydrogenation even after four reuse cycles. The outstanding stability of the catalyst and its requirement for mild reaction conditions favor its large-scale industrial applications.
研究领域:
化学工程
·
可持续发展
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Fengzhen Gao,Junxuan Liang,Faying Fan,Rui Wang,Benshuai Jiang,Kewei Zhang
Electrochemical gas sensors (EGSs) are the most effective means for detecting NO 2 gas in industry, while facing the issue of exorbitant cost due to the use of expensive Pt catalyst. Herein, well-dispersed C-SiO 2 into polytetrafluoroethylene (PTFE) was adopt as high-stable gas diffusion membrane for ultrafast electrochemical NO 2 sensors. The nano-SiO 2 not only prevents material aggregation but also constructs porous networks between the gas diffusion electrode and gas molecules, providing a larger sensing area for high sensor performance. The fabricated sensor exhibits excellent response linearity, short response time, and high stability. As compared with commercial Pt/C electrode, the sensor response is improved by 170 %. Moreover, a multiple linear regression model was introduced to predict the response values of NO 2 in the range of 5–100 ppm, achieving only 1.5 % deviation from the real values. This work not only demonstrates the feasibility of non-precious metals in gas diffusion membranes but also provides guide for designing next-generation low-cost EGSs.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·Vol. 22
·期 2
·e10087
·
IF 12.1
Fujian Liu,Min Li,Mengnan Liu,Yujie You,Su Liu,Qiangyu Xue,Azim Abdullaev,Yinsong Si
Flexible electromagnetic interference (EMI) shielding inorganic materials integrated with thermal management remain highly desirable for next-generation wearable electronics in protective applications. Here, a core–shell carbon@carbon/silica (C@C/SiO 2 ) composite nanofiber is fabricated via a coaxial electrospinning and subsequent carbonization. By tailoring the carbon content in the core and the carbonization temperature, the resulting C@C/SiO 2 nanofiber achieves a gradient interfacial architecture. Benefiting from the continuous C core and the groove-like C/SiO 2 shell, the C@C/SiO 2 nanofiber exhibits high flexibility, superior EMI shielding, and reliable thermal control performance. The optimized conductivity and impedance matching endow the composite membrane with an outstanding EMI shielding effectiveness of 30.8 dB and a high shielding effectiveness/thickness value of 133.7 dB mm −1 at only 0.23 mm thickness, corresponding to a shielding efficiency exceeding 99.92%. Moreover, it delivers ultrafast and stable Joule heating behavior, reaching ≈220 °C within 10 s at a low voltage of 10 V and a maximum temperature of 250 °C. Meanwhile, the membrane also maintains structural and functional stability even after 8000 bending cycles and 100 thermal shock cycles. This work provides a tunable route toward lightweight, durable, and highly efficient EMI shielding membranes for applications in flexible electronics and harsh-environment protection systems.
研究领域:
材料科学
·
纳米技术
·
电磁屏蔽
·
柔性电子学
·
热工工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Yang Guo,Rui Zhou
Corrosion-resistant ferromagnetic absorbers (FMAs) with self-healing properties are crucial for enhancing their durability under harsh conditions. Herein, we fabricated lychee-like FeSiAl (FSA)@C@SiO 2 @1H-Benzotriazol (BTA) coupled with multiple heterogeneous interfaces by coating FSA with a C@SiO 2 @BTA layer using sol-gel, thermal reduction, and molecular encapsulation techniques. The FSA@C@SiO 2 @BTA showed superior microwave absorption (MA) performance than FSA, with a widest absorption bandwidth of 10.44 GHz at 1.98 mm and a maximum reflection loss of −57.81 dB at 2.98 mm. The enhanced MA performance was due to the better impedance matching and the synergistic effects of interfacial and dipole polarization induced by the C@SiO 2 @BTA layer. Moreover, the FSA@C@SiO 2 @BTA exhibited a remarkable corrosion resistance, with a corrosion rate of 3.28 × 10 −10 m/s, which was two orders of magnitude lower than that of FSA, and a corrosion protection efficiency of 99.0 %. The epoxy resin coating containing FSA@C@SiO 2 @BTA also demonstrated a self-healing ability within 5 min after being damaged mechanically. This study presents a novel model that integrates MA, corrosion resistance, and self-healing, heralding new avenues for developing corrosion-resistant FMAs in marine applications.
