DALTON TRANSACTIONS
·
2026
·
IF 3.3
Yuke Han,Haoyu Sun,Yongzheng Zhang,Yanyun Ma,Liaokuo Gong,Yiqun Zheng
Developing efficient and CO-tolerant electrocatalysts for formic acid oxidation remains a critical challenge due to the sluggish kinetics and severe CO poisoning of Pt-based catalysts. Herein, we report a facile synthesis of urchin-like PtAg nanocrystals (PtAg NUs) with a densely branched architecture, which synergizes Ag alloying and unique morphological features to steer the reaction toward the direct pathway. When assessed for formic acid oxidation in acidic medium, PtAg NUs exhibit significantly enhanced performance compared to commercial Pt/C. Specifically, PtAg NUs show a lower onset potential (320 vs. 430 mV), a 17.6-fold higher direct pathway specific activity (0.88 vs. 0.05 mA cm−2), and a 3.9-fold higher indirect pathway specific activity (0.66 vs. 0.17 mA cm−2). Most notably, PtAg NUs demonstrate enhanced long-term stability, retaining nearly six times higher current after 3600 s (0.035 vs. 0.006 mA cm−2). In situ Raman spectroscopy confirms that both direct and indirect pathways coexist, with Ag alloying steering the reaction toward a more direct pathway-dominant process. Density functional theory reveals that Ag alloying downshifts the d-band center, weakening CO adsorption and facilitating the COOH*-mediated pathway. The enhanced performance is attributed to the synergistic interplay of Ag electronic modification and the urchin-like geometric effects. This work highlights how synergizing Ag alloying and morphological engineering can steer formic acid oxidation toward the direct pathway, offering a rational design strategy for advanced Pt-based electrocatalysts.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
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IF 5.4
Jinrui Hou,Shiji Liu,Xinyue Wu,Shujuan Zhuo,Jinyan Du
Wound healing in skin infections is frequently compromised by multi-drug-resistant bacterial colonization, persistent inflammation, and bacterial biofilm formation. To address these issues, we engineered an innovative multifunctional biomaterial (Cur@MIL-101(Cr/Ag)) which integrates potent antibacterial, anti-biofilm, and tissue-regenerative properties. This composite was constructed via a bimetallic synergistic and molecularly confined strategy, where Ag + and Cr 3+ were co-anchored within a terephthalic acid-based framework (MIL-101) through hydrothermal method, followed by the in situ encapsulation of curcumin. In vitro evaluations revealed potent broad-spectrum antibacterial activity against both Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ), along with significant inhibition of biofilm formation and minimum inhibitory concentrations (MICs) of 8 ppm and 2 ppm, respectively. In vivo, topical application of Cur@MIL-101(Cr/Ag) in a wound-infected mouse model further demonstrated complete bacterial eradication, mitigated inflammatory responses, accelerated wound closure, and promoted tissue regeneration with no observable systemic toxicity within the scope of assessment (i.e., stable body weight and non-pathological organ morphology). The therapeutic efficacy can be attributed to a synergistic triple-therapy mechanism comprising: (i) electrostatic interaction, (ii) ROS-mediated oxidative stress induction, (iii) synergistic interaction of multiple antimicrobial components (Ag⁺, Cr³⁺, and curcumin). This nanoengineered platform presents a clinically translatable strategy for precision therapy of infected wounds, combining antimicrobial robustness, biofilm penetration, and pro-regenerative functions within an integrated therapeutic system.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Xiao Wang,Tongxin Di,Wei Li,Debao Liu,Xiaohao Sun
