CARBON
·
2023
·
IF 10.9
Ting Xu,Hong Huang,Tianrui Lu,Zheng-Jun Wang,Shaojun Zhu,Huile Jin,Jun Li,Xiaochun Zhou,Jing-Jing Lv,Shun Wang
Due to the recent increase in carbon-based gas diffusion layer (GDL) usage for high-rate electrochemical reactors, the study on mitigating anodic corrosion associated with the GDL is imperative. In this study, the anodic corrosion of a high-rate electrochemical flow cell was evaluated using an on-line universal gas chromatography protocol with iridium oxide supported GDL (IrO 2 /GDL) as a model electrode, and it could be evidently alleviated in the alkaline media (1 M KOH) with an inert gas (Ar or N 2 ) environment within current densities of 500 mA cm −2 . In addition, the quantitative CO 2 /CO formation rate and Faradaic efficiencies results, along with the qualitative hydrophobicity maintenance ability of the anode, revealed that the anodic oxidation reaction could be efficiently suppressed in the carbon support samples with both high graphitization and good oxygen evolution reaction (OER) activity, such as the multi-walled carbon nanotubes. Therefore, further modification of the carbon-based GDL itself may help to prevent its corrosion above 500 mA cm −2 . This work is important for tracing the origin of electrocatalysis deactivation and directing the design of carbon materials for the future electrodes that involving the GDL on a high-rate electrochemical reactor.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Yubin Zhang,Zhengsong Qiu,Xin Zhao,Jiaxing Mu,Yongle Ma,Hanyi Zhong,Weian Huang,Yunfan Liu
The friction heat generated during the drilling process of natural gas hydrate bearing sediment (HBS) leads to the temperature of drilling fluid higher than the phase equilibrium temperature of hydrate, which induces hydrate decomposition and wellbore instability. In this work, tetrabutylammonium bromide (TBAB) and Nano-silica were microencapsulated by inverse emulsion interfacial polymerization. The effect of different preparation conditions on the encapsulation rate of microcapsules was characterized by differential scanning calorimetry (DSC), and the highest encapsulation rate was 62.2% with the melting enthalpy of 121.4 J/g. Polarizing microscope, scanning electron microscope (SEM) and transmission electron microscope (TEM) images were used to characterize the synthesis process and microstructure of microcapsules, which proved a quasi-spherical structure coated with Nano-silica. Furthermore, it was confirmed that the microcapsules also had good thermal conductivity , reliability and thermoregulating performance. The rheological parameters of drilling fluid with 5 wt% microcapsules increased slightly, and the filtration loss decreased, indicating good compatibility. In addition, it is convenient to adjust the melting temperature of the core materials by adding NaCl with different concentrations. This study is of guiding significance to realize intelligent temperature-control of hydrate bearing sediment during drilling.
研究领域:
材料科学
·
能源工程
·
地质工程
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DOI
高影响因子
Petroleum Science
·
2016
·Vol. 14
·期 1
·116-125
·
IF 0.901
Wang Wei-Ji,Qiu Zheng-Song,Zhong Han-Yi,Huang Wei-An,Dai Wen-Hao
Emulsifier-free poly(methyl methacrylate–styrene) [P(MMA–St)] nanospheres with an average particle size of 100 nm were synthesized in an isopropyl alcohol–water medium by a solvothermal method. Then, through radical graft copolymerization of thermo-sensitive monomer N -isopropylacrylamide (NIPAm) and hydrophilic monomer acrylic acid (AA) onto the surface of P(MMA–St) nanospheres at 80 °C, a series of thermo-sensitive polymer nanospheres, named SD-SEAL with different lower critical solution temperatures (LCST), were prepared by adjusting the mole ratio of NIPAm to AA. The products were characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, thermogravimetric analysis, particle size distribution, and specific surface area analysis. The temperature-sensitive behavior was studied by light transmittance tests, while the sealing performance was investigated by pressure transmission tests with Lungmachi Formation shales. The experimental results showed that the synthesized nanoparticles are sensitive to temperature and had apparent LCST values which increased with an increase in hydrophilic monomer AA. When the temperature was higher than its LCST value, SD-SEAL played a dual role of physical plugging and chemical inhibition, slowed down pressure transmission, and reduced shale permeability remarkably. The plugged layer of shale was changed to being hydrophobic, which greatly improved the shale stability
研究领域:
材料科学
·
石油工程
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DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 6
·3277-3286
·
IF 4.21
Hou Ting,Shu Lian,Guo Kechun,Zhang Xiong-Fei,Zhou Shuai,He Ming,Yao Jianfeng
Cellulose-based mixed-matrix membranes containing polyethylenimine-modified graphene oxide (PEI-GO) and Zn 2+ ions were fabricated and used for gas separation.
