FLUID PHASE EQUILIBRIA
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2017
·
IF 2.473
Qiaoyan Shang,Shuqian Xia,GuanWei Cui,Bo Tang,Peisheng Ma
Interfacial tension (IFT) is crucial for characterizing the phase and interphase behavior in the enhanced oil recovery (EOR) process. CO 2 and N 2 are commonly used as injection gases in the EOR process. In this work, an experimental apparatus using the pendent drop method was adopted to measure IFTs for the EOR process with different injection gases, temperatures (40.0–120.0 °C) and pressures (0.22–17.32 MPa). The relative Gibbs adsorption isotherm ( Γ ij ) of a species i on species j were calculated by the experimental IFTs. Theoretically, new correlations were proposed to predict paraffin IFTs for pure CO 2 and mixture gas (CO 2 + N 2 ) injection. A total of 561 and 268 experimental IFTs were used to derive the correlations for pure CO 2 and mixture gas injection, respectively. The square of correlation coefficient ( R 2 ), root mean square error ( RMSE ) and average absolute relative deviations ( AARD ) for pure CO 2 were 0.9884, 0.58 and 5.45%, respectively. For the mixture gas injection, the R 2 , RMSE and AARD of the correlation were 0.9851, 0.57 and 4.47%, respectively.
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SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Hui Chen,Guo-Dong Li,Meihong Fan,Qian Gao,Jiabo Hu,Saren Ao,Cundi Wei,Xiaoxin Zou
Transition metal spinel semiconductors, with a general formula of AB 2 O 4 , have been shown as a promising group for gas sensor applications. This paper reports a simple and effective electrospinning method to systematically prepare mesoporous MGa 2 O 4 (M Ni, Cu, Co) nanofibers. It is found that gas sensing reaction process of the materials is decisively influenced by transition metal M(II)-ions. The gas response tends to decrease in the order of NiGa 2 O 4 > CuGa 2 O 4 > CoGa 2 O 4 . In addition, NiGa 2 O 4 and CoGa 2 O 4 show p-type behaviors, and CuGa 2 O 4 shows an n-type behavior. Further analysis reveals that charge carrier hopping (e − hopping or h + hopping) processes between different valent metal cations, which is mainly dominated by octahedral sites of spinel, are responsible for the conductivity type, the surface redox reaction and thereby the gas sensing properties.
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JOURNAL OF CHROMATOGRAPHY A
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2016
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IF 3.926
Jianlin Peng,Yan Zhang,Xiaohong Yang,Meiling Qi
Efficient separation of xylenes, phenols and anilines is a big issue in chemical and petroleum industries. This work presents the first example of employing poly (caprolactone) diol (PCL-Diol) as stationary phase for high-resolution gas chromatographic (GC) separations of these tough isomer mixtures. It showed medium polarity and stronger H-bonding basicity than H-bonding acidity. Impressively, PCL-Diol column exhibited extremely high resolving capability for the isomer mixtures of xylenes, cresols/xylenols, and toluidines/xylidines with good peak shapes. Moreover, it exhibited preferential retention for analytes of a linear alkyl chain, suggesting its shape fitting selectivity for specific analytes. In addition, its separation performance has good repeatability with RSD values on retention times below 0.01% for run to run ( n = 6), 0.67–0.80% for day to day ( n = 4) and 3.2–4.4% for column to column ( n = 4) repeatability, respectively. Furthermore, it was applied for the determination of isomer impurities in real samples, showing good potential for practical use. This work demonstrates the advantageous high-resolution separation performance for challenging isomers and shows its promising future of PCL-Diol-based materials in separation science.
