Materials Today Communications
·
2024
·
IF 3.7
Hu Li,Jun Guo,Chao Gao,Mingxi Pan,Congqing Yang,Yingying Peng,Hui Huang
The rapid advancement of social information substantially expands the application range of electromagnetic technology and leads to a significant increase in electromagnetic wave pollution. In this study, silver ions undergo sensitization, activation, and subsequent reduction processes, the silver shell is formed on SiO 2 matrix. Microstructure, morphology, and electromagnetic wave absorption performance of as-prepared Ag@SiO 2 and SiO 2 were explored. When the Ag content reaches 10 wt%, the shells achieve a dense coating on the matrix. The results demonstrate that the Ag@SiO 2 (10 wt%) composite achieves a remarkable reflection loss of −52.48 dB and an absorption bandwidth of 2 GHz, at an absorber thickness of 5.3 mm and a frequency of 4.96 GHz. Compared to the reflection loss of −2.5 dB exhibited by SiO 2 , it showcases excellent electromagnetic wave absorption capability. Such significantly enhanced absorption capability of Ag@SiO 2 composites can be attributed to local surface plasmon resonance behavior induced at the interface. This study elucidates the electromagnetic wave absorption mechanism of the Ag@SiO 2 composite and successfully demonstrates its potential as a high-performance composite for electromagnetic wave absorption. Consequently, it provides a feasible solution to address the challenges associated with electromagnetic pollution.
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高影响因子
Journal of the Iranian Chemical Society
·
2024
·
IF 2.2
Fan Zhen,Li Chunxia,Xu Meijie
ZnO/Ag nanocomposite was prepared via in situ method by using silver nitrate and ZnSO 4 as the raw material. ZnO and ZnO/Ag were characterized by utilizing SEM, UV-vis, XRD, FTIR, and so on. The photocataytic degradation behaviors of ZnO and ZnO/Ag for trimethylamine (TEA) in air and solution were studied. The results indicated that ZnO/Ag had better photocatalytic degradation properties on trimethylamine under the condition of 0.06 g catalyst, 2 h photocatalytic time, and 15 A light intensity, and the degradation rates of TEA were up to 44 and 67% in air and solution, respectively. Furtherly, ZnO and ZnO/Ag also indicated perfect photocatalytic degradation properties toward to organic compounds in wastewater. Especially, the harmless treatment of triethylamine was achieved by using photocatalytic degradation method that provided a novel method for treating triethylamine. In all the above results leaded to a good application prospect of ZnO/Ag in the degradation of organic compounds in air and solution.
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DALTON TRANSACTIONS
·
2025
·
IF 3.3
Wangqiong Xu,Qiling Li,Shubiao Xia,Zhe Li,Feixiang Cheng,Shimei Guo
Surface coating is an effective approach for realizing the commercialization of cathode materials. Nowadays, ionically conducting surface coatings are commonly used to improve the electrochemical stability of LiMn2O4. In this work, LiMn2O4 cathodes decorated with in situ formed Ag nanoparticles with high electronic and ionic conductivity are prepared via a simple calcination process. The detailed microstructural mechanism of the influence of Ag on the electrochemical performance enhancement of spinel LiMn2O4 is uncovered by spherical-aberration-corrected (Cs-corrected) scanning transmission electron microscopy (STEM). The results demonstrate that the Ag coating helps to promote the transport of Li+ and strengthen the cycling stability by alleviating the decomposition of the electrolyte and manganese dissolution. Accordingly, the capacity retention rate of the optimized 5 wt% Ag/LiMn2O4 sample reached 80% after 900 cycles with an initial discharge-specific capacity of 100 mA h g−1 at 5 C (1 C = 148 mA h g−1). This work indicates that Ag coating is a promising technology for producing high-energy density lithium-ion batteries.
