FOOD CHEMISTRY
·
2025
·
IF 9.8
Yunpeng Shao,Yue Niu,Wenlong Deng,Zicheng Zhang,Ruien Yu,Linyu Mei
In this study, we prepared large-area polydimethylsiloxane (PDMS) 3D flexible films deposited with silver nanoparticles (Ag NPs) by assembling Ag NPs on ordered micron-column (MC) arrays fabricated using SU-8 colloidal lithography (Ag NP@SU-8-MC). The large-scale, highly ordered 3D MC array flexible film offers numerous adsorption sites for densely packed Ag NPs. High-density sub-nanometer gaps between Ag NPs create spatial hot spots, enhancing the electromagnetic field. The results indicate that this flexible substrate achieves a detection limit of 10 −15 M for rhodamine 6G (R6G), with a relative standard deviation of less than 8 %, demonstrating excellent SERS sensitivity and uniformity. Furthermore, leveraging its high viscosity and flexibility, the ‘pasting-extraction’ method was employed to detect carbendazim and thiram on the surfaces of tomatoes and apples, achieving detection limits of 10 −10 M and 10 −11 M, respectively. Overall, this work presents a practical approach for preparing flexible and sensitive SERS substrates for food safety applications.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Mingyin Zhang,Qifan Zhang,Dongjie Zhang,Zhenhuan Tian,Qiang Li,Feng Yun
A versatile surface-enhanced Raman spectroscopy (SERS) substrate capable of responding to excitation by both visible and ultraviolet (UV) lasers is challenging. Herein, an ultrasensitive and long-term stable SERS substrate suitable for both visible and UV excitation is realized by a structure of hexagonal boron nitride (hBN) nanosheet film-veiled Ag nanoparticles (hBN/Ag substrate). Utilizing the hBN/Ag substrate, the detection limit for crystal violet (CV) under a 532 nm laser is remarkably low at 1.0 × 10 -15 M; adenine, a biomarker, can be detected under UV excitation (a 325 nm laser) with a low limit of 1.0 × 10 -7 M. The hBN/Ag substrate provides abundant electromagnetic (EM) hotspots and multiple charge transfer paths under both 532 nm and 325 nm lasers. This cooperation of EM and chemical enhancement confers ultrasensitive and versatile SERS performance to the substrate. Furthermore, the hBN/Ag substrate demonstrates excellent reproducibility and stability even after 6 months in air, maintaining the SERS intensity of CV at over 86 % of that on the freshly prepared substrate, with a relative standard deviation of 6.57 %. These results indicate that the hBN/Ag substrate can be employed in visible and UV SERS for widespread and practical applications.
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BURNS
·
2024
·
IF 3.2
Ning Liu,Baoxia Xue,Wei Cheng,Yong Liu,Mei Niu,Yongzhen Yang,Shiping Yu,Li Zhang
Dressings play a crucial role in the management of burn wound. In this study, the cotton bandage was modified with the Poly (N-isopropylacrylamide) / graphite oxide/nano silver (PNIPAM/GO-Ag) hydrogel to obtain a novel dressing (PNIPAM/GO-Ag/COT). The healing effect of the PNIPAM/GO-Ag/COT dressing on deep second-degree burn wounds in rats and the changes of related inflammatory factors were explored and analyzed systematically. The deep second-degree burn model was established by the steam scald method in Sprague–Dawley (SD) rats. The granulation tissue, collagen deposition, the expressions of tumor necrosis factor-α (TNF-α), and basic fibroblast growth factor (bFGF) of the wound were evaluated by means of the HE staining, Masson staining, ELISA, and immunohistochemistry methods. The results showed that, compared with the blank group (rats without the dressing treatment), the PNIPAM/GO-Ag/COT dressing reduced the expression of TNF-α by approximately 18 % and promoted the bFGF expression in wound tissue. Compared to the control group (rats with the gauze treatment), the wound healing rate in the PNIPAM/GO-Ag/COT dressing group was 58 % on the 14th day, with an increase of 30 %. These results demonstrated that the PNIPAM/GO-Ag/COT dressing primarily promoted burn wound healing by reducing inflammatory reactions, promoting collagen deposition, and enhancing the expression of bFGF.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Qi Zhang,Zhen Zhang,Bowen Li,Tingfeng Shan,Linzhi Shen,Yaming Zhou,Guanghua Tang,Hongmin Yang
