Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 39
·14549-14559
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IF 8.067
Xiuxia Tang,Xiaoyu Zhao,Jiahong Wen,Jia Liu,Fengyi Zhang,Xiaojie Guo,Kun Zhang,Jian Zhang,Aofang Wang,Renxian Gao,Yaxin Wang,Yongjun Zhang
This paper reports the design and fabrication of an anisotropic Ag nanocavity array, which mainly uses magnetron sputtering and ion beam etching techniques to get the ordered Ag nanocavity array on the polystyrene templates. The nanocavity array can be used as an active substrate for polarized Raman scattering to eliminate polarization-independent background clutters. By controlling the etching angle of the ion beam and the film thickness of the sample, the size of the Ag nanocavity and the position of hot spots can be tuned. The polarized extinction spectra and the polarization Raman test further show the anisotropy of the nanocavity array, which leads to angle-dependent SERS observations. The three-dimensional simulation results of the polarized electric field are consistent with the polarized Raman spectroscopy results, and the fundamental reason for the response of an anisotropic nanostructure to polarized light is found. The angle-dependent SERS excited by polarized light is used to eliminate the background signals, which finally leads to improved SERS signals.
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TALANTA
·
2022
·
IF 6.556
Yanfei Wen,Yuan Yuan,Bing Zhang,Jianying Lin,Zhihuan Zhao,Jing Li,Yan Cheng
A photothermal immunoassay was built for tumor marker detection based on Ag 4 P 2 O 7 @Ag nanocomposites. Ag 4 P 2 O 7 @Ag nanomaterials were synthesized by precipitation-photoreduction reaction, and characterized by transmission electron microscope (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectra (XPS) and X-ray powder diffraction (XRD). Come about PO 4 3− derived from Ag 4 P 2 O 7 @Ag under acidic conditions react with ammonium molybdate in the action of reductant generating molybdenum blue. The photothermal change is due to molybdenum blue solution depending on the concentration of carcinoembryonic antigen (CEA) in immunoassay. Under optimal conditions, there is a linear relation between ΔT and CEA concentration in the range of 1 pg mL −1 –40 ng mL −1 with the detection limit of 0.33 pg mL −1 . Meanwhile, the developed photothermal immunoassay displays preferable selectivity , repeatability, and stability.
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RESEARCH ON CHEMICAL INTERMEDIATES
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2022
·Vol. 48
·期 10
·4163-4182
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IF 3.134
Yang Fanger,Zhang Haowen,Tang Qi,Lu Shihui,Zhang Hongsheng,Zheng Xiaohua
Photocatalysis is considered to be one of the possible routes to solve energy crises at a low cost. Graphitic-C 3 N 4 combined with other semiconductors at the nanoscale has demonstrated a promising potential in photocatalysis application owing to the heterojunction configuration. In this study, Ag/g-C 3 N 4 /CuNb 2 O 6 -4 (mass ratio of CuNb 2 O 6 to g-C 3 N 4 = 1:4) composites were prepared by photo-deposition of Ag particles on the hydrothermally synthesized g-C 3 N 4 /CuNb 2 O 6 -4 composites. The microstructure, morphology, and light absorption property of the photocatalysts were characterized by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–Vis diffuse reflectance spectroscopy. The photocatalytic properties of photocatalysts and active species responsible for the degradation of RhB dye under visible light were investigated. After loading Ag particles on the g-C 3 N 4 /CuNb 2 O 6 -4 composites, the resulting Ag/g-C 3 N 4 /CuNb 2 O 6 -4 composites show a bandgap of ~ 2.31 eV and a significant increase in photocatalytic efficiency. In particular, the photocatalytic activity of 11% Ag/g-C 3 N 4 /CuNb 2 O 6 -4 composite (Ag mass fraction = 11%) is nearly seven times that of orthorhombic CuNb 2 O 6 and 3.8 times that of g-C 3 N 4 /CNO-4 composite. The Z-scheme heterojunction has been successfully formed in the Ag/g-C 3 N 4 /CuNb 2 O 6 -4 composites and it enhances the photocatalytic performance significantly with the best degradation efficiency of 88% after 2 h.
