Journal of Materiomics
·
2025
·
IF 9.6
Tauqeer Ahmad,Wen Lei,Burhan Ullah,Wen-zhong Lu
A series of (Sr 0.4 Ce 0.4 )TiO 3 + 4% (in mass) Sr 2 CeO 4 + x % B 2 O 3 (SCTO + 4% SCO + x % B 2 O 3 for 1≤ x ≤ 5) composites were synthesized via solid-state reaction to investigate the effects of Sr 2 CeO 4 and B 2 O 3 additives on their structural evolution and microwave dielectric properties. X-ray diffraction (XRD) and Rietveld refinement confirmed the dominant orthorhombic phase (O-phase), with SCO as a secondary phase, indicating a chemically stable composite system. HRTEM and SAED analyses further confirmed the formation of the O-phase through direct observation of the superlattice reflections. Microstructural evolution demonstrated B 2 O 3 -assisted liquid-phase sintering, reducing porosity (0.017→ 0.006) and increasing grain size (3.34 → 6.01 μm) with increasing x % (in mass). Raman spectroscopy verified octahedral tilting and Ce–O stretching, while B 2 O 3 incorporation modified the TiO 6 network via BO 3 /BO 4 interactions. The ε r decreased from 113 (SCTO) to 27 at x = 5%, while τ f improved from +213 to +12×10 –6 /°C. The reduction in ε r arises from a complex interplay of internal factors (ionic polarizability) and external factors (porosity, and density), whereas the variation in τ f is governed by compensating effects from Sr 2 CeO 4 and B 2 O 3 . Optimal microwave performance was achieved at x = 5%, with Q×f = 43,603 GHz, ε r =27, and τ f of +12×10 –6 /°C. The study demonstrates that SCO and B 2 O 3 act as effective modifiers, enhancing densification and dielectric properties in SCTO-based microwave ceramics.
研究领域:
材料科学
·
电子材料
·
功能陶瓷
·
介电材料
·
微波技术
·
固态化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Qingyuan Zhao,Wenjie Zhao,Yinghao Wu
The limited interfacial combination between CF and polymer matrix caused by the chemical inertness of CF surface greatly restricts the protective capability of carbon fiber reinforced polymer coatings (CFRPCs), which could not effectively resist the impact of external forces, especially in the severe and complicated ocean environment (like deep-sea area and splash zone). Hence, it is the crux to enhance the interface compatibility and interface strength between fiber and resin. Based on the reliable compatibility between imidazole and epoxy as well as the corrosion inhibition effects of cerium-based compounds, a kind of bi-functional metal-organic framework (MOF) called the cerium-imidazole framework (Ce-MI) was constructed on the CFs surface via in-situ growth method to improve the interface compatibility and interface strength of fiber and resin and further increase protective performance of epoxy (EP) coating under the simulated deep-sea area and splash zone . After 168 h immersion under alternating hydrostatic pressure, CF@Ce-MI/EP coating displayed impressive impermeability and anti-corrosion performance, and the interfaces of fiber/epoxy adhered firmly. After the erosion wear test, the volume loss and mass loss of CF@Ce-MI/EP were decreased by 23.77% and 14.80%, respectively, compared with CF/EP. Finally, we discussed the protective mechanism of composite coating to reveal the different processes of interface failure caused by the high pressure and the impact of solid particles , respectively.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 74
·70303-70310
·
IF 3.289
Hongxing Zhang,Yiwei Zhang,Yuming Zhou,Chao Zhang,Xiaoli Sheng,Shuo Zhao,Jiasheng Fang,Mingyu Zhang
This article reports a facile and controllable one-step method to construct Pt@hollow mesoporous SiO2 (Pt@HMSiO2) nanoparticles (NPs). To enhance the catalytic activity, cerium species were impregnated into Pt@HMSiO2 NPs, fabricating highly reactive Pt–CeO2@HMSiO2 NPs. To verify the successful synthesis of the Pt@HMSiO2 and Pt–CeO2@HMSiO2 NPs, and study the influence of CeO2 species on the catalytic performance, the as-prepared NPs were characterized by several techniques, including SEM, TEM, EDX, FTIR, XRD, BET and UV-vis analyses. In this work, the reduction of 4-NP was employed as a model reaction to test the catalytic performance. Compared to Pt@HMSiO2, the Pt–CeO2@HMSiO2 NPs show higher catalytic activity, because of the co-catalysis of CeO2 NPs. However, the excess amount of CeO2 NPs would lead to a lower catalytic activity, due to the blocking of the catalyst pore. In addition, the Pt–CeO2@HMSiO2 NPs show a high thermal stability due to the protection of the SiO2 shell. Meanwhile, we have also used the reaction of propane dehydrogenation to further verify the excellent catalytic stability of Pt–CeO2@HMSiO2 NPs. This strategy is novel, albeit efficient, and can be extended to the preparation of other nanocatalysts.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 6
·1193-1202
·
IF 3.286
Sun Xiaodong,Guo Jie,Yu Tao,Du Yingxiang,Feng Zijie,Zhao Shiyuan,Huang Zhifeng,Liu Jie
