WEAR
·
2024
·
IF 5.3
Jiebin Du,Mingchong Lu,Jiamin Fang,Wei Li,Dexin Chen
In this work, an innovative approach termed rotary spray deposition has been developed for the synthesis of conductive and wear-resistant silver (Ag) coatings on copper (Cu) substrates, aimed at applications in electrical contact materials. The fabricated coatings exhibited superior properties, demonstrating significantly higher hardness (140 HV) and markedly lower resistivity (1.711 × 10 -8 Ω m) compared to conventional silver contacts. The tribological behavior and wear mechanisms of the Ag coatings were rigorously evaluated using reciprocating friction testing under conditions of minimal load and current. Findings revealed that wear predominantly occurs through mechanisms of fatigue, abrasive, and adhesive wear. Notably, the introduction of a 2A current in conjunction with a 3 N force during friction testing resulted in a stable and reduced coefficient of friction, a smoother wear track surface, and the lowest contact resistance observed, indicative of enhanced antiwear properties. This improvement is attributed to the synergistic effects of electric current and friction, leading to the formation of a nanocrystalline structural layer at the wear track. Such a layer facilitates a stable frictional contact state and enlarges the contact area, thereby achieving a stable conductive state with reduced contact resistance and, consequently, superior tribological properties.
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ChemistrySelect
·
2024
·Vol. 9
·期 31
·e202401727
·
IF 1.9
Dan Liu,Ying Qiu,Fengrui Yu,Guohua Zhang,Wenjuan Zhou,Qingting Ni
Graphical In the present study, the blue fluorescent L-Cys@Ti 3 C 2 MQDs are synthesized using hydrothermal methods, and the preparation process is simple, rapid, and mild. The fluorescence of L-Cys@Ti 3 C 2 MQDs can be effectively quenched by Ag + through a static quenching mechanism, demonstrating high sensitivity and excellent selectivity for Ag + detection. MXene quantum dots (MQDs), an emerging zero-dimensional nanomaterial, have garnered significant attention from researchers due to their distinctive physical and chemical properties. In this study, cysteine-functionalized Ti 3 C 2 MQDs were synthesized using a facile hydrothermal methods, resulting in the functionalized Ti 3 C 2 MQDs exhibiting intense blue fluorescence attributed to size-dependent effects and surface defects. Furthermore, the cysteine-functionalized Ti 3 C 2 MQDs exhibit excitation wavelength-dependent emission behavior and serve as a highly sensitive fluorescent probe for Ag + detection with an impressive low limit of detection (LOD) of 0.015 μM. Moreover, they demonstrate exceptional sensitivity and selectivity in determining Ag + . This study presents a novel approach for the detection of Ag + and highlights the immense potential of cysteine-functionalized Ti 3 C 2 MQDs in environmental applications.
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ChemNanoMat
·
2024
·
IF 2.6
Haibo Zeng,Shuai Yang,Danni Yan,Hong Zhu,Naiwei Wei,Yuhui Dong,Yousheng Zou
In recent years, Ag-In-Ga-S (AIGS) quaternary quantum dots (QDs) have garnered significant attention as a novel class of environmentally friendly and non-toxic QDs. However, the hydrothermal synthesis method for aqueous QDs has been plagued by issues such as inconsistent size, subpar crystallinity, and low photoluminescence quantum yield (PLQY). Herein, we developed a dual ligand strategy based on the hard and soft acids and bases (HSAB) theory to synthesize aqueous AIGS QDs with an impressive PLQY of up to 64.3%, currently the highest value among hydrothermal-synthesized uncoated I-III-VI QDs. The QDs exhibit better crystallinity, narrow size distribution (3.07 ± 0.31 nm), and remarkable stability. The mechanism underlying this dual ligand strategy was further elucidated, shedding light on the distinct influences of different ligands on the growth of QDs. The high PLQY contributes to the further application of aqueous AIGS QDs in luminescent displays and the field of biology. Meanwhile, this ligand strategy has broad reference significance for efficient preparation of other water-soluble QDs.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yidan Zhang,Zhiguang Guo