Phase change materials (PCM) have attracted much attention in the field of thermal energy storage because of exceptional heat storage capacity, stable operating temperature, and recyclability . However, organic phase change materials , represented by palmitic acid (PA), are limited by inherent leakage problem, unsatisfactory thermal responsiveness and inefficient photo-thermal storage capacity, which severely hamper the development of PCMs technology. As a means of addressing these challenges, we developed one novel support material with 2D/0D structure for palmitic acid via thermal polymerization , specifically, in which highly dispersed Ag quantum dots (Ag QDs) was firmly anchored on graphitic carbon nitride (g-C 3 N 4 ). PA was further infiltrated into the layered structure of nanoporous g-C 3 N 4 /Ag QDs to successfully synthesize novel shape-stabilized PA/g-C 3 N 4 /Ag QDs composite phase change materials (CPCM). On the one hand, benefiting from the tightly stacked porous structure of g-C 3 N 4 /Ag QDs, PA is effectively encapsulated to avoid leakage problem during the solid-liquid transition with a superior adsorption capacity up to 65 %. On the other hand, the combination of g-C 3 N 4 and Ag QDs in PA/g-C 3 N 4 /Ag QDs CPCM demonstrated a synergistic effect resulting in faster heat transfer capability and more efficient solar energy capture capability compared to pure PA, which is capable of dual utilization of heat and solar energy. The newly developed PA/g-C 3 N 4 /Ag QDs CPCM features a high melting latent heat and an appropriate phase change temperature , which are 128.35 J/g and 61.92 °C, respectively. The corresponding solidification enthalpy and temperature are 121.70 J/g and 60.02 °C. The photo-thermal conversion efficiency of the material is improved to 78.6 %, facilitating a rapid capture and storage of solar energy. Furthermore, through the optimization of the preparation process, Ag QDs are densely anchored on the surface of g-C 3 N 4 , which retains the excellent properties of metallic silver while eliminates the metal agglomeration phenomenon after repeated utilization of CPCMs. PA/g-C 3 N 4 /Ag QDs CPCM is proved to be extremely recyclable and thermally stable after massive thermal cycles. This innovative and operational encapsulation modified method significantly optimizes the practicality of phase change materials. The obtained shape-stabilized PA/g-C 3 N 4 /Ag QDs CPCM is more versatile, and its unique comprehensive properties can provide high-quality materials for photo-thermal storage systems.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Yao Shuaikang,Zhao Jingkun,Shao Guolin,Gao Siyu,Zhai Shangru,Xiao Zuoyi,Zhang Feng
The development of a catalyst with high catalytic activity and selectivity remains a crucial challenge in the field of heterogeneous catalysis. In this work, we demonstrated a versatile procedure for the immobilization of ultrafine and monodispersed metal nanoparticles onto glutaraldehyde-crosslinked polyethyleneimine-modified calcium alginate (GLA-PEI/Ca-SA) beads. The resulting hydrogel beads underwent comprehensive characterization through scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The results revealed that well-dispersed Ag, Cu, and Ni nanoparticles, with a mean size of 3.5, 2.6, and 4.1 nm, respectively, were successfully loaded onto the surface of GLA-PEI/Ca-SA beads with porous fiber network structure. Notably, the Ag/GLA-PEI/Ca-SA exhibited outstanding catalytic activity and stability, achieving over 95% conversion within 7 successive cycles towards the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by NaBH 4 in aqueous solution. Particularly, the Cu/GLA-PEI/Ca-SA beads displayed the highest catalytic activity for the reduction of 4-NP with a kinetic reaction rate constant of 1.56 × 10 −2 s −1 . We expect that this work will provide a novel and effective strategy to design highly efficient catalysts across various catalytic reactions. Graphical Ultrafine and monodispersed Ag nanoparticles within 5 nm on GLA-PEI/Ca-SA beads with high catalytic activity for rapid 4-NP reduction.
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DYES AND PIGMENTS
·
2024
·
IF 4.1
Song Wei,Xiang Luo,Shaofeng Shao,Lei Zhang
Machine learning-assisted synthesis of new materials has been an ongoing hot topic. Luminescent Ag–Zn–In–S quaternary semiconductor quantum dot thin films have great application potential in many fields because of their excellent photoelectric performance. In this study, an environmentally friendly ionic liquid-assisted approach was employed to prepare high-performance Ag–Zn–In–S luminescent thin films, and machine learning methods were applied to screen the optimal preparation conditions. The photoluminescence (PL) performance, crystal structure, and morphology of the thin films were also been studied. The initial data set was obtained by high-throughput experiments. By comparing machine learning algorithms of Xgboost, Random Forest, Bagging, SVM, Extra Tree, and Gradient Boosting, the Random Forest achieved the best accuracy (r = 0.84, R 2 = 0.847) and was selected to predict the optimal preparation conditions of Ag–Zn–In–S quaternary quantum dot thin films. The machine learning predicted results are in great agreement with the subsequent experimental results, which verifies the accuracy and effectiveness of the machine learning model. This study offers a theoretical foundation for preparing optimal inorganic quantum dot luminescent materials using machine learning.
