NANOTECHNOLOGY
·
2023
·Vol. 34
·期 24
·245710
·
IF 3.5
Ben Niu,Zhenyu Zhai,Jiaona Wang,Congju Li
Znic-based metal–organic framework materials (ZIF-8) show great potential and excellent performance in the fields of sensing and catalysis. However, powdered metal–organic framework makes it easy to lose in the process of application. Herein, we use a simple blending electrostatic spinning method to combine ZIF-8 particles with polyacrylonitrile (PAN) nanofibers. ZIF-8/PAN composite nanofiber membrane. The ZIF-8/PAN nanofiber membrane is characterized by scanning electron microscope (SEM), x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and N2 adsorption–desorption. The results show that the ZIF-8/PAN nanofiber membrane has the characteristic peaks of XRD and FTIR, which are consistent with those of simulated ZIF-8. The specific surface area of ZIF-8/PAN nanofiber membrane increases from 13.5371 to 711.4171 m2 g−1 due to the introduction of ZIF-8 particles. The sensor using the nanofiber membrane as the gas sensing layer shows good response and linear correlation to different concentrations of acetone gas. The minimum detection limit of the sensor for acetone is 51.9 ppm. The blank control shows that the response of the sensor to acetone is mainly due to the introduction of ZIF-8 particles. In addition, the sensor also shows a good cyclic response to acetone.
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高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Jing Liao,Yijin Wang,Bo Hou,Jiamin Zhang,Huihua Huang
Hydrogels based on natural polymers such as agarose usually show low applicability due to their weak mechanical properties. In this work, we developed a dual cross-linked agarose hydrogel by adding different amounts of TEMPO-oxidized nano-chitin (0–0.2 %) to agarose hydrogel matrices and then physically cross-linked under acidic gas-phase coagulation. The prepared hydrogels were characterized by FTIR, XRD, TGA , and SEM. The effects of nano-chitin addition and acidic gas-phase coagulation on the properties of agarose hydrogels, such as gel strength, swelling degree, rheological properties, and methylene blue (MB) adsorption capacity, were also studied. Structural characterizations confirmed that nano-chitin was successfully introduced into agarose hydrogels. The gel strength, storage modulus , and MB adsorption capacity of agarose hydrogels gradually increased with the increasing nano-chitin addition, whereas the swelling degree decreased. After acidic gas-phase coagulation, agarose/nano-chitin nanocomposite hydrogels exhibited improved gel strength and storage modulus, while the swelling degree and MB adsorption capacity were slightly reduced. The combination of oxidized nano-chitin and acidic gas-phase coagulation is expected to be an effective way to improve the properties of natural polymer hydrogels.
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REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Dongdong Yao,Ting Li,Yaping Zheng,Zhilin Zhang
In this study, a novel hybrid nanofluid, composed of a composite core of poly(2-dimethylamino ethyl methacrylate) microgel and silica (PDMAEMA/SiO 2 ) and a shell of polyetheramine (M2070), was fabricated via a combination of inversed emulsion polymerization , biomimetic silicification and grafting onto approach. Firstly, PDMAEMA microgel of ca. 300-nm diameter with good dispersity was prepared in water/cyclohexane system. Subsequently, walnut kernel-structured and solid spherical PDMAEMA/SiO 2 composites were fabricated using swollen and contractive PDMAEMA microgel as catalytic template, respectively. Then 3-(2, 3-epoxypropoxy) propyl trimethoxysilane (KH560) modified M2070 was grafted on PDMAEMA/SiO 2 composites to obtain two kinds of solvent-free PDMAEMA/SiO 2 @M2070 hybrid nanofluids with core@shell structure. Finally, the CO 2 gas adsorption performance of these nanofluids was investigated under different CO 2 pressure (0.5–4.5 MPa) at 25 °C. The results indicated that nanofluid with walnut kernel-structured core showed more excellent CO 2 adsorption capacity than solid spherical one. Moreover, it still displayed good stability over ten adsorption-desorption cycles.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Xiaojiang Liang,Yanren Fei,Qinglong Xie,Yang Liu,Meizhen Lu,Fan Xia,Yong Nie,Jianbing Ji
