CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 23
·38875-38883
·
IF 5.6
Tauqeer Ahmad,Wen Lei,Daniel Q. Tan,Burhan Ullah,Yiyang Cai,Yaodong Liu,Wen-zhong Lu
The phase stability and dielectric behavior of the (1- x )(Sr 0 . 6 Na 0 . 2 La 0 . 2 Ti 0 . 9 Al 0 . 05 Nb 0 . 05 O 3 )- x NdAlO 3 ceramic system (0.0 ≤ x ≤ 0.5) were systematically studied and optimized through tailored ionic substitution and a conventional single-step solid-state synthesis route. This strategy enabled synergistic enhancement by modifying lattice distortions and phonon dynamics, improving microwave performance of dielectric resonator antennas for potential applications in the C-band frequency range. X-ray diffraction confirmed a stable tetragonal (P4/mmm) phase for 0.0 ≤ x ≤ 0.5, with no secondary phases detected. Rietveld refinement and HRTEM validated solid solution formation , revealing lattice contraction and unit cell volume reduction with increasing x . Raman spectroscopy highlighted phonon modifications due to ionic substitutions. The microwave dielectric properties varied systematically, with ε r decreasing from 215 at x = 0.0 to 36.2 at x = 0.5 due to reduced ionic polarizability . The quality factor (Q × f) reached a maximum of 37,037 GHz at x = 0.4 due to increased atomic packing and minimized phonon scattering. The thermal coefficient of resonance frequency (τ f ) was adjusted from 256 ppm/°C (at x = 0.0) to −12 ppm/°C (at x = 0.5), achieving enhanced thermal stability. The tetragonal phase at x = 0.4 demonstrated outstanding microwave dielectric characteristics, featuring an εr of approximately 42, a Q × f value reaching 37,037 GHz, and a τ f of around −5 ppm/°C. These insights establish a clear structure-property relationship, paving the way for the development of high-performance microwave resonators.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xiaoju Li,Saijun He,Guangdong Yang,Jing Ma,Li Yuan,Xingbin Yang,Zhong Zhang
The excessive use of nitrite (NO 2 − ) has become a major food safety concern, posing a significant threat to public health. Therefore, developing a rapid, accurate, and on-site detection method for NO 2 − is of practical importance. Unlike peroxidase-mimicking nanozymes, oxidase-mimicking nanozymes can directly utilize molecular O₂ as an oxidant to produce ROS, eliminating the requirement for exogenous oxidants such as H₂O₂. Here, cobalt nitrogen doped carbon nanozymes (Co–N/C) with enhanced oxidase-like activity were synthesized by spatial confinement pyrolysis of ZIF-67. The hollow architecture of Co–N/C enhanced both the specific surface area and the density of active sites, thereby boosting oxidase-like catalytic performance. Substrate screening and theoretical calculations revealed that TMB exhibited the LUMO energy level (−0.0222 eV), lower than those of other tested substrates. Leveraging the diazotization reaction of NO 2 − , a paper-based visual detection platform was constructed, and enabling on-site quantification of NO 2 − . The method showed high selectivity, with a detection limit of 0.31 μM, well below national safety standards. This system was successfully applied to the determination of sodium nitrite in sausage, creating a promising strategy for the development of integrated, intelligent point-of-care testing systems.
