RARE METALS
·
2021
·Vol. 41
·期 1
·86-95
·
IF 4.003
Tian Bang-Zhou,Jiang Xu-Ping,Chen Jie,Gao Han,Wang Ze-Gao,Tang Jun,Zhou Da-Li,Yang Lei,Chen Zhi-Gang
Abstract Interface engineering has been regarded as an effective strategy to manipulate the thermoelectric performance of materials. Here, we use a facile chemical electroless plating and a spark plasma sintering process to fabricate Ag-plated SnTe bulk. After sintering, a small amount of plated Ag can be doped into SnTe to suppress the Sn vacancies and the others form Ag precipitates with a size distribution from nanoscale to microscale, which introduces Ag/SnTe interfaces to enhance the Seebeck coefficient via energy filtering effect. Simultaneously, these structures result in strong scattering to reach a low lattice thermal conductivity of ~ 0.62 W·m –1 ·K –1 . Consequently, a maximum figure of merit ( zT ) of ~ 0.67 at 823 K is achieved in 2 wt% Ag-plated SnTe, which is ~ 60% higher than that of pristine SnTe. Moreover, the microhardness indentation test results show that the mean microhardness of 2 wt% Ag-plated SnTe is HV 64.26, which is much higher than that of pristine SnTe, indicating that Ag electroless plating can improve the mechanical properties of SnTe. This work has provided a facile and eco-friendly method to realize the interface engineering for manipulating the thermoelectric and mechanical properties of SnTe. Graphical abstract
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高影响因子
POLYMER
·
2022
·
IF 4.432
Ruizhe Lin,Zhengqiao Yin,Yuanyuan Sun,Shengmiao Zhang
This work demonstrates an ex-situ swelling strategy for fabrication of the robust hierarchically porous polyHIPE. Specially, a cationic polyHIPE was prepared by copolymerization of 2-(methacryloyloxy) ethyltrimethylammonium chloride, styrene and divinylbenzene within a water-in-oil (w/o) high internal phase emulsion (HIPE). The hierarchically porous polyHIPE was achieved via simply swelling the polyHIPE in decane at 70 °C, and subsequent removal of the solvent at room temperature . There were large amounts of small pores found on the void wall surface. Compared with the hierarchically porous polyHIPE fabricated with decane as porogen (in-situ swelling, conventional route), the ex-situ swelling strategy endowed the materials semblable complex pore morphology but much less damage to its compression performance. The young's modulus of the hierarchically porous polyHIPE herein was 37% higher than that obtained by a conventional way. Afterwards, the hierarchically porous polyHIPE was utilized as a carrier for AgNPs (AgNPs@polyHIPE). The AgNPs@polyHIPEs exhibited eminent catalytic activity and recyclability for the reduction of the rhodamine B. Thereby, a facile approach for preparation of high strength and hierarchically porous polyHIPE was presented, and the resulted polyHIPE can be an ideal support for noble metal nanoparticle catalysts.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Dexin Chen,Yaoxin Li,Xueyang Zhao,Hongyuan He,Guodong Sun,Wei Li,Xiaojian Wang
In this study, different surface textures (Diamond, Cylinder, and Sin) have been designed and produced on Ti6Al4V alloys by selective laser melting technology. TiO 2 /Ag composite coatings were prepared on these textures by merging anodic oxidation and spray deposition methods. Tightly arranged TiO 2 nanotubes (TNTs) with tube diameters of about 100 nm are found on the top and lateral sides of the textures. On the bottom of the textures, dense nanopores were found with a pore diameter of about 50 nm. Compared with the untreated titanium alloy surface, both texture and TNTs structures would endow the titanium alloy surfaces with higher in vitro bioactivity. All three textures have an enhanced antibacterial property and a complete bactericidal effect was achieved by spray deposition of Ag nanoparticles (AgNPs) on all the surfaces. The MC3T3-E1 cells can adhere to the surfaces and proliferate normally, indicating good cytocompatibility of TiO 2 /Ag surfaces. Besides, the deposited AgNPs have been found to promote cell proliferation .
