Journal of Materials Chemistry A
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2019
·Vol. 7
·期 38
·21874-21883
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IF 10.733
Yidong Zou,Shibo Xi,Tao Bo,Xinran Zhou,Junhao Ma,Xuanyu Yang,Caozheng Diao,Yonghui Deng
In this study, a versatile multicomponent co-assembly strategy is developed to rationally construct ordered mesoporous amorphous Al2O3/crystalline WO3 heterophase materials (denoted as mAl2O3/WO3). These materials exhibit excellent performance as electrocatalysts in hydrogen evolution reaction (HER) at high Al2O3 contents and as gas sensors in acetone detection at low Al2O3 contents. X-ray absorption fine structure spectroscopy reveals an unexpected local phase transition of the framework from γ-WO3 to metastable ε-WO3 and lattice distortion, which accounts for their application performances. Compared with commercial WO3 powders and mesoporous WO3, the mAl2O3/WO3 hybrid materials exhibit a high cathodic current density of 100 mA cm−2 at an overpotential of −230 mV and a low Tafel slope (52 mV dec−1), close to that of expensive commercial 20% Pt/C (−219 mV and 48 mV dec−1), and they also possess high alkali-stability for even 10 000 cyclic voltammetric sweeps. Thanks to the synergic effect between the catalytic ability of Al2O3 and the strong interfacial interaction of WO3 toward acetone molecules (a typical biomarker for diabetes), the mAl2O3/WO3 nanocomposites with low contents of Al2O3 (<2 wt%) exhibit superior sensing performance toward acetone with excellent selectivity and higher responses even at low concentrations as compared with mesoporous WO3. The concept about designed synthesis of such mesoporous amorphous/crystalline nanocomposites with dual functions at different content ratios holds great promise in development of novel advanced functional materials.
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ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Xingyu Xiao,Xinran Zhou,Junhao Ma,Yongheng Zhu,Xiaowei Cheng,Wei Luo,Yonghui Deng
Semiconducting metal oxides have attracted increasing attention in various fields due to their intrinsic properties. In this study, a facile solvent evaporation-induced multicomponent co-assembly approach coupled with a carbon-supported crystallization strategy is employed to controllably synthesize crystalline mesoporous nickel oxide-doped tungsten oxides in an acidic THF/H2O solution with poly(ethylene oxide)-b-polystyrene diblock copolymers (PEO-b-PS) as the structure-directing agent, tungsten(VI) chlorides as WO3 precursors, and Ni(AcAc)2 as the NiO precursor. The obtained materials possess a face-centered cubic mesoporous structure, large pore size (∼30 nm), high surface area (30–50 m2 g–1), large pore volume (0.15–0.19 cm3 g–1), and ultralarge pore windows (12–16 nm) connecting adjacent mesopores, and the mesoporous WO3 framework was decorated by ultrafine NiO nanocrystals. Due to their well-connected porous structure and high surface areas with rich WO3–NiO interfaces, the composite materials exhibit superior gas sensing performance with an ultrafast response (∼4 s), high sensitivity (Ra/Rg = 58 ± 5.1), and selectivity to 50 ppm H2S at a relatively low working temperature (250 °C). The chemical mechanism study reveals complicated surface reactions of WO3/NiO-based gas sensors, and SO2, WS2, and NiS intermediates were found to be generated during the gas sensing process.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Wenwen Zeng,Yingzhi Liu,Jun Mei,Changyu Tang,Kun Luo,Shaomin Li,Haoran Zhan,Zhoukun He
Considering the high harmfulness of NO 2 to the environment and human healthy, it is pressing to develop NO 2 sensors with high sensitivity and selectivity. In this work, we successfully fabricated a novel hierarchical SnO 2 –Sn 3 O 4 n–n heterostructure through the solvothermal method and subsequent annealing. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM) characterization of the material confirmed the hierarchical microsphere structure and the formation of SnO 2 –Sn 3 O 4 n–n heterojunction. The gas sensing experiment demonstrated that the sample annealed at 600 °C exhibited excellent NO 2 sensing performances at 150 °C. Its sensitivities to 5 and 10 ppm NO 2 were as high as 48 and 43.6 ppm −1 respectively, and its limit of detection was lower than 20 ppb. Additionally, it possessed excellent selectivity to NO 2 as well as good repeatability and stability. With further exploration of the sensing mechanism of hierarchical SnO 2 –Sn 3 O 4 n–n heterostructure, we proposed that the unique microstructure with a large specific surface area and the formation of n–n-type heterojunctions contribute to the excellent NO 2 sensing performance.