Nowadays, Zinc (Zn)-based biocomposites as biodegradable implant materials have been recognized as a promising approach to overcome the insufficient mechanical performance of Zn matrix and to endow the Zn-based materials with biofunctionality. However, the strengthening effect on Zn-based matrix composite remains far from expectation mainly due to the poor interfacial bonding between the reinforcement and Zn matrix, and the relatively coarse grain size of the Zn matrix. Herein, we have developed a novel in situ wetting strategy to ameliorate the interfacial bonding and mechanical performance of Zn-Ag-based composites using cuprous oxide-modified graphene oxide (Cu 2 O-GO) sheets as reinforcement. The enhanced interfacial bonding between GO sheets and Zn matrix owing to the in situ generated ZnO interlayer and the ultrafine microstructure with an average grain size of 360 nm were simultaneously achieved in the hot extruded (HEed) 1 wt%Cu 2 O-GO/Zn-2 wt%Ag biocomposites. Consequently, HEed biocomposites possessed excellent tensile properties, including ultimate tensile strength (UTS) of 344.0 ± 2.4 MPa, yield stress (YS) of 314.0 ± 4.8 MPa, and elongation at failure of 15.5% ± 1.3%. Ultrafine and uniform microstructure of the HEed biocomposites resulted in a relatively uniform corrosion morphology and a degradation rate of 0.195 ± 0.004 mm y −1 in simulated body fluid (SBF) solution. The 2-fold diluted extract of the HEed biocomposites exhibited satisfying cytocompatibility with MC3T3-E1 pre-osteoblast comparable to that of Ti-6Al-4 V ELI alloys. More importantly, the synergistic effect of metallic ions, Ag-rich nanoparticles, and GO sheets contributed to the remarkable antibacterial activity of the experimental biocomposites against both S. aureus and E. coli. These results demonstrated that the 1Cu 2 O-GO/Zn-2Ag biocomposites should be anticipated as a promising biodegradable material for orthopedic applications.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Ting-yu Zhu,Wan-jun Jiang,Xin Shi,De-xiang Sun,Jing-hui Yang,Xiao-dong Qi,Yong Wang
Developing multifunctional phase change materials (PCMs) with room-temperature flexibility, moderate photothermal therapy, and antibacterial activity still remains an enormous challenge. In this study, phase change hydrated salts (Na 2 SO 4 ·10H 2 O, SSD) were packaged into a sodium alginate (SA) and polyacrylamide (PAM) double-network hydrogel with the addition of MXene@Ag (MA) nanosheets. The PAM/SA/SSD/MA hydrogels showed high enthalpy (176.0 J/g) and high size retention. Besides, the hydrogel-based sensor exhibited a wide strain sensing range, good sensitivity, and fatigue resistance (800 tensile cycles) due to the robust double-network and electrical MXene@Ag nanosheets, which can monitor subtle and intense human motion. More importantly, benefiting from the synergetic photothermal effect of MXene and Ag, the hydrogel exhibited good photo-thermal energy storage and antibacterial performances, which can be applied in moderate photo-thermal therapy to relieve pain. This research provides a potential avenue for multifunctional phase change hydrogels toward wearable thermal management and human healthcare devices.
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LIQUID CRYSTALS
·
2023
·
IF 2.2
C.C. Wang,B.L. Zhu,C.H. Yi,H.X. Chen,H. Peng,J.H. Yin,J. Wu,H.Z. Gu
Polymer dispersed liquid crystal (PDLC) films have potential applications in many aspects due to unique electrically switching properties, and thus the films with excellent comprehensive properties are highly demanded at present. In this study, aromatic polyurethane acrylate (PUA) was used as polymer-matrix, and effect of diluents [lauryl methacrylate (LMA) and isobornyl acrylate (IBOA)] content on the electrical-optical properties of PDLC films was investigated. The results indicate that increase of PUA/LMA or decrease of LMA/IBOA weight ratio increases threshold and saturation voltages (Vth and Vsat), decreases on- and off-state transmittances (Ton and Toff) and increases contrast ratio. Under optimised PUA/LMA weight ratio of 31/19 or PUA/LMA/IBOA weight ratio of 31/15/4, the Vth and Vsat of the films first increase and then decrease with increasing Ag nanowires (NWs) content, and better overall properties are achieved at 0.05 or 0.075 wt.% Ag NWs, respectively. In order to explore essential reasons for the influence of diluents and Ag NWs on the properties of PDLC films, the relationships between film properties (Vth or Vsat, Ton, Toff, and response time) and liquid crystal (LC) droplets size were analysed emphatically, and the changes of system viscosity and anchoring force between polymer-matrix and LC droplets were also discussed.
