CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Rui Wang,Xin Song,Tao Xiang,Qiang Liu,Baihai Su,Weifeng Zhao,Changsheng Zhao
A straightforward mussel-inspired approach was proposed to construct chitosan-polyurethane coatings and load Ag nanoparticles (AgNPs) to endow polyethersulfone (PES) membranes with dual-antibacterial and antifouling properties. The macromolecule O -carboxymethyl chitosan (CMC) was directly reacted with catechol in the absence of carbodiimide chemistry to form the coating and load AgNPs via in situ reduction; while lysine (Lys) was used as a representative small molecule for comparison. Then, PEG-based polyurethane (PU) was used for constructing Lys-Ag-PU and CMC-Ag-PU composite coatings, which substantially improved the protein antifouling property of the membranes. Furthermore, the CMC-Ag-PU coating exhibited superior broad-spectrum antibacterial property towards E. coli and S. aureus than Lys-Ag-PU coating. Meanwhile, the CMC-Ag-PU coating showed sustained antifouling property against bacteria and could reload AgNPs to be regenerated as antibacterial and antifouling coating. This approach is believed to have potential to fabricate reusable antifouling and antibacterial coatings on materials surfaces for aquatic industries.
研究领域:
材料科学
·
生物医学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2012
·Vol. 159
·期 12
·B850
·
IF 2.59
Xiao-Hong Cao,Ming-Ming Zhang,Yun-Hai Liu,Wen-Bin Nie
A novel amperometric hydrogen peroxide microcavity electrode (MCE) was fabricated based on sulfhydryl-containing multiwalled carbon nanotubes/silver nanoparticle (MWNTs-SH/AgNPs) nanohybrids. Due to the synergistic amplification property of the MWNTs-SH/AgNPs, The modified MCE (MWNTs-SH/AgNPs/MCE) shows a dramatic electrocatalytic effect on the reduction of hydrogen peroxide. The results showed that MWNTs-SH/AgNPs/MCE exhibited linear dependence on H2O2 concentration in the range between 1.0 × 10−5 and 1.1 × 10−3 mol/L with a correlation coefficient of −0.9996. The detection limit (signal-to-noise ratio S/N = 3) was 1.7 × 10−6 mol/L. The response in the current to coexisting interferences on the MCE surface is almost negligible. This novel microsensor has high potential in detection of hydrogen peroxide in biological environments.
研究领域:
生物传感
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材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 94
·期 10
·3375-3383
·
IF 2.659
Ruishan Han,Xin Song,Qianhua Wang,Yushun Qi,Guozhi Deng,Aiyong Zhang,Qinian Wang,Fangyuan Chang,Chao Wu,Yuanyuan Cheng
BACKGROUND Graphene-supported nanocomposites are promising catalysts for their unique properties. Biosynthesis of such hybrid catalysts possesses several advantages over other methods such as less pollution. The palladium nanoparticle has versatile catalytic activities and its stability and activities can be significantly improved through hybridization with other nanomaterials including graphene. RESULTS In this study, bimetallic palladium-silver nanoparticles supported on graphene (Pd-Ag/rGO) was prepared through one-step biosynthesis using a bacterium Shewanella oneidensis MR-1. Shewanella oneidensis MR-1 synthesized Pd-Ag/rGO through simultaneous reduction of silver nitrate (AgNO 3 ), palladium(II) nitrate (Pd(NO 3 ) 2 ) and graphene oxide (GO). The morphology and composition of the Pd-Ag/rGO were characterized by transmission electron microscopy, energy dispersive X-ray, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy and Raman spectroscopy. Furthermore, the hydrogenation activity of synthesized Pd-Ag/rGO was tested using 4-nitrophenol as a model chemical at room temperatures and pressure. The Pd-Ag/rGO showed the best catalytic performance when Pd/Ag ratio was 1:1 and bacterial concentration was 1.0 of OD 600 (optical density measured at a wavelength of 600 nm) for the preparation of Pd-Ag/rGO. Therefore, the kinetic rate constant for 4-NP reduction was 0.2413 min −1 catalyzed by as-prepared Pd-Ag/rGO, which is listed as one of the top level reported catalysts for 4-NP reduction. CONCLUSION Therefore, this study demonstrated a material and energy-saving method to synthesize hybrid nanoparticles supported on graphene with high catalytic activity. © 2019 Society of Chemical Industry