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PubMed
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MATERIALS & DESIGN
·
2016
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IF 3.997
Chunpei Yu,Wenchao Zhang,Ruiqi Shen,Xing Xu,Jia Cheng,Jiahai Ye,Zhichun Qin,Yimin Chao
The performances of nanothermites largely rely on a meticulous design of nanoarchitectures and the close assembly of components. Three-dimensionally ordered macroporous (3DOM) NiO/Al nanothermite film has been successfully fabricated by integrating colloidal crystal template (CCT) method and controllable magnetron sputtering. The as-prepared NiO/Al film shows uniform structure and homogeneous dispersity, with greatly improved interfacial contact between fuel and oxidizer at the nanoscale . The total heat output of 3DOM NiO/Al nanothermite has reached 2462.27 J·g − 1 at optimal the deposition time of 20 min, which is significantly more than the values of other NiO/Al structural systems that have been reported before. Intrinsic reduced ignition temperature (onset temperature) and less gas production render the wide applications of 3DOM NiO/Al nanothermite. Moreover, this design strategy can also be readily generalized to realize diverse 3DOM structured nanothermites.
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JOURNAL OF MEMBRANE SCIENCE
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2016
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IF 5.557
Qingping Xin,Huanran Liu,Yuan Zhang,Hui Ye,Shaofei Wang,Ligang Lin,Xiaoli Ding,Bowen Cheng,Yuzhong Zhang,Hong Wu,Zhongyi Jiang
Appropriate facilitated transport carriers and water environment are two principal factors for efficient CO 2 membranes separation . In this study, the facile distillation-precipitation polymerization (DPP) and atom transfer radical polymerization (ATRP) methods are consecutively used to prepare polymer brushes functionalized double-shelled organic submicrocapsules, and the resultant organic submicrocapsules are incorporated into sulfonated poly(ether ether ketone) (SPEEK) to fabricate mixed matrix membranes (MMMs). The doubled-shelled structure provides abundant facilitated carriers by the outer shell and high water retention property by the inner shell simultaneously. The organic submicrocapsules (b-IM@PMMA) are homogeneously embedded in the SPEEK matrix, and abundant amine groups on polymer brushes of outer shell increase the content of CO 2 -facilitated transport sites in MMMs. The inner shell renders the organic submicrocapsules of higher water content, yielding the MMMs with enhanced water retention properties. Moreover, the incorporation of organic submicrocapsules increases the water uptake and water retention capacity of MMMs. The MMMs doped with organic submicrocapsules display better CO 2 separation performance than the MMMs doped with double-shelled organic submicrocapsules without brushes. The polymer brushes functionalized double-shelled organic submicrocapsules act as water reservoirs to not only offer more water for the dissolution of CO 2 gas molecules, but also construct and widen interconnected continuous CO 2 -facilitated transport passageways. The highest CO 2 /CH 4 (N 2 ) selectivity is 73.8(76.3) for the SPEEK/b-IM@PMAA MMMs (at a CO 2 permeability of 2236 Barrer) in pure gas, surpassing the 2008 Robeson upper bound.
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RSC Advances
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2015
·Vol. 5
·期 34
·27211-27223
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IF 3.84
Shu Zhu,Mengqi Shi,Song Zhao,Zhi Wang,Jixiao Wang,Shichang Wang
In this work, polyethersulfone (PES)/polyaniline (PANI) nanocomposite membranes were fabricated by an immersion precipitation process through incorporation of uniform and well-dispersed PANI nanorods. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) were used to identify the nanoparticle size and dispersion. The influence of incorporated PANI nanorods on membrane structure was investigated by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and scanning electron microscopy (SEM). The properties of the nanocomposite membrane were evaluated by water contact angle, cross-flow ultrafiltration (UF) and antifouling measurements. The results indicated that the surface pore structure and hydrophilicity of PES membrane were improved by the incorporation of PANI nanorods. The PES/PANI nanocomposite membrane showed higher flux and better antifouling properties compared to the pure PES membrane without sacrificing the separation performance of BSA protein. Meanwhile, PES/PANI nanocomposite membrane was also used as the substrate to prepare a gas separation composite membrane by coating polyvinylamine (PVAm) aqueous solution on the surface. The gas permeation results showed that the PVAm/PES/PANI composite membrane exhibited higher gas permselectivity for CO2–N2 separation than the PVAm/PES composite membrane, which may result from the improved surface porosity of PES/PANI substrate and the improved interface adhesion between the selective layer and the substrate.
