JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 25
·13989-14000
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IF 4.22
Wang Yang,Liu Qiang,Zhang Biao,Zhang Haoqian,Jin Yicheng,Zhong Zhaoxin,Ye Feng,Wang Wen
Freeze casting technique has become a promising way to assemble various components into multifunctional nacre-like materials. Surprisingly, although many ceramics materials have been processed by this approach, there are few studies reporting the structure–property-processing relationships of freeze-cast porous B 4 C ceramics. Here we generate bimodally lamellar porous B 4 C scaffolds by freeze casting and describe how processing parameters such as solid concentration and freezing front velocity control the architecture. The porosity, pore morphology and lamella thickness of B 4 C scaffolds can be tailored via altering such two parameters, which makes the scaffolds with excellent mechanical properties suitable as a support for the melt infiltration process. The pore morphology, structural characteristics, compressive mechanical response and fracture mechanism of the scaffolds are explored. Additionally, we have utilized a morphology map to identify the different structures such as lamellar and dendritic, which are formed by varying processing parameters. This study offers the freeze-cast scaffolds with custom-designed structure and mechanical properties for developing bioinspired multifunctional materials represented by B 4 C/Al composites.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 11
·7389-7404
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IF 5.044
Xu Jiangtao,Shang Songmin,Gao Wei,Zeng Ping,Jiang Shouxiang
Although strategies of compositing noble materials and Zeolitic imidazolate frameworks (ZIFs) have been used to enhance the performance of ZIF-based surface-enhanced Raman scattering (SERS) substrates, the enhancement process still remains unclear and the sampling process with powder-form substrates is challenging for practical applications. In this study, a flexible SERS substrate with silver (Ag) nanoparticle decorated ZIF-67 as the active materials and cotton fabric as the supporting framework is developed with a facile method in two steps. The proposed flexible SERS substrate not only can reduce difficulties during the sampling process, but also expands future applications for sampling towards irregular target substances. Meanwhile, the enhancement mechanism has been investigated by using Methylene Blue to probe the molecular interactions. The constructed SERS substrate shows the highest enhancement factor of 6.25 × 10 6 and an excellent detection sensitivity with a limitation of detection (LoD) of 10 –14 M/L. Because of its excellent performance in SERS tracing, the proposed SERS substrate shows exceptional ability in detecting and identifying phenol-soluble modulins and is considered to be a label-free approach that requires no adding markers/tags or antibodies. The proposed substrate expands the potential applications of SERS technology for rapid detection of bacterial toxins during clinical diagnoses and treatment. Graphic abstract Ag decorated ZIF-67 particles are anchored onto cotton fabric to fabricate flexible SERS substrates. The proposed flexible SERS substrate achieves high SERS activity with high enhancement factor, low LoD, good reproducibility and stability. The flexible SERS substrate shows great potential in detection and identification of Phenol-soluble modulin.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 11
·14519-14531
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IF 2.478
Yin Hongxia,Zhao Shiyi,Hao Chuncheng,Lei Qingquan
Space charge accumulation in the insulating layers of high voltage direct current cables is the key factor that leads to their degradation and limits the operation safety. Hence, it is necessary to effectively inhibit space charge injection to these layers. In this study, a new method is proposed to suppress the charge injection to cable insulation layer: a certain amount of Li 4 Ti 5 O 12 nanopowder is doped into the semiconductive screen to enhance the internal conductive network and homogenize the electric field. The influences of Li 4 Ti 5 O 12 particles in the semiconductive composite screen on the positive temperature coefficient effect and space charge injection process are explored. The obtained results reveal that the charge quantity in the insulation layer corresponding to the minimum peak resistivity is reduced by 49.7%, 58.9%, and 46.9% after polarization at a Li 4 Ti 5 O 12 content of 4 wt% and electric field strengths of 10, 20, and 30 kV/mm, respectively.