With the global phaseout of methyl bromide, much more sulfuryl fluoride (SO2F2) is pouring into the atmosphere after fumigation, intensifying the greenhouse effect. Therefore, the reduction of SO2F2 emission is urgently required. In this paper, biobased solvents are proposed to capture SO2F2. Solubilities of SO2F2 in eight biobased solvents at temperatures from 283.15 to 323.15 K and pressures up to 600 kPa are measured. On the basis of thermodynamic consideration, a parametric method is adopted to select potential physical solvents for SO2F2 absorption. Then, a preliminary quantum chemical analysis is conducted to reveal the mechanism of SO2F2 dissolution in biobased solvents. To verify the selective absorption of SO2F2 from fumigation exhaust gas, which is mainly air, the ideal selectivity of SO2F2/N2 and SO2F2/O2 is also probed. Additionally, the recyclability of biobased solvents is examined. Results show that these selected biobased solvents have significantly larger absorption capacities than water. Based on the analysis of solubility data, it is found that bis(2-ethylhexyl) azelate with higher SO2F2 capacity also has smaller Hildebrand solubility parameter and larger SO2F2–solvent interaction energy. Moreover, the interactions between SO2F2 and biobased solvents are revealed to be dispersion interactions. The ideal selectivity of SO2F2/N2 and SO2F2/O2 ranging from 19.98 to 126.93 proves that the selective absorption of SO2F2 is feasible. In addition, the solubility of SO2F2 in bis(2-ethylhexyl) azelate is almost unchanged after six absorption–desorption cycles.
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JOURNAL OF CHROMATOGRAPHY A
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2019
·
IF 3.858
Zi-Meng Wang,Cheng-Xiong Yang,Xiu-Ping Yan
Chiral crystalline sponges (CCSs) are a recent class of chiral porous metal complexes potential in chiral recognition. Here we report the fabrication of polysiloxane OV-1701 incorporated CCS-3S (PSO/CCS-3S) coated capillary column as a novel stationary phase for gas chromatographic separation of diverse racemates. CCS-3S with the chiral ligand of ( S )-mandelic was selected as the model CCS. With the aid of polysiloxane OV-1701, PSO/CCS-3S coated capillary column gave improved resolution, broader enantiomers separation scope and much larger McReynolds constants than CCS-3S coated capillary column. Many racemates that cannot be separated on CCS-3S coated capillary column were well resolved on PSO/CCS-3S coated capillary column. The PSO/CCS-3S coated capillary column also gave wide linear range, low limit of detection, good repeatability and reproducibility, and fine inertness and anti-column bleeding properties for the separation of enantiomers. In addition, the PSO/CCS-3S coated capillary column presented better resolution for the studied racemates than commercial β-cyclodextrin based Cyclosil B (30 m long ×0.32 mm i.d. × 0.25 μm film thickness), β-DEX 225 (30 m long ×0.25 mm i.d. × 0.25 μm film thickness) and amino acid based Chirasil L-Val (25 m long ×0.25 mm i.d. × 0.12 μm film thickness) capillary columns. These results indicate the great potential of PSO/CCS-3S coated capillary column in separation of enantiomers.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 24
·7219-7229
·
IF 6.641
Xiaole Zhang,Dalei Song,Qi Liu,Rongrong Chen,Jindi Hou,Jingyuan Liu,Hongsen Zhang,Jing Yu,Peili Liu,Jun Wang