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Xiaojie Song,Xiufang Wang,Weiwei Dong,Qishu Qu,Haichen Wang,Fan Yang
Solar-to-chemical energy conversion via heterogeneous photocatalysis is one of the effective approaches to tackle the growing environmental and energy challenges. Homogeneously dispersed silver nanoparticles (Ag NPs) and cadmium sulfide nanoparticles (CdS NPs) with average particle size not>20 nm were fabricated on the surface of titanium dioxide nanotubes (TNTs) (Ag/CdS/TNTs) with the help of sodium dodecyl benzene sulfonate (SDBS). Herein, more surface active sites are created on the surface of nanocomposites. The experimental results demonstrate that the photocurrent intensity of the nanocomposites obviously increased, which effectively improves the photocatalytic activity. The results of photocatalytic experiments indicated that using triethanolamine (TEOA) and acetonitrile (MeCN) as sacrificial agents, the nanocomposites afford the CO yield from CO 2 (1455.6 μmol‧g −1 ‧h −1 ). Besides, Ag/CdS/TNTs nanocomposites displayed the H 2 evolution rate of 3700.57 μmol‧g −1 ‧h −1 , which was twice as much as pure TiO 2 NPs. The increase in the photocatalytic ability of the nanocomposites is basically attributed to the three materials formation S-scheme heterojunction which reduce the recombination probability of the photo-induced electrons and holes and thus enhances the photocatalytic activitys. Ultimately, a photocatalytic reaction mechanism is proposed for Ag/CdS/TNTs nanocomposites in the reduction of CO 2 .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yishu Qiu,Zheng Hu,Hui Li,Qianqian Ren,Yanan Chen,Shi Hu
The commercial catalysts for oxygen reduction reaction (ORR) are highly dependent on the scarce and expensive Pt to achieve high activity and reasonable durability, especially for the fuel cells used in automobiles. Ag alloys have been proposed as promising candidates for non-Pt ORR catalysts in alkaline media, with reasonably high activity at significantly lower cost. Herein we demonstrate the synthesis of Ag/Co/C hybrid electrocatalyst for ORR via radiative flash Joule heating. Unlike the previously reported solid-solution structure of the quenched immiscible alloys by flash Joule heating, the large immiscibility gap in the liquid state of the Ag-Co alloy prevents the formation of solid solution. The hybrid catalyst exhibits a specific activity 40 times and a mass activity 52 times higher than that of the pristine Ag/C at 0.8 V vs. RHE in alkaline media, and its tolerance to methanol and ethanol is superior to that of commercial Pt/C. The enhanced activity and good stability are attributed to the enhanced oxygen adsorption energy on silver due to the strong interaction between silver and cobalt.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Mingqian Wang,Ying Liang,Zhicheng Zhang,Guohong Ren,Yajun Liu,Shishan Wu,Jian Shen
Novel multifunctional core-shell nanoparticles (NPs) have attracted widespread attention due to their easy-to-modify surface properties and abundant functional groups. This study introduces a facile approach to synthesize Ag@ iron oxide (Fe 3 O 4 ) @C NPs, and modify with amino-poly (ethylene glycol) (PEG)-carboxyl and folate (FA) on the exposed carbon surface to produce high contrast for excellent stability, good biocompatibility, cancer cell targeting, and synergistic treatment. The multi-armed PEG at the edge of Ag@Fe 3 O 4 @C NPs provides the materials an excellent capacity for doxorubicin (DOX) loading. The carbon layer could be used as a photothermal reagent due to its excellent near-infrared (NIR) absorbance capacity, and Fe 3 O 4 was used as a reagent for magnetic resonance (MR) imaging. In vivo combination therapy with this agent was administered in a mouse tumor model, and a remarkable synergistic antitumor effect that is superior to that obtained by monotherapy was achieved. Concerning these features together, these unique multifunctional Ag@Fe 3 O 4 @C-PEG-FA/DOX NPs could be regarded as an attractive nanoplatforms for chemo-photothermal synergistic tumor therapy with dual-modal fluorescence and MR imaging-guided targeting.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yiyan Jiang,Hongkuo Si,Maolin Chen,Miao Su,Gangqiang Wang,Caiqin Gu,Shujun Zhao,Shuangfei Xiang,Xiangdong Liu,Feiya Fu