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Journal of Manufacturing Processes
·
2023
·
IF 6.2
Shuye Zhang,Jincheng Lin,Ce Wang,Peng He,Wei Wang,Xinfei Zhang,Tong Wu,Han Mei,Yue Liu,Panpan Lin,Tiesong Lin
The brazed joint of sapphire transparent ceramic and Kovar alloy was prepared using AgCuTi and AgCuTiB composite filler, and the main focus was the effect of B element on the wetting behavior, interface composition and joint mechanical performance. The reliable joint of sapphire transparent ceramic and Kovar alloy was obtained by vacuum brazing with AgCu28-6Ti-0.45B (wt%) composite filler. The typical interfacial structure of the joint brazed at 825 °C for 10 min was determined as sapphire/Ti 3 Cu 3 O/Ag(s,s) + Cu(s,s) + disperse TiB/TiFe 2 + TiNi 3 /Kovar. The results showed that the addition of B could contributed to an optimized interfacial structure via (i) in-situ forming fine TiB whisker reinforcement phase and refining the interface structure and (ii) reducing the diffusion degree of alloy side elements to inhibit the generation of brittle phase, and the maximum shear strength of the joint with AgCu28-6Ti-0.45B (wt%) reached 125 MPa more than twice the joint without B additive. On the other hand, the wetting experiment showed that the addition of B as a solid particle decreased the fluidity of the composite filler, and when the addition of B was excessive, no dense TiB whiskers were produced in the interface. This study provides ideas for the optimization and improvement of sapphire composite connection, and points out that the generation of reinforcing phase is accompanied by the reduction of fluidity, so it is necessary to reasonably control the proportion of reinforcing phase.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zhaohui Wang,Chunyu Duan,Yunqi Zhou,Fangping Wen,Qiuhong Lu,Dong Liu,Fei Wang,Xiuxia Meng
MXenes, a distinct class of two-dimensional metal carbides, are pursued to be promising potential for driving applications of lithium-ion storage with remarkable flexibility and conductivity. However, the electrochemical behavior of MXene-based anodes is far from reaching a satisfactory level due to severe interlayer stacking in MXenes, which immensely deteriorates the intrinsic conductivity in bulk and hampers the kinetic transport of Li + resulting in significant capacity fading as well as inferior rate capability. Hence, we proposed an effective tactic to significantly boost the electrochemical ability by constructing a hollow MXene/Ag composite comprised of 3D honeycomb-like MXene with Ag nanoparticles . Melamine formaldehyde (MF), the sacrificial template followed by thermal decomposition, can effectively transform 2D MXene nanosheets into a 3D hollow structure. Accordingly, rational 3D honeycomb-like MXene/Ag composite exhibits impressive rate performance and enhanced cycling stability of 310 mAh/g after 2000 cycles at 3 A/g with availably suppressing anode swelling, compared to pristine 2D MXene nanosheets, evincing the potentiality as a desirable anode for excellent electrochemical behavior lithium-ion batteries (LIBs).
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Gao-feng Wu,Jian Zhu,Guo-jun Weng,Hao-yu Cai,Jian-jun Li,Jun-wu Zhao
In this work, Au@Ag core-shell nanoparticles with different size Au TNPs as the core were synthesized through seed-mediated growth method. Various types of Au TNP@Ag core-shell nanoparticles were easily prepared by varying the amounts of AgNO 3 using the CTAC as surfactant . We have further investigated their plasmonic properties of various types of Au TNP@Ag core-shell nanoparticles. Au TNP@Ag core-shell nanoparticles have tunable localized surface plasmon resonance properties which can be controlled by volumes of AgNO 3 . The absorption peak of Au TNP@Ag core-shell nanoparticles increased from one to five and the intensity gradually increased with the increase of the volume of AgNO 3 . Moreover, by changing the core size from 62 nm to 110 nm, the characteristic absorption of Au TNP@Ag core-shell nanoparticles could be shifted from visible to infrared range. Then we analyze the influence of halide ions on the shape formation of Au TNP@Ag core-shell nanoparticles. Au TNP@Ag triangular nanoprism, Au TNP@Ag nanocube and Au TNP@Ag right bipyramid only can be obtained in the in the presence of Cl - while not other halide ions (Br - , I - ). The adsorption of Cl - and oxidative etching of Cl - /O 2 lead to the formation of single crystal Au TNP@Ag nanocube and Au TNP@Ag right bipyramid with well-defined shaped Au TNP. The present work expanded the field of gold and silver core-shell nanoparticles. More importantly, a large number of new nanomaterials have been obtained and shows promising applications in optics and sensing.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
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IF 4.4
De Zhang,Mingxin He,Chongyang Qin,Zhuoqun Wu,Minhui Cao,Dejiang Ni,Zhi Yu,Pei Liang
The unreasonable spraying and random migration of acetamiprid may cause pollution of crops, soil and water resources in the environment, resulting in threatening ecosystem and human health. However, the monitoring of acetamiprid using mass spectrum in the environment encounters challenges due to high-cost instruments and complex processing time. Herein, we fabricated a rapid and reliable SERS method based on Ag@ZIF-8@Au platforms for tracing acetamiprid residues in the environment. In this method, a MOF material named ZIF-8 is coated with silver nanoparticles and distributed internally between AgNPs and AuNPs to enhance Raman signal, which can enrich pesticide molecules into the hotspots area provided by noble material and helps avoid the oxidation of silver nanoparticles. High sensitivity (LOD of 9.027 × 10 -10 M for acetamiprid, and SERS enhancement factor of 4.3 × 10 7 ), excellent reproducibility (6.496% or 7.198% RSD for 30 random points) and superior stability (3.127% RSD for 6 weeks) were achieved using the proposed method. Acetamiprid with concentrations from 10 -4 to 10 -9 M were successfully detected by SERS method. Furthermore, the linear detection models of acetamiprid in different environment matrices (lake water, tea leaves, tea garden soil, oranges and oranges orchard soil) were established and all the correlation coefficient (R 2 ) were higher than or equal to 95%, indicating the excellent adaptability of Ag@ZIF-8@Au platform in environment. The randomly spiked concentrations of acetamiprid were also tested with good recovery values and low relative error values, further confirming the reliability of the detection method.
