JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Fan Yang,Yongpeng Dong,Yuqiu Wang,Jimei Xue,Shangwu Fan,Xiaomeng Fan,Laifei Cheng
For electromagnetic wave absorbing ceramic matrix composites, it is crucial to control the loss mechanism to achieve stable high-temperature broadband absorption performance. In this work, multiscale structural design is utilized to enrich EMW loss mechanism, synergistically improving the EMW absorption capacity and bandwidth. Firstly, based on the tunability of the fiber preform, three-dimensional carbon fiber periodic units were constructed on an N610 fiber cloth. Then, the intrinsic electromagnetic properties of the N610 fibers were modified by introducing nanoscale absorption units, namely carbon nanowires. The carbon nanowires were diffusely distributed in transparent N610/SiOC composites by controlling the reaction conditions, forming a large number of heterogeneous interfaces and conductive networks. The carbon fiber and carbon nanowires, together with the notable conductivity difference with respect to the N610/SiOC composites, significantly enhance the polarization loss and conductive loss. Besides, the periodically arranged carbon fibers can trap the incident EMWs and reduce their transmission, promoting reflection, scattering, and absorption. The designed N610/SiOC composites exhibit superior EMW absorption performance from room temperature to 600 ℃, with a reflection loss less than −8 dB across the entire investigated band and an effective absorption bandwidth exceeding 10.7 GHz at 4–18 GHz. This innovative multiscale design approach, characterized by a discrete distribution of absorbing units with a high electronegativity difference, represents a fresh avenue for advancing the development of high-temperature and wide-band EMW-absorbing CMCs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhuo Chen,Xiufang Cui,Yongzhi Jing,Guo Jin,Xiang Wang,Yongchao Fang,Xinhe Wang,Dianchao Liu,Bin Wang
This study utilizes modulation of ionic disorder and electronegativity differences for targeted component design of high-entropy ceramic compositions. A series of novel multicomponent ceramics with the general formula ( LaGdYSm ) x 2 Yb x 1 Zr 2 O 7 (x 1 +4x 2 = 2, x 1 = 0.6,0.4,0.2,0) were prepared by solid-state reaction. The evolution patterns of their microstructures were analyzed using XRD and TEM, and the anti-sintering ability and thermophysical properties were evaluated. The results confirm that the multicomponent ceramics gradually transform from the coexistence of pyrochlore/fluorite dual-phase structure to pyrochlore structure with the tuning of the size disorder degree. After 50h of exposure to air at 1500 °C, the ceramics retained excellent phase stability. Segregation of La and Yb elements with large differences in radius size occurs, forming a mixture of the La-rich pyrochlore and the Yb-rich fluorite phases. The specimen with the maximum size disorder exhibits the lowest grain growth rate and the greatest thermal insulation properties. Large lattice distortions and sluggish diffusion effects are responsible for the mutual inhibition of grain growth in the two-phase coexistence zone. The thermal insulation properties of the ceramics show well correlated with the degree of the size disorder, further validating the effectiveness of the component design. Meanwhile, the thermal expansion coefficients of prepared ceramic can reach 11.49 × ∼11.58 × 10 −6 K −1 at 1000–1100 °C. The customization principles used in this work fill a gap in the compositional design methodology for multicomponent lanthanum zirconate-based high-entropy ceramics. It is essential for developing rare-earth zirconates with tunable thermophysical properties in the area of thermal barrier coatings.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2016
·
IF 5.746
Ke Wang,Zhongyun Zhou,Pengfei Zhao,Zeguang Yin,Zhen Su,Ji Sun
A unique gluconic acid treatment coupled with a carbon coating process was used to synthesize Li 4 SiO 4 ceramics (GAC-Li 4 SiO 4 ) with superior performance for high-temperature CO 2 capture. The effects of different synthetic methods, carbonization temperatures, acid sources and acid contents on the performance of the sorbent were studied and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen absorption and thermogravimetric analyses. After the gluconic acid treatment and carbon coating, the GAC-Li 4 SiO 4 had a small crystal size, hollow morphology and enhanced pore features. Significant improvements in CO 2 sorption performance (i.e., low absorption temperature, fast absorption rate, and high capacity) were thus obtained. Moreover, the carbonization temperature, acid content and acid type greatly affected the morphology and chemisorption properties of the Li 4 SiO 4 sorbents. Under the optimized synthetic conditions, the maximum CO 2 absorption capacity was 34.7% after isothermal absorption at 665 °C for 10 min. This sorbent also maintained good cyclic properties.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jun Cheng,Jun Wang,Xiaozhou Wang,Hao Wang