Magnetic microparticles (MMPs) have been extensively studied and aroused considerable interest in separation science owing to their superior characteristics. In this paper, a novel coated capillary with carboxymethyl-β-cyclodextrin-functionalized magnetic microparticles (CD-MMPs) as stationary phase was constructed and then applied to establish an open-tubular capillary electrochromatography enantioseparation system. The preparation of the CD-MMP-coated open-tubular column was very convenient because the coating of the magnetic microparticles onto the capillary column could be easily manipulated by an external magnetic field. The preparation conditions of the coated capillary such as magnetic field intensity and coating time are discussed in detail. The new constructed CD-MMP capillary system was applied to separate enantiomers of several racemic drugs. Compared to the uncoated capillary system, obviously preferable separations of tested enantiomers were obtained. Several important parameters affecting the enantioseparation, such as CM-β-CD concentration, running buffer pH, organic solvent, and applied voltage, were systematically optimized. Furthermore, satisfactory repeatability and chemical stability of this new CD-MMP capillary system were achieved in the experiment.
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研究领域:
分析化学
·
分离科学
·
药物分析
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 35
·13967-13978
·
IF 3.069
Qiang Ning,Huaike Zhang,Yurong He,Zhiqiang Chen,Suyao Liu,Jie Ren
Small Pt particles (about 1.2 nm) were highly dispersed on ZSM-22 zeolites via a strong electrostatic adsorption (SEA) method and exhibited a promotion effect on the catalytic performance in n-dodecane isomerization in comparison with the conventional catalyst. Several promoters (Ce, La, and Re) were introduced to further improve the aggregation resistance of the small Pt particles. A series of characterization including H2-TPR, XPS and STEM as well as DFT calculations provided solid evidence that the strong interaction between Pt and promoter species not only effectively hinders the Pt aggregation but also alters the electronic state of the Pt sites. Moreover, Ce and La promoters also lead to a slightly improved amount of B acid sites determined by Py-FTIR. Thus, improved activity and selectivity were achieved on a Ce-modified catalyst due to the better balanced bifunctionality between the slightly increased acidity of zeolites and electron-deficiency of Pt. The electron-rich Pt sites are responsible for the significant increase of CH4 selectivity and the decrease of total isomer selectivity in n-dodecane isomerization. In addition, a high-temperature reduction test revealed the higher isomerization activity and selectivity (about 10% higher than the unmodified catalyst) of the Ce-modified catalyst owing to the strong bond of Pt–O–Ce, further confirming the positive effect of the Ce promoter on the sintering resistance of small Pt particles.
研究领域:
催化化学
·
材料科学
·
计算化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2026
·
IF 6.5
Zhanmin Zhu,Yu Chen,Shangqing Xi,Xiaojia Wang
Biomass chemical looping co-gasification (BCLCG) offers a promising route for converting renewable biomass into controllable gaseous carbon precursors, though precise regulation of carbon distribution remains challenging. Here, we propose a carbon precursor engineering strategy via co-gasification of pine sawdust (PS) and Chlorella (CH) using Ce-doped LaFeO 3 (LFO) perovskite oxygen carriers. Ce incorporation significantly enhances lattice oxygen mobility, oxygen vacancy concentration, and structural stability. Among the samples, La 0.7 Ce 0.3 FeO 3 (L 0.7 C 0.3 FO) exhibits optimal redox performance, maintaining a high specific surface area (4.13 m 2 /g) and stable mesoporous structure after reaction while suppressing sintering-induced pore collapse. A pronounced synergistic effect is observed during PS-CH co-gasification: hydrogen-rich volatiles and intrinsic alkali/alkaline earth metals from CH promote tar cracking and char conversion, facilitating carbon redistribution toward gaseous products. At the optimal blending ratio (PS/CH = 1:2), the carbon precursor formation (CPF = CO + CH 4 + C 2 -C 4 ) reaches 0.362 Nm 3 /kg with a total gas yield of 1.268 Nm 3 /kg, and carbon utilization efficiency (CUE) reaches 67.6%. Process optimization reveals that carbon precursor formation is governed by lattice oxygen supply, steam participation, and thermal conditions. The optimal conditions (900 °C, oxygen carrier-to-biomass ratio of 1.0, steam flow rate of 0.3 mL/min) enhance CUE. This work reinterprets BCLCG as a carbon precursor engineering platform rather than conventional syngas production. The integration of Ce-doped perovskite oxygen carriers with multi-source biomass enables precise carbon distribution regulation and provides a viable pathway for efficient biomass conversion into carbon-oriented gaseous products.
