INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Kunpeng Zhou,Zhengchao Zhang,Jingwen Xue,Jianmeng Shang,Dejun Ding,Weifen Zhang,Zhijun Liu,Fang Yan,Ni Cheng
Bacterial infections significantly slow the wound healing process, thus severely threatening human health. Furthermore, traditional antibiotics may promote the development of multidrug-resistant bacteria. Therefore, developing novel bactericides and therapeutic strategies for bacterial infections is important to enhance wound healing. Herein, a three-in-one bactericidal flower-like nanocomposite was assembled using Ag nanoparticles/phosphotungstic acid-polydopamine nano-flowers (AgNPs/POM-PDA). The nanocomposite exhibited photothermal therapy (PTT) when exposed to NIR light via photothermal conversion by PDA. The resultant photothermal effect accelerated and controlled the Ag + released from AgNPs. The chemodynamic therapy (CDT) was obtained via POM catalytic Fenton-like reaction. The combined PTT/CDT/Ag + treatment achieved excellent synergistic anti-bacterial activity against both gram-negative E. coli and gram-positive S. aureus . A multifunctional wound dressing was then obtained by embedding the AgNPs/POM-PDA flower-like nanocomposite into the chitosan (CS)/gelatin (GE) biocomposite hydrogel. The synergy of AgNPs/POM-PDA nanocomposites and CS/GE hydrogel remarkably accelerated wound healing in vivo due to the excellent biocompatibility, hydroabsorptivity, and breathability of the hydrogel. In this study, a multifunctional agent was developed to synergistically combat bacterial infections and accelerate wound healing.
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PubMed
高影响因子
Nano Research
·
2020
·Vol. 13
·期 3
·646-652
·
IF 8.183
He Caihong,Yu Lingli,Lu Na,Wang Wenjing,Chen Wei,Lu Shaojie,Yang Yun,Ma Dekun,Huang Shaoming
Heterostructured bimetal nanocrystals with a component having localized surface plasmon resonance (LSPR) property are promising photocatalysts for a series of reactions. In this work, kinetic products of Pd-Ag with a screwdriver-like heterostructure have been successfully fabricated via the selective epitaxial growth of Ag on Pd nanowires (NWs). It was confirmed that the deposition rate ( V deposition ) of Ag is much more sensitive to the temperature, compared to the surface diffusion rate ( V diffusion ) which can be effectively reduced by the binding of poly(vinylpyrrolidone) (PVP) molecules. Then the magnitude of V deposition / V diffusion has been well tailored for the formation of a kinetic growth environment. The interactions between the components of the as-prepared Pd-Ag heterostructures resulted in intensified LSPR effects. As a result, they gained better photocatalytic performance toward solvent free aerobic oxidation of toluene than Pd NWs, Ag NWs and the mixture of them. Additionally, the Pd-Ag heterostructured nanocrystals exhibited excellent catalytic stability for recycling. This work not only presents an idea for realizing kinetic growth but also supports that LSPR effect is a good tool for improving the photocatalytic activity.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 22
·19578-19587
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IF 2.324
Liu Chuanmei,Xu Jiangtao,Liu Zhengqin,Ning Xin,Jiang Shouxiang,Miao Dagang
In this study Ti/Ag/Ti tri-layer and Ti–Ag alloy films were deposited on the surfaces of polyethylene terephthalate (PET) fabrics by multi-target magnetron sputtering system to fabricate highly electro-conductive textiles. Before sputtering, the fabric was treated by polyacrylic acid ester (PA) to form a continuous surface on the surface of PET fabric by padding method. The as-fabricated fabrics were characterized by scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectrometer. And the physical properties of the coated fabrics were evaluated by electrical conductivity, contact angle (CA), flexibility and adhesion. At last, a simple electric circuit was made with the as-treated fabric to evaluate the electrical property and explore its application further. The results of the study revealed that pretreatment with PA could form a continuous film on the surface of PET fabric. The PA-coated PET fabric with Ti/Ag/Ti fabric exhibited excellent electrical property whose electrical resistivity was only 5.1 × 10 −7 Ω m, CA of 137°. The PA-coated PET fabric with Ti–Ag alloy film exhibited a rather lower electrical resistivity of 3.4 × 10 −7 Ω m, CA of about 130°. Moreover, the samples retain ideal flexibility and adhesion. Therefore this study can broaden the application area of magnetron sputtering on discontinuous surface to fabricate electrical conductive fabric. And due to the excellent electro-conductivity, this kind of fabric will be a promising material for smart textiles.
