APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Jian Wang,Shengyu Wu,Wenjing Zhang,Hongchao Wang,Peiping Zhang,Bo Jin,Cundi Wei,Ruifeng Guo,Shiding Miao
Threats of bacterial infection represent one of the most persistent issues of public health, and efficient bacteria killing materials are to be developed. Taking inspirations from nature, a new class of halloysite (Hal)-based bacteria killing materials (MnO x -Ag/Hal) that were able to self-move in aqueous solution was prepared. The asymmetric halloysite tubes are used as substrates. Silver (Ag) nanoparticles are loaded both in the lumen and on the external surface, and manganese oxide (MnO x ) was distributed on the outside walls. Fuel with low concentration of H 2 O 2 , the catalyst Ag and MnO x would decompose H 2 O 2 into gas bubbles (O 2 ), and the back-thrust bubbles provided forward forces for jet movement, which improved the antibacterial efficiency. The fabricated MnO x -Ag/Hal exhibited powerful self-propelled motion with velocity of 18 ± 4 μm/s achieved at 0.2 wt% H 2 O 2 . The MnO x -Ag/Hal generated Ag + ions and highly reactive oxygen species that could efficiently kill E. coli. By coupling the antibacterial capabilities of H 2 O 2 , Ag and highly reactive oxygen species with powerful self-propulsion, the prepared micromotors were capable of killing 97% of E. coli within 2.0 min, which was threefold as the counterpart of MnO x -Ag/Hal in the absence of H 2 O 2 that cannot move efficiently. The biocompatible micromotors offered an encouraging strategy for rapid bacteria killing in clinical and environment fields.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Guoli Liu,Zhixin Hu,Xiaoping Chen,Weihao Li,Yan Wu,Zuocheng Liu,Lei Miao,Zhu Luo,Jinlong Wang,Yanbing Guo
The contamination of drinking water by microbes is a critical health concern, underscoring the need for safe, reliable, and efficient methods to treat pathogenic microorganisms . While most sterilization materials are available in powder form, this presents safety risks and challenges in recycling. Herein, this study reports the preparation of an innovative copper oxide supported silver monolithic nanoarray mesh with abundant oxygen vacancies (Ag/CuO-V O ) by laser ablation . The instantaneous high temperature caused by laser ablation preserves the material's original structure while generating oxygen vacancies on the CuO surface. The Ag/CuO-V O mesh demonstrated a remarkable ability to inactivate over 99% of Escherichia coli ( E. Coli ) within 20 min. The oxygen vacancies in the Ag/CuO-V O enhance interactions between oxygen species and the Ag/CuO-V O , leading to the accumulation of large amounts of reactive oxygen species (ROS). The generated ROS effectively disrupt both layers of the bacterial cell wall - the peptidoglycan and the phospholipid - as confirmed by Fourier Transform Infrared (FTIR) spectroscopy, culminating in cell death. This research presents a monolithic material capable of inactivating pathogenic microorganisms efficiently, offering a significant advancement in water sterilization technology .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Haoyu Guan,Guoqiang Fang,Xinxin Li,Haoyu Dong,Siqingaowa Han,Xiang Lin,Li Wang
The plasmon coupling properties of assembled metal nanogap structures are highly sensitive to the distance, shape, orientation, and configuration of faceted nanoparticles. However, the orientation control of nanoparticles is usually limited to in-plane configurations. In this paper, Au@Ag nanocubes (NCs) with sharp edges and corners were assembled on a polystyrene (PS) microsphere array as a hierarchical surface-enhanced Raman spectroscopy (SERS) substrate via a facile self-assembly technique. The Au@Ag NC monolayer undergoes an out-of-plane reconstruction and forms V-shaped nanogaps under the modulation of the PS microsphere array curved surface. This unique V-shaped nanogap can generate electromagnetic fields stronger than those of traditional parallel gaps and make it easier for target molecules to diffuse into the nanogaps. The three-dimensional (3D) SERS substrates have a wider spectral response and 20 times higher SERS activity than those of the Au@Ag NC monolayer films on flat substrates. The high sensitivity was demonstrated by the detection limit down to 10–9 M for 4-MBA with a substrate enhancement factor up to 3.1 × 107. Furthermore, the optimized 3D SERS substrate was applied to determine As5+ in water with detection limits as low as 10–8 M assisted by machine learning, indicating that the 3D SERS substrates have promising applications in food safety, environmental monitoring, and biological diagnosis.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 3
