CATALYSIS TODAY
·
2018
·
IF 4.667
Houlin Wang,Shuting Luo,Xinghao Li,Wei Liu,Xiaodong Wu,Duan Weng,Shuang Liu
Developing catalysts with high cost-efficiency, good oxidation activities and strong thermal resistance is an ongoing task. Herein, we present the design and synthesis of confined catalysts with Ag protected by alumina. Thermal treatment at 800 °C for 10 h caused neither silver loss nor deactivation of this catalyst. Instead, nano-particles of Ag formed because of the heat/O 2 -derived ripening. These highly dispersed silver species and the catalyst’s mesoporous structure worked in tandem to achieve good catalytic performance for oxidation reactions, which made the aged sample a good candidate as CO elimination and gasoline particulate filter catalysts.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2019
·
IF 4.384
Wenying Guo,Sihai Zhang,Nengwu Zhu,Deliang Luo,Pingxiao Wu
In this study, a strategy was developed to directly recover high-purity Ag and other metals (especially Cu) from WECs to reduce the leaching of precious metals and promote the leaching of Cu and other metals. The results of SEM, EDS, XRD and ICP-OES clearly suggested that Ag and Cu were effectively released from WECs below 0.15 mm size, which contributed to the regulation of metals crystal types. The zero-valent copper from WECs was changed by roasting to form CuO and Cu 2 O, and the suitable samples of roasting at 400 °C for 3 h were confirmed experimentally. After the leaching processing under H 2 SO 4 (1 M) and H 2 O 2 (30%), the roasted particles were directly obtained, including Ag with 99.53 wt.% purity and more than 99.99% recovered, and Cu, Sn, Ni and Zn extracted by 99.67%, 90.71%, 73.05% and 99.32%, respectively. However, the unroasted particles would generate lower grade of Ag because other metals (e.g. Cu, Sn, Ni and Zn) were difficult to be leached from WECs. The leaching solution primarily included Cu ions (98.3%) and a little of the nickel (0.83%) and tin (0.86%) ions, which could recover copper by evaporation crystallization to form CuSO 4 (99.48 wt. %). The reaction mechanism of the process could be concluded that the copper state was transformed by mechanical separation and roasting to promote the leaching of various metals from Ag.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 19
·195601
·
IF 3.953
Zhongming Jiang,Jiamin Zhang,Kaizhao Wang,Tianyou Chen,Jiuwei Zhao,Kaijun Wang,Jin Hu
A mild strategy for fabricating nanoporous silver (np-Ag) pieces was reported via preparation of Ag–Ga alloys in relatively low temperature and subsequent electrochemical dealloying in nitric acid (HNO3) aqueous solution. After selectively etching Ga out of the Ag–Ga alloy, a typical three-dimensional (3D) bicontinuous nanoporous structure with a pore size of ∼67.21–159.33 nm was observed. A series of studies have shown that the addition of sodium dodecyl sulfate (SDS) results in minimum pore size. The coarsen exponent (n) is 1.61, and the activation energy was calculated to be 27.04 kJ mol−1. The ζ'-AgGa alloy prepared at low temperature can be used as the precursor for the preparation of fine np-Ags, and this method provides a new strategy for the industrial production of dealloyed np-Ag.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF WATER AND HEALTH
·
2017
·Vol. 15
·期 3
·341-352
·
IF 1.041
Wu Huiqing,Huang Jing,Liu Yuejun
