JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 20
·
IF 1.768
Lili Zhao,Haixiang Sun,Namhoon Kim,Joonghee Lee,Ying Kong,Peng Li
Different types of ultrathin multilayer composite membranes adsorbed on polyethylene terephthalate (PET) substrates are fabricated by the layer-by-layer (LBL) self-assembly technique. The hydrogen gas barrier performances of these membranes are measured using a pressure permeation instrument. Polyethylenimines/graphene oxide (PEI/GO) are chosen as the optimal system; the multilayer film reduces the hydrogen transmission rate of the uncoated PET film from 1357 to 24 cm 3 /(m 2 24 h 0.1 MPa). The membrane assembly process for the PEI/GO system is analyzed with UV–Visible spectroscopy, and the flat morphology of the ultrathin film is observed by scanning electron and atomic force microscopies. Moreover, in order to fully characterize the PEI/GO multilayer film system, we investigate the effects of multiple variables on the hydrogen resistance performance. These include the molecular weight of PEI, concentrations of PEI and GO, number of bilayers, soaking time, and drying methods. The film thickness is found to increase linearly during the LBL assembly process. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41973.
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DOI
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Jianping Chen,Limin He,Xiaoming Luo,Chunying Zhang
Foaming tendency of crude oil is diverse due to the variance in crude oil components. Crude oil viscosity , asphaltene , and resin contents have been studied in general, but the specific surfactant molecules that stabilize crude oil foam are not identified. Carbon dioxide oftentimes accompanies hydrocarbon gases in reservoirs rich in natural CO 2 and fields where CO 2 enhanced recovery is implemented. Crude oil acidic components and carbon dioxide may have considerable significance to foam formation and defoaming kinetics. We studied the effect of acidic components and saturation gas on foaming of crude oils with pneumatic and depressurization tests respectively. Foaminess, foamability and time to half collapse are used to characterize foaming of oils. We present a new piecewise model that can be divided into two segments with almost equal timescales to fit the collapse curve and we use parabola function and expdec1 function to model the two segments respectively. The t values at the intersection of two segments are approximately the same as time to half collapse. Model parameter A is close to foamability. Increase in the rigidity of the interface and viscosity of the bulk liquid may account for excellent foam stability of some acids/oil systems. Some acidic crude oil components, for example, naphthenic acids, long-chain fatty acids, increase foaminess significantly, suggesting that crude oil antifoams combined with reagents that will react with some acidic components may have better performance.
研究领域:
石油工程
·
胶体与界面科学
·
提高采收率
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 17
·9737-9744
·
IF 3.049
Liexiang Ren,Jin Liu
A series of gas-separation polyamide-poly(dimethylsiloxane) (PA-PDMS) membranes containing PDMS groups were synthesized through the polycondensation reaction. The structural characteristics of polymers were evaluated by 1H-NMR spectroscopy (NMR), Fourier-transform infrared spectroscopy (FTIR) and UV-vis absorption spectroscopy. The permeability and selectivity behavior was studied at different temperatures (25–55 °C) and pressures (1.0–3.0 atm), using various gases, such as H2, O2, CO2, CH4, and N2. The effect of chemical structure, PDMS content, operating pressure and temperature on gas permeability was explored and discussed. Gas-permeation measurements showed that polyamides containing PDMS groups exhibited different separation performance. The PA-PDMS-20 membrane with 20 wt% PDMS exhibited the highest selectivity (CO2/N2 = 41.84 and O2/N2 = 7.01) at 35 °C and 3.0 atm while CO2 and O2 permeability was 29.29 barrer and 4.91 barrer, respectively.
