CERAMICS INTERNATIONAL
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2024
·
IF 5.1
Ye Xu,Qiyuan Gui,Xiaoling Peng,Jing Li,Shan Tao,Jingcai Xu,Bo Hong,Xinqing Wang
This study reports on the synthesis and electromagnetic wave-absorbing properties of Ag/Fe 3 O 4 /SiO 2 under various magnetic field intensities. The nanocomposites were prepared via a solvothermal method followed by a Stober proces, during which uniform magnetic fields were applied to induce the formation of one-dimensional nanochain structures. Results indicate that the Ag/Fe 3 O 4 /SiO 2 exhibit enhanced wave-absorbing capabilities under strong magnetic fields. Specifically, at a magnetic field of 600 mT, the composite achieves a minimum reflection loss value of −48.61 dB, accompanied by a broad effective absorption bandwidth. Furthermore, the microwave absorption performance of samples oriented horizontally along the circumference surface during preparation shows a significant improvement compared to non-oriented samples. It is attributed to the optimized electromagnetic wave transmission pathways and improved electrical conductivity and magnetic loss capabilities facilitated by the nanochain structures. Specifically, the nanochains effectively lengthen the wave propagation distance, promote charge migration, and intensify natural and exchange resonance effects. This research not only broadens the design paradigm for electromagnetic wave-absorbing materials but also offers novel strategies for their development.
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Nanoscale
·
2018
·Vol. 10
·期 12
·5532-5538
·
IF 7.233
Bi-Yun Fang,Cheng Li,Jie An,Sun-Duo Zhao,Zhi-Yong Zhuang,Yuan-Di Zhao,Yue-Xuan Zhang
In this paper, DNA containing six cytosines as the formation site for silver nanoclusters (Ag NCs) was adopted as a template for preparing fluorescent DNA-Ag NCs. For the first time, it was found that the fluorescence of DNA-Ag NCs could be quenched after hybridization with their complementary sequence. On the basis of this new phenomenon, we designed a sequence C1 that was completely complementary to human immunodeficiency virus (HIV) DNA, and probe DNA which was partially complementary to C1 for the synthesis of DNA-Ag NCs. The fluorescence of DNA-Ag NCs was quenched after hybridization with C1 and the DNA-Ag NCs/C1 composite was formed, while C1 could be dissociated away from the DNA-Ag NCs by HIV DNA through a strand exchange reaction due to the stronger affinity between HIV DNA and C1, which could switch on the quenched Ag NCs, thus a new “off–on” fluorescence method for HIV DNA detection was developed. In the experiment, the Ag NCs formation site of DNA, the number of base pairs, and the pH and salt concentration of binding buffer were optimized. Under the optimum conditions, the limit of detection for HIV DNA was obtained to be 3.18 nM (3σ/N, n = 7) with the linear range of 15–150 nM for the 150 nM DNA-Ag NCs/C1 probe. Besides, the probe showed excellent specificity to HIV DNA, and even distinguished one nucleotide mismatched HIV DNA.
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JOURNAL OF NANOPARTICLE RESEARCH
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2018
·Vol. 20
·期 1
·1-13
·
IF 2.127
Wu Jie,Zhou Yifeng,Nie Wangyan,Chen Pengpeng
This paper reported a one-step synthesis of Ag 2 S/Ag@MoS 2 nanocomposites and its applications in the surface-enhanced Raman scattering (SERS) detection and photocatalytic degradation of organic pollutants. The nanocomposites were well characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), cyclic voltammograms (CV), the Brunauer-Emmett-Teller (BET), and Fourier transforms infrared spectra (FTIR). The AgNPs were uniformly dispersed on the MoS 2 nanosheets and the particle size of the AgNPs was about 10–30 nm. These Ag 2 S/Ag@MoS 2 nanocomposites offered sensitive SERS signals for the detection of R6G with the limit of detections as low as 10 −10 M. The photocatalytic activity of the composite catalyst was studied by the degradation of methylene blue (MB) dye under light illumination. The apparent rate constant of MB degradation for the obtained catalyst could reach 6.6 × 10 −2 min −1 , indicating that the novel Ag 2 S/Ag@MoS 2 nanocomposites can be explored for organic pollutant’s detection and degradation.