An anti-fouling hybrid membrane was prepared by incorporating Ag-SiO 2 nanohybrid into a polysulfone (PSf) matrix. The addition of Ag-SiO 2 can significantly improve the hydrophilicity, separation property, anti-fouling ability, and especially anti-bacterial activity of hybrid membranes. The optimum performance of the Ag-SiO 2 /PSf hybrid membrane is achieved when the concentration of Ag-SiO 2 is as low as 0.45 wt%. Compared with PSf membrane and SiO 2 /PSf hybrid membrane, the Ag-SiO 2 /PSf hybrid membrane displays the best overall properties. The excellent performance of the Ag-SiO 2 /PSf hybrid membrane can be attributed to the well-tailored structure and unique property of Ag-SiO 2 nanohybrid, where nanosized Ag (∼5 nm) can densely and uniformly disperse on the surface of silica spheres. The obtained membrane could be a promising material for water treatment.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Pu Chen,Dong Li,Yuan Feng,Shijie Zhou,Jing Tang,Bowen Chu,Dongsheng Tang,Jiawen Hu
A flexible Ag NWs/WO 3- x /Au memristor is successfully fabricated. • The device achieves an ultra-low energy consumption of 3.89 fJ per pulse. • The device achieves a competitive ECG recognition accuracy of 94.3%. • The device exhibits robust mechanical flexibility. The simultaneous achievement of high mechanical flexibility, ultra-low energy consumption, and high recognition accuracy remains a major challenge for wearable intelligent devices. Here, we report a flexible memristive device capable of emulating biological synaptic functions, fabricated with a spin-coated flexible Ag nanowire (NW) bottom electrode, an electrodeposited conformal WO 3- x coating as the functional layer, and an evaporation-defined Au top electrode. With a stacked Ag NWs/WO 3- x /Au architecture and strong interfacial bonding from the conformal coating, the device exhibits robust mechanical flexibility and cycling stability. Notably, the device achieves an ultra-low average energy consumption of merely 3.89 fJ per spike, attributed to the electrodeposition process that generates abundant short-range continuous oxygen vacancies, which shorten the ion migration path and lower the diffusion barrier, thereby enabling conductive filament formation at low voltages. When applied to electrocardiogram (ECG) signal recognition, the device achieves an accuracy of 94.3%, with negligible performance degradation after 2000 bending cycles, underscoring its robust flexibility. These advantages position this memristor as a promising building block for wearable ECG monitoring systems. Download: Download high-res image (221KB) Download: Download full-size image
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Lihong Su,Xiaolu Yang,Qin Yang,Jiahui Xu,Leina Dou,Lei Zhao,Ibrahim A. Darwish,Daohong Zhang
Conventional immunochromatography is limited by insufficient sensitivity and high consumption of monoclonal antibodies, restricting its practical application for trace analysis. Herein, to overcome these limitations, we design a signal amplification strategy based on a CeO 2 @Ag nanocomposite with enhanced peroxidase-like activity and colorimetric properties. The hollow CeO 2 nanospheres offer a high surface area for loading AgNPs, which serve as both electron transfer mediators and peroxidase-like activity to enhance catalytic capacity. By leveraging the multivalent interactions between the primary and secondary antibodies, this approach minimizes carbofuran antibody (mAb 1 ) consumption while maximizing the exposure of its active binding sites. This rational design thereby refines the competitive immunoassay and enables a significant sensitivity boost via signal amplification. The developed CeO 2 @Ag-based immunochromatography achieved a detection limit of 0.087 ng/mL for carbofuran. Moreover, Tetramethylbenzidine (TMB)-mediated catalytic mode significantly extended the linear detection range to 0.08–3.0 ng/mL. Validation in cowpea and lettuce matrices gave average recoveries of 80.35%–108.92% with relative standard deviations below 12.89%, demonstrating excellent practical applicability for sensitive and cost-effective carbofuran monitoring.