研究领域:
材料科学
·
高分子科学
·
气体分离技术
·
膜技术
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2026
·Vol. 34
·期 5
·121
·
IF 5.6
Shan Chao,Liu Zhongying,Wu Shanshan,Qu Junjie,Mo Junhao,Sun Xiaoyi,Liu Chanjuan,Huang Xiaohua
In this work, polyethyleneimine (PEI)-functionalized multi-walled carbon nanotubes (PEI@MWCNTs) were synthesized by coating pristine MWCNTs with PEI. Subsequently, mixed matrix membranes (MMMs) containing various loadings of PEI@MWCNTs were fabricated by incorporating the aminated nanotubes into FFBA (a fluorinated copolyimide, synthesized from 6FDA, FPPAB, and BAMF) matrix. This modification strategy takes advantage of the low-diffusion-resistance tubular structure of MWCNTs to facilitate gas transport, while the abundant amino groups of PEI serve as active sites for CO 2 molecules. The PEI@MWCNTs/FFBA MMMs exhibited superior thermal stability compared with the pristine FFBA membrane. X-ray diffraction (XRD) analysis revealed that the incorporation of carbon nanotubes expanded the interchain spacing within the PI matrix, thereby increasing the free volume of the membrane. Gas permeation tests showed that, at a PEI@MWCNTs loading of 3 wt%, the CO 2 permeability increased by 74%, while the CO 2 /N 2 selectivity improved by 46%. These results indicate that the incorporation of PEI@MWCNTs enables simultaneous improvements in both gas permeability and selectivity, thus mitigating the conventional permeability–selectivity trade-off typically observed in polymer membranes. This work offers a novel and effective strategy to enhance interfacial interactions between dispersed nanomaterials and the PI matrix, showing great promise for practical gas separation applications.
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Nanomaterials
·
2026
·Vol. 16
·期 16
·1044
·
IF 4.8
Qingwu Huang,Peng Zhou,Wulin Song,Jinjin Wu
Herein, nitrogen-doped wrinkled multilayer graphene sheets (N-doped graphene) are synthesized via a facile solvothermal route followed by NH3atmosphere annealing at different temperatures. Systematic characterization by SEM, XRD, FTIR, Raman, and XPS confirms the successful incorporation of nitrogen with tunable configurations, i.e., pyridinic N, pyrrolic N, and graphitic N, whose relative fractions are strongly dependent on annealing temperature. Room-temperature gas sensing tests toward NH3reveal that the G-600 (N-doped graphene annealed at 600 °C) sensor exhibits the highest response (4.76 toward 300 ppm NH3), about 7.8 times that of G-400 (a counterpart sample thermally treated at 400 °C), along with excellent selectivity, reproducibility, and stability. Density functional theory (DFT) calculations demonstrate that pyridinic N provides the strongest adsorption affinity for NH3and the largest charge transfer, whereas graphitic N ensures superior electrical conductivity. The optimal performance of G-600 arises from a synergistic effect between abundant pyridinic N active sites for enhanced NH3adsorption and sufficient graphitic N for efficient charge transport. This work not only elucidates the mechanism of nitrogen-configuration-governed sensing behavior but also offers a rational strategy for designing high-performance room-temperature NH3sensors based on N-doped graphene.
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产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Shixiang Zhou,Li Yao,Hui Mei,Mingyang Lu,Laifei Cheng,Litong Zhang
As the operation reliability for gas sensors under complex environments is in increasing demand, the stability and safety performance are significant besides qualified gas sensing properties. In this work, structural-strengthened and self-protective ammonia sensing micro-tunnels were constructed by 3D printing . Modified methyl-silsesquioxane (MK) resin was employed as the feedstock to build the SiOC honeycomb structures . Polypyrrole (PPy) nanoparticle decorated TiO 2 arrays sensitized the structures to form inner gas-sensitive tunnels . The sensing structure exhibited high selectivity toward ammonia at room temperature. Response to 50 ppm NH 3 was 18.67%, while the response and recovery times were 119 and 86 s, respectively. The excellent long-term stability also ensured reliable operation in complex environments. More importantly, the enhanced honeycomb had an outstanding mechanical performance with the compressive strength , Young's modulus , and energy absorption of 33.72 MPa, 2.40 GPa, and 28.22 kJ/m 3 , respectively. It can serve as a load-bearing part of the fundamental component to avoid catastrophic collapse while maintaining a regular sensing capability under pressure loading as the excellent deformation resistance ensured the integrity and connection of the sensing layer. Moreover, the inner through-holes facilitated the exposure of the sensing tunnels to the atmosphere, which can detect target gas simultaneously without the embedding of extra sensors. Thus, the construction of self-protective gas sensing structures was promising to be an efficient strategy for reliable gas detection in extreme environments.