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MATERIALS LETTERS
·
2025
·
IF 2.7
Yu Fu,Renhong Song,Kun Zhang,Yujun Chen,Lijun Chen,Qianqiu Tian,Wenbin Hu
Transition-metal sulfides (TMSs) are promising cathode materials for all-solid-state lithium batteries (ASSLBs) but suffer from poor electronic conductivity and severe volume expansion. We developed MoS 2 /C nanospheres featuring expanded interlayer spacing (0.71 nm) through facile hydrothermal synthesis. The radially arranged nanosheet architecture maximizes electrochemically active edge sites, while the expanded interlayers enhance Li + diffusion kinetics. The in-situ formed carbon layer provides dual benefits: structural confinement to suppress volume changes and improved electronic conductivity. The MoS 2 /C nanospheres deliver exceptional capacity of 385.1 mAh g −1 after 250 cycles at 1C, substantially outperforming bulk MoS 2 and MoS 2 nanosheets. This synergistic design combining interlayer expansion, hierarchical morphology, and carbon confinement establishes an effective strategy for high-performance ASSLBs cathodes.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiangtao Li,Yunjia Xue,Xueying Zhang,Fan Zhang,Wenhao Hu,Jiachen Liu
The SiC-ZrO 2 coating was prepared on the surface of aluminosilicate ceramic fiber fabric (ASFF) to enhance the radiation heat dissipation. However, the Si-sol in the SiC-ZrO 2 coating caused the fiber to adhere together at high temperatures. The brittle fracture of the ASFF led to a deterioration in its temperature resistance. In this paper, an Al 2 O 3 interface was prepared on the surface of ASFF by spraying alumina precursor. The Al 2 O 3 interface prepared by 3.0 wt% alumina precursor was uniformly covered on the fiber surface. The flexibility of ASFF/Al 2 O 3 /SiC-ZrO 2 was maintained after static oxidation at 1300 °C for 1 h. The tensile strength of ASFF/Al 2 O 3 /SiC-ZrO 2 at 1200 °C were increased from 5 to 7 MPa to 21.35 ± 2.58 MPa. The Al 2 O 3 interface not only limited the direct contact between Si-gel and fiber, but also reacted with Si-gel to produce mullite at high temperature. The problem of fiber adhesion caused by Si-sol in ASFF matrix was solved. Additionally, the SiC-ZrO 2 coating reduced the surface temperature of ASFF rom 1700 °C–1300 °C. Combining the radiation performance of SiC-ZrO 2 coating and the isolation effect of the Al 2 O 3 interface, ASFF/Al 2 O 3 /SiC-ZrO 2 was able to operate continuously for 300 s under the 1700 °C butane-oxygen flame heating condition.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yuanliang Gu,Zinan Zhang,Shengshen Gu,Qi Zhang,Meng Guo,Yang Pan,Genghao Gong,Zhaoliang Cui,Xiuxiu Ren,Jing Zhong
1,2-bis(triethoxysilyl)ethane (BTESE)-derived organosilica membranes have good acid-resistant stability in the application of acetic acid dehydration via pervaporation technology. To enhance the separation performance of water (0.26 nm) and acetic acid (0.43 nm), graphitic carbon nitride (g-C 3 N 4 ) distinguished by its periodic nanoporosity (0.31-0.34 nm) and hydrophilic functionality, offers exceptional potential for organosilica-based membranes improvement. Herein, we tailored g-C 3 N 4 nanostructures as 2D nanosheets (4 nm thickness) and 0D quantum dots (4 nm diameter), and embedded them into BTESE membranes. For their thermal stability, the nanosheets enhanced structural integrity due to interlayer covalent/hydrogen bonding networks, while quantum dots exhibited a larger weight loss but preserved more residues at 800 o C. Nanosheets incorporated BTESE/g-C 3 N 4 composites reduced BTESE pore size, amplified surface hydrophilicity and membrane thickness, whereas quantum dots with abundant functional groups minimally altered BTESE matrix structures. In pervaporation of acetic acid/water, BTESE performance was improved by both morphologies of g-C 3 N 4 fillers at the same optimal loading. The nanosheet-incorporated membrane (BTESE/CN-NSs-3) achieved a separation factor of 2327 with a flux of 2.35 kg/m 2 ·h, while quantum dots-incorporated membrane (BTESE/CN-QDs-3) exhibited a higher flux of 2.52 kg/m 2 ·h but a lower separation factor of 1352. In feed concentration (50–90 wt% AcOH) and temperature dependent (55–95 °C) operations, nanosheets facilitated molecule sieving through interlayer channels, whereas quantum dots enabled lower-resistance pathways by diffusivity dominated permeation. This work establishes g-C 3 N 4 dimensionality modulating organosilica membrane’s transport hierarchy, providing a selection for developing acid-resistant membranes in improving flux and separation factor.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Haibo Ouyang,Wenlu Li,Cuiyan Li,Tianzhan Shen,Leer Bao,Sirui Wu
ZrO 2 @C spherical powder was synthesized via a solvothermal method and utilized in the fabrication of ZrC ceramics through direct ink writing (DIW) to enhance rheological properties and reduce sintering temperature. The effects of solid content on the rheological behavior and printability of the ZrO 2 @C paste were systematically investigated. The ZrO 2 @C paste exhibited typical pseudoplastic fluid characteristics and viscoelastic properties, demonstrating excellent shape retention and shear-thinning behavior. Optimal solid content and printing speed were determined to be 54 wt% and 100 mm/s, respectively, leading to superior printability. Using these optimized parameters, green bodies with planar and lattice structures were rapidly and precisely fabricated. After reactive sintering at 1600 °C, the resulting ZrC ceramic achieved a promising bending strength of 30.9 MPa. This study provides a robust strategy for the rapid fabrication of ultrahigh-temperature ceramics with complex geometries.
