COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Shuying Yang,Fan Zhang,Jinping Zhao,Haijiao Kang,Qing Ke
Silver/titanium dioxide (Ag/TiO 2 ) nanoparticles, renowned as effective inorganic antibacterial agents with a wide spectrum of activity and minimal resistance induction, encounter challenges when incorporated into organic substrates. This integration often leads to particle aggregation, resulting in a substantial reduction in antibacterial efficacy. This study devised a novel approach involving loading Ag/TiO 2 nanoparticles onto polyurea microcapsules (PUMC), forming hybrid-shelled microcapsules (Ag/TiO 2 -PUMC) using silane coupling agents. The preparation of polyurea microcapsules offers the advantages of rapid synthesis and mild reaction conditions, facilitating industrial-scale production. Additionally, loading Ag/TiO 2 nanoparticles onto polyurea microcapsules helps alleviate the aggregation issue, and the organic nature of polyurea microcapsules enhances compatibility with organic substrates. Characterization techniques, including SEM, TEM, FTIR, XRD, UV–visible absorption spectroscopy, EPR and thermogravimetric analysis, were employed to confirm the successful grafting of Ag/TiO 2 nanoparticles onto the PUMC. A comparative analysis between the two silane coupling agents, KH550 and KH792, revealed that the dual amino-functional silane coupling agent, KH792, played a pivotal role in chain extension during the microcapsule self-polymerization process. The antibacterial activity of the Ag/TiO 2 -PUMC was evaluated against Escherichia coli and Staphylococcus aureus . Remarkably, the hybrid-shelled microcapsules exhibited outstanding antibacterial efficacy, achieving a 99.99% antibacterial rate within just 0.5 hours. This performance surpassed unmodified Ag/TiO 2 nanoparticles, highlighting the enhanced antibacterial efficacy of the hybrid-shelled microcapsule structure. This study presents a successful synthesis strategy for inorganic/organic hybrid-shelled antibacterial microcapsules and provides valuable insights for refining inorganic antibacterial agents. The demonstrated approach holds substantial promise for advancing the field of organic antibacterial materials.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Jiawei Wang,Ruirui Qiang,Qiaowei Miao,Ruiling Hu,Huihui Chen,Shaobo Guo,Zhifeng Liu
With antibiotic resistance on the rise due to misuse, the urgent need for new antibacterial materials has become paramount in global health. Herein, a CuFe 2 O 4 /MoS 2 (CFM) composite with a large specific surface area was synthesized through a simple hydrothermal method and physical adsorption, and the subsequent loading of silver nanoparticles (Ag NPs) onto its surface yielded the nanocomposite CuFe 2 O 4 /MoS 2 @Ag (CFMA) with a rough defect-rich surface. The nanocomposite demonstrates remarkable antibacterial activity against Escherichia coli , Staphylococcus aureus , and drug-resistant Salmonella ( T-Salmonella ) by releasing metal ions that alter the electrical potential of bacterial cell membranes, compromise the integrity of cell membranes, and produce reactive oxygen species that lead to oxidative stress. It thus achieves an antibacterial rate of 96 % against the three tested bacterial strains within just 20 min at a concentration of 200 μg/mL. The composite exhibits a broad-spectrum antibacterial effect against Gram-negative and Gram-positive bacteria, as well as drug-resistant bacteria. Moreover, CFM acts as a carrier that effectively prevents the aggregation of Ag NPs, and the magnetism of CuFe 2 O 4 facilitates the recovery of the antibacterial agent. This work provides new ideas and methods for the development of highly efficient, cost-effective, and biocompatible antibacterial materials.
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ADVANCED POWDER TECHNOLOGY
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2025
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IF 4.2
Xinyu Cai,Yiduo Chen,Dandan Wang,Zhongming Su,Weiting Yang
Here, a biomass-based composite interfacial evaporation system utilizing a Ti-MIL-125-NH 2 /Ag (Ti-MIL-125/Ag; MIL-125/Ag) catalyst was successfully developed, which innovatively achieved synergistic enhancement of photothermal conversion and photocatalytic degradation. Initially, the precisely engineered Ag nanoparticles-modified Ti-MIL-125-NH 2 significantly enhanced visible-light absorption capacity and charge carrier separation efficiency. Furthermore, a Bam@MIL-125/Ag three-dimensional porous interfacial evaporator was constructed using eco-friendly and low-cost bamboo substrate through the sodium alginate gelation. At a height of 1.5 cm, 5 wt% of Ag loading, and a content of 20 mg of Ti-MIL-125/Ag in the Bam@MIL-125 evaporator, the Bam@MIL-125/Ag system under 1 kW·m −2 simulated sunlight demonstrated an evaporation rate of 1.45 kg·m −2 ·h −1 and a solar-to-vapor conversion efficiency of 81.2 %. Notably, leveraging photo-generated free radicals from Ti-MIL-125/Ag, the Bam@MIL-125/Ag evaporator achieved efficient removal (98.67 %) of volatile organic compounds (VOCs) in water through the photocatalytic degradation process. Furthermore, when operating continuously for 56 h in a 3.5 wt% NaCl solution, the Bam@MIL-125/Ag evaporator maintained an evaporation rate above 1.4 kg·m −2 ·h −1 , demonstrating excellent stability, salt resistance, and heavy metal removal capabilities in practical applications. This work provides an innovative strategy for designing MOF-based evaporators that combine high-performance water production with advanced purification functionality.