研究领域:
微生物学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Engineering Materials
·
2023
·
IF 0
Liang He,Xiaoming Shao,Ming Tian,Wencai Wang
Superhydrophobic surfaces present promising potential for improving the mechanical and chemical durability of electromagnetic interference (EMI) shielding materials. However, integrating superhydrophobicity and EMI shielding is still a challenge due to the complex structural design. Herein, superhydrophobic and highly durable fabrics with excellent EMI shielding effectiveness were fabricated. First, the meta-aramid nonwoven fabrics were functionalized by a polydopamine layer. Then, with the assistance of the metal-binding ability of polydopamine, silver nanoparticles were immobilized on the fiber surface by electroless plating. Finally, after the introduction of fluorine-containing agents via a facile dipping method, a superhydrophobic surface was successfully obtained. The as-prepared fabrics showed excellent EMI shielding effectiveness of 111 dB due to superior electrical conductivity (234 S/cm). Moreover, thanks to the low surface energy of fluorine-containing molecules as well as the micro-nanoroughness created by the stacking of silver nanoparticles, the composite fabrics exhibited a large water contact angle of 152° and a low sliding angle of 5°. It was noted that the composite fabrics still maintain superhydrophobicity and high EMI shielding effectiveness (110 dB) even after the acid and alkali corrosion, bending, abrading, and salt fog test, respectively, demonstrating their durability under harsh environments.
研究领域:
材料科学
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纺织工程
·
电磁学
✓ 已验证
DOI
Journal of Nanotechnology
·
2020
·Vol. 2020
·期 1
·8828878
·
IF 0
Theint Theint Win,Sikandar Khan,PengCheng Fu
The scientific consensus is now on developing a biocontrol agent that can cause cellular metabolic reprogramming against agricultural pathogens. Biosynthesis of silver nanoparticles was performed by using phytopathogenic fungi ( Alternaria sp.) isolated from banana cultivated soil. Alternaria sp. can grow very fast and produce high enough bioactive compounds. This study aims to biosynthesize silver nanoparticles (AgNPs) using fungal Alternaria sp.’s metabolites as a safe antifungal agent against plant pathogenic fungi ( Fusarium spp. and Alternaria sp.). To visualize the formation of AgNPs, analytical instruments were used, such as ultraviolet-visible (UV-Vis) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, scanning transmission electron microscopy (STEM), energy dispersive X-ray (EDX), and elemental mapping. The UV-visible spectra showed a peak at 435 nm. Analysis of scanning transmission electron microscopy (STEM) micrographs evidenced that the size of synthesized silver nanoparticles ranged between 3 and 10 nm. The resulting AgNPs showed distinct antifungal activity against selected plant pathogenic fungi. Synthesized AgNPs have demonstrated remarkable potential for the use of antifungal compounds to combat plant diseases.
研究领域:
微生物学
·
纳米生物学
·
植物病理学
✓ 已验证
DOI
Heliyon
·
2023
·
IF 4
Xin Jiang,Weilong Zhou,Wei Wang,Zichun Le,Wen Dong
Miniaturized and pure static devices are expected to be used in laser-imaging systems for speckle reduction. In this study, a pure static device based on polymer-stabilized liquid crystal (PSLC) doped with Ag nanowires was developed to effectively suppress laser speckles. The concentrations of the polymer and Ag nanowires in the PSLC were optimized, and then the PSLC devices were fabricated. A measurement system was set up to characterize the electro-optical properties of the fabricated PSLC devices. Subsequently, a laser projection system was built to demonstrate the speckle-reduction performance. Moreover, the degree of scattering and response time of the developed PSLC devices were investigated and discussed. A PSLC doped with 0.02 wt% Ag nanowires and 3 wt% polymer having a device size of 2 × 2 × 0.1 cm 3 was demonstrated to produce a speckle-reduction efficiency of 51.4 % under very low driving voltages. The experimental results verified effectiveness and superiority of the developed speckle reduction method based on PSLC doped with Ag nanowires.