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高影响因子
Small
·
2023
·Vol. 19
·期 52
·2304202
·
IF 13.3
Zijun Wei,Tuo Ji,Xuemei Zhou,Jiawei Guo,Xin Yu,Hong Liu,Jingang Wang
Photocatalytic reduction of CO 2 using solar energy is an effective means to achieve carbon neutrality. However, the photocatalytic efficiency still requires improvements. In this study, polyvinylidene fluoride (PVDF) ferroelectric/piezoelectric nanofiber membranes are prepared by electrospinning. Cadmium sulfide (CdS) nanosheets are assembled in situ on the surface of PVDF based on coordination between F − and Cd 2+ , and then Ag nanoparticles are deposited on CdS. Because of the synergistic effect between localized surface plasmon resonance of Ag nanoparticles and the built-in electric field of PVDF, the CO 2 photocatalytic reduction efficiency using PVDF/CdS/Ag under visible light irradiation is significantly higher than that of any combination of CdS, CdS/Ag, or PVDF/CdS. Under micro-vibration to simulate air flow, the CO 2 reduction efficiency of PVDF/CdS/Ag is three times higher than that under static conditions, reaching 240.4 µmol g −1 h −1 . The piezoelectric effect caused by micro-vibrations helps prevent the built-in electric field from becoming saturated with carriers and provides a continuous driving force for carrier separation.
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Chemosensors
·
2022
·Vol. 10
·期 10
·423
·
IF 4.229
Chao Liu,Shenhao Wang,Xuan Dong,Qing Huang
Due to the increasing importance of food quality/safety control, there is an imminent need to develop efficient methods for the rapid detection of pesticide residues in agricultural products. Herein, we proposed a simple and rapid detection approach to the in situ detection of residual pesticides on fruit/vegetable using surface-enhanced Raman spectroscopy (SERS). Flexible and transparent SERS substrates were fabricated by transferring Au@Ag core-shell nanorods (Au@Ag NRs) arrays to silicone membranes, with the single-layer Au@Ag NRs arrays prepared by the liquid–liquid interface self-assembly method. The as-prepared SERS sensor showed excellent SERS activity and repeatability, and it could be readily pasted onto the surface of fruit and vegetables for residual pesticide detection. For the inspection of thiram in contaminated strawberries, apples, and mushrooms, the limit of detection (LOD) could reach 2 ng/cm2with high measurement recovery and reproducibility. In general, this work provides an effective way for the preparation and application of flexible and transparent SERS substrates in food-safety control.Keywords:surface-enhanced Raman spectroscopy (SERS);Au@Ag nanorods;flexible substrates;rapid detection;pesticide detection
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ACS ES&T Water
·
2022
·
IF 0
Xiaofeng Fang,Ruo Li,Ziyi Zhang,Xingran Zhang,Fang Li,Yanbiao Liu
Excellent perm-selectivity and fouling resistance are highly desirable for membrane separation in water treatment. Electrically conductive membranes have been recognized as an effective means for overcoming the permeability–selectivity trade off and enhancing the antifouling capability. However, the facile and controllable fabrication of conductive membranes with good flexibility, high conductivity, and stable separation performance remains a challenge. Herein, a novel conductive poly(vinylidene fluoride) (PVDF) ultrafiltration (UF) membrane with a thin silver nanoparticle (Ag NP) coating layer was developed via nonsolvent phase separation and green in situ reduction methods. Especially, the tannic acid/Fe3+ (TA/Fe) complex and carbon nanotube (CNT) were first blended into a PVDF UF membrane. The thin Ag NP coating layer was then in situ formed and firmly fixed on the membrane with TA to produce a conductive PVDF/TA-Ag composite membrane. The introduced Ag NP coating layer not only narrowed the pore size but also increased the electrical conductivity of the PVDF/TA membrane, which resulted in an enhanced electrostatic repulsion and remarkable humic acid (HA) rejection. The optimal membrane (i.e., PVDF/TA-Ag12) achieved an improved HA solution flux of 265 LMH/bar and an HA rejection of 97% under −2 V applied voltage, which are 2 times and 1.7 times higher than those of the uncharged membrane, respectively. Moreover, the PVDF/TA-Ag12 membrane exhibited a superior antifouling performance under an external electrical field. Meanwhile, the electrochemical reduction of Ag+ to Ag0 on the membrane matrix can effectually avoid the Ag NP leaching, keeping the stability of the separation performance. These findings provide an alternative and cost-effective method for the development of polymer conductive membranes to enhance pollutant rejection and mitigate membrane fouling.
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