MICROCHEMICAL JOURNAL
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2026
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IF 5.2
Xinyi Zhang,Jiaxin Lu,Yan Wang,Chunning Chen,Hongkun Zhao,Jingtong Zhai,Rui Li,Nan Lu
A three-dimensional superhydrophobic porous pyramidal silicon decorated with silver nanoparticles was developed for high-performance SERS detection. • The hierarchical porous structure enhances light absorption and plasmonic “hot spots”. • The superhydrophobic surface enables efficient analyte enrichment by reducing the droplet contact area and mitigating the coffee-ring effect. • The substrate exhibits excellent sensitivity, high enhancement factor, and outstanding reproducibility. • It was successfully applied for the sensitive detection of trace pollutants in real samples. Surface-enhanced Raman scattering (SERS) enables label-free detection with molecular fingerprinting, but its application is often limited by complex fabrication processes and nonuniform signal distributions. To address these issues, we developed a three-dimensional superhydrophobic substrate consisting of porous pyramidal Si decorated with silver nanoparticles (PP-Si@AgNPs). Compared with the conventional Si@AgNPs and Py-Si@AgNPs, the hierarchical structure enhances light absorption to 78% at 532 nm and increases the specific surface area exposed under the laser spot. The superhydrophobic surface (152.6°) reduces the droplet contact area by 88.6%, increasing the surface density of analyte molecules by 8.8-fold and enhancing the SERS intensity by 7.85-fold. Using rhodamine 6G as a probe molecule, the substrate presents a detection limit of 10 −13 M and an enhancement factor of 5.85 × 10 9 . The relative standard deviations of 3.34% and 6.39% indicate excellent spot-to-spot and batch-to-batch reproducibility. Moreover, the substrate enables low-concentration detection of malachite green in fish skin extract (7.8 × 10 −11 M), thiram in apple extract (1.6 × 10 −8 M), and melamine in milk (1.0 × 10 −8 M), highlighting strong potential for practical analytical applications. Download: Download high-res image (50KB) Download: Download full-size image
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Zhengguo Wu,Wei Zhou,Weijie Deng,Changliang Xu,Yun Cai,Xiaoying Wang
Wound bleeding and infection are two of the major threats to patients’ lives, but developing safe materials with high hemostasis efficiency and antibacterial activity remains a major challenge. Silver nanoparticles (AgNPs) are suitable as antibacterial agents in the hemostatic process, but the application is hampered because of easy accumulation of toxicity. Herein, thiol-modified chitosan (TMC) was prepared by modifying with mercaptosuccinic acid and then was used to immobilize AgNPs to obtain composite sponges (TMC/AgNPs) for stemming the bleeding and preventing infection. TMC/AgNPs sponges had complex interlaced tubular porous structure with high porosity (99.42%), indicating high absorption. TMC had high immobilization efficiency for AgNPs—the release rate of AgNPs was 14.35% after 14 days—but the TMC/AgNPs sponge still had excellent antibacterial activity against Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa. In vitro and in vivo experiments confirm that the TMC/AgNPs sponge had fast and efficient hemostatic performance in comparison with the PVF sponge, and its possible mechanism was the synergistic effect of high blood absorption capacity and the interaction between amino, sulfydryl, and blood cells. Furthermore, the TMC/AgNPs sponge can promote wound healing by preventing wound infection, while the PVF sponge cannot. More importantly, the sponges had good safety due to the immobilization of TMC for AgNPs.