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JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 18
·12704-12717
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IF 2.993
Huang Chongxing,Zhang Baodong,Wang Shuangfei,Zhang Linyun,Wang Jian,Huang Xingqiang,Zhao Yuan,Huang Lijie
In this study, a novel chlorine dioxide (ClO 2 ) microcapsule with a performance of moisture-triggered release was fabricated followed by the mixing with polylactic acid (PLA) for the preparation of an antibacterial packaging film. ClO 2 microcapsules were first prepared by encapsulating stable ClO 2 solution (NaClO 2 as the main component) in a PLA shell, and the resulting microcapsules together with tartaric acid were applied as antibacterial components for antimicrobial PLA film using solvent casting method. The impact of ClO 2 microcapsules on the antimicrobial effectiveness, oxygen and water vapor barrier properties, mechanical behavior, and thermal stability of PLA films was investigated. The results showed that the addition of ClO 2 microcapsules at a concentration of 20% imparted PLA films excellent antimicrobial properties with a growth inhibition of Escherichia coli and Staphylococcus aureus by 4.95 log CFU/mL and the antibacterial rate was 99%. Furthermore, the tensile strength of the films with ClO 2 microcapsules at a concentration of 20% was 21.20 MPa, which was 19% higher than that of the PLA film without microcapsules. The oxygen and water vapor transmission rates reached 2800 cm 3 m −2 24 h −1 and 20.00 g m −2 24 h −1 , respectively, and the barrier properties were improved by 20 and 36.14%. Thermogravimetric analysis showed that the generated film was stable before 193 °C. Scanning electron microscopy analysis confirmed a good compatibility between the ClO 2 microcapsules and the PLA matrix, and the emerged voids indicated the generation of ClO 2 and its release from the antimicrobial film. An obvious sustained release of ClO 2 from the antimicrobial film completed until 240 h. The release behavior fitted the logistic model, and the release mechanism followed the S model. This study may provide a feasible approach for the development of food packaging materials with efficient antibacterial activity and sustained-release performance.
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CATALYSIS COMMUNICATIONS
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2018
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IF 3.463
Kun Liu,Tao Qin,Yongbin Sun,Chao Hou,Xiaoqun Cao,Shoujun Jiang
Ag 2 Mn 5 /SiC catalyst is simply obtained by in-situ reaction-induced of their corresponding nitrate compounds onto SiC support, which exhibits excellent catalytic activity and stability in the gas phase oxidation of alcohols (94% conversion of benzyl alcohol and 98% selectivity of benzaldehyde). The catalytic activity could maintain at least 300 h after four regenerations due to the formation of highly active Ag 0 -Mn 3 O 4 species. XRD and XPS indicate that active Ag 0 -Mn 3 O 4 species is formed from Ag 2 O and MnO 2 in the reaction conditions. The synergistic effect between 34 nm Ag nanoparticles and 5.5 nm Mn 3 O 4 nanoparticles in alcohol oxidation reaction is prominent, which is testified by HRTEM and three-step experiment.
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BIOMATERIALS
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2018
·
IF 8.806
Shuang-Shuang Wan,Jin-Yue Zeng,Han Cheng,Xian-Zheng Zhang
This study reports a tumor-specific ROS-responsive nanoplatform capable of the combination of nitric oxide (NO)-based gas therapy and sensitized photodynamic therapy (PDT). The nanoplatform is constructed on porous coordination network (PCN), which contains NO donor L-Arg and is concurrently coated with cancer cell membrane ( [email protected] @Mem). Under near infrared light (NIR) irradiation, [email protected] @Mem produces plenty of reactive oxygen species (ROS) directly for PDT therapy, while a part of ROS take the role of oxidative to converse L-Arg into NO for combined gas therapy. The results indicate that the transformation of ROS to NO can enhance PDT efficacy in hypoxic tumors owing to the ability of NO in freely diffusing into deep hypoxic tumor site. Moreover, homologous targeting function originated from the coating of cancer cells membrane further improves the tumor treatment effect owing to the biotargeting toward homologous tumors. This [email protected] @Mem nanoplatform provides a new therapy paradigm of overcoming the hypoxia barrier of tumor therapy, and holds great potential for the treatment of tumor and NO-related diseases.