·2413-2418
·
IF 2.195
Hu Bo,Yang Fan,Peng Ye,Hang Chunjin,Chen Hongtao,Lee Changwoo,Yang Shihua,Li Mingyu
Ag nanoparticle (NP) paste is considered to be a next-generation thermal interface material. However, its sintered microstructure is at risk of volume shrinkage and mechanical property degradation under harsh environments. In this work, silicon carbide (SiC) NPs were mixed with Ag NP paste to improve the stability and reliability of sintered Ag joints. Robust joints were prepared by a rapid thermal compression method at 275 °C for 20 s. Although the addition of SiC NPs degraded the initial shear strengths of these joints, the SiC-containing joints exhibited excellent mechanical properties and microstructural stability during thermal shock tests from − 50 to 150 °C for up to 1000 cycles. When the added amount of SiC NPs was 2%, the joints achieved the highest shear strength of 87.1 MPa (after 1000 cycles). In addition, the shear strengths of the joints were investigated at 250 °C. The addition of SiC NPs is believed to enhance the reliability of joints at high temperature.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2022
·Vol. 15
·期 8
·1001-1015
·
IF 3.532
Chao Peng Fu,Ke Jin Li,Jia Yong He,Wei Hua Yu,Chun Hui Zhou
The nanostructure of Ag nanoparticles (NPs) plays a critical role in their surface-enhanced Raman scattering (SERS) activity. Despite many efforts to tune the nanostructure of Ag NPs, it remains a great challenge as Ag NPs tend to agglomerate and their nanostructure is difficult to control. Herein, newly-discovered clay-surfactant-Ag+ materials and interfacial processes were developed and used to prepare uniform spherical Ag@synthetic hectorite (Ag@Hct) nanomaterials for ultrasensitive SERS assay. Sodium dodecyl sulfate (SDS), an anionic surfactant, acted as a bridge to conjugate the positively charged edge of Hct NPs and Ag+via electrostatic interaction to form the bridging nanostructure of Hct-SDS-Ag+, which promoted the uniform dispersion of Hct NPs. Following this, Ag+ was reduced to Ag0 by the reductant, and Ag0 grew on the surface of disc-like Hct NPs to form spherical Ag@Hct nanomaterials with an average particle size of ∼24 nm. The prepared Ag@Hct nanomaterials showed an ultrasensitive SERS response to methylene blue (MB) with a detection limit of 10−12 M. The detection limit of MB in sewage was 10−11 M. The prepared Ag@Hct nanomaterials also exhibited great SERS enhancement for malachite green and crystal violet. This work provides a novel and simple approach to prepare Ag@Hct nanomaterials with uniform spheres and adjustable particle size, allowing more sensitive and reproducible detection of MB.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Ziyuan Gao,Huijuan Wu,Zhenxi Liu,Lizhi Liu,Ziqing Zeng,Xiaofeng Yang,Huiyong Wang,Juan Du,Baozhan Zheng,Yong Guo
In comparison with the poor stability, high cost, and difficult preparation of conventional natural enzymes, nanozymes have the obvious advantages of excellent stability, high catalytic activity, multifunctionality, and large-scale preparation. Herein, a series of Fe3O4 NPs-based magnetic composite with dual enzyme-like activities (peroxidase and oxidase) were successfully synthesized by the microwave-assisted method. Among them, the Fe3O4/Ag Au nanocomposite showed the highest peroxidase-like activity due to the synergistic catalytic effect of Ag and Au bimetallic modifications. Enzyme kinetic studies revealed good kinetic parameters of the Fe3O4/Ag Au nanocomposite for peroxidase, and it also exhibited a higher affinity for TMB compared to natural horseradish peroxidase. In addition, a method for effective dye degradation and selective detection of glutathione was constructed based on its peroxidase-like activity. Importantly, the remarkable magnetic separation property and the outstanding stability proved the extensive application prospects of the nanozymes in the remediation of water pollution and some biomarker-specific detection.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Jiaqi Liu,Chunning Chen,Jiaxin Lu,Yalei Wang,Jingtong Zhai,Hongkun Zhao,Nan Lu