研究领域:
生物材料学
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医学工程
·
药剂学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Simin Wang,Huijuan Xiu,Dingwen Yin,Jinbao Li,Gengmei Liu,Yuxin Qin,Feiguo Hua,Qingjun Meng,Minzhe Wu,Mengxia Shen
Achieving high shielding effectiveness in electromagnetic shielding materials relies heavily on high conductivity, yet simultaneously enhancing the absorption loss remains a persistent challenge. Consequently, the study successfully creates efficient electromagnetic shielding composite films with a unique grape-like bunch structure of hollow nanosilver (HCAF) through layer-by-layer assembly. The utilization of poly(dopamine) (PDA) to anchor nanosilver granules (AgNPs) onto cellulose nanofibers (CNF) results in the formation of CNF@PDA@AgNPs. Subsequently, a surface protection etching method is employed to etch the AgNPs, resulting in hollow nanosilver (H-AgNPs) and the generation of CNF@PDA@H-AgNPs. A composite film featuring a grape bunch structure is fabricated by interweaving high aspect ratio CNF with CNF@PDA@H-AgNPs. A substantial quantity of H-AgNPs creates an abundant interface, while the grape bunch structure establishes an efficient conductive network. That enables the composite film to exhibit excellent impedance matching, excellent conductivity loss, abundant polarization loss, and multiple reflection loss. Therefore, the conductivity of the composite film with a thickness of 148.8 μm reaches 212660 S/m, with SET, SEA, and SER 89.56, 79.03, and 10.53 dB in the X band, significantly better than the 76.9, 55.55, and 21.41 dB of the solid AgNPs composite film. The composite film also exhibits remarkable thermal conductivity (The coefficients of in-plane and out-plane thermal conductivity are 4.61 and 0.17 W/(m·K), respectively), mechanical properties, and strain sensing capabilities, making it significant potential for applications in flexible electronics and other related fields.
研究领域:
材料科学
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纳米技术
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电磁干扰屏蔽
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柔性电子
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热管理
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传感器
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DOI
高影响因子
ENVIRONMENT INTERNATIONAL
·
2019
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IF 7.943
Qing-Lin Chen,Dong Zhu,Xin-Li An,Jing Ding,Yong-Guan Zhu,Li Cui
Growing evidences have demonstrated that heavy metal contamination can promote the proliferation of antibiotic resistance genes (ARGs) via co-selection. However, effects of nano-metal-materials on the occurrence and level of ARGs in the soil and plant, have not been fully explored. To gain insights into this impact, we conducted a pot experiment by adding nano‑silver particles (AgNPs) as a stimuli and Ag ion (AgNO 3 ) and tetracycline as a comparison. By using high throughput quantitative PCR, our results indicated that application of AgNPs (~20 nm and ~50 nm) at a concentration of 100 ppm resulted in no significant changes in the abundance of ARGs in either soil or phyllosphere ( P > 0.05). Nevertheless, the overall pattern of resistome, especially in soil, was shifted following AgNPs application, with a significance increase in the relative abundance of efflux pumps genes, which is an important mechanism for co-selection of ARGs by heavy metals. By comparison, Ag ion at an equivalent Ag mass of AgNPs markedly increased ARGs abundance and shifted ARGs profile in soil, indicating that free Ag ion had a stronger impact on ARGs than AgNPs. These findings provide new insights in assessing the risks of manufactured nanomaterials accumulated in the environment.
研究领域:
环境科学
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微生物学
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土壤学
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植物科学
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DOI
PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
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2020
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IF 5.88
Qimeng Jiang,Bichong Luo,Zhengguo Wu,Xiaoying Wang
Silver nanoparticles (AgNPs) have been widely used for sterilization due to their broad-spectrum bactericidal properties. However, there exist the problems of premature releasing and accumulative toxicity when free AgNPs are applied. This study proposed a one-pot hydrothermal strategy to synthesize carbon spheres immobilized silver nanoparticles (AgNPs@CS). The synthesis involves with silver ammonia solution as Ag precursor, and corn stalk as green reducing agent and carbon precursor. Furthermore, AgNPs@CS was anchored by cellulose nanofibers (CNF) to obtain the antibacterial composite paper. The obtained CNF/AgNPs@CS paper exhibited superior antibacterial properties against E. coli and S. aureus . Notably, the accumulative release rate of AgNPs from AgNPs@CS was 10.2% in 9 days, while that from CNF/AgNPs@CS paper was only 6.7% due to the anchoring effect of both CS and CNF, which was low for avoiding the cumulative toxicity problem. In addition, the mechanical and barrier properties of CNF/AgNPs@CS paper were also improved by 29.4% (tensile index), 2.7% (tear index), 7.4% (burst index), 10% (folding endurance), 0.8% (water vapor transmission) and 9.4% (oxygen transmission rate), respectively. Therefore, the composite paper has potential application as a medical antibacterial material.