Direct fabrication of antimicrobial cellulose filaments by wet spinning remains challenging due to complex nanoparticle synthesis and dispersion issues. To address this, we developed a one-pot in situ synthesis strategy within a cellulose-dissolving alkaline system. In this approach, the hydroxyl and terminal aldehyde groups of cellulose chains facilitate the in-situ formation of antibacterial particles (Ag NPs, ZnO). By modulating the particles composition and coagulation bath, we have produced three structurally distinct antibacterial regenerated cellulose filaments. These are designated as regenerated cellulose filaments contain Ag NPs (ACF), regenerated cellulose filaments contain ZnO particle (ZCF) and regenerated cellulose filaments contain ZnO particle and Ag NPs (AZCF). ACF exhibited a smooth surface with limited silver nanoparticle visibility, ZCF displayed surface roughness due to ZnO particle aggregation, and AZCF maintained surface smoothness with dense, uniform nanoparticle distribution. This phenomenon is attributed to the interactions of Ag NPs and ZnO particles. Based on this interaction, the regenerated cellulose developed in this study exhibit both antimicrobial activity (> 95 % bactericidal rates against both E. coli and S. aureus ) and low cytotoxicity. Mechanistic investigations indicate that its antibacterial effects originated from the synergistic action of reactive oxygen species (ROS) production and regulated metal ion release.
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产品关联
DOI
PubMed
高影响因子
CORROSION
·
2023
·Vol. 80
·期 2
·187-196
·
IF 1.6
Li Bowen,Pan Fengze,Pan Chengyu,Lv Tianyi,Wang Xiaotian,Ju Xiang,Gong Kaifei,Zou Wenkai,Zheng Chuanbo
The Ag-Ni-Co alloy coating is prepared in the low eutectic solvent system by pulsed power supply technology. Infrared spectroscopy and cyclic voltammetry are used to confirm that the addition of metal salts does not change the low eutectic solvent system. When the current density is 1 A/dm 2 and the plating time is 40 min, the plating grain is mainly spherical; the coating is uniform and dense. After testing, the surface-specific resistance of the plating is only 1.295 mΩ·cm 2 , the microhardness reaches 214.8 HV, and the wear rate reaches 3.1. The corrosion resistance of the plating and the substrate is analyzed by a combination of macroscopic electrochemistry and microarea electrochemistry, and the results show that the corrosion potential of the plating reaches −0.141 V, and the corrosion current density reaches 1.299 × 10 −7 A/cm 2 . The corrosion resistance of the plating is much greater than that of the substrate.
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高影响因子
NANO
·
2018
·
IF 1.1
Xu Yan,Ziyang Wu,Yong Zhao,Biao Liu,Yubin Tang
Silver nanoparticles (NPs) and related semiconductors are a family of very important and widely applied photocatalysts. However, the preparation of high stability and activity of this photocatalyst is still a challenge. In this work, we report a stable Ag/AgCl/AgBi(MoO 4 ) 2 heterojunction photocatalyst fabricated via a simple in situ anion-exchange reaction followed by the photoreduction treatment. In the treatment of tetracycline (TC) wastewater under visible light, the AC-0.4 sample (prepared with 0.4 mmol KCl) exhibits the significantly improved activity (degradation ratio, DR of 71.3%) compared with the pristine AgBi(MoO 4 ) 2 (30% DR) and Ag/AgCl sample (synthesized by the photoreduction of AgCl) (37% DR) under identical experimental conditions. This activity promotion is from the fast interfacial electron transfer between the heterojunction phases of AgCl/AgBi(MoO 4 ) 2 and the SPR effect of Ag NPs. After five successive recycles, the AC-0.4 sample still maintains good stability and activity for TC degradation, which shows a great potential to be used in practical application. Through the ESR and controlled scavenged experiments, we found the • OH and • O 2 − are the major reactive intermediate species in the TC photodegradation reaction. Our work provides a new insight into the synthesis of stable and high efficient Ag-based heterojunction photocatalysts for the application of wastewater treatment.