A novel precursor was synthesized by reacting hafnium chloride with dicyandiamide and dimethylformamide. The precursor was characterized via FT-IR and NMR , as well as TG. Subsequently, the precursor was annealed in Ar over a range of temperatures from 1000 °C to 2000 °C, and the microstructural evolution of the ceramics was investigated by XRD , XPS , and TEM. The results show that the carbothermal reduction of the precursor starts at 1150 °C and the ceramic yields at 1500 °C reach 44.6 wt%. The obtained powders exhibit a uniform distribution and are composed of N-doped HfC and graphite. The N-doped structure postponed the oxidation of the HfC(N) ceramics. The HfC(N) ceramics were first oxidized to yield HfO 2 , carbon, and nitrogen, and then the carbon was oxidized with the evolution of CO 2 . The presented synthesis method is believed to be applicable to the preparation of other high-performance ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 13
·3235
·
IF 3.1
Xiang Zhang,Xueying Zhang,Zhongyan Wang,Yunjia Xue,Anran Guo,Liwen Yan,Feng Hou,Jiachen Liu
Mullite fiber felt is a promising material that may fulfill the demands of advanced flexible external thermal insulation blankets. However, research on the fabrication and performance of mullite fiber felt with high-temperature resistance and thermal stability is still lacking. In this work, mullite fibers were selected as raw materials for the fabrication of mullite fibrous porous materials with a three-dimensional net structure. Said materials’ high-temperature resistance and thermal stability were investigated by assessing the effects of various heat treatment temperatures (1100 °C, 1300 °C, and 1500 °C) on the phase composition, microstructure, and performance of their products. When the heat treatment temperature was below 1300 °C, both the phase compositions and microstructures of products exhibited stability. The compressive rebound rate of the product before and after 1100 °C reached 92.9% and 84.5%, respectively. The backside temperature of the as-prepared products was 361.6 °C when tested at 1500 °C for 4000 s. The as-prepared mullite fibrous porous materials demonstrated excellent high-temperature resistance, thermal stability, thermal insulation performance, and compressive rebound capacity, thereby indicating the great potential of the as-prepared mullite fibrous porous materials in the form of mullite fiber felt within advanced flexible external thermal insulation blankets.
研究领域:
材料科学
·
高温材料研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Processes
·
2025
·Vol. 13
·期 2
·376
·
IF 2.8
Lifang Song,Chengwen Wang,Jingping Liu,Yang Li
A high-temperature resistant suspension stabilizer, SIAM-1, for high-density cement slurry used in deep/ultra-deep well cementing has been successfully developed. This suspension stabilizer is based on the temperature-resistant monomers 2-acrylamido-2-methylpropane sulfonic acid (AMPS) andN,N-dimethylacrylamide (NNDMA). Meanwhile, two functional monomers, long-hydrophobic-side-chain temperature-sensitive monomers and temperature-resistant monomer-modified nano-SiO2monomers, were introduced. To enhance the participation of two functional monomers in the polymerization process, a method combining a small amount of acrylamide (AM) and emulsion polymerization was employed, leading to the successful synthesis of SIAM-1 with a high content of functional monomers. The study also explores the effects of polymerization method and AM on the conformational characteristics of the resulting polymers. The results confirm that the polymer structure aligns with the designed configuration, and SIAM-1 demonstrates excellent high-temperature resistance, with a tolerance of up to 210 °C. The optimal dosage of AM was found to be 4% of the total monomer mass. SIAM-1 exhibits excellent high-temperature rheological properties, maintaining a viscosity as high as 128 mP·s at 210 °C. Moreover, it effectively improves the suspension stability of the cement slurry at 210 °C. The density differences in the conventional-density and high-density cement slurries are 0.006 g∙cm−3and 0.039 g∙cm−3, respectively. This research is beneficial for increasing the viscosity of the cement slurry at high temperatures, effectively preventing the settlement of solid-phase particles under high-temperature and high-pressure well conditions. Consequently, it enhances the cementing effect of deep/ultra-deep wells and reduces cementing-related risks.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shuyang Zhou,Hang Zhao,Na Zhang,Lei Yin,Jinbo Bai