The incorporation of PEI-GO effectively hinders the crystallinity of regenerated cellulose, and PEI-GO was compatible with cellulose matrix and uniformly distributed within the matrix. X-ray photoelectron spectrum revealed the amino group on GO surface can effectively coordinate with Zn 2+ ions in the membrane. The Zn 2+ ions content in the membranes increased when increasing the PEI-GO addition.
The optimum separation performance was achieved over the membrane with 17 wt‰ PEI-GO (RC-17) wiht the highest zinc content of 24.2 wt%. The corresponding permeability of CO 2 is as high as 268.9 Barrer, and the CO 2 /N 2 and CO 2 /CH 4 ideal selectivities could reach 48.9 and 57.4, respectively. The enhancement of CO 2 transportation was attributed to both the regulated microstructure of cellulose membrane by PEI-GO and the π-complexation mechanism of Zn 2+ ions with CO 2 molecules. The prepared membranes would have a highly potential use in the field of CO 2 separation.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 18
·14552-14558
·
IF 3.289
Jimin Hou,Huihan Huang,Zhizhong Han,Haibo Pan
CeVO4 nanorods (NRs) were successfully synthesized via a one-step hydrothermal method using disodium edentate (EDTA) as a chelating agent. The CeVO4 NRs are assigned to the zircon-type tetragonal structure and exhibited pure single-crystals as determined by XRD analysis. FE-SEM images indicate that the as-prepared samples are present as square-section nanorods, and the length and sectional size of the CeVO4 NRs are found to be ∼1.5 μm and ∼100 nm, respectively. Moreover, the HRTEM images and SAED diffraction patterns confirm that the main exposed surfaces of the CeVO4 NRs were the (010) and (004) lattice planes with a high exposed percentage (ca. 96.77%) around the NRs and the growth direction was along the (200) lattice plane. The CeVO4 NRs presents a pure phase, with no other impurity phases identified from the FTIR and Raman spectra. XPS results indicate that the vanadium atoms on the surface exhibit a mixture of valence states, i.e., pentavalent state (V5+) and trivalent state (V3+), as dangling bonds around the oxygen vacancies were induced by EDTA desorption during hydrothermal process. An acetone gas sensor based on the CeVO4 NRs was fabricated, which exhibits a significant response (0.5 s) and recovery (80 s) with high selectivity at the optimum working temperature (108 °C). This is mainly due to the presence of the trivalent states (V3+), which serve as the active sites and provide a large number of oxygen vacancies (Vo) as identified by XPS and infrabar experiments at 300 ppm O2 (0.003 atm). Moreover, it has been demonstrated that the response to acetone for the gas sensor was crucially dependent on the adsorbed oxygen (Oads) on the (010) or (004) facets of the CeVO4 NRs, where the redox reaction with acetone occurred reversibly.
