Catalysts
·
2019
·Vol. 9
·期 7
·568
·
IF 3.444
Juan Du,Xinyu Liu,Jiaxin Zhang,Yucun Liu,Enwei Zhu,Guangbo Che,Mingjun Jia
A simple and efficient approach was developed for synthesizing a metal-organic polycatenated compound composed of Ag-triazole complexes and phosphomolybdic acid (PMA) clusters. The hybrid compound, namely {[Ag2(trz)2] [Ag24(trz)18]}[PMo12O40]2(1) (trz = 1,2,4-triazole), showed high catalytic activity, selectivity and recyclability for the epoxidation of olefins with molecular oxygen as the oxidant and isobutyraldehyde as the co-reagent, and could even work well under ambient conditions. The special polycatenane framework, formed by interlocking [Ag24(trz)18]6+nanocages, provides suitable space for filling the PMA clusters. The existence of multi-interactions, including π-π stacking, Ag-Ag interactions, and electrostatic interactions, should play a determinative role in fabricating the catalytically active and stable PMA-based polycatenane catalyst for aerobic epoxidation of olefins.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 2
·81
·
IF 5.3
Zhang Haili,Peng Man,Lu Anjiang,Peng Xishun,Wang Cunwei,Zu Caizhen,Bai Zhongchen
A surface-enhanced Raman scattering (SERS) sensor of Au/Ag nanoparticles (NPs) grown on ZnO/polypyrrole@Poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PPy@PEDOT:PSS) film for detecting norfloxacin (NFX) residues in milk is presented. The ZnO/PPy@PEDOT:PSS film was prepared by the electrochemical deposition method. Subsequently, Ag NPs and Au NPs were deposited on the surface of ZnO/PPy@PEDOT:PSS film to form a Au/Ag/ZnO/PPy@PEDOT:PSS film by an electrochemical deposition process and the magnetron sputtering process, respectively. Owing to the charge transfer between the SERS substrate and the NFX molecules, this SERS sensor could effectively identify low-concentration NFX molecules with a limit of detection (LOD) of 0.84 nM. Moreover, it could also recognize NFX residues in milk with recoveries of 91.2% to 108.4%. The SERS sensor of Au/Ag/ZnO/PPy@PEDOT:PSS film had a high sensitivity, excellent long-term stability, and significant potential in food safety monitoring applications. Graphical abstract
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Haiqiang Liu,Shuying Xu,Yunhan Yue,Yinsha Wei,Ri Qiu,Yibo Ouyang,Peng Wang
Titanium metal and alloys, despite their intrinsic corrosion resistance, are prone to localized corrosion and severe biofouling when deployed in harsh marine environments, which severely compromises their long‑term reliability. To address these issues, we report a multi‑step interfacial engineering strategy for the construction of a slippery liquid‑infused porous surface (SLIPS) on TA2 titanium metal, wherein an electrodeposited dendritic Ag architecture serves as the pivotal multifunctional component. This dendritic Ag skeleton plays a triple role. It provides a rough hierarchical scaffold that, after thiol‑induced superhydrophobicity, firmly locks the infused dimethylsilicone oil to form a stable SLIPS. It acts as a reservoir for sustained Ag + release, conferring long‑lasting antibacterial activity. Moreover, its high thermal conductivity facilitates rapid heat dissipation, significantly reducing ice adhesion. Benefiting from this synergistic design, the resulting coating exhibits outstanding corrosion resistance, with a charge transfer resistance R ct of 4.61 × 10 7 Ω·cm 2 , which is two orders of magnitude higher than that of bare TA2 (7.52 × 10 5 Ω·cm 2 ). Concurrently, the integrated Ag⁺ release and thermal management functionalities endow the coating with potent anti‑biofouling (with inhibition efficiency larger than 90%) and high anti‑icing performance. This work demonstrates that the dendritic metallic skeleton can simultaneously act as a physical barrier, a chemical active source, and a thermal conductor, offering a novel and versatile approach for protecting Ti in the marine environment. Download: Download high-res image (144KB) Download: Download full-size image
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RSC Advances
·
2025
·Vol. 15
·期 44
·37273-37287
·
IF 4.6
Ya Gao,Haoping Huo,Jianlin Li,Nengqing Wang,Haonan Gao,Yingbo Wang
Eradicating cutaneous infections induced by pathogenic microorganisms, such as bacteria, fungi, and viruses, via conventional topical drug delivery is challenging owing to limited epidermal penetration. To overcome this limitation, we fabricated a poly(ethylene glycol) diacrylate (PEGDA) microneedle array coated with a carboxymethyl chitosan (CMC) film embedded within situ-synthesized polydopamine-modified silver nanoparticles (PDA@Ag NPs) for enhanced antibacterial efficacy. This design utilizes microneedle (MN)-mediated skin perforation to enhance drug permeation, combined with rapid film dissolution for the efficient release of the payload. The experimental findings revealed that the PDA@Ag-CMC/PEGDA MNs possess favorable biocompatibility along with dual photothermal and photodynamic functionalities. Mild photothermal therapy (PTT) triggered by these MNs promotes the production of antibacterial reactive oxygen species (ROS), resulting in a high antibacterial rate of up to 98% against both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) under NIR irradiation at a PDA@Ag concentration of 40 μg mL−1. To assess transdermal delivery performance, lidocaine hydrochloride (LiH) (78 μg per MN array) was incorporated into the CMC film as a model drug. Physiological conditions confirmed accelerated LiH release from the PDA@Ag-LiH-CMC/PEGDA system upon aqueous exposure. This minimally invasive approach demonstrated promising broad-spectrum antibacterial activity, suggesting that the PDA@Ag-LiH-CMC/PEGDA platform could serve as a viable clinical solution for managing polymicrobial skin infections and alleviating wound pain.