Multifunctional wearable textiles can simulate human perception and convert it into visual data, which has advanced application prospects. As an important branch, thermal management wearable textiles have been widely concerned in the aspects of thermal insulation, flame retardant, photothermal anti-icing, electrothermal deicing and even water evaporation. Here, inspired by the bearing structure, we simply soaked the PET textile in Ag@MXene hybrid solution several times to form a Ag@MXene conductive network with Ag NPs as the connection point on the textile fiber, and finally carry out hydrophobic modification. Based on plasma effect, the synergistic action of Ag NPs and MXene enhances the photothermal response of the material. In addition, the addition of Ag NPs effectively reduces the stacking between MXene layers and forms a Ag@MXene conductive network with Ag NPs as the connection point on the textile fibers. The stable temperature range of PDMS/Ag@MXene PET textile is 70–80 °C under one solar illumination intensity, and the stable temperature of PDMS/Ag@MXene PET textile can reach 117 °C at a constant voltage of 3 V. Based on the excellent thermal effect, this textile achieves photothermal anti-icing, electric thermal de-icing, keeping warm and removing sweat. The textile has a water evaporation efficiency of about 0.58 g h −1 , which can achieve excellent anti-sweat function. Finally, the textile also achieved rapid flame retardant within 7 s. PDMS/Ag@MXene PET textile processes excellent photothermal and electrothermal conversion ability, acid/water stability and flame retardant ability, and has promising application prospects in thermal management textiles such as deicing and anti-icing, fire prevention, warmth and water evaporation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Kai Jin,Xiaoping Huang,Huifang Yang,Yahong Li,Jianxian Zeng,Hu Zhou,Yuan Liu,Rui Zhang
The efficient removal of Ag + ions from wastewater not only preserves the environment but also promotes the reutilization of silver metal. Therefore, in this study, we have developed an advanced ion imprinted membrane (IIM) and employed it as an adsorbent for the efficient removal of Ag + ions from aqueous solution. The dynamic adsorption results demonstrated that the prepared IIM exhibited superior filtration and separation performance when applied to feed solutions with lower concentrations (12 mg/L) and higher pH levels (pH=6). The presence of co-existing metal ions in the feed solution had negligible impact on the separation efficiency of IIM towards Ag + ions, highlighting its exceptional recognition ability and selective separation capability. The results from static adsorption experiments indicated that the adsorption of Ag + ions onto the membrane surface conformed to both Langmuir model and the pseudo-second-order model, indicating that the adsorption process was a monolayer chemisorption . Reusability findings revealed a slight decline in uptake capacity and water flux of IIM after five desorption-adsorption cycles, showcasing its potential application value in Ag + ions removal. The EDS , FTIR and XPS results substantiated that Ag + ions were adsorbed onto the IIM surface through the chemical reactions between Ag + ions and C S and C O groups.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhongzheng Zhu,Siyu Liu,Junyi Yao,Qitan Zheng,Yutong Guo,Yujie Chen,Hezhou Liu,Hua Li
To address the issue of low strength and recovery stress in recyclable shape memory polymer (SMP) materials with dynamic covalent bonds in practical applications, we propose a method based on Ag-S coordination interactions to improve dynamic covalent bonds, thereby preparing recyclable SMP with high recovery stress and large recovery strain. The introduction of in situ reduced silver nanoparticles (AgNPs) in the SMP system play multiple roles, serving as additional physical crosslinking points at the microscale and coordinating with disulfide bonds in the system to construct a multi-level dynamic network structure. This endows the material with exceptional mechanical properties (tensile strength of 25.93 MPa and fracture strain of 1466.83 %) and recovery driving stress (5.59 MPa), while maintaining more than 99 % shape recovery and fixity rate. Furthermore, due to the outstanding photothermal performance of AgNPs, the composite material has acquired remote photothermal driving capabilities. The proposed Ag-S coordination enhancement offers a new approach for SMP materials that achieve both large actuation distance and high recovery stress, holding significant potential for applications in soft robotics and actuators.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Runcheng Liu,Jie Yan,Jian Shi,Shouzhen Jiang,Wen Yang,Zihao Zhang,Mingshun Jiang