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ANALYST
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2015
·Vol. 140
·期 9
·3107-3112
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IF 4.107
Ye-Yu Wu,Cheng-Xiong Yang,Xiu-Ping Yan
The unique properties of metal–organic frameworks, such as diversity in structures and pore sizes, high surface area, shape selectivity and available to functionality make them as potential materials of the stationary phase for gas chromatography. Here we show an in situ growth approach to the fabrication of zeolite imidazolate framework-90 (ZIF-90) bonded capillary column for gas chromatography separation. ZIF-90 was directly grown onto the inner wall of the carboxyl modified capillary via the coordination between Zn(II) and carboxyl group. The fabricated ZIF-90 bonded capillary column acted as a weak polar stationary phase. It not only exhibits high capacity in the separation of linear molecules, but also offers excellent features for the separation of 2- and 3-substituted ketones.
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PubMed
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POLYMER COMPOSITES
·
2024
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IF 4.8
Yingjun Li,Yingchun Lu,Yunpeng Li,Hanwen Duan,Chaoyi Zhu,Yuanlin Zhou
The strategic alignment of nanoplatelets within polymer matrices is pivotal for the development of nanocomposites with superior gas barrier characteristics. In this work, the effect of lamellar particles orientation in polymer for gas permeation was demonstrated. The magnetic α-Al 2 O 3 (Al 2 O 3 @PDA-Fe 3 O 4 ) was first prepared by in situ growth of Fe 3 O 4 nanoparticles immobilized on polydopamine (PDA)-modified Al 2 O 3 surface. Subsequently the orientation of magnetic α-Al 2 O 3 in brominated butyl rubber (BIIR) was achieved by modulating the applied magnetic field direction. Results show that the PDA, as the role of surface adhesive, not only anchored Al 2 O 3 substrate but also bound ferric ions for the further in situ formation of Fe 3 O 4 , which ensured the physico-chemical stability of the magnetic α-Al 2 O 3 . Comparison of hydrogen permeation performance of composites with in-plan, middle-of plane and out-of plane alignment demonstrated the effect of lamellar particles orientation. The Al 2 O 3 @PDA-Fe 3 O 4 /BIIR composite with in-plane alignment had the best hydrogen barrier property by a 50% reduction in hydrogen permeability coefficient compared to the neat BIIR, underscoring the critical role of particle orientation in enhancing the gas barrier properties of nanocomposites. Highlights The structural stability of magnetic Al 2 O 3 nanocomposites was enhanced by polydopamine (PDA). The composites with in-plane alignment, middle-of plane alignment and out-of plane alignment were prepared by a magnetic field. The effect of lamellar particles orientation on gas permeation of polymer nanocomposites was studied. The composites with in-plane alignment possesses the best gas barrier property.
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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Jiang-yi Zhang,Gui-ming Zhang,Ya-Nan Wang,Wen-jing Liu,Zhi-fang Xu
Determining the Si isotopic compositions of samples of the Earth’s surface is crucial to understanding the implications of the biogeochemistry cycling of Si. This study established an alternative method for high-precision Si isotopic measurement in soil samples using gas-source isotope ratio mass spectrometry, which involved the conversion of Si in the samples into SiF 4 gas, which was purified cryogenically and collected for isotopic analysis. The proposed method was applied to determine the Si isotopic composition of two reference materials (GBW04421 and GBW04422), and the results were found to be in good agreement with the certified values. Moreover, the proposed method exhibited a long-term measurement precision of 0.05 ‰–0.08 ‰ (2 s) for the δ 30 Si values. The δ 30 Si values obtained from ten soil reference materials ranged from −1.84 ‰ to −0.17 ‰, which were within the range of the values reported in the literature (−1.82 ‰ to −0.15 ‰). The sample preparation and analysis method in this study provided an easy and effective approach to determining the Si isotopic composition of solid samples and offers to the promise of being applicable to biogeochemical analyses of the Earth’s surface processes.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Rou-Yu Li,Wenyu Yuan,Meng-Ru Cui,Boda Li,Hui Zhang,Zhenhao Peng,Quan-Guo Zhai
The interfaces in heterostructure photocatalysts play an important role in charge migration, but the rational controllable interfacial construction remains a challenge. Herein, a covalently bonded interface with delocalized π bonds was controllably constructed via the encapsulation of UiO-66-NH2 nanoparticles in MUV-10 skeletons. The UiO-66-NH2/MUV-10 heterojunction enabled both efficient capture and conversion of CO2 and H2O. The delocalized π bond in the covalent interface efficiently accelerated interfacial charge migration, suppressed carrier recombination, and reduced the work function for electronic effusion. As a consequence, UiO-66-NH2/MUV-10 exhibited superior CO2 photoreduction activity with H2O under visible light irradiation in the gas–solid phase. The CO evolution rate reached as high as 38.7 μmol g−1 h−1, which surpassed that of most commonly reported gas–solid phase photocatalysts. This work not only provides a feasible strategy for the controllable construction of interfaces but also demonstrates the great potential of interfacial engineering for efficient photocatalysis and other related areas.
