CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 33
·7896-7902
·
IF 5.16
Xuejiao Yang,Yuefei Wang,Wei Qi,Bohao Yang,Xiao Liu,Lei Zhang,Jiangyue Liu,Rongxin Su,Zhimin He
Inspired by natural enzymes, hierarchical catalytic supramolecular nanostructures were developed by the co-assembly of hemin and glucose oxidase (or Au NPs) with the photosensitive ferrocene–tyrosine (Fc-Y) molecule. Illuminated by white light, the Fc-Y molecules are polymerized and co-assemble with hemin into truncated polyhedrons. The Au NPs grew in situ at the surface of the co-assembled polyhedrons, achieving ordered supramolecular nanostructures. Because the Au NPs can serve as an artificial glucose oxidase and the hemin could act as a peroxidase mimic, the supramolecular hybrid nanostructures were used to mimic natural enzymes and catalyze the glucose conversion cascade reaction. The hybrid Au NPs@Fc-Y&hemin polyhedrons showed superior catalytic activity, good reusability, and maintained the catalytic activity over a wide temperature and pH range. The study demonstrates a feasible strategy to construct hierarchical co-assembled supramolecular nanostructures as multi-enzyme mimics, with potential applications in biocatalysis and biosensing. Graphical Dual-enzymatic mimics : Based on photoinduced hierarchical co-assembly, diverse dual-enzymatic mimics, such as nanospheres, surface folded nanoparticles, and truncated polyhedrons, are constructed. The formed nanostructures exhibit superior catalytic activity towards cascade reactions, with potential applications in biocatalysis and biosensing.
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高影响因子
Science China-Materials
·
2026
·
IF 7.4
Li Qing,Tang Jiayuan,Yang Yuhan,Chai Jun,Zhang Xiao,Shao Mingfei,Shen Hangjia
Pore-tuning engineering has been proven as an effective strategy in catalyst design for energy storage and conversion. Herein, we propose a rhombic dodecahedral iron and nitrogen co-doped carbon-based material (Fe-N-C) with hierarchical micro-mesoporous structures using mesoporous silica as the pore template and iron launch vehicle. The as-prepared catalysts (m-Fe/NC) exhibit much boosted ORR activity with half-wave potential of 0.81 V and 0.88 V in acidic and alkaline media, respectively. Furthermore, a superior specific capacity of 815 mAh g Zn −1 and stable cell voltage of 1.31 V is achieved at current density of 10 mA cm −2 when using m-Fe/NC as cathode for zinc-air batteries (ZAB). Advanced characterization techniques and theoretical calculations reveal that the introduction of mesopore structure not only improves the active site exposure, but also the proper curvature-induced strain effect from mesoporous concave surface enhances the intrinsic activity. This work provides significant insights for future development of innovative nanoporous electrocatalysts.
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CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 11
·18888-18894
·
IF 3.83
Yiqian Guo,Wenting He,Hongbo Guo
Ceramic materials for the thermal barrier coating (TBC) application of Gd 2 Zr 2 O 7 (GZO), (Gd 0.94 Yb 0.06 ) 2 Zr 2 O 7 (GYb 0.06 Z), (Gd 0.925 Sc 0.075 ) 2 Zr 2 O 7 (GSc 0.075 Z), (Gd 0.865 Sc 0.075 Yb 0.06 ) 2 Zr 2 O 7 (GSc 0.075 Yb 0.06 Z), and (Gd 0.8 Sc 0.1 Yb 0.1 ) 2 Zr 2 O 7 (GSc 0.1 Yb 0.1 Z) were successfully synthesized by chemical co-precipitation. The effects of the doping of Sc 2 O 3 and Yb 2 O 3 on the phases, thermo-physical and mechanical properties of the ceramics were investigated. The results show that both Yb 2 O 3 and Sc 2 O 3 doping promoted the phase transition of GZO from pyrochlore to fluorite. All the Sc 2 O 3 -doped samples exhibited enhanced fracture toughness, as compared to the undoped sample. Furthermore, the GSc 0.075 Yb 0.06 Z sample revealed a thermal conductivity of ~0.8 W/mK at 1200 °C, which was nearly 30% lower than that of the undoped sample. The associated mechanisms related to the effects of the doping on the thermophysical and mechanical properties are discussed.
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ACS Applied Polymer Materials
·
2026
·Vol. 8
·期 15
·12390-12401
·
IF 5.2
Li Na,Meng Xiaoyu,Wu Tianyu,Wei Xue-Wei,Zhou Qiong,Ye Hai-Mu
Poly(vinylidene
fluoride) (PVDF) has garnered extensive attention
for flexible applications, yet its practical utilization is severely
hampered by its limited piezoelectric response, the demand for high-voltage
poling, and the difficulty in controlling the oriented amorphous fractions
(OAFs). Herein, we demonstrate a thiourea (TU) cocrystallization strategy
to efficiently regulate the phase evolution in PVDF toward superior
piezoelectricity. PVDF/TU complexes are fabricated via electrospinning,
followed by TU removal to obtain coalesced PVDF ( c -PVDF). The c -PVDF film exhibits a high crystallinity
of 61.8% and a dominant content of polar β/γ-crystal phases.