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高影响因子
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
·
2026
·Vol. 263
·期 4
·e70212
·
IF 1.7
Huili Yin,Yanping Pan,Wenhao Fan,Qiang Zhang,Shaoping Chen,Jianfeng Fan
Owing to the unique crystal structure and eco-friendliness of the Zintl-phase Mg 3 Sb 2 compound, it has become a research hotspot in the field of thermoelectric materials. Particularly, the key lies in the optimization of its p-type thermoelectric properties. In this work, Ag doping was implemented in the ternary Mg 3 Sb 1.4 Bi 0.6 matrix, which realized the simultaneous improvement of both the electrical and thermal properties in such materials. At 723 K, the maximum power factor of the Mg 2.99 Ag 0.01 Sb 1.4 Bi 0.6 sample reached 6.8 µW cm −1 K −2 , which was approximately three times that of the undoped sample (~2.3 µW cm −1 K −2 at 723 K). In addition, Ag doping introduced extra lattice disorders and point defects, which enhanced the phonon scattering effect and thus led to a significant suppression of lattice thermal conductivity. Specifically, the Mg 2.96 Ag 0.04 Sb 1.4 Bi 0.6 sample achieved a low lattice thermal conductivity of ~0.47 W m −1 K −1 at 723 K. Ultimately, the peak zT value of the Mg 2.99 Ag 0.01 Sb 1.4 Bi 0.6 sample goes up to 0.68 at 723 K, which was three times higher than that of the undoped sample. This study provides an important reference for subsequent research on optimizing the thermoelectric performance of p-type Mg 3 Sb 2 -based materials.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yan Chen,Qingsong Luo,Shuang Gao,Runduo Teng,Qiyuan Fu,Yanting Wang,Changhao Feng
The highly sensitive and rapid detection of n-butanol holds great significance for environmental protection and human health. In this study, Ag-decorated ZnO/SnO 2 (AZSO) nanofibers were fabricated via electrospinning followed by an Ag decoration process. Compared with the undecorated ZnO/SnO 2 nanofibers (ZSO), the as-prepared AZSO sensor exhibited enhanced gas-sensing performance, as its response to 30 ppm n-butanol increased from 29.68 to 37.15. Meanwhile, at the optimal operating temperature of 150 °C, it demonstrates an ultra-fast response time of only 1 s, and its recovery time is drastically shortened from 1776 s to 227 s. In addition, AZSO exhibited stronger selectivity towards n-butanol, accompanied by excellent repeatability and long-term stability. The enhanced gas-sensing performance of AZSO was attributed to the synergistic effect of the Ag spillover effect, the ZnO/SnO 2 n-n heterojunction, and the interfacial electron transfer.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Zhenwu Liu,Ri Zou,Yiheng Zhou,Lei Wang,Chengfa Mu,Shuyan Yang,Tao Shen,Qianhong Shen,Zhong-kang Han,Hui Yang
Arc-induced erosion in electrical contacts poses a significant challenge to the reliability of power systems. Traditional particulate reinforcements in silver-based contact materials suffer from hydrodynamic instability and segregation within the molten pool, compromising their performance. In this study, we introduce a novel “skeleton effect” approach by engineering the reinforcement morphology of La 0.5 Sr 0.5 Co 0.84 Cu 0.16 O 3- δ (LSCCu 0.16 ) within a silver matrix. We synthesized LSCCu 0.16 in three distinct morphologies: fibers, sheets, and particles, and systematically investigated their effects on arc erosion resistance through electrical life testing and Finite Element Method (FEM) simulations. Our results show that while particles segregate due to buoyancy-driven flotation and fibers are susceptible to stress-induced failure, the sheet morphology forms a rigid skeletal network that effectively constrains the molten pool. This network suppresses liquid splashing, resulting in a 111% increase in electrical service life (15,893 ± 215 cycles) and significantly improved contact resistance stability compared to particulate-based composites. The study demonstrates that transforming reinforcement architecture from simple particle dispersion to interlocking skeletal structures can be a transformative strategy for designing next-generation erosion-resistant electrical contacts.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2026
·
IF 17.2
Jiaxiang Qin,Songpei Zhang,Xingju Li,Xintai Chen,Jia Zhao,Xiaoling Mou,Xiangen Song,Li Yan,Ronghe Lin,Yunjie Ding
Precise control over product selectivity in heterogeneous catalysis remains a key challenge due to the complex interplay of structural and electronic factors. Here, we demonstrate delicate tuning of product distribution in 1,3-butadiene semi-hydrogenation by engineering the size and composition of Pd-Ag nanostructures. By systematically decoupling size and electronic effects, we identify critical selectivity descriptors and establish structure-selectivity correlations across both monometallic and bimetallic series. The thresholds of ensemble size and Pd valence state for the formation of distinct products are experimentally determined. Integrating kinetic analysis, chemisorption studies, and density functional theory calculations, we show that increased ensemble size and Ag incorporation weaken 1-butene binding and elevate hydrogenation barriers, enabling selective formation of 1-butene (up to 66%) over thermodynamically favored 2-butenes. These insights reveal the fundamental roles of geometric and electronic modulation in governing selectivity and offer a generalizable framework for the rational design of multifunctional bimetallic catalysts.