Tilted fiber Bragg grating-based surface plasmon resonance (TFBG-SPR) sensors, despite their portability and high sensitivity, often suffer from background interference and lack self-cleaning capabilities. Although two-dimensional materials possess the capacity to enhance sensor functionality, their integration frequently results in uneven dispersion or agglomeration of nanosheets, compromising stability and reproducibility. Herein, a novel TFBG-SPR sensor that integrates a large-area, self-supported covalent organic framework (COF) film with Ag nanoparticles (NPs) is proposed. The COF-366 film functions as a molecular sieve, selectively isolating target analytes from background molecules, thereby improving anti-interference performance. The Ag NPs generate localized surface plasmon resonance (SPR) hotspots, significantly enhancing the signal of the target analyte. Moreover, the sensor exhibits robust self-cleaning properties through SPR-driven photocatalytic degradation. These attributes collectively endow the sensor with superior anti-interference, self-cleaning, and high-sensitivity functionalities, making it suitable for reliable detection in practical applications. Experimental validation reveals that the sensor effectively eliminates background interference and maintains consistency across repeated measurements, achieving a detection limit of 1.5 × 10 –10 M for methylene blue. This work offers a promising candidate for large-scale environmental monitoring and other challenging detection scenarios, thereby expanding the application range of COF materials in advanced photonic devices.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-15
·
IF 15.7
Xu Ting,Yang Hao,Lu Tianrui,Zhong Rui,Lv Jing-Jing,Zhu Shaojun,Zhang Mingming,Wang Zheng-Jun,Yuan Yifei,Li Jun,Wang Jichang,Jin Huile,Pan Shuang,Wang Xin,Cheng Tao,Wang Shun
Creating and maintaining a favorable microenvironment for electrocatalytic CO 2 reduction reaction (eCO 2 RR) is challenging due to the vigorous interactions with both gas and electrolyte solution during the electrocatalysis. Herein, to boost the performance of eCO 2 RR, a unique synthetic method that deploys the in situ reduction of precoated precursors is developed to produce activated Ag nanoparticles (NPs) within the gas diffusion layer (GDL), where the thus-obtained Ag NPs-Skeleton can block direct contact between the active Ag sites and electrolyte. Specifically, compared to the conventional surface loading mode in the acidic media, our freestanding and binder free electrode can achieve obvious higher CO selectivity of 94%, CO production rate of 23.3 mol g −1 h −1 , single-pass CO 2 conversion of 58.6%, and enhanced long-term stability of 8 hours. Our study shows that delivering catalysts within the GDL does not only gain the desired physical protection from GDL skeleton to achieve a superior local microenvironment for more efficient pH-universal eCO 2 RR, but also manifests the pore structures to effectively address gas accumulation and flood issues.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yangkai Xiong,Zhiqiang Fang,Jipeng Li,Zheng Li,Guoqing Wang
Biological fouling seriously jeopardizes the development of the marine industry. Although hydrogels, as a kind of state-of-the-art antifouling material, have received wide attention, their mechanical strength is still relatively weak, and the synergistic antifouling method is comparatively single, thus limiting the performance of hydrogels. Here, a zwitterionic sulfobetaine methacrylate (SBMA)-acrylamide (AM)/sodium alginate (SA) double-network (DN) antifouling hydrogel with superb antifouling ability and outstanding mechanical properties was prepared by grafting MXene/Ag (M/Ag) and the powerful biocide polyhexamethylene biguanide (PHMB). The prepared M/Ag has a great bactericidal effect (99.9%), and the DN-M/Ag-PHMB hydrogel demonstrates high tensile strength (5.8 MPa), remarkable antiprotein adhesion, bactericidal, and antialgal adhesion. This work proves that the DN-M/Ag-PHMB hydrogel has an exceptional antifouling ability in all three stages of biofouling formation and has a promising future as a new type of green marine antifouling material.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Peng Zhao,Haorong Sun,Feixue Gao,Long Yu,Kangle Shang,Ming Fang,Bin Ma,Xiaoli Tan,Suhua Wang,Xiangke Wang