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PubMed
高影响因子
Coatings
·
2024
·Vol. 14
·期 7
·887
·
IF 2.9
Shuilin Wang,Fanping Meng,Zhimin Cao
Implants and other medical devices are prone to bacterial infections on their surface due to bacterial attachment and biofilm formation. In this study, silver nanoparticles were generated in situ onto regulated synthesized polydopamine particles, and the optimal amount of silver nitrate was determined. Composite micro–nano particles were then deposited on a titanium alloy surface. X-ray photoelectron spectroscopy and energy-dispersive X-ray spectroscopy were used to confirm that the titanium alloy surface was successfully coated with PDA-Ag. Scanning electron microscopy, transmission electron microscopy, and three-dimensional optical profilometry were utilized to analysis the morphology of the micro–nano particles and the surface morphology after deposition. The diameters of the polydopamine particles and silver nanoparticles were 150 nm and 25 nm, respectively. The surface roughness values decreased from 0.357 μm to 25.253 μm because of the coated PDA-Ag. Morphology and chemical composition analyses of the modified surface indicated that the PDA-Ag particles were uniformly bonded to the substrate surface. Antimicrobial assays illustrated that the PDA-Ag-modified surface possessed resistance againstEscherichia coliandStaphylococcus aureusattachment, with an effectiveness of 96.14 and 85.78%, respectively. This work provides a new strategy and theoretical basis for tackling medical-related surface infections caused by bacterial adhesion.
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Materials Research Express
·
2024
·Vol. 11
·期 6
·065403
·
IF 1.8
Hongfeng Lin,Jianhong Chen,Zhongyan Zhang,Yuxu Wang
In the current study, Fe3O4/Ag nanohybrids demonstrating high efficiency in liver cancer ferroptosis therapy and MR imaging were synthesized using a facile one-pot approach. Subsequently, their morphology, chemical composition, structure, Fenton reaction activity, and magnetic resonance (MR) contrast effect were systemically assessed. Importantly, the in vitro studies demonstrated that the Fe3O4/Ag nanohybrids had a high therapeutic efficiency in treating liver cancer cells and performed exceptionally well during T2-weight MR imaging. Correspondingly, these Fe3O4/Ag nanohybrids demonstrate significant potential for use in the field of biomedicine.
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APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
Fajia Liu,Hu Liu,Xiaoyun Li,Huanyu Zhao,Danping Zhu,Yingying Zheng,Chaorong Li
The antibacterial and photocatalytic PVC film was prepared by doping heteronanostructure of TiO 2 nanowire@Ag nanoparticles. TiO 2 nanowire with 50–60 nm in diameter and 0.1 mm in length was prepared by a hydrothermal method, and Ag nanopartical about 5–10 nm in diameter was grafted on the surface of TiO 2 nanowire evenly in the solution. The antimicrobial ability and the photocatalytic properties of the nano-TiO 2 @Ag/PVC film were systematically investigated by changing the influence factors such as the content of nano-TiO 2 @Ag, pH value and the cultivation condition. It confirmed that the nano-TiO 2 @Ag nanostructure could increase the antibacterial efficiency of the PVC film. Further, nano-TiO 2 @Ag/PVC film also showed enhanced photocatalytic activity to decompose Rhodmine B (RhB).