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JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Yin Che,Xuezhen Liu,Lifei Liu,Yali Du,Xia An,Xu Wu
Arranging an ammonia oxidation process after the selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) system is an effective way for ensuring the DeNO x efficiency and controlling the slip ammonia. To improve operability and reduce operating costs in ammonia selective catalytic oxidation (NH 3 -SCO), developing feasible and efficient catalysts becomes meaningful. Herein, focusing on the dilemma of Ag/Al 2 O 3 catalysts in NH 3 -SCO applications, Ag/MgAlO x catalysts with different support different crystalline phase structures (5 %Ag/MgAl-LDO and 5 %Ag/MgAl 2 O 4 ) were innovatively synthesized and systematically evaluated application potential in NH 3 -SCO. Results indicated that the introduction of Mg apparently broadened reaction temperature window and catalytic performance of 5 %Ag/MgAl 2 O 4 was higher than 5 %Ag/MgAl-LDO, while the N 2 selectivity was completely opposite. The combination of series characterization and density functional theory (DFT) calculations revealed that 5 %Ag/MgAl 2 O 4 surface has more Ag 0 species with small particle size, which is favorable for ammonia adsorption and activated dehydrogenation to further promote reaction of NO x species, resulting in a higher NH 3 -SCO activity. In contrast, 5 %Ag/MgAl-LDO readily induces oxidized Ag species and Ag 0 is more inclined to be present in large particle sizes, which is more conducive to dissociation of O 2 to produce reactive O species (O*) leading to the peroxidation of ammonia to nitrate and thus, positively affects the improvement of N 2 selectivity. Model catalyst 5 %Ag/MgAl-650 (mixed-phase) was prepared by controlling the roasting conditions and exhibited excellent catalytic performance in NH 3 -SCO with almost 93 % of NH 3 oxidized at 250 °C (N 2 selectivity up to 71 %). This work could afford theoretical support for the optimization and application of catalysts with high performance at low temperatures in selective catalytic oxidation of slip ammonia.
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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Jianwen Xu,Hao Luo,Jun Ma,Mingdao Zhang,Li Song,Yachao Jin
Li/CF x batteries are used in a wide range of applications thanks to their high theoretical specific energy of up to 2180 mWh/g. However, the high resistivity and unavoidable polarization of the CF x material itself result in low Li-ion migration rates and rate performance. Here, a simple strategy is developed to enhance the rate performances of Li/CF x batteries without sacrificing the specific capacity by in-situ reduction of Ag + ions in ultrafine CF x by UV illumination. The deposited Ag particles provided an efficient pathway for rapid electron transport facilitating Li + diffusion throughout the fabricated electrodes. The optimal CF x @Ag can still achieve a specific energy of discharge of 1645 mWh/g and a specific capacity of 745 mAh/g at a high rate (1 C). This UV deposition technique creates a novel technology. This technique effectively improves the mass transfer efficiency of lithium ions and electrons, pulse resistance, and reduces the internal resistance of Li/CF x batteries.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Hongli Fang,Yuanqing Kang,Shaotang Yuan,Miaomiao Zhang,Zebao Rui
Titanium dioxide (TiO 2 ) is a widely used low-cost and stable photocatalyst, but its wide bandgap and low quantum efficiency usually lead to poor photocatalytic performance. Herein, one-step solid state calcination and reduction method was proposed for simultaneously introducing surface defects and loading Ag nanoparticles (NP) on TiO 2 . The as-obtained black TiO 2-x supported Ag NP (or Ag/TiO 2-x ) holds a narrow bandgap to respond to the full solar spectrum due to the presence of high concentration surface vacancies, enhanced light absorption through the surface plasmon resonance effect of Ag NP, and satisfactory photothermal effects. Moreover, such a one-step solid state synthesis method leads to closely linked interface and enhanced charges transfer between Ag NP and TiO 2-x . Accordingly, Ag/TiO 2-x exhibits robust photothermal synergistic VOCs degradation performance with a toluene degradation rate 6 times higher than the reference Ag/TiO 2 (DP) prepared by the conventional solution method.
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高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2024
·Vol. 39
·期 2
·512-521
·
IF 1.3
Su Zhengnan,Hu Yanru,Meng Lihui,Ouyang Zhiyuan,Li Wenchao,Zhu Fang,Xie Bin,Wu Qingzhi
A novel strategy was developed to prepare the methacrylic gelatin-dopamine (GelMA-DA)/Ag nanoparticles (NPs)/graphene oxide (GO) composite hydrogels with good biocompatibility, mechanical properties, and antibacterial activity. Mussel-inspired DA was utilized to modify the GelMA molecules, which imparts good adhesive performance to the hydrogels. GO, interfacial enhancer, not only improves mechanical properties of the hydrogels, but also provides anchor sites for loading Ag NPs through numerous oxygen-containing functional groups on the surface. The experimental results show that the GelMA/Ag NPs/GO hydrogels have good biocompatibility, and exhibit a swelling rate of 202±16%, the lap shear strength of 147±17 kPa, and compressive modulus of 136± 53 kPa, in the case of the Ag NPs/GO content of 2 mg/mL. Antibacterial activity of the hydrogels against both gram-negative and gram-positive bacteria is dependent on the Ag NPs/GO content derived from the release of Ag + . Furthermore, the GelMA/Ag NPs/GO hydrogels possess good adhesive ability, which is resistant to highly twisted state when stuck on the surface of pigskin. These results demonstrate promising potential of the GelMA-DA/Ag NPs/GO hydrogels as wound dressings for biomedical applications in clinical and emergent treatment.