One-step synthesis of Ag 2 S/Ag@MoS 2 nanocomposites for SERS and photocatalytic applications
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xiaohui Ju,Hong Gao,Chen Wang,Runtian Li,Wenqi Zhang,Hongjun Ji,Xiao Xiao,Weixing Li,Yujia Tong
A novel nanofiltration (NF) membrane is developed for efficiently separating monosaccharide from disaccharide. A hydrophilic catechol (CT)-Ag interlayer is proposed and co-deposited on a polyacrylonitrile (PAN) substrate, and then interfacial polymerization (IP) of polyethyleneimine (PEI) and trimethyl chloride (TMC) is carried out. The silver nanoparticles obtained through the reduction reaction are used to precisely regulate the unique selective structure with quinone aggregates and polyamides. The composite NF membrane achieved a pure water flux of 31.2 L m −2 h −1 at 0.5 MPa with 81.2 % sucrose rejection and 17.5 % glucose rejection. Performance evaluation in dyes, proteins, and bacteria systems also showcased the great performance of the membrane. Following the filtration of methyl orange and BSA, the flux recovery rates of the PAN/CT-Ag interlayer/PEI + TMC membrane reached 98.7 % and 98.1 %, respectively. The designed structure of silver nanoparticles in membrane enhances the anti-fouling properties through interactions with bacterial proteins. The developed membrane shows promising potential for glucose purification.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Rui Zhai,Zhenyu Wang,Mengyue Gu,Haoliang Liu,Xuewen Zhao,Jiangfan Li,Yaqiong Su,Yonghong Cheng,Shaobin Wang,Jinying Zhang
Selective photoreduction of CO 2 into ethylene is desirable but stays challenging due to easy desorption of primary reduction product CO. Herein, violet phosphorene nanosheets (VPNS) are for the first time demonstrated to be effective CO 2 photoreduction catalysts to yield ethylene. Photoelectron was found to transfer from VPNS to co-catalyst Ag and aggregated on VPNS-Ag interface to enhance CO 2 and CO* adsorption, and further lower the reduction energy barrier to yield ethylene, which was confirmed by in-situ diffuse reflectance infrared Fourier-transform, CO stripping voltammetry, CO reduction experiments, and density functional theory calculations. CO 2 is reduced into COOH* and automatically transformed into CO* on VPNS-Ag surface, then protonized into CHO* with a low barrier of 0.64 eV and automatically coupled into COCHO* to yield ethylene. Only ethylene was detected from CO 2 photoreduction with a yield of 10.34 μmol g −1 h −1 without any hole-sacrificial agent, much higher than most reported photocatalysts.
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TRANSITION METAL CHEMISTRY
·
2024
·
IF 1.6
Han Tianhang,Yao Kaisheng,Wang Zixu,Li Han,Zhao Haili
Nitroaromatic compounds are common toxic matters discharged as wastewater in varied industries. Reducing them into corresponding aromatic amines can not only decrease their contamination but also obtain value-added products, in which the preparation of catalysts with superior properties is the key. Herein, the spherical Cu-Ag architectures (ATs) are constructed via a two-step wet chemical method. First, the Cu microspheres are fabricated with the assistance of polyvinylpyrrolidone (PVP) in the mixed solution of ethylene glycol (EG) and water. Then, using them as templates, the spherical Cu-Ag ATs can be grown and constructed. The as-obtained Cu-Ag ATs have the spherical outlines assembled by many nanoparticles. The sliced Cu-Ag ATs show hollow structures and many nanothorns grow from the center to the around, combining the roughly spherical shell to build up the Cu-Ag ATs. In the reduction reaction of p -nitrophenol and p -nitroaniline, the spherical Cu-Ag ATs all exhibit excellent catalytic activities. Within 85 s and 80 s, the p -nitrophenol and p -nitroaniline can be converted completely. The prepared Cu-Ag ATs are expected to have potentials in other fields, such as electronics, sensors and so on. Graphical abstract The hierarchical Cu-Ag architectures are constructed successfully through a two-step wet chemical method, in which the rough Cu microspheres are first fabricated in aqueous EG solution, and are used as templates to direct the growth of Cu-Ag architectures. In both reduction of p -nitrophenol and p -nitroaniline, the Cu-Ag architectures exhibit high catalytic activities.