研究领域:
材料科学
·
化学
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DOI
高影响因子
Energies
·
2022
·Vol. 15
·期 14
·5283
·
IF 3.252
Yuan Li,Fujian Zhou,Jie Wang,Bojun Li,Hang Xu,Erdong Yao,Longhao Zhao
During the production process, water phase incursion into the reservoir causes water blocking damage and seriously affects the production of tight gas reservoirs. Recently, nanoemulsions have been used as highly effective water blocking removing agents in the field, but their mechanism is still unclear. In this research, a series of nanoemulsions with different droplet sizes were synthesized, and their water blocking removing performance was intensively investigated. To begin, the relationship between the droplet size and the chemical composition of the nanoemulsion was determined by dynamic light scattering. Second, the influence of the nanoemulsion droplet size on the surface tension and the contact angle experiments was studied. Finally, NMR and permeability recovery experiments were used to study the relationship between the droplet size and the water locking removing effect of the nanoemulsions. Simultaneously, the surfactant release process was investigated using the static adsorption curves of the nanoemulsions. The experimental results show that the droplet size of nanoemulsion has an exponential relationship with the oil phase content. The surface tension decreases with the increase in droplet size, but the wetting reversal effect decreases with the increase in droplet size. The nanoemulsion with an oil phase content of 5 wt.% has the best water locking removing effect, and the permeability recovery value of the core reaches 59.54%. The adsorption control of the nanoemulsion on the surfactant is the key to its water blocking removing ability. This comprehensive study shows that the nanoemulsion with an oil phase content of 5 wt.% has optimum adsorption control capability. Thus, it can be used as a promising candidate for removing water blocking in tight gas reservoirs.
研究领域:
石油工程
·
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2012
·
IF 4.531
Jin-Feng Zhong,Xin-Sheng Chai,Hui-Chao Hu,Shi-Yu Fu
This paper reports on a headspace gas chromatographic method (HS-GC) for rapid determination of degree of substitution in succinic anhydride (SA) modified celluloses. The method is based on the reaction between the carboxyl groups in SA modified cellulose and bicarbonate solution in a closed headspace sample vial. The CO 2 released from the reaction was measured by HS-GC. The completion of the reaction was achieved within 25 min at 80 °C when a small sample size (<20 mg) was used. The relative standard deviation (RSD) measurement of precision was less than 4.1%, and the results were within 8.0% of those obtained with the traditional titration for determining the degree of substitution. The present method is simple, practical, automated, and suitable for use in anhydride modified cellulose research.
研究领域:
分析化学
·
材料科学
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DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Liming Song,Bing Zhao,Xiangnan Ju,Li Liu,Yimin Gong,Wenbin Chen,Bingliang Lu
In this work, the tin oxide material with different morphologies were synthesized by a simple and environmentally friendly hydrothermal method followed by calcination in air. Detail structural, chemical characterization and gas sensing examination of SnO 2 nanomaterials with different morphologies have been accomplished. Through a comparative gas sensing research among the as-synthesized SnO 2 nanomaterials with different morphologies in our work, the hierarchical SnO 2 nanoflowers shows the highest methanol gas sensitivity due to it owns the biggest surface area. The results indicate that the hierarchical SnO 2 nanoflowers is the most suitable for the detection of methanol molecule among the as-synthesized SnO 2 nanomaterials with different morphologies.