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Scientific Reports
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2022
·Vol. 12
·期 1
·1-10
·
IF 4.996
Ren Tongyan,Feng Chengmin,Dong Jun,Zhu Hong,Wang Bing
Implant-associated infections limit the clinical application of implants therapy; hence, exploiting strategies to prevent biomaterial-associated infections has become important. Therefore, in this study, a series of poly (p-dioxanone) (PPDO)-coated Ag loading TiO 2 nanoparticles (Ag@TiO 2 -PPDO) was synthesized to be applied as bacteriostatic coating materials that could be easily dispersed in organic solvent and coated onto implantable devices via temperate methods such as electrospraying. The lattice parameters of TiO 2 were a = 0.504 nm, b = c = 1.05 nm, alpha = beta = gamma = 90 degree and the size of crystallite was about 13 nm, indicating that part of Ag has been embedded into crystal defects of TiO 2 . Both XRD and TEM determinations indicated the successful grating of PPDO on the surface of Ag@TiO 2 . Among Ag@TiO 2 nanoparticles with various Ag loading quantities, 12% Ag@TiO 2 nanoparticles exhibited relatively higher grafting efficiency and Ag contents on the surface of grafted composites. In addition, 12% Ag@TiO 2 -PPDO exhibited the best bacteriostatic effect in vitro owing to its higher grafted efficiency and relatively short length of PPDO segments. Subsequently, Ag@TiO 2 -PPDO was coated on the surface of a poly lactic-co-glycolic acid (PLGA) electrospun membrane via the electrospraying method. Finally, the in vivo bacteriostatic effect of 12% Ag@TiO 2 -PPDO coating was verified by implanting 12% Ag@TiO 2 -PPDO-coated PLGA membrane into a rat subcutaneously combined with an injection of Staphylococcus aureus at implanting sites.
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POLYMER
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2022
·
IF 4.432
Jinming Li,Heng Li,Chengwei Wu,Wei Zhang
The self-healing ability of articular cartilage is poor, and hydrogel materials are expected to be used for cartilage replacement due to their high-water content and good biocompatibility. Here, the polyvinyl alcohol-acrylamide-agarose multi-network hydrogel was proposed. The hydrogel has a compressive modulus of 1.19 MPa and a compressive strength limit of 8.87 MPa, as well as a tensile modulus of 0.63 MPa and a tensile strength limit of 1.08 MPa. The mechanical properties of hydrogel meet the requirement for cartilage replacement materials. The in vitro cell experiments indicate that the introduction of agarose improves the cell adhesion of the hydrogel, which is expected to be beneficial in the field of biomedicine.
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Journal of Energetic Materials
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2022
·
IF 2.421
Xiaopeng Zhang,Yige Wu,Pengcheng Wang,Qiuhan Lin,Shusen Chen,Shaohua Jin,Yuangang Xu,Ming Lu
As a new structural motif, an interesting 3D energetic metal – framework of silver ions and 3,4-diaminofurazan, [Ag+(daf)NO3−]n, is successfully synthesized and the structure is determined by single-crystal X-ray diffraction. The effects of hydrogen bond, coordination bond, adsorption and filling interactions make this compound have a high density (2.694 g·cm−3 at 293 K). The calculated detonation velocity and the sensitivities are all comparable with trinitrotoluene (TNT). The onset decomposition temperature is equal to hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), state-of-the-art explosive. This framework provides a potential superiority of E-MOFs for energetic materials.
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Chemical Science
·
2022
·Vol. 13
·期 16
·4616-4622
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IF 9.969
Jianxin Zhai,Baowen Zhou,Haihong Wu,Shuaiqiang Jia,Mengen Chu,Shitao Han,Wei Xia,Mingyuan He,Buxing Han
Design of active catalysts for chemical utilization of methane under mild conditions is of great importance, but remains a challenging task. Here, we prepared a Ag/AgCl with SiO2 coating (Ag/AgCl@SiO2) photocatalyst for methane oxidation to carbon monoxide. High carbon monoxide production (2.3 μmol h−1) and high selectivity (73%) were achieved. SiO2 plays a key role in the superior performance by increasing the lifetime of the photogenerated charge carriers. Based on a set of semi in situ infrared spectroscopy, electron paramagnetic resonance, and electronic property characterization studies, it is revealed that CH4 is effectively and selectively oxidized to CO by the in situ formation of singlet 1O2via the key intermediate of COOH*. Further study showed that the Ag/AgCl@SiO2 catalyst could also drive valuable conversion using real sunlight under ambient conditions. As far we know, this is the first work on the application of SiO2 modified Ag/AgCl in the methane oxidation reaction.