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Nano Research
·
2018
·Vol. 12
·期 3
·517-523
·
IF 7.994
Liu Tie,Wang Leidanyang,Huang Tao,Yu Aishui
Design and fabrication of framework-structured porous precursors have been regarded as a prospective albeit challenging strategy to obtain bimetal/NC-enriched bifunctional elecrocatalysts. In this work, an effective bottom-up approach involving solution-based self-assembly and a post-annealing process was developed to confine (Co, Zn)-N-C active sites into N-enriched graphitic carbon nanocages. This novel architecture containing N-doped-C stabilized bimetallic nanoparticles derived from ZIF precursors was well-studied by a series of characterization and analysis techniques. Details were given that these well-dispersed (Co, Zn) nanoparticles were encapsulated into the pyridinic-N-dominated graphitic carbon nanocage with a total metal loading of approximately 7.4 at.%. This favorable hierarchical structure not only enhances the electron conductivity, but also owns a sufficient BET surface area facilitating the gas-liquid-solid triphase reaction and producing more space to store discharge products. Importantly, results infer that the interesting nanoframes manifests a satisfying ORR/OER activity and enhanced cell performance whether liquid or solid-state electrolytes are used. As such, our work rationalizes that this type of cage-shaped bimetal-N-C material is promising for high-performance Li-O 2 batteries.
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CARBON
·
2013
·
IF 5.868
Xingyun Li,Xiulian Pan,Yonghua Zhou,Xinhe Bao
A C–SiC composite with a thin layer of carbon surrounding the SiC substrate has been produced by the reaction of SiC with CCl 4 . The pore structures , graphitization levels and the chemical compositions can be finely modulated by the synthesis temperature, and atmosphere. A higher synthesis temperature accelerates the chlorination rate, increases the thickness of carbon layers and enhances their graphitization. Mesopores can be generated in C–SiC composites in comparison to predominant micropores in commercial activated carbon (AC), particularly in the presence of reactive atmosphere such as CO 2 and NH 3 . Furthermore, with cofeeding of NH 3 with CCl 4 , N heteroatoms can be incorporated into the carbon layer and the N content varies in a range of 4.7–9.5 at.%, depending on the synthesis conditions. Both increased fraction of mesopores and their sizes, as well as N doping facilitate significantly hydrogenation of 4-carboxybenzaldehyde. The activity of Pd catalyst supported on N-doped C–SiC is five times that on commercially used AC under the same conditions.
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高影响因子
CARBON
·
2022
·
IF 11.307
Dangcheng Su,Yuanhua Xiao,Yingliang Liu,Shengang Xu,Shaoming Fang,Shaokui Cao,Xuezhao Wang
2D MXenes (transition metal carbides, Ti 3 C 2 T x ) with large surface area and metallic conductivity are widely used as supporters in catalysts. Unfortunately, the single MXene sheets would deteriorate in the presence of oxygen and water, which is almost the same as the environment of oxygen reduction reaction (ORR). Herein, an “armor” was constructed to encapsulate the oxidizable MXene by a confined in-situ oxidative polymerization strategy, employing the electrostatic interaction between the exfoliated MXene sheets (negatively charged) and oxidant (Fe 3+ , positively charged). The ultra-dispersed binary Fe 3 N and Co sits coupled with the large surface area MXene supporter synergy to endow more exposed active sites, meanwhile, the density functional theory (DFT) studies reveal that a moderate binding strength between the intermediates and the binary active sites was effectively modulated to enhance the ORR performance. The synthesized Fe 3 N/Co–N–C@MXene exhibits an impressive half-wave potential (E 1/2 , 0.871V) and a lower Tafel slope of 52.56 mV dec −1 than that of Pt–C-20% (74.89 mV dec −1 ). The Fe 3 N/Co–N–C@MXene based ZAB exhibits a four times higher peak power density (189.16 mW cm −2 ) than the Pt–C-20% based ZABs and superior cycle stability within 320 h. Furthermore, the assembled flexible ZABs shows high flexibility and stability in different bending scenarios.