研究领域:
材料科学
·
化学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Xingyu Wu,Wei Liu,Hong Wu,Xue Zong,Leixin Yang,Yingzhen Wu,Yanxiong Ren,Chengyou Shi,Shaofei Wang,Zhongyi Jiang
In this study, novel kinds of MMMs were fabricated by incorporating ZIF-67 nanoparticles into polymers of intrinsic microporosity (PIM-1). ZIF-67 (Co substituted ZIF-8) displays stiffer Co-N bond as compared with the Zn-N bond in ZIF-8, which might led to the slightly smaller effective pore aperture of ZIF-67. Good compatibility between ZIF-67 nanoparticles and PIM-1 matrix rendered ideal interfacial morphology. The intrinsic separation performance of ZIF-67 was estimated from our experimental separation results based on the Maxwell model. The calculation demonstrated its superior CO 2 /CH 4 selectivity of 45, which is twice compared with that of ZIF-8, supporting the high molecular sieving efficiency of PIM-1/ZIF-67 MMMs. Particularly, the CO 2 and H 2 permeability increased by 15.1% and 59.6% for PIM-1 membrane with 20 wt% ZIF-67 loading, meanwhile CO 2 /CH 4 and H 2 /CH 4 selectivity increased by 34.4% and 86.96%, respectively. The strategy of incorporating highly selective ZIFs into polymers of intrinsic microporosity may have promising potential in fabricating high performance membranes for efficient gas separation.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
OPTICS EXPRESS
·
2019
·Vol. 27
·期 3
·1991-2000
·
IF 3.561
Hanyang Li,Bo Sun,Yonggui Yuan,Jun Yang
A carbon dioxide (CO2) gas sensor based on a polyhexamethylene biguanide (PHMB)-coated whispering gallery mode (WGM) microbubble resonator is proposed and verified experimentally in this work. Microbubbles were fabricated using two reverse arc discharges focused on microcapillaries. The inner wall of the microbubble was coated with a layer of PHMB using a filling and sintering process. A significant WGM resonance was observed by coupling with a tapered fiber. The experimental results show that as the concentration of carbon dioxide increases, a blue shift appears in the spectrum. Addition, a high sensitivity (0.46 pm /ppm) and a good linear relationship were obtained in the measurement range of 200-700 ppm with a detection limit of 50 ppm. The sensor features include high sensitivity, simple structure, easy manufacture, and low cost.
研究领域:
光学传感器
·
材料科学
·
环境监测
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Hua Zhang,Zhenxin Wu,Tianhua Ren,Fanli Meng
When utilizing metal oxide semiconductor (MOS) sensors for gas mixtures detection, challenges such as low detection accuracy and susceptibility to interference from ambient humidity often arise. This research presents a method for effectively identifying gas mixtures in the presence of humidity interference. Using a single commercial sensor MQ3, dynamic response data for methanol-ethanol mixture was collected across various relative humidity levels through dynamic temperature modulation. Dynamic temperature modulation allows the sensor response to be extended in the time domain to include both gas concentration and humidity information. The linear discriminant analysis (LDA) method was used to suppress the humidity interference in the response, and the gas concentration information was retained to the greatest extent. Subsequently, the data was transformed into a two-dimensional matrix using the gramian angular field (GAF) algorithm, which was then fed into the self-developed multi-head feature extraction convolutional neural network (MFE-CNN) for concentration prediction. Experimental results demonstrate that this approach effectively reduces the impact of humidity interference, outperforming other control strategies. This method is anticipated to serve as a novel strategy for the detection of gas mixtures in the presence of humidity interference.
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 2.8
Jianhang Hai,Shuli Wei,Tianlong Zhou,Jin Wang
Polymer/metal–organic framework (MOF) mixed matrix membranes (MMMs), where MOF materials are doped into a polymer matrix, have great potential in gas separation, electronic devices, sensing, and other fields. To extend the application of polymer/MOF MMMs as optical films for sensing, an in-depth investigation of their optical properties is necessary. In this work, PMMA/ZIF-8 composite films are prepared via in-situ polymerization or one-pot synthesis, with varied ZIF-8 loading amounts. The structure, morphology, gas adsorption capacity, thermal stability, and optical properties of these composite films are characterized. The results showed that the ZIF-8 crystals can be uniformly dispersed in these composite films. Nitrogen adsorption measurement also confirms this uniform dispersion, where the adsorption capacity of the composite films increases with increasing ZIF-8 loading amount. Additionally, thermogravimetric analysis proves that the introduction of ZIF-8 considerably enhances the thermal stability of the composite films. Further, the measurement results show that the refractive index of the composite films increases with increasing ZIF-8 loading amount at the wavelengths of 632.8 and 1550 nm, while the optical loss decreases at low loading amounts and slightly increases at high loading amounts due to the scattering effect. This work provides inspiration of MMM-based optical films for gas sensing.
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产品关联
DOI
高影响因子
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