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BIOSENSORS & BIOELECTRONICS
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2018
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IF 8.173
Jing Lei,Lu Shi,Baoxin Li,Chaoyong James Yang,Yan Jin
It is of the significant importance to achieve facile and on-site detection of heavy metal ions due to the serious harm to environment and human health. Herein, a facile and portable strategy was developed for detection of Hg 2+ via portable pressure meter. Biotinylated DNA1 was conjugated on the surface of streptavidin-coated magnetic beads (MBs) to form MBs-DNA1 complex. In the presence of Hg 2+ , MBs-DNA1 can hybridize with platinum nanoparticles (PtNPs)-functionalized DNA2 (DNA2-PtNPs) via T-Hg 2+ -T binding. Then, PtNPs effectively catalyzed the decomposition of H 2 O 2 to generate oxygen, leading to an increase in pressure of sealed well of 96-well plate. The gas pressure was linearly related with the concentration of Hg 2+ in the range between 10 pM and 100 nM with a detection limit of 2.79 pM, which is more sensitive than most of the previous reports. The specific T-Hg 2+ -T binding made it easy to selectively detect Hg 2+ even when other metal ions co-existed with Hg 2+ . Therefore, it offers a cost-effective, rapid, facile and portable way to detect Hg 2+ by combining gas-generation reaction with T-Hg 2+ -T binding, which holds great potential for detecting Hg 2+ in water sample.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
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IF 2.829
Yongfei Li,Yanling Wang,Qian Wang,Longhao Tang,Lin Yuan,Gangxiao Wang,Ren Zhang
Wettability alteration of condensate gas reservoirs is very important for improving the productivity of condensate wells. In this work, a novel gas-wetting alteration agent was synthesized by emulsion polymerization . The synthesis process conditions were optimized by the response surface methodology based on the yield of the product. Wettability alteration effect of the polymer was evaluated by the contact angle method and the Owens two-liquid method. Experimental data showed that the effect of temperature on yield is significantly greater than the other two factors. The most preferred synthesis parameters were as follows: a reaction temperature of 80 °C, a molar ratio of acrylic acid to perfluorooctylethyl acrylate of 2.5:1 and 0.06 g of potassium persulfate. Under such optimal specifications, the test yield (84.36%) was almost close to the predicted yield (83.66%). Furthermore, the contact angle of water and n-hexadecane on the core surface increased from 34° and 0° to 126° and 102° after treated by 1.5 wt.% polymer solution . The surface free energy reduced from 73 mN/m to 8.2 mN/m at equal mass fractions. These values were verified by spontaneous imbibition . The results proved that the core has been rendered hydrophobic and oleophobic properties after being treated with the synthesized gas-wetting alteration agent.