研究领域:
光学材料
·
显示技术
·
纳米科技
✓ 已验证
DOI
高影响因子
NANO
·
2015
·
IF 1.09
XIAOLEI SI,GUANGLIANG CHEN,ZHILI CHEN,JUN HUANG,SHIHUA CHEN,SYLVAIN MASSEY
In this paper, a highly catalytic and nanosized Ag / Co 3 O 4 composite for rhodamine B ( RhB ) degradation was fabricated by using the co-precipitation method at room temperature. The Ag / Co 3 O 4 structure and catalytic properties were characterized through scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) gas-sorption measurements, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-Vis spectroscopy. The results showed that the Co 3 O 4 nanosheets prepared by hydrothermal synthesis mainly exposed (2 2 0) and (1 1 1) facets, which played an important role in determining its catalytic oxidation performance. The Co 3 O 4 nanosheets doped with Ag nanoparticles by a simple silver-mirror reaction exhibited a stable and well-dispersed property in dye solution. Compared to the Ag and Co 3 O 4 nanostructure, the Ag nanoparticles with bigger diameter (10 nm) on Co 3 O 4 surface also readily produced surface-active oxygen species and exhibited a higher catalytic activity for the degradation of RhB solution (5 mg ⋅ L -1 ) under the visible light. The kinetic constant K of Ag / Co 3 O 4 catalyst for RhB degradation reaction was evaluated to 0.02724 min -1 , which is relatively higher than those reported in the literatures.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Food Measurement and Characterization
·
2023
·Vol. 18
·期 1
·95-104
·
IF 3.4
Sun Xi,Liu Feng,Xue Xiao
Ensuring food safety necessitates rapid and reliable food contaminant detection methods. Here, we present a novel approach that integrates electrochemical sensors with machine learning to detect Sudan Red I in food. Our study showcases a modified stainless steel needle (SSN) electrode adorned with silver nanoparticles (AgNPs) and investigates three distinct convolutional neural network (CNN) architectures: Inception V1, ResNet-50, and SqueezeNet V1.1. This combination aims to predict the sensor response accurately. The AgNPs/SSN electrode displays heightened electrochemical activity towards Sudan Red I, offering a linear detection range of 0.1–20 μM and an exceptional 10 nM detection limit. Notably, the Inception V1 and ResNet-50 networks exhibit superior predictive capability compared to SqueezeNet V1.1. Our interdisciplinary approach establishes a rapid, sensitive, and dependable detection system for food contaminants. By fusing electrochemical sensors with machine learning, we propel the development of intelligent detection systems with significant implications for food safety enhancement. Graphical abstract
研究领域:
食品科学
·
分析化学
·
人工智能
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Liang Zhang,Xinyue Wang,Tingting Zhang,Chengzhan Liu,Dehua Li,Shuangxi Xing
Taking full advantage of both silver and nitrogen-doped carbon (N-C) with finely designed nanostructure is a great challenge in achieving excellent electrocatalysts for oxygen reduction reaction (ORR). The Janus nanostructure composed of Ag nanoparticles (NPs) and N-C with individual exposed surface meets this purpose quite well. This can be achieved via pyrolyzing the core-shell Ag@polypyrrole (Ag@PPy) with eccentric encapsulated structure, where the AgNPs locate away from the center of the PPy spheres. The as-synthesized Janus nanostructured Ag@N-C demonstrates comparable ORR activity to commercial Pt/C catalyst with an onset and half-wave potential of 0.955 V and 0.821 V vs. RHE, respectively, and a limited current density of 4.976 mA cm −2 at 0.365 V, and it also illustrates better stability and stronger methanol tolerance. The excellent ORR activity is largely attributed to the synergistic effect originating from the interaction between AgNPs and carbonized PPy half-shell, where the former one leads to a higher disordered degree in the carbon layer and the latter results in the positive shift of Ag 3 d binding energy to facilitate the active oxygen adsorption and keeps the AgNPs from aggregation to avoid activity losing.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Yan Cao,Zipeng Xing,Zhenzi Li,Xiaoyan Wu,Mengqiao Hu,Xu Yan,Qi Zhu,Shilin Yang,Wei Zhou