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FUEL
·
2022
·
IF 8.035
Lihong Guo,Wenlei Xie,Chunli Gao
The heterogenization of Keggin-structure heteropoly acids (HPAs) has been proposed as a strategy to improve their application in biodiesel production in an attempt to comply the green and clean production demand. Herein, the commercial activated carbon (AC) was firstly modified with different metal ions (Cs + , K + and Ag + ), and then the H 6 PV 3 MoW 8 O 40 acid was incorporated into as-modified AC supports, so as to prepare HPAs-based solid catalysts. By screening tests, the 35%H 6 PV 3 MoW 8 O 40 /AC-Ag hybrid solid catalyst showed highly catalytic performance for transesterification of soybean oil. The best oil conversion of 91.3% was achieved under optimized conditions: methanol/oil molar ratio of 30:1, reaction time of 10 h, reaction temperature of 140 °C and catalyst dosage of 8 wt.%. Characterization results of XRD, IR, ICP and TG indicated that H 6 PV 3 MoW 8 O 40 was highly dispersed on the AC-Ag support as the loading was less than 35%. Proton exchange with Ag may contribute to the highly dispersion of H 6 PV 3 MoW 8 O 40 on the support and thus enhance the interaction of the heteropoly acids with the support, thereof leading to the increased catalytic stability. The as-prepared 35%H 6 PV 3 MoW 8 O 40 /AC-Ag catalyst was easily recycled and had good resistance to free fatty acid (FFA) and water, which were usually included in the low-quality oils. Moreover, as a bifunctional catalyst, the solid acid catalyst could simultaneously catalyze the transesterification of soybean oil and esterification of FFAs, and a probable mechanism of the catalytic process was also proposed. All the features of this novel solid catalyst are more advantageous than the homogenous H 6 PV 3 MoW 8 O 40 catalyst, successfully creating an efficient and sustainable approach of biodiesel production especially from the low-quality oils.
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Advanced Materials Interfaces
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2022
·Vol. 9
·期 11
·2102245
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IF 6.389
Jingxian Sun,Yixin Yuan,Guoqiang Lu,Tanlong Xue,Jun Nie,Yan Lu
Recently, flexible strain sensors have been intensively studied in order to meet the growing demands of detecting multiscale mechanical deformations. However, it remains a big challenge to integrate high stretchability and high sensitivity in a strain sensor simultaneously. In this study, a highly stretchable and sensitive strain sensor is successfully fabricated by constructing ionogel/silver synergistic conductive network. The transmetalation reaction is utilized to transform the copper atoms in the copper/ionogel nanocomposite into more silver atoms with larger radius, which eliminates the interspace among the nanoparticles, and therefore a silver/ionogel nanocomposite with high conductivity is obtained. Owing to the fragility of the conductive network, the obtained nanocomposite possesses high sensitivity. In addition, as the polymer substrate, the conductive ionogel can connect the crack of the silver conductive network during stretching, endowing the nanocomposite with high stretchability. Hence, the obtained strain sensor exhibits a high sensitivity in a wide sensing range and can detect various human activities. Therefore, this strategy can be envisioned as promising strategy for fabricating high-performance strain sensors and other flexible electronics.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Jian-xiang Li,Hong Yang,Rong-hua Gu,Yu-hang Dong,Yong-wei Cai,Qi Zhao,Yao Chen,Mi Huang