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Energy & Environmental Science
·
2017
·Vol. 10
·期 11
·2401-2410
·
IF 29.518
Ya-Fang Qi,Dong-Xing Kou,Wen-Hui Zhou,Zheng-Ji Zhou,Qing-Wen Tian,Yue-Na Meng,Xin-Sheng Liu,Zu-Liang Du,Si-Xin Wu
Although the substitution of Cu by Ag to suppress CuZn defects offers several advantages in overcoming the large open-circuit voltage (Voc) deficit for Cu2ZnSn(S,Se)4 (CZTSSe) solar cells, an excellent performance has not been achieved to date primarily due to the Fermi level pinning at the CdS/absorber interface and large recombination at the absorber/Mo interface. Herein, we developed a composition grading strategy to achieve a V-shaped Ag-graded structure with a higher Ag content on both the back and front surfaces of the (Cu,Ag)2ZnSn(S,Se)4 (CAZTSSe) layer. The key advantages of this Ag-graded structure are as follows: the higher content towards the CdS/absorber interface can create weak n-type donor defects and retard Fermi level pinning, whereas the lower content at the interlayer maintains the conductivity and light absorption; moreover, the other higher content towards Mo back contact can effectively suppress the recombination and improve the utilization of long-wave incident light. By appropriately adjusting the Ag gradient, we demonstrated a significant increase in Voc, and an unexpected conversion efficiency of 11.2% was achieved. This is the highest efficiency achieved to date for Ag-substituted CZTSSe solar cells, and the result supports a new aspect that synthesis of a composition-graded CAZTSSe absorber has great potential for future research.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Yu-fang Fu,Jian Zhu,Xin Li,Guo-jun Weng,Jian-jun Li,Jun-wu Zhao
In this work, we synthesized Au-Ag alloy nano-garlands with multiple petal-like branches and internal cavities in two steps. First, we etched silver nanospheres with HAuCl 4 to obtain Au-Ag alloy nanoshells with different shell layer thicknesses and hollow core sizes. After that, based on different nanoshells, 4-NTP was used as a shape-directing agent, HAuCl 4 and AgNO 3 as precursor raw materials, and AA as a reducing agent for the growth of petals to form Au-Ag bimetallic nano-garlands with multi-branching structure. The regulation of the branching morphology of the nano-garlands could be achieved by changing the amounts of 4-NTP and HAuCl 4 . The SERS activity of the nano-garlands could be further improved by changing the AA concentration, the size of nanoshells, and the Au/Ag ratio of the precursor raw materials. Because the bimetallic nano-garlands have hollow cavities and petal-like branches, there are couplings between the cavities and the branches, between the adjacent branches, and between the metals inside and outside of the cores, which can achieve a good enhancement of SERS. The highest SERS enhancement factor of Au-Ag bimetallic nano-garlands can reach 4.47×10 8 , which can be used as a good candidate for SERS substrate for the trace detection of biomolecules , pesticides, and other substances.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 41
·20513-20522
·
IF 9.931
Yunyun Huang,Aoxiang Xiao,Guanhua Hou,Hongtao Li,Tuan Guo,Bai-Ou Guan
An in situ strategy to understand the photocatalytic performance of Cu2O–Ag@rGO nanocomposites through interfacial photocatalysis on an optical microfiber has been proposed and experimentally demonstrated. The photocatalysts were conjugated on the surface of an optical microfiber immersed in an organic solution, forming an interface consisting of photocatalysts and organic molecules between the silica microfiber and the solution, which was within the evanescent field of the optical microfiber. In the photocatalytic process, the decomposition of organics changed the refractive index (RI) of the interface. The interaction between the evanescent wave and the microfiber interface modulated its optical spectrum. Therefore, the optical microfiber monitored the photocatalytic performance of the photocatalysts in real-time and in situ. The results reveal that the photodegradation efficiency of Cu2O–Ag@rGO was almost twice that of Cu2O, while the degradation rate constant was more than five times larger, because the coupling between the silver nanoparticles and reduced graphene oxide (rGO) enhanced the photocatalytic performance of Cu2O. By taking advantage of its miniature size and mechanical flexibility, the microfiber can directly probe a real matrix to study the local photocatalytic performance. This strategy is suitable for the evaluation of most photocatalysts and might provide a new perspective to assess the photocatalytic performance of the catalysts.