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OPTICAL MATERIALS
·
2025
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IF 4.2
Yanbing Zheng,Dongying Liu,Honghui Gai,Fanhui Lin
A novel surface-enhanced Raman scattering (SERS)-imprinted membrane is engineered through a synergistic integration of SERS technology and molecular imprinting technology (MIT). Polyamide (PA-6) serves as the supporting membrane due to its mechanical properties and is further modified with UIO-66 (NH 2 )–Ag as SERS substrates. Molecular imprinted polymers (MIPs) are synthesized to produce the SERS imprinted membrane (Ag/PA-6/UIO-66(NH 2 )@MIPs membranes, APU-MIMs) for selective detection of rhodamine B (RhB). It is reflected from the results that APU-MIMs exhibits excellent SERS performance with high sensitivity and specific recognition ability, reaching a detection limit of 10 −12 M. The APU-MIMs also presents the advantages of non-destructiveness, good stability and recyclability. Overall, it pioneers a novel synthetic strategy for fabricating SERS membranes with superior analytical performance, thereby expanding the practical scope of SERS-based sensing technologies.
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CATALYSIS LETTERS
·
2025
·Vol. 155
·期 8
·1-12
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IF 2.4
Ma Xueqin,Shen Liuwei,Shi Gaolei,Zhang Xingguang
The selective oxidation of 5-hydroxymethylfurfural (HMF) to value-added products plays an important role in biomass catalytic transformation, which essentially depends upon design of highly efficient and selective catalysts. This study aims to identify contributions of silanols (Si-OH groups) on Ag/USY catalysts to regulating catalytic performances in selective oxidation of HMF to HMFCA (5-hydroxymethyl-2-furancarboxylic acid), by means of aluminium tri-sec-butoxide (AlBO) modification to suppress Si-OH groups of USY and 2,6-di-tert-butylpyridine (2,6-DTBPy) selective poison to shield Brønsted acid sites in the reaction system. The catalysts are characterized by XRD, BET, TEM, XPS and FT-IR to examine the crystal structures, surface areas, porosity, morphology, Ag distribution, chemical states, and surface adsorptive properties. The HMF conversion (44-49.2%) slightly changes with increasing AlBO content, whereas the HMFCA selectivity gradually goes down from 56.2 to around 22.1% and the levulinic acid (LA) selectivity minorly raises from 5.6 to 12.8%. The production of LA originates from enhanced Brönsted acid sites after AlBO modification, and the decline of HMFCA selectivity is principally attributed to the suppression of Si-OH groups that weakens the interaction between HMF reactants and catalysts. This work provides new insights into the role of surface modification in tailoring metal and zeolite-based catalysts for organic conversions. Graphical
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ACS Applied Polymer Materials
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2025
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IF 4.7
Chuangxin Huang,Xin Liu,Zhan Gao,Shangwan Fu,Jianli Meng,Qi Chen,Qiuliang Wang
Titanium (Ti) implants face significant challenges due to bacterial infections and thrombosis caused by surface biofouling, often leading to implantation failure. Hence, we developed an accelerated codeposition strategy to functionalize Ti surfaces with zwitterionic poly(sulfobetaine methacrylate) (PSBMA) and silver nanoparticles (AgNPs) for enhanced antibiofouling and antibacterial properties. In this approach, AgNO3 served a dual role: (1) as an oxidant to accelerate dopamine polymerization and PSBMA codeposition, reducing reaction time from 24 to 4 h and (2) as a precursor for in situ synthesis of uniformly distributed AgNPs via phenolic hydroxyl reduction. The optimized Ti/PDA–PSB@Ag0.15 coating exhibited superior and robust antibacterial performance, achieving >99.9% inhibition against both E. coli and S. aureus, while the cytotoxicity assays confirmed high L929 fibroblast viability (>90%), ensuring biosafety. In addition, the zwitterionic polymer contained in the Ti/PDA–PSB@Ag0.15 coating provided superhydrophilicity and outstanding protein resistance, reducing 85% of both bovine fibrinogen (BFG) and bovine serum albumin (BSA) adsorption compared to unmodified Ti. Finally, the modified Ti substrates demonstrated minimal hemolysis ratio (<3%), reduced platelet adhesion, and prolonged activated partial thromboplastin time (APTT), indicating excellent hemocompatibility and strong anticoagulant properties. Thus, this work presents a rapid, scalable method to engineer multifunctional Ti implants with synergistic antifouling and bactericidal capabilities, offering significant potential for clinical applications in orthopedic, dental, and cardiovascular devices.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Qingyan Han,Hao Zhang,Andrey Kaplan,Shixing Fan,Yazhou Xu,Chengyun Zhang,Wei Gao,Enjie He,Jun Dong