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高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 3
·1-11
·
IF 2.4
Wang Xiuqing,Yan Ruiyao,Fu Jianyu,He Yan,Zheng Jiahuan,Liu Liu,Zhou Na
The practical application of Cu 2 O in the field of photoelectrocatalytic (PEC) hydrogen production has been limited by its relatively low photoconversion efficiency and electron mobility. Plasmonic metal nanoparticles have been utilized to enhance the charge separation of semiconductors through resonance energy transfer from metal nanoparticles to semiconductors. In this study, Ag nanosphere (Ag NS)@SiO 2 were combined with Cu 2 O to form triple core–shell nanocomposites, aiming to enhance the photoelectrochemical activity of Cu 2 O under visible-light irradiation. The microstructures of the Ag@SiO 2 @Cu 2 O nanocomposites were regulated by controlling the thickness of SiO 2 interlay and Cu 2 O shell in order to optimize the PEC efficiency. It was found that Ag NS@SiO 2 (5 nm)@Cu 2 O (29 nm) NCs exhibited the highest photocurrent intensity, showing 3.3 times, 11.9 times, and 17.8 times higher values than pure Cu 2 O, pure Ag NS, and AgNS@SiO 2 NPs respectively. Furthermore, the photoelectrocatalytic hydrogen production velocity of Ag NS@SiO 2 (5 nm)@Cu 2 O (29 nm) NCs was around 25 mmol·g −1 ·h −1 , which has been improved around 4.2 times compared to pure Cu 2 O. This enhanced performance is attributed to plasmon-induced resonance energy transfer from Ag metal nanoparticles to Cu 2 O semiconductor, which may improve the separation efficiency of electron–hole pairs and lead higher photoelectrocatalytic efficiency. Graphic The Ag NS@SiO 2 was integrated with Cu 2 O to form triple core–shell nanocomposites, aiming to enhance the photoelectrochemical activity of Cu 2 O under visible-light irradiation through plasmon-induced resonance energy transfer from Ag to Cu 2 O. And their photoelectrocatalytic performances were optimized by controlling the thickness of SiO 2 interlay and Cu 2 O shell. Ag NS@SiO 2 (5 nm)@Cu 2 O (29 nm) NCs exhibited superior photocurrent intensity and enhanced photoelectrocatalytic hydrogen production rate compared to pure Cu 2 O.
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POLYMER ENGINEERING AND SCIENCE
·
2018
·Vol. 58
·期 12
·2227-2236
·
IF 1.551
Yang Ren,Shihong Zhang,Xinyi Wan,Yingqing Zhan,Jieming Zhang,Yi He
To obtain high-performance dielectric materials with high dielectric constant and low dielectric loss, novel polymer composites based on poly(arylene ether nitrile) and Ag nanoparticles decorated halloysites nanotube(HNTs) were presented. For this purpose, halloysites nanotubes were modified by bio-inspired polydopamine coating, which acted as both the template and reducing agent for decoration of HNTs by Ag nanoparticles. Moreover, a modified bio-inspired method was developed to realize the surface modification of Ag nanoparticles decorated HNTs hybrid by introducing secondary functional monomer (KH550) to polydopamine system. Therefore, the synergistic effect and good interfacial adhesion contributed to the interesting properties of resulting PEN composites. With addition of 9 wt% Ag nanoparticles decorated HNTs hybrid, the dielectric constant of PEN composite was increased from 3.2 of pure PEN to 10.6 (100 Hz), and low dielectric loss of PEN composite was remained. Furthermore, the tensile strength of PEN composite with 3 wt% of Ag nanoparticles decorated HNTs hybrid increased from 81.07 MPa of pure PEN to 101.3 MPa (increased by 25%). In addition, the glass transition temperature ( T g ) reached 171.9°C with addition of Ag nanoparticles decorated HNTs hybrid, which exhibited the significant enhancement in thermal stability. POLYM. ENG. SCI., 58:2227–2236, 2018. © 2018 Society of Plastics Engineers
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危险品化学品经营许可证（带存储）