With the rapid development of electric vehicles, aerospace technology, and other emerging applications, the demand for polymer film capacitors capable of operating under extreme conditions is increasing rapidly. However, the significant rise in conduction losses at high temperatures and high electric fields results in substantial deterioration in energy storage performance of polymer dielectrics. Thus, designing composite dielectrics in structural to effectively mitigate their conduction losses remains a critical challenge. This study introduces a typical sandwich-structured high-temperature polymer-based composite dielectric, incorporating surface-charged kaolinite nanosheets (KLNS) and the organic molecular semiconductor 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) with high electron affinity in different polyetherimide (PEI) layers, respectively. This construction introduces differential charge traps into the composites to modulate charge migration and capture the charges that injected from electrodes or excited in the dielectric. Experimental results demonstrate that this construction effectively reduces leakage current caused by Poole-Frenkel emission and hopping conduction, thereby suppressing the conduction losses of composites at high temperatures. Consequently, the sandwich-structured composite exhibits an excellent high-temperature stability in electrical properties and the optimized composite filled with 0.2 wt% KLNS in the middle layer and 0.5 wt% NTCDA in the outer layers achieves an ultrahigh discharged energy density ( U e ) of 5.0 J/cm 3 and a high efficiency ( η ) of 88.7 % at 150 °C, representing improvements of 163 % and 41 % compared with pure PEI ( U e ∼ 1.9J/cm 3 , η ∼ 62.8 %), respectively. This study presents an effective strategy for designing composites with enhanced energy storage capabilities under high-temperature and high-electric-field conditions.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Materials
·
2025
·Vol. 5
·期 3
·N
·
IF 11.2
Yulin Xie,Qingyun Dou,Guosheng Li,Yuecong Chen,Xingbin Yan
Zinc-ion batteries (ZIBs) are being explored as a potential alternative to lithium-ion batteries owing to the growing demand for safer, more sustainable, cost-effective energy storage technologies. In such systems, electrolytes, as one of the key components, have a decisive impact on their electrochemical performance. However, Zn anodes in traditional aqueous electrolytes exhibit drawbacks such as severe hydrogen evolution reactions, Zn corrosion and passivation especially at high temperatures, leading to poor cycling performance of ZIBs. Herein, we designed and evaluated a series of hybrid electrolytes consisting of zinc tetrafluoroborate hydrate [Zn(BF4)2·xH2O] as the solute and various organic solvents [tetraglyme (G4), propylene carbonate, and dimethylformamide] for high-temperature ZIBs. Comparative analysis revealed that G4-based hybrid electrolytes exhibit a unique Zn2+ solvation structure primarily surrounded by organic solvent rather than H2O, which substantially reduces H2O-related side reactions and thus promotes more reversible Zn deposition than propylene carbonate-based and dimethylformamide-based hybrid electrolytes. The superiority of G4-based hybrid electrolyte is further confirmed by long stable cycling life of the corresponding Zn||Zn symmetric cell (> 350 h) and Zn-ion capacitor full cell (over 1,400 cycles with 90.7% capacity retention) at 60 °C.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2020
·
IF 2.705
Li Xinxi,Liu Long,Li Shumin,Guo Lin,Li Bin,Zhang Guoqing
Spinel lithium manganese oxide (LiMn2O4) based Li-ion battery (LIB) is attractive for hybrid/full electric vehicles because of its abundant resources and easy preparation. However, operation under an elevated temperature could cause severe capacity fading of the spinel cathodes. In this work, 1, 3-propane sultone (PS) is investigated as an electrolyte additive for improving the cyclability of the LiMn2O4/graphite LIB at elevated temperature. The charge and discharge measurement proves that PS can significantly enhance the cyclability of 053048-type LiMn2O4/graphite pouch cell at 60°C. Compared to the cell without additive, the capacity retention of the cell using electrolyte with 5% PS increases from 52 to 71% after 180 cycles. The improved cyclability is attributable to the modification of the solid electrolyte interface (SEI) on both positive and negative sides of the LiMn2O4/graphite cell by PS, which effectively prevents anode and cathode from structural breakdown and inhibits the electrolyte decomposition.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