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Jia-Feng Xu,Jia-Cheng Wu,Lu-Jiong Ruan,Wei Tian,Xi Yan,Yan Chen,Xiao-Jing Guo,Wan-Zhong Lang
Coupling photocatalysis with membrane separation technology becomes one pioneering method to solve the membrane fouling . In this study, Ag@SnS photocatalyst was synthesized and blended with polyvinylidene fluoride (PVDF) to fabricate Ag@SnS/PVDF composite membranes via non-solvent induce phase separation (NIPS) method. The results show that with the addition of Ag@SnS, water flux of Ag@SnS/PVDF hybrid membranes increases due to the enhanced membrane hydrophilicity and increased porosity. The optimal hybrid membrane (MAS-2) exhibits the rejection rate of 97.0 % and 95.4 % for BSA and HA accompanied with a water permeance of 578.5 L m −2 h −1 bar −1 . Moreover, MAS-2 membrane reveals excellent self-cleaning ability by photodegradation of HA on membrane surface , and its flux recovery rate (FRR) can achieve 91.7 % after UV irradiation and 95.8 % after 3 h natural sunlight irradiation via photocatalysis regeneration. The heterostructure of Ag@SnS can assist separation of photoinduced electrons and holes by transferring photoinduced electrons to Ag nanoparticles with enhanced photocatalytic activity. After three cycles, the FRR can still reach around 90.0 %, revealing its outstanding cleaning ability. Therefore, the Ag@SnS/PVDF membranes have a foreseeable potential in the field of water treatment due to its high flux performance, self-cleaning ability via photocatalysis process.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Xiaofei Yan,Zhaoyang Gao,Yehua Shao,Dongming Qi,Bei Wu,Shirong Guo
The frequent occurrence of respiratory infectious diseases has made it difficult for traditional antibacterial materials to meet practical needs in recent years. There was an urgent need to develop new antimicrobial materials with stronger antimicrobial effects and biosafety. In this paper, the carboxymethyl chitosan (CMCTS)/silk fibroin (SF) composite microspheres were synthesized through self-assembly, and the Ag + /CMCTS/SF composite microspheres were prepared by loading the Ag + onto their surface. It investigated the effect of CMCTS contents, SF on the size and secondary structure of CMCTS/SF composite microspheres, and the antibacterial activity and mechanism of Ag + /CMCTS/SF composite microspheres. The results showed that the average particle size distribution size of CMCTS/SF composite microspheres was ranged from approximately 593–1115 nm. When CMCTS was added at 50 wt%, the content of β -sheet structures in silk fibroin microspheres was the largest at 38.6%. And the CMCTS/SF composite microspheres loaded with Ag + enhanced the bactericidal rate against Escherichia coli and Staphylococcus aureus by 27.51% and 36.39%, respectively. In addition, the Ag + /CMCTS/SF composite microspheres have high biological safety, providing a new method for designing an efficient, green, and safe composite antibacterial agent.
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ChemistrySelect
·
2024
·Vol. 9
·期 27
·e202303733
·
IF 1.9
Yao Gu,Dongjian Shi,Liang Wang,Mingqing Chen
Graphical A range of Fe 3 O 4 /Ag/BiVO 4 /sepiolite composite materials, featuring varying Fe 3 O 4 concentrations, were synthesized utilizing the co-precipitation method. The inherent magnetic characteristics of Fe 3 O 4 , combined with the resultant Z-type heterojunction structure, confer exceptional photo-catalytic prowess upon the material. This enables swift degradation of rhodamine B, and furthermore, facilitates its retrieval for subsequent reuse. To increase specific surface area and light utilization of photo-catalysts, a series of Fe 3 O 4 /Ag/BiVO 4 /sepiolite composites with different Fe 3 O 4 contents were synthesized via co-precipitation. The structure, composition, and optical properties of these composites were characterized using X-ray diffraction (XRD), nitrogen adsorption and desorption (BET), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), and fluorescence spectroscopy (PL). The photo-catalytic activity of the composites was further evaluated using rhodamine B as a model for photo-catalytic degradation. The results revealed that the composites with optimal Fe 3 O 4 loading exhibited the narrowest bandgap width, approximately 2.13 eV, and the highest electron-hole pair separation efficiency. Rhodamine B could be almost completely degraded within a short illumination time in the presence of the Fe 3 O 4 /Ag/BiVO 4 /sepiolite composites. The degradation mechanism of rhodamine B was proposed to involve the improvement of the photo-catalytic activity of the resulting composites by the Fe 3 O 4 and the Z-type heterojunction structure. Additionally, the composites could be recycled and reused multiple times, making them an environmentally friendly and sustainable option.
