COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Yixiang Chen,Tongcheng Zuo,Yu Jiang,Jiajia Gui,Wanqi Feng,Dan Yu,Wei Wang
Flexible pressure sensors embody outstanding mechanical and sensing performance, particularly in the fields of personal health monitoring and artificial intelligence, while catering to multifunctional applications resilient against harsh weather conditions. Among these, Ti 3 C 2 T x MXene-based aerogel materials with high surface area and excellent conductivity have attracted a lot of attention. However, there are big challenges in improving the mechanical properties at low densities and designing multi-level pore structures . Herein, the prepared silane monomers (MP) are firstly synthesized by 3-(Trimethoxysilyl) propyl methacrylate (MPTES) and polyethylene glycol diacrylate (PEGDA), then polydopamine-modified silicon dioxide (PDA-SiO 2 ) nanofibers employed with MXene nanosheets form covalent cross-linking nanofiber aerogels. The multi-level stable structure improves both mechanical strength and elasticity. The assembled MXene/MP/PDA-SiO 2 pressure sensors exhibit a high sensitivity of −0.83 kPa −1 , a rapid response time of 48 ms, a minimum 1 % strain detection limit, and reliable stability over 10,000 cycles. Furthermore, these sensors can be used for human motion detection and health diagnostics, and show good personal thermal management performance. This work holds a promising candidate for the next generation of multifunctional flexible electronic devices.
研究领域:
材料科学
·
传感器技术
·
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
Huirong Chen,Jiamin Li,Zixin Huang,Yi Zhang,Yuee Ruan,Xiaonan Luo,Fengfeng Chen,Ruliang Liu
The increasing demand for sustainable and efficient catalytic processes has driven the development of advanced nanoreactors. In this study, we present a sophisticated Metal–organic framework (MOF)-template-mediated approach to synthesize yolk–shell Co-CN@SiO2 nanoreactors, where Co nanoparticles were supported on carbon nitride (C–N) nanosheets as the core encapsulated within a nanoporous SiO2 shell. This yolk–shell structure with confined cavities can provide a high surface area and overcome challenges such as Co nanoparticle sintering and mass transport limitations, resulting in superior catalytic performance. Remarkably, these nanoreactors achieved a 99% yield of benzyl alcohol from benzaldehyde hydrogenation under base-free conditions. Moreover, the influence of calcination temperatures on the structural evolution of the Co-based silica nanoreactors was explored, revealing the critical role of synergistic interaction between C–N and Co nanoparticles in boosting catalytic activity. Density functional theory calculations were conducted to investigate the adsorption energies of reacting species on the catalyst, providing mechanistic insights into the enhanced hydrogenation activity of the Co-CN@SiO2. This work offers valuable insights into the rational design of advanced nanoreactors for various catalytic applications, particularly in the field of green chemistry and sustainable synthesis.
研究领域:
化学工程
·
绿色化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 2
·1871-1882
·
IF 1.338
Shi Haowei,Yang Junya,Zhu Lizhong,Yang Yuxiang,Yuan Hongming,Yang Yubing,Liu Xiangnong
In this paper, the chain-like core–shell structure Fe3O4@SiO2@Chitosan composite nanoparticles were synthesized by a two-step coating and following crosslinking glutaraldehyde on chitosan shell. The composite particles showed nearly monodisperse
105 sized particles with a core diameter of 80 nm and chitosan shell thickness of 12 nm. The synthesis conditions of the product were studied, and the morphology and properties of the composite nanoparticles were characterized by IR, XRD, TEM, SEM, EDS and VSM. The adsorption properties of
Hg2+, Pb2+ or Cu2+ ions on Fe3O4, Fe3 O4@SiO2 and the composite particles were in detail studied using the colorimetric method based on forming colored mercuric dithizone, rhodamine-Pb2+ complex and DDTC-Cu(2+)
complex. The results showed, adsorption isotherm, kinetics and separation coefficient of heavy metal ions on these three magnetic nanoparticles were concerned with pH, metal ions’ electronic configuration, silica coating and chitosan shell respectively. In addition, the recycle efficiency
was also studied. The findings demonstrated that Fe3O4@SiO2@Chitosan composite nanoparticles have great application value in the adsorption and separation of heavy metal ions.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 30
·期 5
·1735-1743
·
IF 1.637
Chen Yufei,Wu Yunzhong,Geng Chengbao,Li Zhiguo,Dai Guoqing,Cui Weiwei
KH560-SiO 2 /polyethersulfone/bismaleimide-phenolic epoxy resin (KH560-SiO 2 /PES/BMI-EPN) composite had been prepared and studied, in which BMI-EPN resin was used as matrix, PES resin and SiO 2 modified by silane coupling agent (KH560-SiO 2 ) as toughness reinforcing agent. The curing kinetics and the apparent activation energy of the resin system were studied and calculated by the non-isothermal differential scanning calorimetry. The micro-morphology was investigated by scanning electron microscope (SEM), and the mechanical, thermal and dielectric properties of the composites was analyzed. The morphology showed that PES resin and KH560-SiO 2 were evenly dispersed in the matrix and a multi-phase structure was formed. The flexural modulus, flexural and impact strength of composite were 4.2 GPa, 156.2 MPa and 20.9 kJ m −2 , with an increase of 31%, 50% and 83% than those of resin matrix, respectively, when the content of PES resin was 4 wt% and KH560-SiO 2 was 1.5 wt%. Furthermore, the thermal decomposition temperature ( T d ) of the composite was 393 °C which was 15 °C higher than that of resin matrix. The results of dielectric properties showed that the dielectric constant of the composite first decreased and then increased with the increase of KH560-SiO 2 doping content, and the dielectric loss did not change significantly. The dielectric constant and dielectric loss tangent were 4.55 and 0.0029 at 10 Hz, when the content of KH560-SiO 2 was 1.5 wt%. This study provided theoretical data for expanding the application range of phenolic epoxy and bismaleimide.