eTransportation
·
2023
·
IF 11.9
Yuanzheng Long,Jialiang Lang,Kai Liu,Kuangyu Wang,Yulong Wu,Haitian Zhang,Meicheng Li,Yang Jin,Xiangming He,Hui Wu
Along with the rapid development of electric vehicles (EVs) and intermittent renewable energy, energy storage for EVs has received much attention over the past decade. Rechargeable batteries have been considered a feasible solution to utilize intermittent renewable energy with higher efficiency. Rechargeable batteries with promising safety, lifespan, low expenditure, durable components, or mature electric control systems are desired for energy storage systems . Recently, solid electrolyte-based liquid lithium (SELL) batteries have demonstrated excellent performances and great potential for energy storage applications by manipulating different cathode materials . Herein, a new type of SELL battery with Li 4 Ti 5 O 12 cathode (SELL-LTO battery) is reported. Li 4 Ti 5 O 12 is a distinctive electrode material with good rate performance, high-standard safety, moderate cost, and superior cycling stability at 280 °C, which make it an excellent cathode material for SELL batteries. The assembled SELL-LTO full cell has been cycled 100 times with an average energy efficiency of 92%. Moreover, the cell also exhibits good rate performance and can recover after being cooled and thawed.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2020
·Vol. 23
·期 5
·863-872
·
IF 1.654
Xuepeng Wu,Jianwu Zhen,Bitao Song,Shuyang Gao,Zhaohui Song,Junbin Jin
A pH-responsive amphiphilic surfactant stearic amide 3-(N , N-dimethylamino)propylamide (SAA) was synthesized and served as a thickener in aqueous solution to construct a switchable viscoelastic surfactant fluid (VES fluid). The structure of SAA was studied by 1 H NMR, and the viscoelastic behavior of VES fluid was studied in detail by rheological measurements. The viscosity of this VES fluid can be switched reversibly from low to high immediately by adjusting system pH value. Even at high shear rate (170 s −1 ) and high temperature (90 °C), excellent viscoelastic behavior of this VES fluid can be observed, which is a key performance for fracturing applications. Meanwhile, the recycled VES fluid can still maintain good pH-responsive behavior even after more than three cycles. These unique performances of this VES fluid not only enhanced our understanding of the transformation of wormlike micelles at high temperature, but also enriched a large potential of VES fracturing fluid in the development of oil and gas reservoirs.
研究领域:
化学工程
·
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Xinliang Li,Guancheng Jiang,Lili Yang,Kai Wang,He Shi,Gongrang Li,Xiongjun Wu
Various water-based drilling fluids (WBDFs) are increasingly being used in oil and gas exploitation, for more environmentally acceptable and low-cost advantages than oil-based drilling fluids (OBDFs). However, WBDFs without an effective inhibitor easily facilitate shale swelling, hydration, and dispersion and even induce well instability, which is quite disadvantageous for well drilling. Thus, high-performance and environmentally friendly shale inhibitors are desperately needed for WBDFs, especially in deep and other challenging wells. Previously, gelatin was adopted as an environmentally friendly shale inhibitor in our group. However, the shale inhibition performance was limited at a high temperature. In this work, gelatin was further modified by 2,3-epoxypropyltrimethylammonium chloride (EPTAC, denoted as GT) to introduce quaternary amine functionalities and improve shale inhibition performance. The inhibitive property of GT was systematically evaluated through the linear swelling test, hot-rolling recovery test, and Na–bentonite (Na–BT) inhibition test. Results indicated that GT displayed better inhibition performance, especially at a high temperature, than pure gelatin and other common inhibitors. GT can be strongly adsorbed on the negatively charged clay surface via electrostatic attraction and hydrogen bonding, effectively decreasing the ζ potential of Na–BT particles and suppressing the double electrical layers. Meanwhile, GT effectively encapsulated and gathered the clay particles together, therefore preventing water ingress into clay and shale. GT showed great potential as a high-performance and environmentally friendly shale inhibitor for WBDFs.
研究领域:
石油工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）