研究领域:
材料科学
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微生物学
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DOI
高影响因子
Polymers
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2024
·Vol. 16
·期 5
·648
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IF 4.7
Qing Li,Hongyu Gong,Xiang Jia,Ran Wang,Zhiwei Liu,Lexin Zhang,Jisheng Li,Tifeng Jiao
Silk fibroin (SF) has excellent biocompatibility and is one of the most commonly used polymer materials. However, SF fibers have serious drawbacks as antibacterial materials due to their lack of stability and bacterial resistance. Therefore, it is of paramount significance to enhance the stability and bolster the bacterial resistance of SF fibers. In this study, SF fibers were fabricated and loaded with Ag nanoparticles (AgNPs) to improve the antimicrobial properties of the fibers. The impact of reduction conditions on the size of AgNPs was also investigated. In an antibacterial test, the fibers that were prepared exhibited over 98% bacterial resistance againstStaphylococcus aureus(S. aureus) andEscherichia coli(E. coli). Therefore, as an efficient antibacterial material, these fibers are expected to become a candidate material in medical and textile fields. This study offers a novel approach for the utilization of SF fibers in the realm of antibacterial applications.
研究领域:
生物材料学
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医学
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纺织科学
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DOI
PubMed
高影响因子
Materials
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2024
·Vol. 17
·期 5
·1214
·
IF 3.1
Jiabao Wu,Xinpeng Chen,Aijing Li,Tieling Xing,Guoqiang Chen
Synthetic dyes are prone to water pollution during use, jeopardizing biodiversity and human health. This study aimed to investigate the adsorption and photocatalytic assist potential of sodium lignosulfonate (LS) in in situ reduced silver nanoparticles (AgNPs) and chitosan (CS)-loaded silver nanoparticles (CS-LS/AgNPs) as adsorbents for Rhodamine B (RhB). The AgNPs were synthesized by doping LS on the surface of chitosan for modification. Fourier transform infrared (FT-IR) spectrometry, energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were used to confirm the synthesis of nanomaterials. The adsorption and photocatalytic removal experiments of RhB were carried out under optimal conditions (initial dye concentration of 20 mg/L, adsorbent dosage of 0.02 g, time of 60 min, and UV power of 250 W), and the kinetics of dye degradation was also investigated, which showed that the removal rate of RhB by AgNPs photocatalysis can reach 55%. The results indicated that LS was highly effective as a reducing agent for the large-scale production of metal nanoparticles and can be used for dye decolorization. This work provides a new catalyst for the effective removal of dye from wastewater, and can achieve high-value applications of chitosan and lignin.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2021
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IF 7.514
Zhengguo Wu,Shuwei Tang,Weijie Deng,Jiwen Luo,Xiaoying Wang
The cumulative toxicity of AgNPs has limited their application in food packaging. As such, the quest for AgNPs should focus on controlling their release to reduce the cumulative toxicity. Here, two kinds of green hydrothermal carbonized methods were used to treat sulfhydryl-modified chitosan to obtain two kinds of carbon spheres/AgNPs (Glutinous rice sesameballs-like AgNPs-SMCS and dragon fruit-like SMCS-Ag), which exhibited good stability and high immobilization efficiency for AgNPs, and the release of total Ag from AgNPs-SMCS and SMCS-Ag were only about 5.63% and 3.59% after 14 days, respectively. Subsequently, they were added into chitosan separately to prepare chitosan-based films. Two carbon spheres/AgNPs regulated the microstructure of chitosan-based films because of the electrostatic interaction and the micro-nanometer filling behavior, thus further immobilized the AgNPs. Importantly, the films presented good antibacterial activity and excellent safety. These results will provide a theoretical basis for the green and safe design of AgNPs antibacterial agent.