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2026
·
IF 5.5
Yingjue Chen,Yan Chu,Shiwei Fang,Xiaoqi Zhang,Jie Zheng,Wubin Du,Wengang Cui,Lingchao Zhang,Xin Zhang,Yaxiong Yang,Mingxia Gao,Hongge Pan
NaAlH4 suffers from high kinetic barriers, causing high dehydrogenation temperatures, sluggish kinetics, poor reversibility, and low direct synthesis efficiency. Herein, a metallic Al−Ti−Ce alloy ribbon (Ti:Ce = 1:1, total 6 wt %) with a refined Al matrix (∼405 nm) and uniformly dispersed nanoscale Ti2Al20Ce and Al3Ti phases (200−360 nm) was fabricated by arc melting and melt-spinning. Used directly as the Al source, this ribbon enabled successful synthesis of NaAlH4 by ball-milling with NaH under 50 bar H2 for 36 h. The resulting composite delivered a dehydrogenation capacity of 4.73 wt % from 107.4 to 182.1 °C and a capacity retention of 91.98% over 15 cycles. The Ti−Ce synergy refines Al grains and disperses catalytic phases while also improving the hydrogenation and dehydrogenation kinetics of NaAlH4 and suppressing Al agglomeration, collectively ensuring high reactivity and sustained reversibility of the system. This work presents an effective design strategy for an integrated precursor that combines a bimetallic catalyst and an Al source, offering an alternative approach for optimizing the synthesis and hydrogen storage performance of the NaAlH4 system.
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Xianyao Yan,Xinhui Ji,Jiawei Chen,Rongyue Sun,Huaqiang Chu
The sorption-enhanced steam gasification of biomass using CaO-based materials is considered a promising method for H 2 production, while the presence of H 2 S in the syngas results sulfur poisoning of the materials. In this work, DFT calculations were combined with experimental verification to elucidate the mechanism of H 2 S resistance and structural stability of Ce-doped CaO material. The theoretical results reveal that Ce-doping significantly modulates the surface electronic structure, and Ce-doped CaO surface exhibits less negative H 2 S adsorption energies and higher activation barriers for the initial dissociation steps compared with pristine CaO, thus the onset of the sulfidation reaction is inhibited. Furthermore, the formation of oxygen vacancies is energetically less favorable on Ce-doped CaO surfaces, which is a prerequisite for sulfidation reaction. Even under sulfur-poisoning conditions, the Ce-doped CaO retains superior CO 2 adsorption, and the adsorption of Ca 4 O 4 clusters demonstrates that a robust chemical anchoring effect was introduced by Ce-doping. Experimental results from 20 cycles of steam gasification of high‑sulfur Enteromorpha prolifera validate these theoretical findings, and Ce-doped CaO maintains high H 2 production and CO 2 capture performances with minimal sulfur-poisoning deactivation.