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JOURNAL OF CONTROLLED RELEASE
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2024
·
IF 10.5
Yan Dai,Jiali Zhang,Shimeng Zhang,Linhua Li,Chao Qu,Jiang Chen,Lei Lu
Bacterial keratitis is a major cause of blindness, hindered by the rising threat of antibiotic resistance. Although corneal bandage lenses (CBLs) are widely utilized in ophthalmic treatment, their effectiveness in treating bacterial keratitis remains limited due to risks of secondary infections, patient discomfort, and complications. In this study, we developed a novel biomimetic coating on CBLs by grafting Ag/Cu bimetallic nanoparticles (Ag/Cu-NPs) and thiol-functionalized heparin (Hep-SH) using a rapid polydopamine (PDA) deposition technique, effectively mimicking the ocular surface glycocalyx structure. The resulting Ag/Cu-NPs/Hep-SH coated CBLs (PNH-CBLs) exhibited significant antibacterial activity, with over 80 % reduction in Staphylococcus aureus ( S. aureus ) and 70 % in Escherichia coli ( E. coli ) due to the sustained release of Ag + and Cu 2+ , along with displaying favorable in vitro biocompatibility. Animal experiments conducted on New Zealand white rabbits with bacterial keratitis demonstrated successful treatment therapeutic outcomes, with PNH-CBLs leading to a significant decrease in clinical score. These biomimetic lenses also exhibited selective anti-protein adsorption properties, minimizing inflammation and promoting surface lubrication. Overall, this innovative approach addresses critical challenges in antibiotic resistance and offers a promising therapeutic strategy for managing ophthalmic infectious diseases.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yang Yang,Mengyao Tan,Xiaoman Li,Min Luo
The photocatalytic nitrogen reduction reaction provides an alternative process for nitrogen cycling and ammonia (NH3) production under mild conditions. Herein, we have synthesized Ag-loaded In2O3 (Ag@In2O3-X) by solvothermal and photoreduction methods. The introduction of Ag significantly alters the band structure of In2O3, resulting in a slight reduction in the band gap and a more negative conduction band position, thereby facilitating the generation of reductive electrons in In2O3. Moreover, the synergistic interaction between loaded Ag nanoparticles and In2O3 forms a Schottky barrier, which widens the light absorption range and promotes charge separation. Under simulated sunlight, the photocatalytic nitrogen fixation performance of Ag@In2O3-5 reaches 35.56 μmol h−1 gcat−1, which is higher than other composites and 3.58 times that of pure In2O3. At the same time, the catalyst has good structural stability and cycle life. Density functional theory (DFT) calculations demonstrate that Ag exhibits a stronger interaction with N2 and lowers the potential barrier of the N2 hydrogenation reaction. The synergistic effect between precious metals and semiconductors offers novel insights and presents challenges for the photocatalytic N2 fixation process. This work provides new insights and challenges for designing and synthesizing nanomaterials for photocatalytic nitrogen fixation.