The reasonable design of semiconductor metal oxides modified by elemental doping and surface functionalization has been proven to be an effective method to improve the gas sensing abilities of chemiresistor-type sensors. In this work, Ni-doped In2O3 nanorods were fabricated via simple oil bath and annealing processes. To further enhance their gas sensing performances, Ag functionalization was carried out by a subsequent chemical reduction process. The experimental results reveal that these composites exhibit excellent formaldehyde sensing performance compared with pure In2O3 nanorods. In particular, 6%-Ag/Ni5.0In presents significantly enhanced gas sensing performance toward 100 ppm formaldehyde gas at a low working temperature (160 °C) with high sensitivity (123.97), fast response speed (1.45 s/58.2 s), and good selectivity and stability. Our research reveals that the improvement in sensing performance toward formaldehyde can be attributed to the large specific surface area, high relative contents of OV and OC components, electronic sensitization and the catalytic effect of Ag. The results provide an effective strategy to achieve excellent gas sensing performance for formaldehyde gas sensors.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Peng Wang,Tao Dong,Changchao Jia,Ping Yang
ZnO flowers with thin sheet and hemisphere shapes were fabricated via thermal decomposition in an organic solvent. Especially, typical hemisphere morphology with exposed (002) crystal face were created for the first time. Because of exposed (002) facet increased, a facet-like heterostructure of ZnO formed to get enhanced sensor performance, especially after loading Au nanoparticles (NPs) using a supersonic chemistry way. Gas sensing tests indicate that the hemisphere Au/ZnO sensor with the best performance and a nice selectivity to acetone. This is ascribed that the unique second-level structure provides more active centers and diffusion channels for acetone molecules. Au NPs increases the thickness of the surface electron depletion layer, which enhanced the sensitivity of the gas sensor.
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CRYSTENGCOMM
·
2019
·Vol. 21
·期 12
·1876-1885
·
IF 3.382
Xiaole Zhang,Dalei Song,Qi Liu,Rongrong Chen,Jingyuan Liu,Hongsen Zhang,Jing Yu,Peili Liu,Jun Wang
Pure and 1–4 mol% cobalt doped indium oxide (Co-doped In2O3) sponge-like microstructures with high specific surface area were fabricated by a simple and environmentally friendly hydrothermal method. The specific surface area and porosity of Co-doped sponge-like In2O3 microstructures can be regulated through the modulation of Co/In molar ratios. The as-prepared sensors based on Co-doped In2O3 exhibit favorable gas sensing properties toward acetone gas; their porous structure can create more adsorption sites for the adsorption of oxygen molecules and the diffusion of the target gas, leading to significant improvement in sensing performance. In particular, 3 mol% Co-doped In2O3 presents the greatest response to acetone vapor at 240 °C, which is about 3.25 times higher than that of pure In2O3. The sensor also exhibits rapid response-recovery time (1.143 s/37.5 s), low detection limit (2.76 at 5 ppm), good reproducibility and high selectivity, making it a promising material for acetone detection.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Rui Gao,Xiaoli Cheng,Shan Gao,Xianfa Zhang,Yingming Xu,Hui Zhao,Lihua Huo
It is very necessary to quickly and selectively detect the abused drugs in real time, because of their bad influence on the central nervous system. So ZnO nanorod bundles were prepared by simple hydrothermal reaction combined with calcination in this paper, which were assembled into thick film gas sensor to detect three analogs of drugs. Such ZnO nanorod bundles gas sensor exhibited not only good gas response and selectivity , but also good reproducibility and stability to the saturated vapors of three kinds of drugs (C 10 H 15 NO, C 9 H 13 NO, C 8 H 9 NO 2 ) at 252 °C. The excellent gas response can be ascribed to its rough surface and the large number of holes formed by nanorod bundles accumulation, which are conducive to diffusion , adsorption and desorption of gas molecules on ZnO nanorods. The reaction mechanism was further analyzed and discussed by XPS.