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2026
·Vol. 12
·期 2
·128
·
IF 6.4
Jiahan Guan,Wei Wang,Xiaodong Wu,Yu Xia,Bingyan Shi,Shibei Liu,Lijie Xu,Ruiyang Zhang,Yunlong Sun,Yuqian Lin
A targeted modification approach involving the synthesis of Ce/C co-doped TiO2aerogels (CeCTi) via a sol–gel method combined with supercritical CO2drying and subsequent heat treatment is employed to enhance the photocatalytic CO2reduction performance of cost-effective and stable TiO2aerogels. The results demonstrate that the CeCTi exhibits a pearl-like porous network structure, an optical band gap of 2.90 eV, and a maximum specific surface area of 188.81 m2/g. The black aerogel sample shows an enhanced light absorption capability resulting from the Ce/C co-doping, which is attributed to the formation of oxygen vacancies. Under simulated sunlight irradiation, the production rates of CH4and CO reach 27.06 and 97.11 μmol g−1h−1without any co-catalysts or sacrificial agents, respectively, which are 82.0 and 5.7 times higher than those of the pristine TiO2aerogel. DFT reveals that C-doping facilitates the formation of oxygen vacancies, which introduces defect states within the calculational band gap of TiO2. The proposed photocatalytic mechanism involves the light-induced excitation of electrons from the valence band to the conduction band, their trapping by oxygen vacancies to prolong the charge carrier lifetime, and their subsequent transfer to adsorbed CO2molecules, thereby enabling efficient CO2reduction, which is experimentally supported by photoluminescence measurements.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Jialong Shi,Haijie Chen,Sijia Chen,Xiaolong Liu,Dapeng Feng,Zhiwen Zheng,Dan Qiao
The development of advanced lubrication technologies is essential for enhancing energy efficiency, reducing environmental impact, and improving mechanical durability. In this study, a high-performance lubrication system tailored for diamond-like carbon (DLC) coatings is designed, employing graphene oxide-functionalized cerium-based metal–organic framework (GO@Ce-MOF) composites as nano-additive in an aqueous polyethylene glycol (PEG) solution. The GO@Ce-MOF hybrids were synthesized via electrostatic self-assembly, demonstrating outstanding tribological characteristics with an exceptionally low coefficient of friction (COF ≈ 0.004) and minimal wear on DLC substrates. Post-friction analysis confirmed that the structural integrity of the DLC coating remained unimpaired, with wear predominantly localized on the opposing steel balls. A bilayer tribofilm, approximately 45.5 nm thick and composed of metal oxides and amorphous carbon, formed on the steel surface, facilitating a transition to carbon/carbon friction interfaces. The rod-like architecture of the cerium-based metal–organic framework (Ce-MOF), encapsulated by layered graphene oxide (GO), synergistically contributed to reduced rolling friction and provided carbonaceous precursors for in situ tribofilm formation. This solid–liquid lubrication synergy enabled superlubricity and near-zero wear. The findings demonstrate a novel strategy for promoting in situ growth of carbonaceous tribofilms on dual friction interfaces, offering transformative potential for sustainable lubrication of advanced coating materials.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2026
·
IF 2.7
Chen Yifei,Sheng Shuqi,Liu Yuqi,Li Qiaoxia,Sun Jiazhe,Zhong Mingqiang,Qu Baiyou,Hu Caixia,Zhao Zhengping
Salen-type Schiff bases, formed by the condensation of salicylaldehyde with diamines, serve as versatile tetradentate N 2 O 2 chelating ligands owing to their tunable electronic and steric structures. Their corresponding metal complexes have been extensively applied as highly efficient and stable catalysts in diverse transformations, particularly in ring-opening polymerization (ROP) reactions. In this study, two structurally related propanediamine-derived bis-Schiff base ligands were synthesized from 3,5-di-tert-butylsalicylaldehyde and corresponding diamines, along with a series of Ce-, Fe-, and Co-Salen complexes. A thorough investigation was conducted on their catalytic performances and influencing factors in the ROP of rac-lactide. The results indicate that the catalytic performance of these Salen-metal complexes is dual-influenced by both the ligand structure and the nature of the metal center. Among the investigated catalysts, the Ce-Salen complex exhibited higher catalytic activity and comparatively favorable M n and dispersity values compared to its Fe- and Co-based counterparts under identical conditions. This comparative study provides valuable insights into the metal-center effects in Salen-type catalysts and offers rational guidance for designing efficient catalysts for PLA synthesis.
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Qianyi Li,Zuopeng Li,Tianyu He,Bowen Zhu,Caiming Xiong,Sanbing Zhang
Conducting multi-mode detection of multiple targets simultaneously on a single platform can significantly enhance the accuracy and flexibility of the detection process. Herein, a fluorescence-colorimetric dual-mode sensing platform was constructed by in-situ coating polydopamine (PDA) on Cu/Ce multivalent metal-organic frameworks (Cu/Ce-MOFs). The obtained Cu/Ce-MOFs@PDA exhibits excellent fluorescent properties and multienzyme-like nanozymes activity (including mimics oxidase, peroxidase, phosphatase, and laccase), facilitating dual-mode detection of pesticides, phenolic pollutants, and biomolecules. Particularly, the excellent detection performance is attributed to the synergistic Ce 4+ /Ce 3+ -Cu 2+ /Cu + redox cycling and the interfacial electron modulation of polydopamine. In addition, the sensing platform demonstrates excellent signal reproducibility, remarkable anti-interference capabilities and strong applicability to real samples, with a recovery ranging from 84.3% to 118.8%. This work demonstrates a generalizable approach for constructing multifunctional bimetallic MOFs-based nanozymes, enabling the development of integrated analytical platforms with multi-mode signal outputs for environmental and biosensing applications.
✓ 已验证
DOI
PubMed
高影响因子
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