Catheter-associated urinary tract infections (CAUTIs) are one of the most common hospital-acquired infections. In this study, a new Fe 3+ -carboxymethylcellulose (CMC)-polyacrylamide (PAAm) - Ag nanoparticles (AgNPs) interpenetrating hydrogel coating with antibacterial properties on the surfaces of latex urinary catheters was prepared with a simple dipping method. The morphology, chemical composition , surface roughness , and contact angles of the coated urinary catheters were characterized by using SEM, EDS, ATR-FTIR, XPS , AFM , and contact angle instruments, respectively. The antibacterial performance of the coated urinary catheters was characterized by the inhibition zone tests. Furthermore, the toxicity profile of the coated urinary catheters was also evaluated in vitro via MTT assay and hemolysis test. The experimental results showed that the Fe 3+ -CMC-PAAm-AgNPs hydrogel-coated urinary catheters had strong antibacterial effects . The concentration of AgNPs after the release of 30 days was still higher than the effective antibacterial concentration of the total Ag (0.1 ppb) and was lower than the toxic concentration of human cells (10 ppm). The inhibition zone tests of the coated urinary catheter against E. coli (ATCC25922) showed that both the CMC-PAAm-AgNPs hydrogel coatings and the Fe 3+ -CMC-PAAm-AgNPs hydrogel coatings had clear inhibition zones in the culture medium. The addition of Fe 3+ exhibited synergistic antibacterial effects with AgNPs. Moreover, the coatings also showed admirable biocompatibility and hemocompatibility. The synergistic antibacterial mechanism was also proposed. The novel Fe 3+ -CMC-PAAm-AgNPs hydrogel coatings for urinary catheters would have great potential in reducing CAUTIs.
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JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 36
·期 24
·5002-5012
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IF 3.089
Zhou Haijun,Jiresse Nguetsa Kuate Loic,Zhang Weirun,Chen Zhengyang,Zhang Yamei,Zhang Jiaoxia
The photodegradation technology can improve the status quo of environmental problems seriously which hindered the development and progress of human society. In this work, the two-dimensional transition metal carbide Ti 3 C 2 was prepared by HF etching of Ti 3 AlC 2 , and subsequently TiO 2 crystals were produced by hydrothermal method to prepare TiO 2 /Ti 3 C 2 composite. The Ag nanoparticles were then doped by photoreduction to form a ternary Ag/TiO 2 /Ti 3 C 2 composite. The effect of photocatalytic degradation of the methyl orange solution by Ag/TiO 2 /Ti 3 C 2 was investigated. The degradation only with Ag/TiO 2 /Ti 3 C 2 is worser than TiO 2 /Ti 3 C 2 , so H 2 O 2 was added to improve the catalytic ability and explore the photocatalytic mechanism. In 420 min, the degradation efficiency of methyl orange (MO) solution reached 71.09% due to the active-free radicals preventing the recombination of electron hole pairs to improve the catalytic performance of photocatalytic materials. Graphical abstract
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Nanomaterials
·
2021
·Vol. 11
·期 12
·3395
·
IF 5.076
Wei Zhang,Yanli Lu,Yang Zang,Jinhui Han,Qingyun Xiong,Jinping Xiong
In this study, a new method for synthesizing Ag-NaYF4:Yb3+/Er3+@ SiO2nanocomposites was introduced. Using a hydrothermal method, the synthesized Yb3+- and Er3+-codoped NaYF4up-conversion luminescent materials and Ag nanoparticles were doped into up-conversion nanomaterials and coated with SiO2up-conversion nanomaterials. This material is known as Ag-UCNPs@SiO2, it improves both the luminous intensity because of the doped Ag nanoparticles and has low cytotoxicity because of the SiO2coating. The morphology of UCNPs was observed using scanning electron microscopy (SEM), and the mapping confirmed the successful doping of Ag nanoparticles. Successful coating of SiO2was confirmed using transmission electron microscopy (TEM). Fluorescence spectra were used to compare changes in luminescence intensity before and after doping Ag nanoparticles. The reason for the increase in luminescence intensity after doping with Ag nanoparticles was simulated using first-principles calculations. The cytotoxicity of Ag-UCNPs@SiO2was tested via the cell counting kit-8 (CCK-8) method, and its imaging ability was characterized using the micro-CT method.Keywords:up-conversion;nanomaterials;CT imaging
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