More importantly, the c -PVDF film is capable of generating
a substantial fraction of OAFs and distinct dipole orientation under
moderate-to-low electric fields (<70 MV/m), far below conventional
poling voltages. Systematic structural characterizations reveal that
OAF content evolves nonmonotonically with poling field and plays a
decisive role in piezoelectric performance. The optimized c -PVDF exhibits a high piezoelectric coefficient ( d 33 ) exceeding 70 pC/N at a poling field of only
55 MV/m, displaying low-field high- d 33 characteristics compared to state-of-the-art PVDF-based piezoelectric
materials. Furthermore, the poled c -PVDF film exhibits
outstanding voltage outputs toward finger bending and airflow stimuli,
demonstrating promising potential in flexible sensing. This work establishes
an energy-efficient route toward high-performance piezoelectric PVDF,
and provides mechanistic insights into OAF-governed piezoelectric
enhancement, which will facilitate the rational design of high-performance
electroactive polymer materials.
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ACS Applied Nano Materials
·
2026
·
IF 5.8
Meichao Gao,Yuting Ma,Yingfei Sun,Juntao Hao,Xiquan Zhang,Qiuju Zheng,Changlong Sun,Yunyun Gong
Heterojunction construction offers an effective means to modulate band structures and enhance charge separation in photocatalysis. The aim of this work is to develop a high-performance photocatalyst for CO2 reduction by combining the advantages of 1D and 2D materials. To achieve this, a hierarchical S-scheme heterojunction comprising 1D SiC nanowires and 2D BiOBr nanosheets is designed and fabricated via a facile hydrothermal route as the key method. The formation of the S-scheme heterojunction facilitates efficient spatial charge separation while preserving the strong reduction and oxidation potentials of the respective components. As a result, the SiC/BiOBr composite exhibits significantly enhanced visible-light absorption and markedly suppressed photogenerated carrier recombination compared to pristine BiOBr. Under simulated solar irradiation, the optimal catalyst achieves a CO evolution rate of 715.98 μL·g–1·h–1, approximately six times and five times higher than those of pure SiC and BiOBr, respectively. Furthermore, the heterojunction demonstrates excellent stability over extended photocatalytic CO2 reduction cycles. In conclusion, this work provides a promising strategy for constructing S-scheme binary heterostructures toward cooperative applications in environmental remediation and solar fuel conversion.
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CATALYSIS LETTERS
·
2026
·Vol. 156
·期 7
·205
·
IF 2.5
Zhang Yikang,Zhang Yihu,Sun Min,Li Bin,Wang Haiyan,Li Zijiong
The oxygen reduction reaction (ORR) serves as the core cathodic reaction for fuel cells. However, the sluggish ORR kinetics and high cost of Pt-based catalysts severely restrict the commercialization of fuel cell devices. Herein, a facile in-situ synthetic strategy is developed to fabricate carbon dot-supported cobalt (CD@Co) electrocatalysts, in which carbon dots (CDs) act as both reducing agent and structural modulator. With the aim of optimizing catalytic activity and stability, the effects of CDs dosage on Co dispersion, nitrogen configuration and ORR performance are systematically investigated. The optimized CD@Co-0.12 exhibits a half-wave potential of 0.89 V (vs. RHE) and a limiting current density of 4.47 mA·cm − 2 , outperforming commercial 20% Pt/C (E 1/2 = 0.85 V). Kinetic analysis reveals a Tafel slope of 90.65 mV·dec − 1 and a near-four-electron transfer pathway ( n ≈ 3.78). After 5000 CV cycles, only negligible potential decay is observed, demonstrating excellent stability. This work provides a low-cost and scalable strategy for designing high-performance non-precious metal ORR catalysts. Graphical Carbon dot regulated CD@Co non-precious electrocatalyst toward efficient alkaline oxygen reduction reaction
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 1
·118781
·
IF 6.3
Leichao Cao,Yizhou Xiao,Yutang Liu,Chunchun Li,Guangzu Zhang,Fei Li
In this study, a compositional optimization strategy was formulated within the 85BaTiO 3 -15Na 0.5 Bi 0.5 TiO 3 (85BT-15NBT) system to attain X9R-type stability while maintaining a comparatively high dielectric response. Nb/Y co-doping was introduced to adjust the phase structure and dielectric behavior of the parent 85BT-15NBT. Rietveld refinement revealed a structural evolution from a tetragonal P 4 mm symmetry to pseudocubic Pm 3 ˉ m symmetry. X9R requirement, with a room-temperature permittivity of 1496 and a dielectric loss of 1.82%, was achieved. CaZrO 3 modification increased the relative permittivity to 1679 along with a dielectric loss of 1.50% without compromising the temperature stability. High-temperature impedance and Arrhenius analyses revealed improved high-temperature insulation and CZ-induced changes in the local defect and chemical environment. These findings illustrate that compositional optimization is effective for designing lead-free X9R dielectric ceramics for high-temperature MLCC applications.