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CELLULOSE
·
2021
·Vol. 28
·期 9
·5241-5256
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IF 5.044
Zhou Qian,Chen JunJie,Jin Bo,Chu Shijin,Peng Rufang
MOFs are confined to solid supports to overcome their inherent disadvantages of lightweight and submicron size, which pose challenges to the adsorption operation. ZIF-8 nanoparticles can be loaded onto bacterial cellulose (BC) in a simple manner, and subsequently carbonized at 700 °C to obtain a larger specific surface area (expressed as BC@ZIF-8 carbon aerogels (BZCA). SEM indicates that ZIF-8 was successfully self-assembled on bacterial cellulose. Various characterization techniques (SEM, TEM, FT-IR, XRD, BET, and XPS) indicated that BZCA had been successfully prepared, with a large specific surface area (220.45 m 2 /g) and sufficient functional groups (-NH-, -OH, Zn–O, N–O, and C = N-). The relationship of the adsorption of BZCA to UO 2 2+ with both contact time and initial concentration was then studied. Results showed that the adsorption of UO 2 2+ followed a pseudo-second-order kinetic model (R 2 = 0.999). After calculation, the maximum adsorption capacity of BZCA was 535 mg/g, which was comparable to or better than that of other adsorbents. The kinetic analysis disclosed that 70 min was enough for BZCA to reach the adsorption equilibrium. The adsorption mechanism of the prepared adsorbent on UO 2 2+ was studied by FTIR and XPS.
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 12
·3437-3450
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IF 3.186
Bao Er-Peng,Dong Ruichen,Zhang Shuoqing,Li Huan,Zhang Weiguo,Zou Jijun,Xu Qiang
The photocatalysis is a very promising technique to address the serious issues of environmental pollution. Among the common photocatalysts, the graphitic carbon nitride (g-C 3 N 4 ) is widely used for the photodegradation of organic pollutants due to its proper band structure. To further improve the photocatalytic performance of g-C 3 N 4 , a novel composite photocatalyst of Co 3 O 4 /PT-C 3 N 4 has been prepared by using a one-pot calcination method, in which cobalt tetroxide (Co 3 O 4 ) nanoparticles as the cocatalyst are introduced on the surface of rectangular hollow g-C 3 N 4 substrate (PT-Co 3 O 4 ). As a result, the obtained composite photocatalyst (Co3O 4 /PT-C 3 N 4 ) delivers an excellent photodegradation performance for diesel oil under a simulated sunlight, which can improve the separation efficiency of the photo-induced electron–hole pairs. The Co 3 O 4 /PT-C 3 N 4 composite photocatalyst exhibits a high degradation efficiency of 96.27% after 2 h of visible light, which is much higher than that of the PT-C 3 N 4 photocatalyst. Moreover, the composite photocatalyst can still maintain a high photodegradation efficiency after 10 cycles, exhibiting an excellent cyclic stability. The photo-induced carriers generated by the Co 3 O 4 /PT-C 3 N 4 composite photocatalyst follow the Z-scheme heterojunction transfer mechanism. This work gives a fresh idea for the exploration of new high-performance photocatalyst for the treatment of organic environmental pollutants. Graphical Abstract
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 4
·1-13
·
IF 5.833
Yang Qiaoli,Deng Sangsang,Xu Jingjing,Farooq Umer,Yang Taotao,Chen Wei,Zhou Lei,Gao Meiying,Wang Shenqi
Yersinia pseudotuberculosis is an enteric bacterium causing yersiniosis in humans. The existing Yersinia pseudotuberculosis detection methods are time-consuming, requiring a sample pretreatment step, and are unable to discriminate live/dead cells. The current work reports a phage-based electrochemical biosensor for rapid and specific detection of Yersinia pseudotuberculosis . The conductive poly(indole-5-carboxylic acid), reduced graphene oxide, and gold nanoparticles are applied for surface modification of the electrode. They possess ultra-high redox stability and retain 97.7% of current response after performing 50 consecutive cycles of cyclic voltammetry.The specific bacteriophages vB_YepM_ZN18 we isolated from hospital sewage water were immobilized on modified electrodes by Au-NH 2 bond between gold nanoparticles and phages. The biosensor fabricated with nanomaterials and phages were utilized to detect Yersinia pseudotuberculosis successfully with detection range of 5.30 × 10 2 to 1.05 × 10 7 CFU mL −1 , detection limit of 3 CFU mL −1 , and assay time of 35 min. Moreover, the biosensor can specifically detect live Yersinia pseudotuberculosis without responding to phage-non-host bacteria and dead Yersinia pseudotuberculosis cells. These results suggest that the proposed biosensor is a promising tool for the rapid and selective detection of Yersinia pseudotuberculosis in food, water, and clinical samples.