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Nanoscale
·
2014
·Vol. 6
·期 14
·7954-7958
·
IF 6.739
Wenya Cai,Xianghu Tang,Bai Sun,Liangbao Yang
In this study, multifunctional Fe3O4/C/Au nanoparticles (NPs), which catalytically integrated active small Au NPs with surface-enhanced Raman scattering (SERS) active large Au NPs, were fabricated via a facile method and employed for the in situ SERS monitoring of a catalytic reaction of p-nitrothiophenol (p-NTP) to p-aminothiophenol (p-ATP). In addition, the effect of magnet power was tested and it was demonstrated that the SERS intensity of the reaction system was stronger, and the reaction proceeded more smoothly because more hot spots existed and remained the same in the magnetic field; hence, the catalytic rate could be determined.
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International Journal of Applied Ceramic Technology
·
2019
·Vol. 17
·期 3
·874-885
·
IF 1.074
Zilong Lu,Bixiong Bie,Aimin Pang,Wei Li,Jianling Yue,Xiaozhong Huang,Haitang Yang
SiC f /SiC composites that possess PyC or BN interface layers were fabricated and then oxidized in moist air at 1000, 1200, 1400, and 1600°C. High-resolution CT was used for capturing 3D images and quantifying the SiC phase, mesophase, and voids. The oxidation behavior and microstructural evolution of SiC f /SiC with PyC or BN interface are discussed in this study. The microstructure of the SiC f /SiC with a PyC layer was seriously damaged in moist air at high temperature, whereas the BN interface layer enhanced the oxidation resistance of the SiC f /SiC. These results are also confirmed by using XRD, oxidation mass gain, tensile testing, and SEM measurements. The results of the oxidation behavior and microstructural evolution for SiC f /SiC oxidized in dry air are also compared with the results of this study. Comparing the SiC f /SiC with a PyC interface layer, the composite with a BN interface layer oxidized in moist air exhibits a high void growth rate and a low SiO 2 grain growth rate from 1000 to 1600°C. This work will provide guidance for predicting the service life of SiC f /SiC for multiscale damage rate models of materials at a local scale and will also provide guidance on the life service design of SiC f /SiC materials.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 26
·13351-13363
·
IF 11.301
Gulian Wang,Xingyu Zhu,Arif Rashid,Zhongli Hu,Pengfei Sun,Qiaobao Zhang,Li Zhang
The poor ionic conductivity and high working temperatures (normally >60 °C) of poly (ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) greatly limit their application in all-solid-state batteries. To mitigate these issues, for the first time, we report here an organic polymer filler, hydrolyzed polymaleic anhydride (HPMA), that can greatly suppress PEO crystallinity, enhance the ionic conductivity of PEO-based SPEs (1.13 × 10−4 S cm−1 at 35 °C) and support battery operation at 35 °C. PEO–HPMA SPEs feature high flexibility, incombustibility, wide electrochemical operating window and stability against lithium. The as-derived Li/PEO–HPMA/LiFePO4 all-solid-state batteries show outstanding rate capability, high reversible capacity and long-term stability up to 1250 cycles. More impressively, the soft-packaged Li/PEO–HPMA/LiFePO4 cells show high safety under various extreme conditions such as cutting and perforation. The PEO–HPMA SPE-based quasi-solid-state lithium-sulfur batteries are also presented. This work demonstrates a facile approach that unlocks the low-temperature application of PEO SPE-based all-solid-state batteries.
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危险品化学品经营许可证（带存储）