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高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Sheng Li,Na Gao,Mingxuan Wang,Xifeng Li,Mingli Wang
GO/Ag SERS substrate was fabricated via self-assembly of Ag NPs and graphene oxide. • GO/Ag SERS composite fiber substrate achieves 10 −11 M visual detection limit for 4-ATP and MG. • GO/Ag SERS substrate shows high uniformity, stability and 10.2% attenuation in 15 days. Surface-enhanced Raman scattering (SERS) has emerged as a powerful technique for ultrasensitive molecular detection. This study develops a SERS substrate based on graphene oxide‑silver (Ag/GO) composite optical fibers, enabling highly sensitive molecular detection. The graphene oxide layer promotes target molecule adsorption through π-π stacking interactions and surface oxygen functional groups, while providing antioxidant protection for silver nanoparticles. Performance characterization using 4-mercaptobenzoic acid (4-MBA) demonstrated excellent repeatability, uniformity, and temporal stability. In addition, the visual detection limit of 4-aminothiophenol (4-ATP) and malachite green (MG) on the fiber optic substrate reaches 10 −11 mol/L. Based on the criterion of signal-to-noise ratio S/N ≥ 3, the quantitative detection limits of the two are 1.93 × 10 −12 mol/L (4-ATP) and 3.8 × 10 −12 mol/L (MG), respectively. These results indicate the application potential of the Ag/GO-functionalized optical fiber SERS substrate in trace analysis. Environmental implication This study employs an Ag/GO composite fiber SERS substrate for the in-situ and rapid detection of malachite green (MG) and 4-ATP in water, without requiring large amounts of organic reagents or causing secondary pollution. MG and 4-ATP have high toxic, resistant to degradation, and prone to bioaccumulation, posing risks to aquatic organisms and accumulating along the food chain. This SERS substrate provides a green approach for early warning of trace pollutants in water environments, contributing to the safeguarding of water ecological security and pollution control. Download: Download high-res image (83KB) Download: Download full-size image
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NANO
·
2026
·
IF 1.3
Zhida Yang,Wenkai Wang,Binbin Gao,Tianzi Xu,Dongxue Zhou,Rongjie Li,Wei Liu,Honglu Liang,Guangsheng Dong,Hongzhi Yuan,Wenjun Dong,Honglin Chen
The Cu@Ag core-shell particles can be employed as conductive phase in conductor paste. Ag shell is designed to protect Cu core from oxidation. To obtain thin, dense and uniform Ag shell on Cu core, a novel electroless Ag plating process for Ag coating is developed. In the process, acacia gum (AG) acts as surfactant and dispersant, manipulating Ag deposition on Cu slowly and accurately. Benefit from the reduction potential difference between Ag and Cu, a thin reduced Ag shell is plated on Cu core with layer growth mode firstly. Then, inhomogeneous surface energy of Ag shell commands its following growth with an island mode. Finally, these Ag islands grow to contact and bond together, resulting in an uniform and dense Ag shell for Cu@Ag. After optimization, the Cu@Ag particle shows excellent oxidation resistant. A mass increase of only 0.5% is observed in it at 300°C. Meanwhile, the Cu@Ag with regular structure also presents remarkable volume conductivity. Over all, the spectacular performance of prepared Cu@Ag powder indicates its promising application in conductive paste.
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PubMed
高影响因子
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