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Analytical Methods
·
2023
·Vol. 15
·期 26
·3251-3258
·
IF 3.1
Feifei Li,Congcong Hu,Wenen Su,Hao Liang,Fubing Xiao,Jinquan Liu,Yan Tan,Shengyuan Yang
L-Cysteine, widely used in medicine and the food industry, is of great essentiality to organisms and the food quality. Given that current detection approaches require exacting lab conditions and tedious sample treatment, there is a pressing demand for developing a method that possesses advantages of user friendliness, prominent performance, and cost-effectiveness. Herein, a self-cascade system was developed for the fluorescence detection of L-cysteine based on the ingenious performance of Ag nanoparticle/single-walled carbon nanotube nanocomposites (AgNP/SWCNTs) and DNA-templated Ag nanoclusters (DNA-AgNCs). The fluorescence of DNA-AgNCs could be quenched on account of the adsorption of DNA-AgNCs on AgNP/SWCNTs by π–π stacking. With the cooperation of Fe2+, AgNP/SWCNTs with oxidase and peroxidase-like activities could catalyze the oxidation of L-cysteine to produce cystine and hydrogen peroxide (H2O2) and then break the O–O bond of H2O2 to generate a hydroxyl radical (·OH), which could cleave the DNA strand into different sequence fragments which subsequently peeled off from the AgNP/SWCNTs, resulting in a “turn-on” fluorescence response. In this paper, AgNP/SWCNTs with multi-enzyme activities was synthesized enabling the reaction to proceed in just one step. The successful preliminary applications for the L-cysteine detection in pharmaceutical, juice beverage, and serum samples indicated that the developed method exhibited great potential in medical diagnosis, food monitoring, and the biochemical field, which also broadened the horizon for follow-up research.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 47
·21693-21708
·
IF 4.682
Du Jinyan,Xu Na,Wang Chaofeng,Shu Qin,Xu Qidi,Zhang Ping,Zhuo Shujuan,Zhu Changqing
Novel red-emitting B, N, S-co-doped carbon dots (B,N,S-CDs) were prepared via a one-step hydrothermal carbonization. The obtained B,N,S-CDs are found to be responsive to the pH changes, i.e., the fluorescence intensities obviously change with the watershed of pH 7.4, accompanied by a blue-shift of the fluorescence emission wavelengths with the pH from 1 to 13. The surface state and size of the B, N, S-CDs are responsible for the fantastic responses. Furthermore, introduction of Ag + into the B, N, S-CDs resulted in fluorescence quenching and apparent changes of extinction value, thereby the quantitative assay can be successfully realized where a linear range of 0.1–400 and 0–700 μM with a detection limit of 38 and 107 nM is obtained, respectively. The mechanism might be due to static quenching and induced electron/energy transfer (ET) resulted from the formation of non-fluorescent complex. Strikingly, Ag + can be visualized via evident color changes from red to navy blue under UV light and from maroon to dark brown under sunlight, respectively. These findings indicate that the as-obtained B, N, S-CDs possess a great potential as a dual probe of pH and Ag + ions for biosensing. Graphical Abstract The red-emitting fluorescent B, N, S-CDs with a fantastic pH-sensitive feature, as a dual-mode nanosensor via colorimetric and fluorescence outputs, were applied to detect Ag + ions with the LOD of 107 and 38 nM, respectively.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Yanting Dou,Zhiman Liang,Zhenhe Xu,Yuanjin Wang,Jiqi Zheng,Dongling Ma,Yu Gao
Photocatalysis is considered a promising technology to alleviate the energy crisis and environmental pollution; however, developing photocatalysts with improved light absorption efficiency is still a challenge. In this work, an effective strategy was proposed to synthesize a highly functional ternary nanocomposite (g-C3N4/RGO/AZIS) by coupling broader light-absorbing Ag-doped ZnIn2S4 (AZIS) nanoplates with ultrathin g-C3N4 and reduced graphene oxide (RGO) nanosheets. The 2D-on-2D stacking nanostructure of the composite provides a compact heterojunction, enlarged interfaces, and enriched active sites, resulting in the accelerated separation and relocation kinetics of charge carriers. Benefiting from these advantages, the g-C3N4/RGO/AZIS nanocomposite with systematically optimized contents of RGO and AZIS can serve as an efficient bifunctional photocatalyst for