Surface-enhanced Raman scattering (SERS) with ultrahigh sensitivity has garnered significant attention for quantitative analysis and chemically specific detection. However, conventional SERS platforms, typically structured by depositing plasmonic micro/nanoparticles onto rigid substrates, face limitations in further advancement and applications. In this study, we present a novel method to prepare a flexible SERS film substrate composed of graphene overlayer (G) atop a self-assembled array of silver micropopcorns (Ag MPs) and a polymethyl methacrylate (PMMA) membrane. We show that adding an overlayer of graphene improves substantially overall SERS performance. This flexible G/Ag MPs/PMMA film substrate achieves a detection limit as low as 100 picomolar for rhodamine 6G (Rh6G) molecules and identifies mixtures containing Rh6G (10 −11 M) and crystal violet (CV, 10 −6 M) molecules. Furthermore, the flexible SERS structure enables quantitative detection of thiram, achieving a detection limit of 0.005 ppm, well below the allowable limit in food. This study provides a robust SERS platform that advances fundamental research and facilitates the development of practical applications in quantitative analysis, detection, and biological sensing. Combining graphene and Ag MPs on a flexible PMMA substrate offers a versatile and scalable approach to enhancing SERS performance, paving the way for future innovations.
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Materials Today Communications
·
2025
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IF 4.5
Nanqing Zhang,Xianhua Bian,Zhenglong Zhu,Xin Huang,Ping-an Yang
To effectively absorb electromagnetic waves and reduce the impact of electromagnetic radiation on the health of residents and the normal operation of electronic devices, core-shell nanocomposite fibers (Fe NWs@SiO 2 @Ag) were successfully prepared by the liquid-phase hydrolysis method. The microwave absorption properties of core-shell nanocomposite nanofibers with different ratios were tested and analyzed using the coaxial method. The results show that the sample with a molar ratio of Fe:SiO 2 :Ag of 1:0.1:1 has the best comprehensive performance. This sample exhibits excellent microwave absorbing performance. When the mass filling fraction is 25 wt%, its minimum reflection loss (RL min ) can reach −61.55 dB, and the effective absorption bandwidth (EAB) can reach 3.52 GHz. The excellent microwave absorbing performance can be attributed to the interfacial polarization effect of the core-shell nanocomposite structure, the magnetic loss and conduction loss of each layer of materials, and the small-scale effect caused by the one-dimensional structure. This study can provide a methodological reference for the preparation of high-performance absorbing materials.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2025
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IF 4.6
Ziwen Yang,Boyang Guo,Keyan Liu,Zhi Zhu,Donglai Han,Cong Wang,Jing Song
Although surface enhanced Raman spectroscopy (SERS) has become a powerful analytical technique for ultrasensitive molecular detection, it still faces challenges including instability, unrepeatability, and non-recyclable. The rational design and fabrication of SERS substrates that are simultaneously stable, reproducible, and recyclable remains a critical yet unmet need. Here, we present a flexible polyimide-silver (PI/Ag) nanofiber-based SERS platform, synthesized via electrospinning and in-situ reduction techniques. The spatial distribution and density of Ag nanoparticles (NPs) were precisely regulated by tuning the type and concentration of reducing agents, which effectively modulated the localized surface plasmon resonance (LSPR) effect to optimize SERS performance. Among the tested formulations, the PI/Ag-NB substrate—prepared using NaBH 4 as the reducing agent—exhibited the most favorable nanoparticle dispersion and the strongest SERS activity. Using 4-aminothiophenol (4-ATP) as a probe molecule, the PI/Ag-NB substrate achieved a maximum enhancement factor (EF) of 1.17 × 10 7 . Beyond its high sensitivity, the substrate demonstrated broad spectral responsiveness, enabling the reliable detection of diverse analytes such as methylene blue (MB), methyl violet (CV), Congo red (CR) and malachite green (MG). To further validate its practical utility, long-term stability, and recyclability, the substrate was employed for the detection of 2,4-dichlorophenoxyacetic acid (2,4-D) pesticide residues both in aqueous solutions and soil extracts. Notably, the substrate stored for 30 days maintained performance over 10 consecutive detection cycles, their robustness and reproducibility. The platform achieved a measured detection limit of 10 −10 M, with a theoretical limit reaching as low as 3.12 × 10 −11 M, highlighting the ultrasensitive detection capability of the substrate. Collectively, these findings establish PI/Ag-NB nanofibers as a versatile and high-performance SERS platform, paving the way for their practical applications in environmental monitoring, food safety, and chemical sensing.