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高影响因子
ACS SYMPOSIUM SERIES
·
2014
·
IF 0
Chun He,Yibing Gong,Shuzhen Li,Lingling Hu,Yichang Yang,Lianpeng Sun,Dong Shu
A visible-light-driven photo fuel cell (PFC) system, consisting of a Ag-BiOI/ITO photoanode and a Pt photocathode, was used to generate electricity by using wastewater organic compounds as electrolyte and fuel. The prepared BiOI and Ag-BiOI/ITO photoanodes were characterized by X-ray diffraction (XRD), scanning electronic microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectroscopy (DRS) to examine the surface structure, chemical composition, and the properties of light absorption. The photoactivity of Ag-BiOI/ITO photoanodes was evaluated in the term of the electricity generation efficiency and degradation efficiency for recalcitrant organic pollutants. Compared with a BiOI/ITO photoanode, it was found that the efficiency of electricity generation using the Ag-BiOI/ITO photoanode was significantly higher in PFC system under visible light. Similarly, the photocatalytic degradation efficiency of wastewater organic pollutants using Ag-BiOI/ITO photoanode was significantly higher than that of BiOI/ITO. The enhancement in the electricity generation efficiency and degradation efficiency for wastewater organic pollutants is attributed to the action of these dopants Ag on BiOI surface, which play a key role by driving the electrons to the cathode via an external circuit.
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RSC Advances
·
2021
·Vol. 11
·期 26
·15959-15968
·
IF 3.361
Guozheng Zhao,Hui Liang,Hongzhu Xu,Changbo Li,Qingwei Tan,Daihang Zhang
Ordered mesoporous Ag/CeO2 catalysts have been successfully synthesized by a microwave assisted soft template method. The morphology, structure and chemical composition of the catalyst were characterized by XRD, N2 adsorption–desorption, SEM, EDS, TEM and XPS. The study of catalytic performance and reaction kinetics of organic matter degradation in acrylonitrile wastewater was performed in a catalytic wet peroxide (CWPO) system. The degradation pathways of organic matter in acrylonitrile wastewater were elucidated by temporal evolution of intermediates and final products detected by GC/MS analysis along with a continuous flow experiment study. The results show that the Ag/CeO2 has an ordered mesoporous structure, the specific surface area is 91.4–118.2 m2 g−1 and the average pore size is 12.63–16.86 nm. 0.4-Ag/CeO2 showed the best catalytic performance, the COD removal rate reached 94.6%, which was 30% higher than that of CeO2. The degradation is in accordance with the second-order reaction kinetics of the Arrhenius empirical model and Langmuir–Hinshelwood kinetic model. However the latter fits better, and the linear correlation coefficient R2 is more than 0.98, which describes the adsorption catalytic mechanism of Ag/CeO2. According to the analysis by GC/MS, the organic compounds in acrylonitrile wastewater oxidized into intermediate compounds and other small compounds, then are further oxidized into carbon dioxide and water. The catalytic activity of Ag/CeO2 was the result of the combination of Lewis acid–base position of CeO2 and redox cycle of Ce3+/Ce4+.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Xiaojin Fu,Sijie Li,Jing Wen,Fuyan Kang,Congying Huang,Xiaogang Zheng
ZnFe 2 O 4 -coated Ag nanowires (Ag@ZnFe 2 O 4 NWs) were prepared for the photo-Fenton induced dehydration of fructose into 5-hydroxymethylfurfural (5-HMF) in visible light region. Effects of ZnFe 2 O 4 content, volume ratio of dimethyl sulfoxide (DMSO) to deionized water, reaction temperature, fructose dosage, H 2 O 2 content, pH values, inorganic ions, and quenchers on the fructose conversion, 5-HMF yield, and 5-HMF selectivity were performed in detail. Among these obtained composites, Brønsted acidic Ag@ZnFe 2 O 4 NWs with Ag NWs diameter of around 20 nm and ZnFe 2 O 4 coating of 6.13 wt% exhibit the best photo-Fenton catalytic activity for the conversion of fructose into 5-HMF, and slightly deactivate after five cycle times. The surface plasmon resonance effect of Ag NWs and the synergistic effect between ZnFe 2 O 4 and Ag NWs are favorable for the visible light absorption and the efficient transfer and separation of charge carriers. DMSO as well as OH radical plays the vital role in the photo-Fenton induced dehydration of fructose into 5-HMF.
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高影响因子
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