both H2 production from water splitting and methyl orange (MO) photodegradation under the irradiation of visible light. The H2 production rate of the ternary nanocomposite is 658.5 μmol h–1 g–1, which is 38 times higher than that of plain g-C3N4. The operation mechanism is proposed based on the results of scavenger tests and photoelectrochemical analysis. The formation of a type-II heterostructure between AZIS nanoplates and g-C3N4 nanosheets along with RGO with lower potential can maximize the separation efficiency of photogenerated electron–hole pairs and decrease the charge recombination. This work provides a viable strategy to develop bifunctional photocatalysts with enhanced performance for both H2 production and degradation of organic dyes.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ye Yang,Fangbo Zhao,Liu Yang,Jiaming Zhang,Hee-Deung Park,Zhiguo Li,Hongxu Chen,Ximeng Zhang,Mingjin Gao
Most ultrafiltration (UF) membranes can hardly remove organic pollutants with low molecular weight, like Bisphenol A (BPA). This study effectively addressed the issue by immobilizing the GO-Ag nano-sheet catalyst within the finger-like pores of a polymer UF membrane using bottom cross-flow filtration. The catalytic membrane operated under a low pressure of 0.2 MPa and achieved a remarkable water flux of 368 L/(m 2 ·h). By filtering aqueous substrates with BPA and humic acid (HA), the UF membrane could effectively reject most of the high molecular weight HA (>90.8%). The BPA entered the membrane pores could be effectively decomposed (>99.4%) by the free radicals generated by the peroxydisulfate(PDS)/GO-Ag system. Also, the catalytic membrane exhibits significantly enhanced BPA degradation kinetics, up to 19.6 times higher than those of conventional suspension-based methods. Moreover, the GO-Ag catalytic membrane demonstrates excellent reusability, maintaining almost constant flux after multiple cycles with a flux recovery rate (FRR) of 90.1%. This is attributed to the in-situ degradation of pollutants attached to the membrane by the free radicals. In addition, it is proved that the GO-Ag catalytic membranes show significant antibacterial abilities. In summary, the GO-Ag/PES catalytic membrane offered significant advantages, such as a convenient fabrication process and the integration of membrane separation and advanced oxidation processes (AOPs) in a single step, eliminating pollutants quickly, saving catalysts and oxidants, and minimizing membrane fouling.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Qing Huang,Xiaokun Li,Suxiang Feng,Wenfeng Zhuge,Jinyun Peng,Xiaoting Li
Ag nanoparticles functionalized with poly-acid chrome blue K and graphene (Ag-poly-ACBK@Gr) were successfully fabricated on the surface of a glassy carbon electrode using layer-by-layer electropolymerization. The surface structure of the synthesized modified glassy carbon electrode was characterized by scanning electron microscopy. The electrochemical behaviours of diclofenac sodium (DS) at the Ag-poly-ACBK@Gr-modified electrode were investigated by cyclic voltammetry and differential pulse voltammetry. It was found that the prepared sensor exhibited a cathodic peak at 0.78 V with higher peak current response compared to the related modified electrodes. Under optimal conditions, the sensor for the determination of DS exhibits a good linear relationship between the peak current and DS concentration in the range from 0.1 to 40 μM, and the equation is Ip (μA) = 7.23 × 10 3 c (μM) + 3.46 × 10 -2 (R = 0.9955) with the estimated limit of detection of 34.2 nM (S/N = 3). The Ag-poly-ACBK@Gr-modified glassy carbon electrode with high sensitivity and excellent stability and selectivity was successfully applied to detect DS in real drugs and human urine at the recoveries ranging from 99.60 to 101.84%.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Na Zhang,Shuangshuang Peng,Zhiyu Liu,Ye Li,Ju Huang,Jing Li,Hongri Wan,Shuai Zhou,Zhaojian Gao,Teng Chen