研究领域:
材料科学
·
腐蚀与防护
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 31
·14844-14856
·
IF 6.97
Haoru Shan,Xiangyang Dong,Xiaota Cheng,Yang Si,Jianyong Yu,Bin Ding
The development of inorganic membranous catalysts with both large mesopores and superb flexibility is extremely favorable for the enhancement of their catalytic oxidation activity for the degradation of antibiotic pollutants in wastewater via sulfate radical-based advanced oxidation processes; however, there still exists a huge challenge for inorganic materials to simultaneously realize these two properties. Herein, metallic copper-doped carbon/silica nanofibrous membranes (Cu@C/SiO2 NFMs) with large mesopores, superb flexibility, and robust mechanical strength were fabricated through a sol–gel electrospinning and subsequent in situ carbonization reduction method. The synthesized Cu nanoparticles were homogeneously distributed throughout the mesoporous C/SiO2 nanofiber matrix, which enabled the resultant Cu@C/SiO2 NFMs to be applied as heterogeneous catalysts, and their catalytic performance was systematically assessed through activating persulfate for the elimination of tetracycline hydrochloride (TCH) in water. The fabricated Cu@C/SiO2 NFMs provided outstanding catalytic performance towards TCH with a high removal efficiency of 95% in 40 min and a rapid removal speed of 0.054 min−1. Moreover, the membranes could be facilely recycled through being directly separated from water without any post-processing. Such a facile strategy for preparing mesoporous and flexible metal-doped inorganic nanofibrous membranes may offer novel insights for designing new types of heterogeneous catalysts for antibiotic-containing wastewater treatment or other potential applications.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
水处理
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Shuning Chen,Tengfei Ren,Xiaoying Zhang,Zuoyong Zhou,Xia Huang,Xiaoyuan Zhang
Heterogeneous catalytic ozonation (HCO) is attractive for water decontamination and catalyst is a core element. However, it is difficult to maintain high efficiency and stability of catalysts under stern conditions. In this study, we proposed Mn-loaded C-SiO 2 -Framework (Mn-CSF) which contained stable silica core and robust carbon shell for efficient catalytic ozonation. The pseudo-first-order kinetic rate constant for oxalic acid removal of Mn-CSF catalytic ozonation was 160 % and 875 % higher than those of Mn-SiO 2 and pristine CSF, respectively. Mn-CSF was also proven effective in gasification wastewater treatment , where the COD was decreased to 46 mg·L −1 , 37 % lower than that of Mn-SiO 2 . These results indicated that the graphitization carbon layer and Mn significantly enhanced the activity of the catalyst. Furthermore, a fulvic-like component and a protein-like component were recognized through 3D-EEM in coal gasification wastewater. It was proven that Mn-CSF catalytic ozonation exhibited higher fulvic-like component and protein-like component removal compared with ozonation. Moreover, O 2 − and 1 O 2 were identified to be responsible for organic degradation in this research. Sufficient external specific surface area and porous structure were important for complex wastewater treatment. Specifically, external specific surface area could enhance the degradation of macromolecular organics while porous structures were vital for smaller molecular pollutant removal . The results highlighted that Mn-CSF was a promising HCO catalyst for advanced wastewater treatment, and this study provided evidence of relationship between structure of catalysts and HCO efficiency.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2021
·Vol. 42
·期 6
·3000-3010
·
IF 3.171
Peng Yin,Zhicheng Shi,Liang Sun,Peitao Xie,Davoud Dastan,Kai Sun,Runhua Fan
Polymer nanocomposites with high energy-storage capability have been widely used in electronic devices. To achieve further enhanced energy density, developing nanofillers with tailored compositions and nanostructures is demonstrated to be an effective strategy. Especially, hybrid nanoparticles (NPs) with abundant internal interfaces are acknowledged as a promising candidate. Here, a class of carbon/silica hybrid nanoparticles (C/SiO 2 h-NPs) with disorderly mixed nanostructures are synthesized and employed to prepare C/SiO 2 h-NPs/polyimide nanocomposites. To reveal the influence of internal interfaces on dielectric properties, a series of comparative composites co-filled with C and SiO 2 NPs are also prepared. The breakdown strength of the C/SiO 2 h-NPs/polyimide composites can reach 303.96 kV/mm, which is over 200% that of their counterparts. It is believed that the abundant heterogeneous interfaces inside the C/SiO 2 h-NPs can effectively impede the development of conductive paths, thereby obviously enhancing breakdown strengths. Furthermore, the C/SiO 2 h-NPs/polyimide composite with 5 wt% C/SiO 2 h-NPs demonstrates a high discharged energy density of ~0.612 J/cm 3 at 150 kV/mm, which is about 2.29 times higher than pure polyimide (PI) (~0.267 @ 150 kV/mm), along with a high discharge energy efficiency of 85.9%. This work offers a practicable strategy for the design of functional NPs toward high-performance dielectric composites.
研究领域:
材料科学
·
高分子化学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）