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OPTIK
·
2024
·
IF 3.1
Song-Hyok Kim,Kyong-Su Sonu,Pyol Kim,Jin-Hyok Ri,Kwon-Il Ryu,Chol-Il So,Sol-Gwang An,Il-Bok Choe
Recently, hole-conductor-free perovskite solar cells (PSCs) with carbon counter electrode (CCE) have attracted great attention for its high stability and low fabrication cost. Furthermore, it would lower the cost and simplify the manufacturing process of PSCs by low temperature processing instead of high temperature sintering for fabrication. In this case, however, it is very important to improve the interfacial contact between perovskite layer and CCE. In this work, we for the first time introduce solid-gas reaction between dimethylammonium lead iodide (DMAPbI 3 ) in solid state under carbon layer and methylamine (MA) gas passed through CCE which is formed at low temperature of 120 ℃. Based on Brunauer-Emmett-Teller (BET) measurement and XRD analysis , it is found that MA gas can pass through our low-temperature CCE and perovskite crystals could be successfully formed by the reaction with DMAPbI 3 . In this case, due to the existence of liquid crystal intermediate state and volume expansion, interfacial contact would become better and the charge transfer and recombination characteristics have improved considerably. The best performance devices based on optimized MA gas treatment time exhibit higher efficiency of 12.4% than that of PSCs fabricated by conventional ways with low-temperature processed CCE (9.6%).
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hui Xu,Haoran Zhong,Jinwu Hu,Xianjun Rong,Wenhui Zhang,Yinsheng Wang,Shengjuan Li,Guisheng Li,Ding Wang
Aiming to achieve high-sensitivity volatile organic compounds (VOCs), it is of great significance to continuously enhance the sensing performance of metal oxide based sensors. Herein, novel NiO nanoplates-decorated on SnO 2 nanofibers 1D core–shell structures derived from metal-organic frameworks (MOFs) are fabricated by the facial solvothermal method and heat treatment for VOCs gas sensors. The morphology and composition of 1D core shell SnO 2 @NiO are regulated by solvothermal time in the range of 0 ∼ 24 h. Based on the unique structure and composition of SnO 2 @NiO, SnO 2 @NiO with 4 h solvothermal time (denoted as SnO 2 @NiO-4) exhibits excellent selectivity, high response (R a /R g = 25.6) and low detection limit as well as good response linearity between response and concentration of xylene. Especially, the obtained SnO 2 @NiO-8 and SnO 2 @NiO-16 show the high sensitivity to acetone (R a /R g = 28.7) and triethylamine (R a /R g = 13.7), respectively. Structural characterizations such as SEM, TEM, and Mott-Schottky results demonstrate the core–shell structure with p-n heterojunction. In-depth investigations on reaction mechanism reveal XPS, photoluminescence (PL), and ESR testing reveal the intrinsic defects such of oxygen vacancy and Ni 3+ active sites. And in situ FTIR, online mass spectroscopy, as well as UV/UPS analysis further discover the evolution of intermediates and products during the surface catalysis reaction. These results demonstrate that the remarkable sensing performance of SnO 2 @NiO-8 can be attributed to several factors, including abundant oxygen vacancy, formation of p-n heterostructure and efficient Ni 3+ /Ni 2+ catalyzing, which beneficial for increased active sites and enhanced electron transport. This synthetic strategy provides an effective method for the facile engineering of high-performances metal oxide-based sensors towards practical health assessment.
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