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ACS Applied Materials & Interfaces
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2014
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IF 5.9
Er-Xia Chen,Hong-Ru Fu,Rui Lin,Yan-Xi Tan,Jian Zhang
A cobalt imidazolate (im) framework material [Co(im)2]n was employed to use as a trimethylamine (TMA) gas sensor and the [Co(im)2]n sensor can be easily fabricated by using Ag–Pd interdigitated electrodes. Gas sensing measurement indicated that the [Co(im)2]n sensor shows excellent selectivity, high gas response and a low detection limit level of 2 ppm to TMA at 75 °C. The good selectivity and high response to TMA of the sensor based on [Co(im)2]n may be attributed to the weak interaction between the TMA molecules and the [Co(im)2]n framework. That may provide an ideal candidate for detecting freshness of fish and seafood.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2014
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IF 5.481
Yi Zhao,Yanmei Shen,Guoyi Ma,Rongjie Hao
CO2 separation by molecularly imprinted adsorbent from coal-fired flue gas after desulfurization system has been studied. The adsorbent was synthesized by molecular imprinted technique, using ethanedioic acid, acrylamide, and ethylene glycol dimethacrylate as the template, functional monomer, and cross-linker, respectively. According to the conditions of coal-fired flue gas, the influencing factors, including adsorption temperature, desorption temperature, gas flow rate, and concentrations of CO2, H2O, O2, SO2, and NO, were studied by fixed bed breakthrough experiments. The experimental conditions were optimized to gain the best adsorption performance and reduce unnecessary energy consumption in future practical use. The optimized adsorption temperature, desorption temperature, concentrations of CO2, and gas flow rate are 60 °C, 80 °C, 13%, and 170 mL/min, respectively, which correspond to conditions of practical flue gases to the most extent. The CO2 adsorption performance was nearly unaffected by H2O, O2, and NO in the flue gas, and was promoted by SO2 within the emission limit stipulated in the Chinese emission standards of air pollutants for a thermal power plant. The maximum CO2 adsorption capacity, 0.57 mmol/g, was obtained under the optimized experimental conditions, and the SO2 concentration was 150 mg/m3. The influence mechanisms of H2O, O2, SO2, and NO on CO2 adsorption capacity were investigated by infrared spectroscopic analysis.
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Nature Nanotechnology
·
2015
·Vol. 10
·期 7
·608-613
·
IF 34.048
Li Likai,Ye Guo Jun,Tran Vy,Fei Ruixiang,Chen Guorui,Wang Huichao,Wang Jian,Watanabe Kenji,Taniguchi Takashi,Yang Li,Chen Xian Hui,Zhang Yuanbo
For decades, two-dimensional electron gases (2DEG) have allowed important experimental discoveries1,2 and conceptual developments in condensed-matter physics3. When combined with the unique electronic properties of two-dimensional crystals, they allow rich physical phenomena to be probed at the quantum level4,5. Here, we create a 2DEG in black phosphorus—a recently added member of the two-dimensional atomic crystal family6,7,8—using a gate electric field. The black phosphorus film hosting the 2DEG is placed on a hexagonal boron nitride substrate. The resulting high carrier mobility in the 2DEG allows the observation of quantum oscillations. The temperature and magnetic field dependence of these oscillations yields crucial information about the system, such as cyclotron mass and lifetime of its charge carriers. Our results, coupled with the fact that black phosphorus possesses anisotropic energy bands with a tunable, direct bandgap6,7,8,9,10,11,12,13,14,15, distinguish black phosphorus 2DEG as a system with unique electronic and optoelectronic properties.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2015
·
IF 2.729
Meiling Zhang,Congcong Wen,Yuan Zhang,Fa Sun,Shuanghu Wang,Jianshe Ma,Kezhi Lin,Xianqin Wang,Guanyang Lin,Lufeng Hu
This study aims to evaluate the effect of ketamine on rats by examining the differences in serum metabolites between ketamine abuse group (Ket-group) and control group (Con-group). Compared to the Con-group, the level of phosphate, propanoic acid, ribitol and d -fructose of the Ket-group increased after continuous intraperitoneal administration of ketamine for 7 days, while the level of alanine, glycine, butanoic acid, valine, l -serine, l -proline, mannonic acid, octadecanoic acid and cholesterol decreased. After 14 days’ administration, the level of alanine, butanoic acid, valine, l -leucine, phosphate, l -serine, l -threonine, propanetricarboxylic acid, hexadecanoic acid and oleic acid of the ketamine group increased while the level of mannonic acid, octadecanoic acid and cholesterol decreased. After stopping ketamine administration for 2 days, the level of butanoic acid, phosphate, aminomalonic acid, gluconic acid, hexadecanoic acid, oleic acid and arachidonic acid of Ket-group increased, while the level of glycine, l -lysine and cholesterol decreased. This study can provide invaluable information for the metabolites changes due to ketamine abuse.
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