3D mesoporous black TiO 2-x /Ag nanosphere coupled with 2D g-C 3 N 4 sheet ternary heterojunctions are successfully fabricated through a facile evaporation-induced self-assembly (EISA) process and photodeposition method, followed by a mild calcination (350 °C) under an argon atmosphere after an in situ solid-state chemical reduction strategy. The resultant mesoporous black TiO 2-x /Ag/g-C 3 N 4 ternary heterojunctions with narrow band gap of ∼ 2.27 eV possess a relative high specific surface area of ∼ 100 m 2 g −1 , main pore size of 6.2 nm and the highest visible-light-driven photocatalytic property for degradation of methyl orange (97%) and methylene blue (99%). The apparent reaction rate constants (k) of mesoporous black TiO 2-x /Ag/g-C 3 N 4 for methyl orange and methylene blue are ∼ 9 and 11 times higher than that of pristine TiO 2 . The possible mechanism is proposed, and the excellent photocatalytic property can be ascribed to the introduction of Ti 3+ self-doping and g-C 3 N 4 , which favor the visible light absorption and the separation of electron-hole pairs, the surface plasma resonance effect of Ag nanoparticle, and the mesoporous networks offer more surface active sites.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 36
·8560-8569
·
IF 5.16
Xingwang Lan,Yiming Li,Cheng Du,Tiantian She,Qing Li,Guoyi Bai
Graphical Carboxylation catalysts : Porous carbon nitride frameworks with uniform and rich nitrogen dopants and abundant porosity were successfully fabricated through the carbonization of the covalent triazine frameworks at different pyrolysis temperatures, and used as supports to immobilize and stabilize Ag nanoparticles for catalytic CO 2 conversion (see picture). Porous carbon nitride frameworks (PCNFs) with uniform and rich nitrogen dopants and abundant porosity were successfully fabricated through the direct carbonization of the covalent triazine frameworks (CTFs) at different pyrolysis temperatures and used as supports to anchor and stabilize Ag nanoparticles (NPs) for catalytic CO 2 conversion. Importantly, the pyrolysis temperature plays a crucial role in the properties of porous carbon nitride frameworks. The material carbonized at 700 °C showed the highest surface area and micro- and mesoporous structure with a certain interlayer distance. Taking advantage of their unique surface characteristics, PCNF-supported Ag NP catalysts (Ag/PCNF- T , T =pyrolysis temperature) were prepared by a simple chemical method. A series of characterizations revealed that Ag NPs are embedded in the porous carbon nitride frameworks and confined to a relatively small size with high dispersion owing to the assistance of the abundant surface groups and porous structures. The as-obtained Ag/PCNF- T catalysts, especially Ag/PCNF-700, showed excellent catalytic activity, selectivity, and stability for the carboxylation of CO 2 with terminal alkynes under mild conditions. This can be due to the existence of abundant nitrogen atoms and diverse porosity, which resulted in highly efficient catalytic activity and stability.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
LETTERS IN ORGANIC CHEMISTRY
·
2024
·Vol. 22
·期 1
·56-60
·
IF 0.7
Xin-Yu Lin,Guo-Jun Chen,Su-Zhe Wu,Ke-Xuan Xu,Xiao-Tian Zhang,Qi Feng
4-Hydroxyquinoline-2(1H)-ones exhibit multiple biological activities, and studying their synthetic methods is of great significance. In the presence of tetramethylguanidine and silver nitrate, 4-hydroxyquinoline-2(1H)-ones were efficiently synthesized from 2-ethynylanilines and carbon dioxide under atmospheric pressure. The reaction conditions, such as types of silver catalysts and reaction solvents, were optimized, and the applicability of the substrate was preliminarily investigated. This method provides an alternative pathway for the synthesis of 4-hydroxyquinoline-2(1H)-ones and the conversion and utilization of carbon dioxide.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）