In this paper, Ag NPs-decorated magnetic Fe 3 O 4 @PDA nanocomposites have been successfully prepared. The spherical Fe 3 O 4 nanoparticles with an average size approximately 340 nm were modified by dopamine under mild conditions. Dopamine was self-polymerized surrounding Fe 3 O 4 nanoparticles and transformed into poly dopamine (PDA) layers. The PDA-encapsulated magnetic (Fe 3 O 4 @PDA) nanoparticles could in-situ reduce silver ammonium ions by the catechol groups in PDA layers. The Ag NPs with an average size ranging from 20 nm to 36 nm were densely decorated on the thin PDA shell. The resultant Fe 3 O 4 @PDA-Ag nanocomposites were employed as highly efficient catalysts for the reduction of different organic pollutants in the appearance of sodium borohydride. The Fe 3 O 4 @PDA-Ag nanocomposites also demonstrated extraordinary cycling stability when the catalyst was recycled several times for the reduction of MB. The antimicrobial tests indicated Fe 3 O 4 @PDA-Ag nanocomposites could efficiently prohibit the growth of microorganism, including various bacteria and fungi. The minimal inhibitory concentrations (MIC) for Fe 3 O 4 @PDA-Ag nanocomposites against different bacteria and fungi were also determined. The excellent catalytic activity, magnetic recyclability, and antimicrobial performance make Fe 3 O 4 @PDA-Ag a feasible candidate for the remediation of wastewater which contains multiple water soluble organic pollutants and pathogenic microorganism.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 3
·2210551
·
IF 19.924
Hang Geng,Mengyang Wang,Songfan Wang,Dongxing Kou,Zhengji Zhou,Wenhui Zhou,Yafang Qi,Shengjie Yuan,Litao Han,Yuena Meng,Sixin Wu
Abundant intrinsic defects and defect clusters in Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells lead to severe nonradiative recombination and limited photoelectric performance. Therefore, developing effective method to suppress the detrimental defects is the key to achieve high-efficiency solar cell. Herein, a convenient two-step cooling strategy in selenization process is reported to suppress the Cu Zn and Sn Zn defects and defect clusters synergistically. The results show that rapid cooling during section from selenization temperature to turning temperature can inhibit the volatilization of Sn and restrain the corresponding Sn-related defects, while slow cooling during the subsequent temperature section can reduce the degree of Cu-Zn disorder. Benefitting from the synergistic effect of two-step cooling, a significantly lowered concentration of Sn Zn and Cu Zn defect and their defect clusters [2Cu Zn +Sn Zn ] in absorber is observed, meanwhile, a reduced band tailing effect and promoted carrier collection efficiency of the photovoltaic device is obtained. Finally, a device with improved open-circuit voltage ( V oc ) of 505.5 mV and efficiency of 12.87% is achieved. This study demonstrates the impact of cooling process on defects controlling for the first time and provides a simple and effective new strategy for intrinsic defect control, which may be universal in other inorganic thin film solar cells.
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MATERIALS & DESIGN
·
2022
·
IF 9.417
Yanqing Xue,Qitang Hao,Xinlei Li,Han Zhang,Peiqing Wang,Chengze Yin,Bo Li,Xinliang Wang
The strength-ductility trade-off severely limits the extensive application of particle-reinforced aluminum matrix composites mainly owing to the critical issues of local particle agglomeration and poor interfacial characteristics. The present work concentrates on these intractable puzzles and proposes Mg-Ag microalloying TiB 2 /Al-4.5Cu composites fabricated by an optimized salt-metal reaction method and multistage heat treatment. The resulting microstructure evidence that this new tactic synergistically ameliorates the detrimental agglomeration of TiB 2 particles by Mg and Ag doped at the TiB 2 /α-Al interface， meanwhile promoting the formation of nanosized Ω-Al 2 Cu and σ-Al 5 Cu 6 Mg 2 phases. The mechanical property experimental results indicate that the Mg-Ag microalloyed TiB 2 /Al-4.5Cu composites exhibit an accredited combination of the tensile strength (ultimate tensile strength is 496.3 ± 15.0 MPa) and ductility (uniform elongation is 12.8 ± 1.4 %). We emphasize the reciprocal effect between TiB 2 particles and the precipitated phase associated with unrelaxed misfit strains. Close attention is also paid to the interface binding characteristics and semi-coherent interphase boundary to evaluate their contribution to the ductility. The microalloying strategy can potentially be applied to many other metal matrix composites and boost analogous approaches for designing ultrahigh yet ductile materials for technological applications.
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