研究领域:
材料科学
·
传感器技术
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高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Yan Yuan,Wang Zhenzhong,Zhang Zitong,He Zhen,Luo Lun,Fan Jing
Tetraphenyl porphyrin (TPP) has enormous potential for use as gas chromatography stationary phases because it has a distinctive extended π–π conjugated coplanar structure and a range of interesting properties such as a good solubility in dichloromethane, high melting point, and good thermal stability. In this work, a TPP column was successfully prepared using a static method. The column was nonpolar and had a high efficiency. The chromatographic selectivity of the TPP column was assessed. The TPP column showed superiority retention and higher resolution for alicyclic, aromatic molecules through ring matching and π-π stacking interaction comparable to HP-5MS column. The unique mechanisms through which the TPP column retained polychlorinated biphenyls allowed the peak pair of 2,2ʹ,5-trichlorobiphenyl and 4,4ʹ-dichlorobiphenyl to be resolved better on the TPP column than the HP-5MS column. The TPP column was thermally stable even at 260°C for 2 h and gave results of a high degree of precision (run-to-run and column-to-column) with relative standard deviations <0.05% and <4.96%, respectively. The results indicated that porphyrin derivatives will be useful gas chromatography stationary phases.
研究领域:
分析化学
·
色谱技术
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DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2020
·Vol. 22
·期 22
·7848-7857
·
IF 9.48
Qin Dai,Jingyi Lin,Hongbin Cao,He Zhao,Guangfei Yu,Chaoqun Li,Tianyu Wang,Yanchun Shi,Guangwei Wang,Jinlong Gong
Gas–water interface mediated photoconversion of renewable biomass into fuels is a promising strategy to mitigate the impending environmental pollution and energy crisis. Herein, a gas–water interface is engineered to photoconvert fatty acids (FAs, C6–C9) into gaseous Cn-2 linear alpha-olefins (LAOs) with a high selectivity (87–91%) under mild conditions; especially, experiments with different interfaces demonstrate that the gas–water interface plays a crucial role in the enhanced selective production. The thinner molecular layer and ordered packing significantly promote the production of LAOs by maximizing the hydrogen bonding between FAs and interfacial water molecules. Furthermore, density functional theory (DFT) calculations, at the molecular level, elaborate that interfacial water could activate the reactions through hydrogen bonding lowering the reaction barrier of initial photoreaction of FAs. Additionally, different atmospheres are found to impact the pathways and products of photoconversion, thus enabling the controllable synthesis of LAOs. Unlike the metal/enzyme-involved harsh catalytic system, the gas–water interface serves as a green, low-cost and efficient ‘venue’ which can be infinitely reused for hydrocarbon production, pioneering a new way for mitigating the energy crisis and developing a truly green and sustainable society.
研究领域:
化学工程
·
可再生能源
·
环境科学
·
光化学
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DOI
高影响因子
Advanced Materials Technologies
·
2025
·
IF 6.2
Mathankumar Ganesan,Jin Li,Tongheng Cheng,Fei Wang
Pyrochlore-based metal oxide nanocomposites offer an attractive pathway for developing next-generation gas sensors by exploiting interfacial charge transfer and band engineering. Here, we report for the first time the use of Ce 2 Sn 2 O 7 /TiO 2 nanocomposites for ultra-trace NH 3 detection at room temperature. The materials are synthesized via a facile hydrothermal route and systematically evaluated against common volatile organic compounds, including ethanol, acetone, methanol, n-butanol, isopropanol, and triethanolamine. The Ce 2 Sn 2 O 7 /TiO 2 heterojunction demonstrated outstanding selectivity toward NH 3 , with the optimized CeTi2 sensor delivering an ultrahigh response of 83.8% to 100 ppm, a rapid response time of 12 and 5 s, and an exceptionally low detection limit of 2 ppb under ambient conditions (25°C). At 100°C, the prepared CeTi2 sensor displays a gas sensing response of 82.1% towards 100 ppm of NH 3 . Beyond sensitivity, the device exhibited excellent repeatability and long-term stability, and ensured reliable operation under realistic environments. Mechanistic analysis revealed that the Ce 2 Sn 2 O 7 /TiO 2 interface induces strong surface band bending and remarkably accelerates charge transport and reversible adsorption–desorption dynamics. This work establishes Ce 2 Sn 2 O 7 /TiO 2 as a pioneering platform for ppt-level NH 3 detection, offering a powerful combination of selectivity, stability, and energy-efficient operation for environmental monitoring and industrial safety.