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Frontiers in Materials
·
2019
·
IF 2.689
Xie Lijuan,Li Zhong,Sun Linchao,Dong Baoxia,Fatima Qawareer,Wang Zhe,Yao Zhengjun,Haidry Azhar Ali
Titanium dioxide is considered as one of the potential candidates for high-temperature gas sensing applications due to its excellent sensitivity and stability. However, its practical use as a gas sensor under elevated conditions is limited on account of its selectivity and insufficient understanding of response conversion from n- to p-type. To this context, the present work is intended to prepare and understand the p-type response of anatase TiO2 toward H2 gas (20–1,000 ppm) at elevated temperature (500°C). Sol-gel route is adopted to facilely synthesize powders containing pure and chromium (1–10 at.%) doped TiO2 nanoparticles, which are then brushed onto substrates with already patterned inter-digitated platinum electrodes. In this work, even, the undoped TiO2 samples showed p-type gas sensing response, which then decreased with Cr doping. However, in comparison to previously reported work, the sensing characteristics of all sensors is improved. For instance, 5 at.% Cr-TiO2 showed high response (147), fast response and recovery (142/123s) time, and good selectivity to hydrogen against monoxide and methane. Despite better response values, the TiO2 based samples show instability and drift in baseline resistance; such issues were not observed for Cr-doped TiO2 samples (≥3 at.%). The powders were further analyzed by XRD, SEM, TEM, and XPS to understand the basic characteristics, p-type response and stability. Further, a plausible sensing mechanism is discussed on basis of results obtained from aforementioned techniques.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 28
·47755
·
IF 2.188
Yixuan Wang,Jiawen Fu,Qingfu Zhang,Liping Lin,Chunhai Yi,Bolun Yang
In this work, ether oxide (EO)-based multilayer composite membranes were prepared via interfacial polymerization (IP) of trimesoyl chloride (TMC) and polyetheramine (PEA) on polydimethylsiloxane precoated polysulfone support membrane. The effects of preparation parameters, such as monomer concentrations, reaction time, and heat-treatment temperature on the membrane performance were investigated. The optimal preparation parameters have been concluded. The results showed the increasing monomers concentration of both PEA and TMC can lead to the decrease of CO 2 permeance and increase of CO 2 /N 2 selectivity. The optimal monomers concentration was found. When monomer concentrations are higher than the optimal values, the CO 2 permeance decreases continually while CO 2 /N 2 selectivity only shows a very limited improvement with the further increase of monomers concentration. The reaction time has similar effects on membrane performance as the monomers concentration. The effect of heat-treatment temperature was also studied. With the increasing heat-treatment temperature, the CO 2 permeance shows a decrease tendency, while the CO 2 /N 2 selectivity shows a maximum at 80 °C. When PEA is 0.013 mol L −1 , TMC is 0.020 mol L −1 , reaction time is 3 min, and heat-treatment temperature is 80 °C, the optimum preparation conditions are achieved with CO 2 permeance of 378.3 gas permeation unit (GPU) and CO 2 /N 2 selectivity of 51.7 at 0.03 MPa. This work may help to design and fabricate gas separation membranes with desired performance. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47755.
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Separation Science Plus
·
2019
·Vol. 2
·期 4
·120-128
·
IF 0
Xiao-Ling Huang,Hai-Hang Lan,Yi-Lun Yan,Gui Chen,Zi-Hao He,Kai Zhang,Song-Liang Cai,Sheng-Run Zheng,Jun Fan,Wei-Guang Zhang
Covalent organic frameworks are a new class of crystalline porous materials that have various potential applications. However, utilization of covalent organic frameworks as new stationary phases for gas chromatography separation has been less explored. In this work, a hydrazone-linked chiral covalent organic framework has been covalently bonded onto the inner surface of fused silica capillary. The fabricated hydrazone-linked covalent organic framework-bound capillary column displays a moderate polarity nature and exhibits relatively high resolution performances for separation of linear alkanes and alcohols, as well as aromatic positional isomers including xylene, nitrotoluene, chloronitrobenzene, benzenediol, and naphthol isomers. The present study reveals that the hydrazone-linked covalent organic framework-bound capillary column is quite promising for the gas chromatography separation of aromatic positional isomers.
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