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PubMed
高影响因子
Journal of Coatings Technology and Research
·
2021
·Vol. 18
·期 4
·999-1012
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IF 2.382
Situ Yue,Guo Yanlin,Ji Weiwei,Liu Defei,Wei Dan,Huang Hong
Polyaniline (PANI) encapsulated α-zirconium phosphate (α-ZrP) nanocomposites (PANI/α-ZrP) were prepared by in situ oxidative polymerization and used as anticorrosive filler in epoxy coatings. Water absorption test and electrochemical measurements in 3.5 wt.% NaCl solution were conducted to assess the barrier properties and anticorrosion performances of different coating systems. PANI/α-ZrP composite epoxy coating showed remarkably enhanced corrosion resistance comparing to neat epoxy coating because of “maze effect” from α-ZrP and “passivation effect” from PANI. The α-ZrP nanosheets could be completely encapsulated by PANI with appropriate PANI/α-ZrP mass ratio, and the resulting nanocomposite exhibited optimal corrosion protection properties.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2021
·Vol. 25
·期 4
·1383-1391
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IF 2.647
Yang Hongmei,Hu Peiyu,Tang Jing,Cheng Ying,Wang Fang,Chen Zilin
A simple and sensitive bifunctional electrochemical aptasensor for detection of adenosine and thrombin has been developed using gold nanoparticles–electrochemically reduced graphene oxide (AuNPs-ERGO) composite film-modified electrode. Firstly, the reduced graphene oxide film and AuNPs were sequentially immobilized on glassy carbon electrode (GCE) surface. Secondly, thrombin aptamer was immobilized on the modified electrode. Finally, adenosine aptamer was hybridized with it to serve as a recognition element and methylene blue (MB) as electrochemical signal indicator. In the presence of adenosine or thrombin, the sensor recognized it and a conformational change was induced in aptamer, resulting in decrease of the peak current of MB. The linear relation between concentration of adenosine or thrombin and peak current of MB allowed quantification of them. Thanks to the special electronic characteristic of AuNPs-ERGO composite film, sensitivity of sensor was greatly improved. Under optimal conditions, the proposed aptasensor presented an excellent performance in a linear range of 25 nM to 750 nM for adenosine and 0.5 nM to 10 nM for thrombin. Detection limits were estimated to be 8.3 nM for adenosine and 0.17 nM for thrombin, respectively. Moreover, dual-analyte detection of adenosine and thrombin was achieved without potentially increasing the complexity and cost of the assay.
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JOURNAL OF PHYSIOLOGY AND BIOCHEMISTRY
·
2021
·Vol. 77
·期 2
·283-294
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IF 4.158
Jia Qinghui,Zhang Haihua,Su Yongmei,Liu Xin,Bai Jiangsong,Lang Wuying,Shi Qiumei,Feng Minshan
The ulcerative colitis (UC) is a typical inflammatory bowel disease (IBD) causing great damages, while strictosamide (STR) is a natural alkaloid that possesses strong anti-inflammatory property in infection and inflammation-related diseases. Our study is aimed at evaluating the anti-inflammatory activity of STR in the course of UC. Briefly, male Balb/c mice were treated with 3.5% dextran sulfate sodium (DSS) for 6 consecutive days to establish an acute model of UC, and the administration of gradient concentrations of STR was subsequently performed. Accordingly, colonic pathological alterations including the reduced ratio of colon weight/length, decreased disease activity index (DAI), and attenuated H&E damage were found in UC mice after STR treatment. Based on the analyses of real-time PCR and western blot, downregulation of pro-inflammatory cytokines (TNF-α, IL-1β, and IL-6) was also determined in the colonic tissue of UC mice after the treatment of STR. ELISA and immunohistochemical staining further suggest the relief of inflammation in UC mice with decreased expressions of MPO and iNOS after STR treatment. In addition, STR was also validated to significantly inhibit NF-κB signaling in UC mice by western blot and Electrophoretic Mobility Shift Assay (EMSA). Meanwhile, restricted inflammation was also determined in STR-treated IEC6 and HT-29 cells. The utilization of PDTC, an inhibitor of NF-κB, further demonstrated that STR ameliorated the inflammation by inhibiting the NF-κB signaling in vitro. In summary, our study suggests that STR could be a potential candidate for IBD therapy.