研究领域:
材料科学
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气体传感技术
·
纳米材料
·
环境监测
·
微机电系统（MEMS）
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 5
·1-10
·
IF 2.8
Kan Hao,Yang Wenhao,Guo Zilong,Li Min
Bismuth sulfide (Bi 2 S 3 ) is known for its remarkable sensitivity and stability, making it as an ideal material for gas sensor. Here, we present a highly sensitive room-temperature NO 2 gas sensor by controlling the Bi 2 S 3 nanorods morphology through hot injection method with varying Bi/S ratios (Bi/S = 1, Bi/S = 2, Bi/S = 4). The as-synthesized samples were subsequently spin-coated onto ceramic substrates to fabricate chemo-resistive gas sensors. TEM and XPS analyses revealed that with the increasing Bi/S ratio in the precursors leading to the nanorods aspect ratios enhancing and the generation of S vacancies facilitating. As a result, Bi 2 S 3 nanorods with a Bi/S ratio of 4 exhibited higher carrier mobility and provided more accessible sites for gas molecules. The optimal sensor (Bi/S = 4) showed an impressive response of 12.2 for 10 ppm NO 2 , which is 4 times higher than the device of Bi/S = 1. It also demonstrated a fast response/recovery time of 39 s/696 s and a lower detection limit down to 120 ppb. These findings highlight the excellent gas sensitivity performance of Bi 2 S 3 nanorods at room temperature and their potential for the development of energy-efficient and cost-effective gas sensors.
研究领域:
材料科学
·
纳米技术
·
气体传感器
·
环境监测
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Jie Wang,Wenqi Zhong
Experiments on simultaneous absorption of SO 2 and NO X from sintering flue gas via a composite absorbent NaClO 2 /NaClO were carried out. The effects of various operating parameters such as NaClO 2 concentration ( m s ), NaClO concentration ( m p ), molar ratio of NaClO 2 /NaClO ( M ), solution temperature ( T R ), initial solution pH, gas flow ( V g ) and inlet concentration of SO 2 ( C S ) and NO ( C N ) on the removal efficiencies of SO 2 and NO were discussed. The optimal experimental conditions were determined to be initial solution pH = 6, T R = 55 °C and M = 1.3 under which the average efficiencies of desulfurization and denitrification could reach 99.7% and 90.8%, respectively. Moreover, according to the analysis of reaction products, it was found that adding NaClO to NaClO 2 aqueous solution is favorable for the generation of ClO 2 and Cl 2 which have significant effect on desulfurization and denitrification. Finally, engineering experiments were performed and obtained good results demonstrating that this method is practicable and promising.
研究领域:
环境工程
·
化学工程
·
能源技术
·
污染控制
·
工业生态学
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DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2025
·
IF 1.6
Zhiqing Liang,Zhongying Liu,Xiuyuan Wei,Hui Wu,Chanjuan Liu,Xiaohua Huang
Bifunctionalized NH2-UiO-66-CF3 nanofillers were successfully prepared by grafting - CF3 on NH2-UiO-66 via aldehyde-amine condensation reaction and applied to the preparation of 6FDA-ODA/NH2-UiO-66-CF3 mixed matrix membranes (MMMs). The successful introduction of -NH2 and -CF3 groups was verified by FT-IR, XRD, and XPS characterization, and the integrity of the crystal structure was ensured. Due to the presence of hydrogen bonding, NH2-UiO-66-CF3 showed good interfacial compatibility with the polymer matrix. Due to the introduction of the - CF3 group, the MMMs exhibited excellent thermal stability (T10% > 500°C, Tg = 300°C–305°C), hydrophobicity (contact angle of 92.96–97.71), and mechanical properties (tensile strength of 74–85 MPa). The gas separation performance tests showed that the MMMs exhibited significantly improved gas permeability and selectivity compared to the pure 6FDA-ODA membranes, which was attributed to the fact that the -NH2 and -CF3 groups provided more adsorption sites for gases. In particular, the PI/NUF(10) MMMs showed the best performance, with permeabilities of 42.71, 9.22, and 92.79 Barrer for CO2, O2, and He, respectively, which were 248%, 213%, and 173% higher than those of the pure membranes. Meanwhile, the selectivities of CO2/N2, O2/N2 and He/N2 were improved by 37%, 24%, and 8%, respectively. Close to the Robeson upper limit, demonstrating excellent gas separation potential.
研究领域:
材料科学
·
化学工程
·
膜技术
·
气体分离
·
纳米技术
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高影响因子
危险品化学品经营许可证（带存储）