Surface-enhanced Raman scattering (SERS) is an important analytical technique. Its detection sensitivity and reproducibility depend on the density and distribution of SERS hotspots. Self-assembly is an efficient method to produce of SERS substrates due to its easy accessibility. However, the assembled defects can hardly be avoided on large area, which could lower the density and uniformity of the hotspots, leading to poor SERS performance. Herein, we report a method to reduce the defects by taking a patterned substrate as template to confine the assembly of Ag nanocubes. The template was prepared based on the combination of photo lithography and self-assembly. Confined by the template, the Ag nanocubes were assembled closely in each dots of the pattern. The limit of detection (LOD) is down to 3.42 × 10 −17 M and the enhanced factor (EF) is up to 3.44 × 10 10 on the prepared substrate for detecting rhodamine 6G (R6G). In addition, the relative standard deviation (RSD) of the different substrates is 8.75 %. The assembled Ag nanocubes exhibits high sensitivity and reproducibility as SERS substrate, which are contributed by the formation of high-density and uniform hotspots. The prepared substrate can be used for detecting trace amounts of melamine in milk with LOD of 2.06 × 10 −7 M and RSD of 6.91 %, so the substrate is applicable for analyzing various analytes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 44
·e2307320120
·
IF 11.1
Yangyang Yu,Ye He,Ping Yan,Shengyao Wang,Fan Dong
The selective photocatalytic conversion of CO2 and H2O to high value-added C2H4 remains a great challenge, mainly attributed to the difficulties in C–C coupling of reaction intermediates and desorption of C2H4* intermediates from the catalyst surface. These two key issues can be simultaneously overcome by alloying Ag with Cu which gives enhanced activity to both reactions. Herein, we developed a facile stepwise photodeposition strategy to load Cu–Ag alloy sub-nanoclusters (ASNCs) on TiO2 for CO2 photoreduction to produce C2H4. The optimized catalyst exhibits a record-high C2H4 formation rate (1110.6 ± 82.5 μmol g−1 h−1) with selectivity of 49.1 ± 1.9%, which is an order-of-magnitude enhancement relative to current work for C2H4 photosynthesis. The in situ FT-IR spectra combined with DFT calculations reveal the synergistic effect of Cu and Ag in Cu–Ag ASNCs, which enable an excellent C–C coupling capability like Ag and promoted C2H4* desorption property like Cu, thus advancing the selective and efficient production of C2H4. The present work provides a deeper understanding on cluster chemistry and C–C coupling mechanism for CO2 reduction on ASNCs and develops a feasible strategy for photoreduction CO2 to C2 fuels or industrial feedstocks.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Cong Wu,Chun Zhang,Xianyi Yan,Qian Liang,Kang Zhao,Yufei Tang
The titanium dioxide drug-loaded nanotube coating on titanium alloy surface was helpful to reduce the risk of infection after implantation in vivo. In this work, Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 (marked as BCZT) with piezoelectric effect and Ag nanoparticles with antibacterial effect were introduced into the TiO 2 nanotube coating, and a piezoelectric and antibacterial BCZT-Ag coating was prepared on titanium surface. The drug release rate in the nanotubes was reduced by the design of the coating structure. The results showed that the Ag nanoparticles were uniformly distributed in the BCZT-Ag coating. The piezoelectric coefficient of BCZT-Ag2.5 coating reached 13.0 pC/N. The release of silver ions in the BCZT-Ag coating showed a significant slow release trend compared with that in the TiO 2 nanotube silver-loaded coating. Interestingly, the antibacterial rate of polarized BCZT-Ag2.5 coating reached 99% even after being immersed in simulated body fluids for 7 days. The BCZT-Ag2.5 coating has no osteoblast toxicity, and osteoblasts can adhere to the BCZT-Ag2.5 coating on titanium surface. The BCZT-Ag2.5 also shows good biological activity in the simulated body fluid immersion experiment. The results will provide a new idea and data support for the application of biological piezoelectric silver loaded coating on titanium surface in orthopedic implants.