研究领域:
材料科学
·
高分子化学
·
复合材料工程
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2025
·
IF 4.4
Tao Zhu,Yuan Yuan,Xingde Wei,Xujiang Hua,Xu Dai,Huiying Xiang,Linbo Song,Ruijin Liao
Ice accretion on wind turbine blades severely impacts the power generation efficiency, equipment lifespan, and safe operation of wind farms. Low-interfacial toughness materials have demonstrated potential for large-scale deicing under controlled laboratory conditions. However, their anti-icing and deicing performance in complex and harsh natural fields is rarely studied. Herein, low-interfacial toughness PDMS/SiO 2 coatings are prepared on aluminum plates. Field tests for anti-icing, icephobic, and large-scale deicing are conducted in the high-altitude regions of Southwest China. Fortunately, the PDMS/SiO 2 coating exhibits exceptional anti-icing and icephobic properties. The coating effectively delays the freezing of water droplets and natural ice accretion, significantly reducing icing weight and ice adhesion strength. During natural ice-covering processes, the ultra-low ice adhesion of the PDMS/SiO 2 coating aids in efficient ice shedding through wind and gravity and ensures rapid melting post-icing. Additionally, the PDMS/SiO 2 coating excels in large-scale deicing performance. The constant deicing force, governed by low interfacial toughness, provides robust assurance for efficient large-scale deicing of ice layers of varying sizes under gravity. Moreover, the coating demonstrates stable durability, retaining excellent deicing capabilities during icing/deicing cycles, UV radiation, and high-temperature aging tests. This study lays an experimental foundation for the further research and application of low-interfacial toughness materials.
研究领域:
材料科学
·
可再生能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 1
·1-14
·
IF 2.8
Zhang Yajuan,Lu Yang,Shan Yiting,Wang Jie,Feng Jingmin,Zhou Hongqing
Herein, (1 − x )CaO–Al 2 O 3 –B 2 O 3 –SiO 2 (CABS)/ x Ba(Mg 1/3 Nb 2/3 )O 3 (BMN; x = 0.4, 0.45, 0.5, 0.55, and 0.6) composites were prepared, and the impact of the BMN and low-softening-point glass content in CABS/BMN composites on the sintering, dielectric, thermal, and mechanical properties of the prepared composites was investigated. The main crystal phases of the CABS/BMN composites are BMN and Ba 2 NaNb 5 O 15 (BNN). The crystallization temperature of the composite was reduced by an appropriate amount of BMN. BMN ceramics (40–60 wt%) was added to the CABS glass, and the composites were sintered at 800 °C, 825 °C, 850 °C, 875 °C, and 900 °C. To elucidate the influence mechanism of different glass contents and sintering temperatures on the properties of the composites, different qualitative and quantitative instruments were used to study the composite properties. The CABS/BMN composite containing 50 wt% CABS glass sintered at 875 °C exhibits the following ideal properties: volumetric density of 3.57 g/cm 3 , dielectric constant of 17.97, dielectric loss of 6 × 10 −4 , \(Q \times f\) value of 10,947 at 9.5 GHz, bending strength of 157.7 MPa, and coefficient of thermal expansion of 5.9 ppm/K. Microstructure analysis reveals that the microstructure of the composite is dense, the pores are few, the surface morphology is uniform and flat, and the composite does not react with silver electrodes, making it suitable for applications utilizing medium dielectric constant low-temperature co-fired ceramic materials at low sintering temperatures.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Haiyan Wang,Linrui Bai,Shaolong Zhong,Qian Yang,Zhimin Dang
Dielectric capacitor is an important component of power systems , but its low dielectric polarization and undesirable dielectric loss have still held back the development of miniaturized microelectronic devices. Hence, we reported core@shell structured fillers with a conducting material@insulating material double-shell to improve the dielectric performance of the poly (vinylidene fluoride) (PVDF) composites. The hybrid fillers introducing ultra-short carbon nanotube (SSCNT) as an inner layer between BaTiO 3 (BT) as a core and silica (SiO 2 ) as an outer shell were synthesized. As the thickness of the insulating shell is enough thin, the BT@SSCNT@SiO 2 /PVDF composites exhibit an enhanced dielectric constant and a concurrently suppressed dielectric loss with the decreasing