研究领域:
食品科学
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材料科学
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生物技术
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Leipu Zhao,Cui Du,Chen Zhou,Shasha Sun,Yuanzheng Jia,Jiasheng Yuan,Guangming Song,Xin Zhou,Qian Zhao,Shengyang Yang
Currently, the development of membranes with efficient absorption of solar light has enabled the evaporation and purification of water using solar energy. However, the resolution of the dilemma between the water evaporation rate and the ultradeep removal of contaminants remains a challenge. Here, we report a structurally ordered AgNPs@C3N4/GO (SCG) membrane with both vertical channels and layer nanostructures, which enhance the water evaporation rate and facilitate the removal efficiency of contaminants simultaneously. The water evaporation rate increases by ∼3.5 times in the presence of the SCG membrane, leading to an optothermal conversion efficiency of 77% under a low solar intensity (1 sun) and high humidity (∼65%). More importantly, the as-prepared SCG membrane is capable of clearing diverse contaminants and salts, including dyes, pathogens (e.g., bacteria, viruses, parasites), and metal ions (e.g., Cd2+, Pb2+, Cr2+, Na+, K+, Mg2+, Ca2+), with an extremely high removing efficiency. We envisage that the ordered structure in both vertical and horizontal directions can achieve a large mass flux and highly efficient decontamination. Therefore, it can be expected that the scale-up fabrication of solar absorbers with tailorable nanostructures for thorough wastewater purification and seawater desalination can help people who live in regions with a scarcity of clean water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Yongwei Cai,Hong Yang,Jianxiang Li,Ronghua Gu,Yuhang Dong,Qi Zhao,Yao Chen,Yuanju Li,Ruru Wang
Catheter-associated urinary tract infections (CAUTI) account for 40% of all hospital-acquired infections and more than 1 million CAUTIs occur annually in the United States and Europe with increased morbidity and mortality. Although anti-bacterial coating is an effective way to solve this problem, so far only limitted progress has been made. In this paper we prepared a novel antibacterial silver nanoparticles poly(acrylamide)-chitosan-polyvinylpyrrolidone (AgNPs-PAAm-CS-PVP) composite hydrogel coating on latex urinary catheters by a simple dipping method. The average particle size, the size distribution as well as the polydispersity index (PDI) value of the AgNPs were examined by using TEM analysis. The surface morphology and roughness, the element contents, the functional groups, the static contact angles, and the surface energy of the coatings were characterized by using SEM, EDS, AFM, FTIR, XPS, and a video optical contact angle instrument, respectively. The amount of the total Ag released from the hydrogel was tested by ICP-MS. The antibacterial and antiadhesion efficacies against Gram-negative E. coli of the coated urinary catheters were evaluated with an inhibition zone test and fluorescence microscopy. A synergistic antibacterial mechanism of AgNPs and CS was also presented. The results showed that the synthesized AgNPs in the hydrogel had a spherical shape with an average diameter of 25.9 nm. The AgNPs-PAAm-CS-PVP hydrogel had a more durable release of the antibacterial agents of AgNPs and Ag + , which explains why the coated urinary catheters had long-term antibacterial activity. The mathematical modelling of Ag release kinetics supported Case I or Fickian diffusion mechanism for the AgNPs-PAAm-CS-PVP hydrogel. The hydrogel-coated urinary catheters became smoother and more hydrophilic which further explains why the coated urinary catheter decreased bacterial adhesion. More importantly, bacterial activity and bacterial adhesion assays showed that both the outer and inner surfaces of the AgNPs-PAAm-CS-PVP hydrogel-coated urinary catheters had strong antibacterial property against E. coli . Furthermore, the hydrogel-coated urinary catheters showed high hemocompatibility and cytocompatibility for promising biomedical applications. The AgNPs-PAAm-CS-PVP hydrogel-coated urinary catheters have great potential for decreasing CAUTIs.