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Food Bioscience
·
2024
·
IF 4.8
Jiaxin Wen,Yuxin Guo,Xiangyu Li,Bingyang Wang,Huifang Wang,Xianghua Gao,Baolong Niu,Wenfeng Li
Antimicrobial packaging films are an effective means to avoid food infections. PVA has good film-forming and mechanical properties, but its water resistance and antimicrobial properties are insufficient. In this study, a rod-shaped Ag-MOF with photocatalytic properties was synthesized as an antimicrobial agent by a hydrothermal method using citrate esterified PVA as a film-forming substrate. The MICs of Ag-MOF against Escherichia coli and Staphylococcus aureus were 16 μg/mL and 32 μg/mL, respectively, and it had good biocompatibility. Under blue light irradiation, Ag-MOF induced the production of ROS, which increased the inhibition rate by more than 83.78%. The antimicrobial mechanism experiments showed that it caused irreversible damage to the bacterial cell membrane through the synergistic effect of Ag + and ROS. The best mechanical properties of the films were obtained at 3% citric acid content, with the water vapor transmission rate, water solubility and swelling rate reduced by 0.19 g·mm·m −2 ·h −1 ·kPa −1 , 65.33% and 11.26%, respectively. The antimicrobial rate of the composite film could reach more than 98% by adding only 1 MIC of Ag-MOF. In conclusion, photocatalytic antimicrobial agents have great potential for application in food packaging.
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JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
·
2025
·Vol. 113
·期 8
·e35616
·
IF 3.4
Shengkai Liu,Hongji Wang,Siqi He,Xiaoyu Li,Liying Cui,Zhongkai Liu,Xiaoshuai Wang,Mengqi Liu,Yujie Fu,Zhiguo Liu
In this study, chlorogenic acid (CGA), a natural organic acid, was employed as both a reducing and stabilizing agent to synthesize chlorogenic acid-functionalized silver nanoparticles (CGA-AgNPs). The synthesis conditions of CGA-AgNPs, including reactant ratio, pH, temperature, and reaction time, were optimized. The synthesized CGA-functionalized AgNPs were characterized by ultraviolet–visible (UV–Vis) spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). TEM imaging results indicated that CGA-AgNPs were spherical nanoparticles with an average diameter of 36.70 ± 0.65 nm. FTIR spectroscopy results confirmed that CGA was covered on the surface of AgNPs. XPS results indicated that the surface of nanoparticles was made up of Ag atoms. The inhibitory activity of CGA-AgNPs against Candida albicans ( C. albicans ), Acinetobacter baumanniiand ( A. baumannii ), and Staphylococcus aureus ( S. aureus ) was measured and evaluated by the inhibition circle method and the minimum inhibitory concentration. The synthesized CGA-AgNPs under optimal conditions indicated good antibacterial activity against C. albicans, A. baumannii , and S. aureus with MIC values of 36.95 ± 0.22 μg/mL and MBC values of 73.90 ± 0.22 μg/mL. In summary, this study provides a facile and green synthesis method to prepare CGA-AgNPs with excellent antibacterial activities.
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高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Lifang Zheng,Changsheng Feng,Yan Wang,Feiyue Ge,Lijun Hu,Yue Chen,Fang Cheng,Xue-Jun Wu
Silver nanocrystals (NCs) possess excellent localized surface plasmon resonance features, and recent studies have revealed the great impact of crystallinity on their optical properties. However, the synthesis of highly monodisperse single-crystalline Ag nanocrystals (SC-Ag NCs) still encounters challenges, which require the elimination of undesirable defective NCs. Herein, we present a templated transformation method for the preparation of SC-Ag NCs with the assistance of Cu ions. The evolution from Ag2S to Ag NCs is driven by heterogeneous nucleation of the Ag on the surface of Ag2S NCs with the strong coordination effect of the alkylphosphine. The method is highly applicable for SC-Ag NCs with tunable sizes as well as SC-AgAu-alloyed NCs with an adjustable composition. The as-obtained SC-Ag NCs exhibit superior optical properties and enable enhanced performance in molecular sensing and Raman enhancement, compared to multitwinned counterparts with a similar size. This methodology contributes to the development of SC plasmonic NCs and broadens their applications in sensing, photonics, and catalysis.
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