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Molecular Catalysis
·
2025
·
IF 4.9
Xiaoyan Xiang,Jincheng Liu,Bingjie Li,Wenxin Yang,Zewei Liao,Wei Cai,Yijun Luo,Yanxiong Fang
The selective oxidation of inert C H bonds via sustainable photocatalytic methods represents a critical advancement in green chemistry. This research develops VO 2 -Ag nanocomposites for the selective photocatalytic oxidation of cyclohexane to KA oil (cyclohexanol/cyclohexanone) under mild conditions, addressing the inefficiency, high energy consumption, and over-oxidation of conventional methods. Oxygen-deficient VO 2 nanorods were synthesized solvothermally, followed by in situ photoreduction to deposit uniformly dispersed silver nanoparticles (Ag NPs) with the diameter of 6∼8 nm onto the VO₂ nanorod surface with the length of 500∼600 nm. The VO 2 -Ag synergy integrates three key features: (1) VO 2 oxygen vacancies modulating reactant adsorption, (2) Ag NP localized surface plasmon resonance (LSPR) enhancing visible-light absorption, and (3) a Schottky heterojunction promoting charge separation. The optimized VO 2 -Ag 40 composite achieved 9.17 % cyclohexane conversion and 95.04 % KA oil selectivity under visible light in 12 h, significantly outperforming pure VO 2 . Mechanistic studies identified h + , ·O 2 − , and ·OH as key active species. Enhanced activity stems from LSPR-broadened light absorption, Schottky-minimized charge recombination, and vacancy-optimized intermediate adsorption. This work highlights the potential of interfacial engineering and defect modulation in designing high-performance photocatalysts for sustainable hydrocarbon valorization, offering a scalable strategy for green chemical synthesis.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 6
·1-11
·
IF 5.3
Cheng Yuliang,Zhao Yajie,Li Peizhen,Yu Hang,Xie Yunfei,Guo Yahui,Yao Weirong,Qian He
As one of the most extensively used antibiotics in aquaculture in China, enrofloxacin (ENR) tends to accumulate in human body and endanger people’s health. Rapid, sensitive, and facile assays for enrofloxacin are urgently needed. In this study, based on the solid-phase substrate preparation strategy combined with microsphere etching and magnetron sputtering, Ag@Au nanoparticle (Ag@Au NP) solid array (Ag@Au NSA) with high surface-enhanced Raman spectroscopy (SERS) enhancement factor (EF≈8.3 × 10 7 ) was developed. Finite-difference time-domain (FDTD) simulations revealed that the Ag@Au NSA achieved maximum electromagnetic enhancement (EM) under the following optimized conditions: 633 nm excitation wavelength, 7.9 nm Au shell thickness, and 30.5 nm Ag core size. Additionally, SERS mapping results confirmed both the excellent enhancement performance and signal reproducibility of Ag@Au NSA, due to the expected micro-region enhancement with long-term effects accompanied by a larger range of high-density “hot spots.” The proposed SERS sensing for ENR based on Ag@Au NSA had a limit of detection (LOD) of 0.076 ng/mL ( R 2 ≈ 0. 9991) and was further applied to real-sample detection of ENR in crayfish tail meat with good recoveries ranging from 91.36 to 112.60%, indicating its great potential in practice. Graphical
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CHEMOSPHERE
·
2019
·
IF 5.108
Ying Zeng,Na Guo,Xingjian Xu,Yong Yu,Quanying Wang,Na Wang,Xuerong Han,Hongwen Yu
WO 3 @MoS 2 /Ag (HW@MA) hollow tubes were successfully engineered to photodegrade bisphenol A (BPA) combined with peroxymonosulfate (PMS) for the first time. XRD, XPS, TEM and SEM were conducted. The HW@MA tubes present excellent photocatalytic performance on the removal of BPA. The intermediate products of BPA were investigated by GC-MS analysis and the degradation pathway was proposed. To explore the transferred mechanism of photoproduced carriers, the electron paramagnetic resonance (EPR) technique was carried out. The results revealed that the superoxide radical ( O 2 − ), hydroxyl radical ( OH), sulfate radical ( SO 4 − ) were the main active radicals. Moreover, the formed schottky junctions enhanced the separation efficiency of photoinduced electron-hole pairs. Besides, the effect of the photocatalysts’ dosage, PMS concentration, pH of the initial solution and co-existing anions on the BPA degradation were investigated.
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