✓ 已验证
产品关联
DOI
高影响因子
Nanotechnology Reviews
·
2023
·Vol. 12
·期 1
·
IF 7.4
Wen-Juan Zhang,Ye-Zhi Ding,Ya-Xian Wang,You-Liang Wang,Yu-Long Fei,Meng-Yu Ran
The pollution of silver ion (Ag( i )) has become a serious environmental threat and hazard to ecosystem and human health. Thus, the nanoscale zero valent iron (nZVI)-doped polypyrrole-based carbon nanotube (nZVI/CNT) composites were synthesized by a facile method to remove Ag( i ) from wastewater due to the toxicity and scarcity nature of Ag( i ). In this process, Fe 3+ initiated the self-assembly of polypyrrole tubes in the presence of methyl orange, while it also served as an iron source generated nZVI/CNTs by carbothermal reduction method. The nZVI/CNT composites exhibited a homogeneous tubular structure, and the nZVI formed were uniformly dispersed in the nZVI/CNT composites. The nZVI/CNT composites were used as an adsorbent for the removal of Ag( i ) and showed a higher adsorption capacity compared to nZVI and CNTs, with a maximum adsorption capacity of 522.41 mg g −1 . Ag( i ) was adsorbed on nZVI/CNT composites by ion exchange and chelation, where Ag( i ) was reduced to non-toxic Ag due to the redox reaction among pyrrolic-N, nZVI, and Ag( i ). The adsorption process of Ag( i ) on nZVI/CNT composites was dominated by monolayer adsorption. According to our results, nZVI/CNT composites can be used as economical treatment for wastewater containing Ag( i ).
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Pengyu Zang,Yaqian Du,Chenghao Yu,Dan Yang,Shili Gai,Lili Feng,Shikai Liu,Piaoping Yang,Jun Lin
The newly developed thermoelectric dynamic therapy (TEDT) may not only solve the problem that photothermal therapy (PTT) is limited by the overexpression of heat shock proteins (HSPs) in tumor cells but also improve the killing effect through a dynamic process. Here, we propose photothermal-driven TEDT based on Ag–Ag2S nanoparticles that integrate Ag2S with Ag+ vacancies (VAg) and Ag in a Janus structure. VAg and Ag optimize the band structure and thermoelectric properties of Ag2S, and additional electrons from the introduction of Ag enhance the PTT effect and facilitates the construction of a significant thermoelectric field for electron–hole migration in the reverse direction, thereby markedly enhancing the TEDT effect. Furthermore, the generated VAg can also serve as a hole trap to suppress electron–hole recombination to promote 1O2 production, which inactivates HSPs to produce positive feedback on PTT, leading to better antitumor efficacy. The combined photothermal–thermoelectric therapeutic properties of Ag–Ag2S were verified from both in vivo and in vitro perspectives using ESR, UV–visible spectroscopy, cellular experiments, simulated tumor models, and other experiments.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Xiaoli Liu,Yanyi Fu,Qinglin Sheng,Jianbin Zheng
Herein, a simple electrochemical sensor for dopamine (DA) detection was developed based on Ag@C core-shell structure and Au nanocomposites (Ag@C/Au). The Ag@C core-shell nanoparticles were synthesized by one-pot hydrothermal method , which were supported on Au nanoparticles in situ reduction process. The as-prepared nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV–vis absorption spectra. The electrochemical investigations indicated that Ag@C/Au nanocomposites possessed intriguing properties towards DA. These results could be attributed to the synergistic effect of Ag@C with enhanced substrate accessibility and conductivity, Au nanoparticles with surface of negative charges. Under the optimum experimental conditions, the liner range was 0.5 μM to 27.5 μM, 27.5 μM to 0.2775 mM and 0.2775 mM to 4.278 mM. The detection limit was 0.21 μM (S/N = 3). Furthermore, the electrochemical sensor showed favorable selectivity in the presence of interferents such as ascorbic acid (AA) and uric acid (UA). In general, the work could provide a promising possibility to develop excellent electrochemical sensors for DA detection.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）