研究领域:
材料科学
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生物材料
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生物医学工程
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传染病学
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纳米技术
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产品关联
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Jie Yang,Xin-Yan Huang,Rong-Zhi Zhao,Tong Gao,Jia-Chang Ruan,Shen-Qi Han,Lei Wang,Jin-Biao Shu,Xue-Feng Zhang
en Silver nanoparticles (AgNPs) are extensively employed for electromagnetic interference (EMI) shielding owing to their remarkable conductivity, and are commonly incorporated into polymer matrices. Therefore, the uniformity of the AgNP distribution within the polymer matrix is a crucial factor that affects the EMI shielding performance. This study demonstrates the impact of the surface morphology of AgNPs on the uniformity of the filling in electromagnetic interference shielding patches. The AgNPs were synthesized through a liquid-phase reduction process, regulating the surface shape by thermal treatment at varying temperatures. The morphology transitioned from a flower-spherical shape to a coarse-strip shape when the heat treatment temperature increased from 20°C to 250°C. The morphological alteration of the AgNPs was ascribed to the interplay between their surface effects and sintering kinetics. The results indicated that after heat treatment at 100°C, AgNPs with a spherical surface morphology demonstrated remarkably superior filling uniformity. The EMI patch containing AgNPs subjected to heat treatment at 100°C demonstrated superior EMI shielding efficacy. Its efficacy was further validated in practical electronic equipment by applying surface electromagnetic radiation scanning techniques. These findings offer significant insights into the practical design of EMI shielding patches for real-world applications using the morphology-regulated filling uniformity method. 摘要 zh 银纳米颗粒因其优异的导电性能已被广泛应用于电磁屏蔽领域,并且通常需要与高分子基体混合后使用。其中,作为填充剂的银纳米颗粒在基体中的分布均匀性是调控电磁屏蔽性能的关键影响因素之一。本研究通过液相还原法制备了银纳米颗粒,采用不同温度的热处理工艺调控其表面形貌,并系统分析了银纳米颗粒表面形貌对电磁屏蔽贴片中填充均匀性的影响。实验表明,当热处理温度从20°C升至250°C时,银纳米颗粒的表面形貌从花状球形逐渐转变为粗糙条状,这种表面形貌变化源于其表面效应与烧结动力学的相互作用。在经过100°C热处理后的银纳米颗粒具有球形表面形貌,并且展现出最优异的填充均匀性,因此,采用100°C热处理银纳米颗粒的电磁屏蔽贴片呈现出优异的电磁屏蔽性能,并进一步通过表面电磁辐射扫描法在电子设备中验证了其在实际应用中的优异性能。该研究结果为实际应用中通过形貌调控填充均匀性设计高性能电磁屏蔽贴片提供了重要参考依据。
研究领域:
材料科学
·
纳米技术
·
电磁干扰屏蔽
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产品关联
DOI
高影响因子
Journal of Functional Biomaterials
·
2022
·Vol. 13
·期 4
·303
·
IF 4.901
Qihan Yuan,Qianqian Zhang,Xuecheng Xu,Yuqing Du,Jidong Xu,Yu Song,Yuanfei Wang
Enamel demineralization around brackets is a relatively common complication of fixed orthodontic treatment, which seriously affects the aesthetics of teeth. In this study, a novel orthodontic adhesive containing polycaprolactone–gelatin–silver nanoparticles (PCL–gelatin–AgNPs) composite fibers was prepared to prevent enamel demineralization of orthodontic treatment. First, PCL–gelatin–AgNPs fibers film prepared by electrospinning was made into short fibers and added to traditional orthodontic adhesives (Transbond XT, 3M Unitek) in three different ratios to design a series of composite adhesives containing antibacterial materials. The antimicrobial performance of the control product and the three samples were then evaluated by bacterial live/dead staining, colony-forming unit (CFU) counts, tensile bond strength (TBS), and adhesive residue index (ARI) scores. The composite adhesives’ antimicrobial properties increased with the increasing content of PCL–gelatin–AgNPs short fibers. The addition of complex antimicrobial fibers to 3M Transbond XT adhesive can significantly reduce the CFU of bacterial biofilms (p< 0.05). The bacterial survival rate on the surface of the specimen decreased with the increase of PCL–gelatin–AgNPs short fibers (p< 0.05). The TBS and ARI values (n= 10) indicated that adding PCL–gelatin–AgNPs short fibers had no significant adverse effect on adhesion. Therefore, adding PCL–gelatin–AgNPs short fibers makes it possible to fabricate orthodontic adhesives with strong antibacterial properties without compromising the bonding ability, which is essential for preventing enamel demineralization around the brackets.Keywords:PCL–gelatin–AgNPs fibers;orthodontic adhesive;antibacterial property;tensile bonding strength;Streptococcus mutans
研究领域:
牙科材料
·
正畸学
·
生物材料
·
抗菌研究
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）