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Molecular Catalysis
·
2026
·
IF 4.3
Shuo Wang,Jing Ding,Yichang Pan,Hui Wan,Guofeng Guan
Chitosan-supported pyridinium ionic-liquid catalysts were prepared. • Halide, DD, and ionic-liquid loading effects were systematically studied. • Br-IL2Cs-90DD gave 95% cyclic carbonate yield at 0.5 MPa CO 2 . • The catalyst retained high activity over five consecutive cycles. • DFT revealed cooperative activation by N⁺, Br⁻, and chitosan –OH sites. Developing recyclable heterogeneous organocatalysts with clearly identifiable cooperative active sites is important for the mild and solvent-free cycloaddition of CO2 with epoxides. Herein, a chitosan-supported pyridinium ionic-liquid catalyst was constructed by covalently immobilizing bifunctional ionic-liquid moieties onto renewable chitosan through Schiff-base chemistry. The catalyst integrates pyridinium cations, Br⁻ nucleophiles, Schiff-base linkages, and chitosan hydroxyl groups into a cooperative heterogeneous catalytic environment. Among the investigated structural variables, the bromide-containing catalyst prepared from high-deacetylation chitosan (Br-IL2Cs-90DD) showed the best performance, affording 96% epichlorohydrin conversion, 99% cyclic carbonate selectivity, and 95% cyclic carbonate yield at 80 °C and an initial CO 2 pressure of 0.5 MPa within 4 h under solvent-free conditions. This performance is competitive with representative heterogeneous ionic-liquid and biomass-supported catalysts operating under mild-pressure conditions. The recovered catalyst retained 94% conversion, 98% selectivity, and 93% yield after five consecutive cycles, and post-reaction FT-IR/XPS characterization further supported the structural retention of the immobilized ionic-liquid catalyst. Characterization and density functional theory calculations support the proposed cooperative catalytic mechanism, in which the pyridinium cation and Br⁻ promote epoxide activation and ring opening, while chitosan hydroxyl groups help stabilize alkoxide and carbonate-related species. This work provides a biomass-derived immobilized ionic-liquid catalyst for metal-free CO 2 -to-carbonate conversion and offers molecular-level insight into cooperative active-site design. Download: Download high-res image (271KB) Download: Download full-size image
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Pharmaceutics
·
2026
·Vol. 18
·期 7
·859
·
IF 6.9
Xin Shen,Mian Zhao,Muhammad Hamza,Wen-Ting Wu,Jing Liu,Zi-Lu Guo,Zhi-Yu Guan,Zhe Li,Wei-Feng Zhu
Background: As a novel drug delivery vehicle, transfersomes (TFSs) have great deformability, good biocompatibility, and biodegradability, which can significantly improve drug delivery efficiency. However, their application is limited by their poor stability and vulnerability to leaks.Methods: This paper prepared and assessed the stability of transfersomes co-loaded with Pueraria total flavonoids (PTFs) and tanshinone (TAN), known as PTF/TAN-TFSs, in order to overcome this constraint.Results: The findings showed that the co-loaded system (PTF/TAN-TFSs) had better structural stability than the single-loaded systems (PTF-TFSs and TAN-TFSs), with drug leakage rates decreased by roughly 5% and 7%, respectively, and a more uniform size distribution with a particle size of 44.52 ± 0.47 nm and a PDI of 0.22, while the single-loaded systems had PDI values larger than 0.3. The co-loaded system showed a better sustained-release profile than the suspension with a 15.28% decrease in the maximum cumulative release of the poorly soluble component Tan IIA. Additionally, the co-loaded system demonstrated enhanced solubilization capability, making the poorly soluble component TAN more soluble by 89.52 times compared to the free medication and by 1.97 times compared to the single-loaded system. Furthermore, the co-loaded system significantly improved the intestinal absorption of Tan IIA, increasing the Papp and Ka values in the ileum segment by 2.02-fold and 1.80-fold, respectively.Conclusions: The stability of the system was successfully improved by co-loading many components with varying hydrophobicities. This method provides a fresh way to enhance transferosome stability, broadening their application in the field of drug delivery.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Xingyu Liu,Chan Dong,Jingang Zhang,Jingxia Qian,Jean-Marie Basset,Dongping Sun,Lu Zhou
A fluorine-free hydrophilic coating was fabricated on polytetrafluoroethylene (PTFE) membranes using sodium dodecylbenzenesulfonate (SDBS), nano-silica (SiO 2 ), and ethylene-vinyl alcohol copolymer (EVOH) through a simple immersion–drying process. The modification aimed to improve membrane wettability, permeability, and chemical stability. FTIR, XPS, SEM, and AFM analyses confirmed the formation of a uniform organic–inorganic composite coating. AFM further showed that the characteristic granular morphology and surface roughness changed little after immersion in acidic, alkaline, and oxidative solutions, indicating good nanoscale structural stability under harsh conditions. At the optimal composition (SDBS:SiO 2 :EVOH = 2:1:1), the water contact angle decreased from 124.8° for pristine PTFE to 60.6°, while the pure water flux reached 3727.99 L m −2 h −1 . The modified membrane also exhibited high flux recovery after bovine serum albumin fouling, with a flux recovery ratio of 92.3%. In oil–water separation tests, the membrane achieved separation efficiencies above 98% and maintained stable performance during three consecutive filtration cycles. In addition, stable wettability and permeation performance were retained after 1-week immersion in solutions ranging from pH 1–14. The results indicate that the EVOH-stabilized SiO 2 /SDBS coating provides an effective, PFAS-free, and scalable strategy for preparing durable hydrophilic PTFE membranes under harsh operating conditions.