thickness. The composite incorporating the filler with the thinnest SiO 2 shell has the highest dielectric constant of 12.27 and the lowest dielectric loss of 0.023 at 20 wt% filler loading where the breakdown strength is about 15 less than the maximum value of 192.5 kV/mm. Furthermore, the hybrid fillers endow the composites with impressively stable dependence on frequency in a wide range of 10 2 ∼10 5 Hz. The achievement can be ascribed to the conducting property of the SSCNT inner layer and the suitable thickness of the insulating outer layer. They can synergetically provide the composites with an optimized polarization effect at a broad frequency resulting from the improved electrical field. This work reveals that a proper structure of the core@conducting material@insulating material core@double-shell filler can be an approach to optimize the overall dielectric performance of the polymer-based composites with high energy storage density .
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Guohao Xu,Xuedong Zhu
A core-shell structured Zn/SiO 2 @ZSM-5 catalyst was prepared by a hydrothermal coating method, and its physicochemical properties and catalytic performance in methane co-aromatization with propane were studied using a conventional solid catalyst (Zn/ZSM-5) as the comparison. Results revealed that methane was activated on Zn sites to form a large number of Zn methyl species and then incorporated during the aromatic formation process to promote the formation of aromatics. At a space velocity of 3600 mL g −1 h −1 and the reaction temperature of 550 ℃, the methane, propane conversion and the aromatics selectivity of Zn/SiO 2 @ZSM-5 catalyst were 7.9 %, 95.9 % and 88.1 %, respectively, which were higher than those of Zn/ZSM-5 catalyst by 2.8 %, 6.7 % and 6.8 %, respectively. The unique reaction pathway of core (Zn/SiO 2 , Zn sites)-shell (ZSM-5, acid sites) was mainly responsible for the superior performance in methane co-aromatization with propane. Meanwhile, the core-shell structured Zn/SiO 2 @ZSM-5 catalyst aroused the formation of distinct micro-macroporous system, which facilitated quick diffusion of desired products out of the intraframework channels and inhibited the formation of carbon deposits. These features of Zn/SiO 2 @ZSM-5 catalyst granted it superb diffusion ability and unique core-shell structure, which greatly enhanced the methane, propane conversion and aromatic selectivity together with a preeminent catalytic stability.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2017
·
IF 0
Li Wang,Lei Sun,Zebin Yu,Yanping Hou,Zhenbo Peng,Fei Yang,Ying Chen,Jun Huang
The Fe 3 O 4 @SiO 2 -BiOBr (FSB) magnetic composite was prepared and introduced into the dielectric barrier discharge (DBD) system as a heterogeneous Fenton-like photocatalyst for synergistic degradation of perfluorooctanoic acid (PFOA). The FSB was characterized by X-ray diffraction, UV–vis diffuse reflectance spectra, energy dispersive X-ray spectroscopy and scanning electron microscope. Characterization results demonstrated that BiOBr was successfully coated on Fe 3 O 4 @SiO 2 , forming FSB, and it exhibited good UV & visible response. The presence of FSB accelerated PFOA degradation: PFOA removal efficiency and total organic carbon removal from DBD-FSB system increased from 73.5% to 92.9% and 28.9% to 62.5%, respectively, within 60 min under reaction conditions of 20 mg L −1 PFOA, initial pH 4.28, 100 mg L −1 FSB and 22 kV peak voltage, as compared with DBD system. Accordingly, defluorination efficiency of PFOA and energy efficiency increased from 21% to 32.8% and 46.39 mg kW −1 h −1 to 72.47 mg kW −1 h −1 , respectively. The synergetic mechanism was attributed to the combination of active species such as OH, H 2 O 2 , O 3 , directly generated from the DBD plasma and a great amount of OH generated from Fenton-like reaction initiated by FSB photocatalyst under light irradiation emitted during discharge. The OH and photogenerated holes played essential roles in the mineralization process. Based on the identified intermediates, possible degradation pathways of PFOA in DBD-FSB system were proposed, and PFOA degradation mainly occurred via the pathway of perfluoroalkyl radical pathway.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 35
·15901-15911
·
IF 3.591
Xiao-yi Liu,Xiu-ping Li,Rong-xiang Zhao,Hao Zhang