研究领域:
材料科学
·
光学
·
环境科学
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Advanced Science
·
2022
·Vol. 9
·期 20
·2200281
·
IF 17.521
Liwen Hong,Gaoxian Chen,Zhengwei Cai,Hua Liu,Chen Zhang,Fei Wang,Zeyu Xiao,Jie Zhong,Lei Wang,Zhengting Wang,Wenguo Cui
Emerging evidence indicates that a vicious cycle between inflammation and microthrombosis catalyzes the pathogenesis of inflammatory bowel disease (IBD). Over-stimulated inflammation triggers a coagulation cascade and leads to microthrombosis, which further complicates the injury through tissue hypoxia and ischemia. Herein, an injectable protein hydrogel with anti-thrombosis and anti-inflammation competency is developed to impede this cycle, cross-linked by silver ion mediated metal-ligand coordination and electronic interaction with sulfhydryl functionalized bovine serum albumin and heparin, respectively. The ex vivo experiments show that the hydrogel, HEP-Ag-BSA, exhibits excellent self-healing ability, injectability, biocompatibility, and sustained drug release. HEP-Ag-BSA also demonstrates anti-coagulation and anti-inflammation abilities via coagulation analysis and lipopolysaccharide stimulation assay. The in vivo imaging confirms the longer retention time of HEP-Ag-BSA at inflammatory sites than in normal mucosa owing to electrostatic interactions. The in vivo study applying a mouse model with colitis also reveals that HEP-Ag-BSA can robustly inhibit inflammatory microthrombosis with reduced bleeding risk. This versatile protein hydrogel platform can definitively hinder the “inflammation and microthrombosis” cycle, providing a novel integrated approach against IBD.
研究领域:
药理学
·
生物医学工程
·
胃肠病学
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Yibo Zhang,Zhihua Li,Liangjun Gong,Xuyu Wang,Peng Hu,Jun Liu
With the advantages of the multiple oxidation states and highly open crystal structures, vanadium-based composites have been considered as the promising cathode materials for aqueous zinc-ion batteries (ZIBs). However, the inherent inferior electrical conductivity, low specific surface area, and sluggish Zn 2+ diffusion kinetics of the traditional vanadium-based oxides have greatly impeded their development. Herein, a novel hierarchical porous spindle-shaped Ag-V 2 O 5 with unique heterostructures was rationally designed via a simple MOF-assisted synthetic method and applied as stable cathode for aqueous ZIBs. The high specific surface area and hierarchically porous superstructures endowed Ag-V 2 O 5 with sufficient electrochemical active sites and shortened the diffusion pathways of Zn 2+ , which was beneficial to accelerate the reversible transport of Zn 2+ and deliver a high specific capacity (426 mA h g −1 at 0.1 A g −1 and 96.5% capacity retention after 100 cycles). Meanwhile, the self-built-in electric fields at the heterointerface of Ag-V 2 O 5 electrode could strengthen the synergistic coupling interaction between Ag and V 2 O 5 , which can effectively enhance the electric conductivity and maintain the structural integrity, resulting in superb rate capability (326.1 mA h g −1 at 5.0 A g −1 ) and remarkable cycling stability (89.7% capacity retention after 2000 cycles at 5.0 A g −1 ). Moreover, the reversible Zn 2+ storage mechanism was further investigated and elucidated by kinetics analysis and DFT calculations.
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ENVIRONMENTAL ENGINEERING SCIENCE
·
2022
·Vol. 39
·期 7
·628-638
·
IF 2.172
Qian Rao,Dandan Lv,Hui-qiang Li,Qin Long
The increasing of 1-hydroxy-1,1-diphosphonoethane (HEDP) in aquatic environments poses potential harm to the environment. Herein, the materials that silver nanoparticles/nanowires (Ag NPs/Ag NWs) and Fe3O4-decorated CoAl-layered double hydroxides (LDHs-Ag NPs@Fe3O4 and LDHs-Ag NWs@Fe3O4) were synthesized and applied to the degradation of HEDP in three-dimensional electro-Fenton system. Addition of Ag-doped LDHs@Fe3O4 particles greatly increased the HEDP removal rate compared with the addition of LDHs@Fe3O4 particles. The HEDP degradation rates using LDHs-Ag NPs@Fe3O4 and LDHs-Ag NWs@Fe3O4 particles were 73.34% and 79.64%. Furthermore, based on the characterization of synthesized particles, generation of free radical and H2O2, a possible mechanism of improved oxidation performance by the LDHs-Ag NWs@Fe3O4 particles was elucidated. The LDHs-Ag NWs@Fe3O4 particles possessed excellent stability and reusability, as evidenced by the stable degradation activity of 70.53% for HEDP degradation after four successive runs.