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ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Pengxiang Wang,Kaiqiang Wang,Zhihui Wu,Xujian Qiu,Limin Cao,Jianxin Sui,Xiudan Wang,Hong Lin
Background Reliable quantification of nitrite in complex food matrices using surface-enhanced Raman scattering (SERS) remains challenging due to signal drift and SERS substrate variability. Conventional internal standard (IS) strategies often occupy plasmonic hot spots, limiting analyte accessibility and compromising detection performance. Results Herein, we report a size-complementary modular self-calibrated co-assembled (SCCA) SERS platform that integrates large gold nanoparticles (LAuNPs) with Au@Prussian blue (PB) core-shell nanospheres via interfacial self-assembly. The Au@PB nanospheres physically occupy the interparticle gaps of LAuNP arrays, providing both structural uniformity and a built-in Raman reference band at 2128 cm −1 for ratiometric self-calibration without competing for plasmonic hot spots and compromising SERS sensitivity. The resulting SCCA substrate exhibits dense electromagnetic hot spots and good reproducibility, achieving quantitative nitrite detection through an acid-promoted S-nitrosation reaction with 2-thiobarbituric acid that generates a characteristic Raman band at 685 cm −1 . The method delivers a linear range of 0.15–2 mg/L, a limit of detection of 0.0368 mg/L, and excellent anti-interference tolerance in real food samples including cured fish, sausage, and pickled cucumber. The substrate retains 91.51% signal intensity after 60 days, confirming outstanding stability. Significance and novelty This work presents a universal strategy for constructing self-calibrated SERS substrates by spatially decoupling calibration elements from plasmonic hotspots. The SCCA design eliminates the intrinsic conflict between sensitivity and quantitative reliability, offering a modular and scalable approach for ratiometric SERS analysis.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.9
Huan Song,Le Song,Fangzhou Wu,Yonglei Xing,Xiaoyong Jin,Gang Ni,Xin Wang
Utilizing bimetallic synergy presents a promising approach for creating exceptionally effective catalysts for peroxymonosulfate (PMS) activation. In this study, a Co Fe bimetallic catalyst (Co8Fe1-P1-NC) was constructed by regulating the Co/Fe doping ratio and further introducing phosphorus doping. During PMS activation for phenol (Ph) degradation, Co8Fe1-P1-NC exhibited outstanding catalytic performance. Under the optimized conditions, the Co8Fe1-P1-NC/PMS system achieved complete removal of Ph within 2.5 min, with an apparent rate constant as high as 2.058 min −1 and a total organic carbon (TOC) removal efficiency of up to 80%. Combined results from quenching experiments, electron paramagnetic resonance (EPR), in situ Raman spectroscopy, electrochemical measurements, and premixing tests demonstrated that O 2 •− , 1 O 2 , high-valent metal species, and electron-transfer pathways collectively contributed to Ph degradation. Theoretical calculations indicate that Fe and P doping make the PMS adsorption energy more negative and elongate the O O bond (l O–O ), thereby facilitating PMS activation on the catalyst. Co8Fe1-P1-NC also showed excellent broad-spectrum degradation capability toward various phenolic pollutants, achieving complete removal within 3 min. These findings indicate that the combined regulation of metal active sites and electronic structure through bimetallic synergy and nonmetal doping can significantly enhance PMS activation efficiency, providing a new avenue for the design of high-performance catalysts.
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