Silica gel containing SnCl2-based deep eutectic solvents (DESs) were synthesized by a sol–gel method using SnCl2-based DESs as the loading component. The n%-SnO2/SiO2 (n = 2, 4, 6) supported catalyst was obtained by calcination of silica gel containing SnCl2-based DESs at high temperature. n%-SnO2/SiO2 was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption–desorption and X-ray photoelectron spectroscopy (XPS). A catalytic oxidation desulfurization system with 4%-SnO2/SiO2 as the catalyst and H2O2 as the oxidant was applied to remove organic sulfide in model oil. Compared with the traditional impregnation method, the catalyst synthesized using the sol–gel method showed higher oxidative desulfurization activity. The effects of various factors including loading dose of SnO2, temperature, O/S molar ratio, catalyst dosage, and different sulfides on the desulfurization rate were investigated. The experimental results indicate that the desulfurization rate of dibenzothiophene (DBT), 4,6-dimethyldibenzothiophene (4,6-DMDBT) and benzothiophene (BT) can reach 99.5%, 81.6% and 22.4%, respectively, under the optimal reaction conditions. The desulfurization activity of 4%-SnO2/SiO2 is above 90% after recycling 5 times.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Yu Tian,Zhigang Xu,Yuming Yang,Dan Wang,Zhimin Liu,Xiaoxi Si
In this study, a magnetic composite material was developed by bonding the modified natural polysaccharide chitosan (CTS) with SiO 2 on the surface of magnetic Fe 3 O 4 nanoparticles to detect polychlorinated biphenyls (PCBs). The structural, porosity, and magnetic properties of Fe 3 O 4 @SiO 2 @CTS were characterized by scanning electron microscopy, infrared spectroscopy, X-ray diffraction, nitrogen sorption, and vibrating sample magnetometry. Various experimental parameters affecting the extraction capacity were investigated, including extraction time, desorption time, desorption solvent, solution pH value, and salt ion concentration. Results showed that Fe 3 O 4 @SiO 2 @CTS exhibited excellent selectivity, easy separation by magnet, and reusability (at least 10 cycles). Under optimized experimental condition, this magnetic solid phase extraction material was applied to detect three PCBs with low limits of detection of 0.02–0.15 μg·L −1 . The linear correlation coefficient was higher than 0.998, while the recoveries ranged between 90.34% and 106.99% with the relative standard deviation less than 11.31%. The practical application of Fe 3 O 4 @SiO 2 @CTS was verified through quantitative analysis of PCB residues in environmental water, supporting its promising role in simple, convenient, and low-cost detection of PCBs in real environmental samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 2
·828-837
·
IF 3.925
Tiantian Wan,Zulei Zhang,Hailong Wang,Yiwen Yang,Hanxing Yang,Jian Zhang,Yanbo Zeng,Lei Li,Jinchun Li
Chlorogenic acid (CGA), a cis-diol-containing compound, exhibits anti-inflammatory, antiviral, antimicrobial and anti-oxidation properties. Thus, selective determination of CGA in food products is extremely necessary. In this study, a boron affinity magnetic polymer named Fe3O4@SiO2@PIL was synthesized to detect the concentration of CGA in actual fruit samples. The Fe3O4@SiO2@PIL was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and thermogravimetric (TG) analysis. The results showed that the Fe3O4@SiO2@PIL has uniform morphology, good magnetic properties, suitable structure and high stability. The experimental assays showed that the Fe3O4@SiO2@PIL can detect the concentration of CGA within 7 min, and has a good linear relationship with CGA in the concentration range of 0.025–2 μM (R2 = 0.9989) with a detection limit of 10 nM (S/N = 3). Moreover, the Fe3O4@SiO2@PIL exhibited excellent selectivity and can be reused for at least 5 runs, indicating its good stability and reusability. Finally, the Fe3O4@SiO2@PIL was used to selectively separate CGA in real fruit samples with the recovery ranging from 93.4% to 103.0% and the relative standard deviation (RSD) between 0.7% and 5.1%. This study gives a new insight into the utilization of magnetic materials by grafting boric acid functionalized ionic liquids for specific and rapid detection of natural cis-diol-containing compounds.
研究领域:
分析化学
·
食品科学
✓ 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）