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Polymers
·
2024
·Vol. 16
·期 8
·1173
·
IF 4.7
Yunkai Wang,Danlei Jing,Zikai Xiong,Yongqing Hu,Wei Li,Haotian Wu,Chuan Zuo
With the development of microelectronics products with high density and high power, it is urgent to improve the electrical and thermal conductivity of electronic paste to achieve the new requirements of packaging materials. In this work, a new synthesis method of Ag-MWCNTs was designed: Firstly, carboxylated MWCNTs and stannous chloride were used as raw materials to prepare high-loading-rate Sn-MWCNT composite material to ensure the high loading rate of metal on the MWCNT surface. Then, Ag-MWCNT composite material was prepared by the chemical displacement method to solve the problem of the low loading rate of silver nanoparticles on the MWCNT surface. On the basis of this innovation, we analyzed and compared the electrical, thermal, and mechanical properties of Ag-MWCNT composite electronic paste. Compared with the electronic paste without adding Ag-MWCNTs, the resistivity was reduced by 77%, the thermal conductivity was increased by 66%, and the shear strength was increased by 15%. Therefore, the addition of Ag-MWCNTs effectively improves the electrical, thermal, and mechanical properties of the paste, making it a promising and competitive choice for new packaging materials in the future.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Huanliang Liu,Wenqing Lai,Yue Shi,Lei Tian,Kang Li,Liping Bian,Zhuge Xi,Bencheng Lin
Bacteria in air harm the human body. Therefore, developing novel materials capable of simultaneously filtering and terminating bacteria is highly desirable. However, the filtration and inhibition performance of existing filters remain far from optimal. In this study, we combine the electrospinning technique with an in situ reduction approach to fabricate electrospun composite fibrous membranes for simultaneous bacterial filtration and termination. The results show that composite membranes with a homogenously fibrous morphology are successfully prepared. Furthermore, the dual antibacterial agents silver nanoparticles (Ag) and graphene oxide nanosheets (GO) are uniformly encapsulated within the fibers. The tensile strength and elastic modulus of the electrospun composite membranes reach 1.04 and 10.23 MPa, respectively. In addition, the results show that the composite membranes exhibit excellent interception efficiency of over 99.9 % against the gram-positive bacteria S. aureus . The electrospun composite membranes also exhibit high antibacterial activity against E. coli , S. aureus , K. pneumoniae , C. albicans , and B. subtilis, achieving antibacterial efficiency of over 99.99 %. Electrospun composite membranes with bacterial filtration and termination properties may have great potential for use in personal protective equipment and indoor and outdoor air purification.
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BIOSENSORS & BIOELECTRONICS
·
2024
·
IF 10.7
Lin Fan,Lijun Kong,Hao Liu,Jiawei Zhang,Mengdi Hu,Li Fan,Hongliang Zhu,Shancheng Yan
Ag and Cu based nanostructures serve as advanced functional materials for biomedical applications , due to their unique properties. Here, we proposed a novel neurotransmitter biosensing method based on Ag–Cu composite nanozyme , synthesized through the soft film plate method. Supported by the soft film template , the Ag–Cu nanozymes were stably kept to an ultrafine 2D structure with high monodispersity, which provided a large specific surface area and sufficient binding sites , leading to controllable and improved dual-nanozyme activities over similar-sized mono-Ag and mono-Cu, and up to 4.95 times of natural enzyme-level. The multi-path enzymatic reaction processes catalyzed by Ag–Cu composite nanozymes were firstly theoretically discussed in detail, according to the theoretical redox potential of redox couples in the reaction systems. On this basis, the Ag–Cu filled nanonets based neurotransmitter biosensing is successfully applied in rapid detection for glutathione and dopamine, possessing a linear range of 10∼100 μM and 1–10 μM, and a detection limit of 3.01 μM and 0.29 μM, respectively, which exhibited superior performance for biomedical purposes over most commercially available products in speed and precision.
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Nanomaterials
·
2024
·Vol. 14
·期 10
·848
·
IF 4.4
Jun Wu,Gaofeng Shao,Xiaodong Wu,Sheng Cui,Xiaodong Shen
A novel Cr-doped BaTiO3aerogel was successfully synthesized using a co-gelation technique that involves two metallic alkoxides and a supercritical drying method. This freshly prepared aerogel has a high specific surface area of over 100 m2/g and exhibits improved responsiveness to the simulated sunlight spectrum. Methyl orange (MO) was chosen as the simulated pollutant, and the results reveal that the Cr-doped BaTiO3aerogel, when modified with the noble metal silver (Ag), achieves a pollutant removal rate approximately 3.2 times higher than that of the commercially available P25, reaching up to 92% within 60 min. The excellent photocatalytic performance of the Ag-modified Cr-doped BaTiO3aerogel can be primarily attributed to its extensive specific surface area and three-dimensional porous architecture. Furthermore, the incorporation of Ag nanoparticles effectively suppresses the recombination of photo-generated electrons and holes. Stability and reusability tests have confirmed the reliability of the Ag-modified Cr-doped BaTiO3aerogel. Therefore, this material emerges as a highly promising candidate for the treatment of textile wastewater.
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