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PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2021
·Vol. 47
·期 12
·5175-5188
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IF 2.914
Du Yu-Bing,Wang Nan,Li Xiang-Nan,Li Juan,Wu Liang-Peng,Peng Quan-Ming,Li Xin-Jun
Construction of high-efficient and low-cost heterostructure photocatalyst is crucial for hydrogen production in solar driven water splitting. Herein, g-C 3 N 4 -modified TiO 2 nanotubes (TNTs) with confined Pt nanoparticles were prepared via a facile two-step process. The results of structure characterizations by XRD, TEM, and XPS reveal that Pt nanoparticles with the average size of 2–3 nm are embedded in the inner cavity of the TiO 2 nanotube, and amorphous g-C 3 N 4 is attached to the outer wall of anatase TNTs. The as-prepared g-C 3 N 4 /TNTs@Pt ternary composite displays an enhanced visible light-induced absorbance capacity and improved charge carrier recombination rate than that of pure TNTs. The photocatalytic performance is evaluated by hydrogen evolution from water splitting by using methanol as sacrifice agent under solar light illumination. Compared with TNTs@Pt and g-C 3 N 4 /Pt photocatalysts, the as-prepared ternary nanocomposite exhibits the highest photocatalytic performance with a H 2 evolution rate of 15.36 mmol h −1 g −1 . A possible mechanism of photocatalytic H 2 production over the ternary g-C 3 N 4 /TNTs@Pt composite is also proposed. This work not only provides a promising low-cost heterostructure candidate for water splitting, but also paves the way to rational design high-performance photocatalysts in solar-to-fuel conversion.
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-11
·
IF 14.919
Wang Jia-Wei,Jiang Long,Huang Hai-Hua,Han Zhiji,Ouyang Gangfeng
The fulfillment of a high quantum efficiency for photocatalytic CO 2 reduction presents a key challenge, which can be overcome by developing strategies for dynamic attachment between photosensitizer and catalyst. In this context, we exploit the use of coordinate bond to connect a pyridine-appended iridium photosensitizer and molecular catalysts for CO 2 reduction, which is systematically demonstrated by 1 H nuclear magnetic resonance titration, theoretical calculations, and spectroscopic measurements. The mechanistic investigations reveal that the coordinative interaction between the photosensitizer and an unmodified cobalt phthalocyanine significantly accelerates the electron transfer and thus realizes a remarkable quantum efficiency of 10.2% ± 0.5% at 450 nm for photocatalytic CO 2 -to-CO conversion with a turn-over number of 391 ± 7 and nearly complete selectivity, over 4 times higher than a comparative system with no additional interaction (2.4%±0.2%). Moreover, the decoration of electron-donating amino groups on cobalt phthalocyanine can optimize the quantum efficiency up to 27.9% ± 0.8% at 425 nm, which is more attributable to the enhanced coordinative interaction rather than the intrinsic activity. The control experiments demonstrate that the dynamic feature of coordinative interaction is important to prevent the coordination occupancy of labile sites, also enabling the wide applicability on diverse non-noble-metal catalysts.
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高影响因子
POLYMER BULLETIN
·
2021
·Vol. 79
·期 9
·7177-7192
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IF 2.87
Pan Zhaoqun,Chen Mianfeng,Zeng Keling,Kang Yingzi
In this paper, a cyclotetrasiloxane modified with epoxy resin was synthesized via hydrosilylation with 1, 3, 5, 7-tetramethylcyclotetrasiloxane (D4H) and 4-vinyl-1-cyclohexane 1, 2-epoxide (VCHO). The structure of tetramethylcyclotetrasiloxane modified with cyclohexane epoxide (D4H–VCHO) was characterized by Fourier transform infrared (FT-IR), 1H nuclear magnetic resonance (1H-NMR) and gel permeation chromatography (GPC). The effects of feeding methods, feeding ratios, catalyst dosages, reaction temperature and reaction time on the products were investigated. After 4-h reaction with 8 ppm catalyst at 90 °C, D4H–VCHO was obtained with an epoxy value of 0.521 and a refractive index of 1.4920. Then, with 4-methylhexahydrophthalic anhydride as a curing agent and tetrabutylammonium bromide as a catalyst, the obtained D4H–VCHO was cured at 90 °C for 1 h and then 120 °C for another hour. The cured products showed high light transmittance, strong thermal stability, suitable hardness and low water absorption. The glass transition temperature of cured materials was 151.6 °C, indicating the improvement of flexibility. In addition, the introduction of epoxy groups greatly enhanced the adhesion of silicone resins to substrates. The results demonstrated that the epoxy-modified silicone materials could be applied as LED packaging materials.
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