Rapid and accurate detection of nitrite in the aqueous environment is extremely important for ecological safety and human health. In this paper, the Raman detection of nitrite by a NiFe 2 O 4 @Ag sensor in water is enhanced by an extra magnetic field collaborated with surface plasma. Most importantly, it is demonstrated that the magnetic field enhances the Raman peak intensity through not only the effect of magnetic aggregation but also the magnetic field-induced dielectric polarization effect. In this way, the NO 2 − can be detected in a wide linear range from 10 −8 to 10 −3 mol L −1 , and the limit of detection (LOD) can reach as low as 1.25 × 10 −9 mol L −1 , which is 5.69 times lower than that in the absence of an external magnetic field. Similarly, the sensitivity under the magnetic field is 2.65 times that without the magnetic field. In addition, the sensor also shows superior detection ability to NO 2 − in real samples. Given the excellent capability of the magnetic field-enhanced Raman spectra, the reported strategy offers new thoughts on how to enhance the detection ability by an external magnetic field and show the great application potential in real water bodies.
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JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2024
·
IF 3.2
A. Anbu,M. Dilipkumar,K. Jeyajothi,M. Rajasimman,M.S. Manojkumar
In the case of the current research, an easy and effective procedure for fabricated magnetized distinguishable core-shell organized Ag–ZrO 2 /Fe 3 O 4 @TiO 2 QNCs with comprised of a magnetically charged Fe 3 O 4 core, a mesoporous ZrO 2 @TiO 2 interlayer, as well as a protective outer Ag nanoparticles wrap has been offered applying capsicum fruit extract manipulate, a chemico-pyto approach. And thereby produced Ag–ZrO 2 /Fe 3 O 4 @TiO 2 QNCs have been evaluated through TEM and SEM visuals, EDX and XRD spectrum. The fact that their photocatalytic function for the breakdown of methylene blue upon UV light was investigated. The outcomes of Ag–ZrO 2 /Fe 3 O 4 @TiO 2 nanocomposites had stronger photocatalytic abilities. The PL evaluation indicated that Ag–ZrO 2 /Fe 3 O 4 @TiO 2 composites had higher couple of electrons and holes separation effectiveness over Ag–ZrO 2 /Fe 3 O 4 @TiO 2 . On top of that, the Ag–ZrO 2 /Fe 3 O 4 @TiO 2 nanocomposites can potentially be readily segregated as well as recovered using an ambient magnetized sector, indicating their high functionality.
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MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Xinru Li,Yaoning Bai,Yuwei Yan,Taoyuan Ouyang,Xiaodi Jiang,Xu Wang,Xiaoming Cai,Jinming Cai,Honglin Tan
Metal-induced photocatalysis has been a relatively effective strategy for the efficient use of solar energy. In this paper, highly efficient and stable Ag@C/SrTiO 3 photocatalysts were prepared by compounding silver nanocubes wrapped with few layers graphite with strontium titanate materials. We obtained silver nanocubes with a uniformly dispersed size of about 35 nm by varying the surface energy of silver and inducing the preferential binding of PVP on the (100) crystal plane with the help of selective adsorption of chloride ions on the different crystal planes of silver. As obtained under the characterisation of UV–visible absorption spectra, the material has a broad visible light absorption (450–900 nm). The Ag@C/SrTiO 3 has a hydrogen reduction rate of up to 457.5 μmol g −1 ·h −1 under simulated sunlight, which is ∼200 % higher than the SrTiO 3 and ∼900 % higher than the sliver. Moreover, the catalyst was stable, still producing 93.5 % hydrogen after three cycles of testing, and the photocatalyst structure did not change as known from the XRD data of the material before and after testing. The present work demonstrates the feasibility of rational design of efficient and stable silver-based photocatalysts.
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