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Chemosensors
·
2024
·Vol. 12
·期 7
·137
·
IF 3.7
Zhixiong Lao,Mingmin Zhong,Yin Liang,Jianrong Tan,Xiaoyan Liang,Wucheng Xie,Yong Liang,Jun Wang
Sulfide organics and phenols are ubiquitous in freshwater lakes all over the world. As two taste and odor (T and O) compounds, they are harmful to the environment and human body. The existing detection methods for T and O compounds mainly include sensory analysis and gas-phase mass spectrometry, which are cumbersome and time-consuming. Herein, a method for the simultaneous and rapid detection of two T and O compounds (methyl sulfide and 2,4-di-tert-butylphenol) based on surface-enhanced Raman spectroscopy (SERS) is firstly developed. The SERS substrate was prepared by coating Ag nanoparticles (Ag NPs), layered double hydroxide (LDH), and graphene oxide (GO) on the surface of an Ag-coated Au nanoparticle (Au@Ag NP) substrate. Under optimal conditions, this SERS substrate possessed low detection limits of 1.53 ppm for methyl sulfide and 0.39 ppm for 2,4-di-tert-butylphenol. In addition, it took only 20 min to complete the detection using this method, without complex sample pretreatment. Furthermore, it was successfully applied to simultaneously detect methyl sulfide and 2,4-di-tert-butylphenol in actual water samples and had good application prospects for the rapid detection of T and O compounds in water.
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Sustainable Chemistry and Pharmacy
·
2023
·
IF 6
Dong Liang,Xiaoyu Zhang,Yanle Li,Yumiao Zhou,Mengyu Ren,Xiaoyue Zhang,Yongxiang Li,Na Zhu
An energy-saving and friendly process was performed on the Ag/g-C 3 N 4 photocatalyst to achieve the halo-nitro-phenol intermediates with the ipso -nitration of bromophenols and nitrite. As detected by SEM , TEM and XRD , Ag nanoparticles are proved to be located on the surface of g-C 3 N 4 and lead to the improvement of photocatalytic ability by UV–vis, PL spectra and photoelectronic analysis. The substituents of bromophenols could be immediately related to their regioselective conversion. The fluoro-, chloro-, and bromo-substituted bromophenols revealed the higher nucleophilic potential than the alkyl- and alkoxyl-substituted ones. From the inhibition experiment and EPR analysis, the photo-generated superoxide and active holes played crucial roles in photocatalytic nitration through the peroxynitrite way into ·NO 2 radicals. Finally, the electrostatic potentials of all bromophenols were calculated on Gaussian09 W software to explain the distribution of photo-driven nitration products.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaodong He,Kasi Gopinath,Gnanasekar Sathishkumar,Lingli Guo,Kai Zhang,Zhisong Lu,Changming Li,En-Tang Kang,Liqun Xu
The marked increase in bacterial colonization of medical devices and multiple drug resistance to traditional antibiotics underline the pressing need for developing novel antibacterial surface coatings. In the present investigation, natural polyphenol tannic acid (TA)-capped silver nanoparticles (TA–Ag NPs) were synthesized via an environmentally friendly and sustainable one-step redox reaction under UV irradiation with a simultaneous and uniform deposition on polydimethylsiloxane (PDMS) and other substrate surfaces. In the synthesis process, the dihydroxyphenyl and trihydroxyphenyl groups of TA actively participate in Ag+ reduction, forming co-ordination linkages with Ag NPs and bestowing the deposition on the PDMS surface. The physico-chemical features of TA–Ag NPs were characterized in detail. Microscopic examination, surface elemental analysis, and wettability measurements clearly reveal the decoration of TA–Ag NPs on the substrate surfaces. The modified PDMS surfaces can kill the adhered bacteria or resist the bacterial adhesion, and no live bacteria can be found on their surfaces. Most importantly, the modified PDMS surfaces exhibit predominant antibacterial effects both in vitro in the catheter bridge model and in vivo in a rat subcutaneous infection model. On the other hand, the functionalized surfaces exhibit only a negligible level of cytotoxicity against L929 mouse fibroblasts with no side effects on the major organs of Sprague–Dawley rats after implantation, indicating their biocompatibility for potential biomedical applications.
研究领域:
生物医学工程
·
材料科学
·
微生物学
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