PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Liang Liang,Quanbing Luo,Wenbin Xu,Minghua Liang,Hao Shen
Choosing better organic solvents and providing appropriate mixing ratios for nitrocellulose (NC) lacquer thinner is a very important topic in NC lacquer thinner industries. This paper studied the effects of cosolvents and non-solvents on ester true solvents in NC lacquer thinner. The research objects were ester true solvents (Methyl Acetate (MA) and Ethyl Acetate (EA)), alcohol cosolvents (Ethyl Alcohol (ETA), Isopropyl Alcohol (IPA), and Isobutyl Alcohol (IBA)) and non-solvents (n-Hexane (NX), n-Heptane (NP), and Petroleum Ether (PE)). Nitrocellulose lacquer dissolution experiments, explosion characteristic experiments, and algal growth inhibition experiments were performed. The results indicated that: the mixed organic solvents containing cosolvent of ETA were better than those containing the other two cosolvents (IPA and IBA) in terms of dissolution rates, explosion characteristics, and environmental influences. For non-solvent, NX was a better non-solvent as the dissolution rates of mixed organic solvents (containing MA, ETA, and NX) all kept at relatively higher levels at different non-solvent proportions. NX and PE were safer non-solvents when the concentration of non-solvent was relatively lower (16.7 %). The IC 50 values of mixed organic solvents containing non-solvent NT on Dunaliella bardawil were a little bit higher than those of mixed organic solvents containing NX or PE when the volume ratios of non-solvent were the same. In conclusion, the mixed organic solvent of MA (ester true solvent), ETA (alcohol cosolvent), and NX (non-solvent) with a volume ratio of about 4:1:1 was a relatively ideal composition for the industrial application of NC lacquer thinner.
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高影响因子
LANGMUIR
·
2022
·
IF 4.331
Yang Yang,Li Wang,Xiaojiang Li,Dan Liu,Shanshan Dai,Hongsheng Lu
Phase-selective organogelators (PSOGs) have recently attracted more attention because of their advantages in handling oil spills and leaked organic solvents. However, it is difficult to separate and recover the organic phase and PSOGs from organic gels due to the strong interaction between them. Aiming to enhance the separation and recovery performance of the organic phase and PSOGs, we synthesized a series of pH-responsive PSOGs by using itaconic anhydride and fatty amines with carbon chain lengths of C12–C18. Here, PSOGs have an excellent gelation ability in that amounts of organic solvents and fuel oil can be solidified at a low concentration (<3 wt %). It is worth noting that these gels are stronger, which is more convenient for removal by a salvage operation. More importantly, compared with traditional organogelators, pH-responsive PSOGs can easily recover the organic phase and fuel oil with an adjustment of the pH without extraction or distillation. Because of the transformation between the hydrophilicity and hydrophobicity of PSOGs by pH stimulation, 83.15% PSOGs are recovered in three-cycle experiments. In addition, the recycled PSOGs can be used to realize the removal of the organic phase again. Herein, we find that pH-responsive PSOGs could be used as promising and sustainable materials for separating and recovering organic solvents/oils and PSOGs.
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PubMed
高影响因子
Separation Science Plus
·
2022
·Vol. 5
·期 9
·513-519
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IF 0
Yanni Huang,Jia Chen,Gafang Fu,Chi Zhang,Hongdeng Qiu
This work reported the preparation and evaluation of a 2D porous graphene as the stationary phase for gas chromatography with high-resolution performance from non-polar to polar structural isomers. As a result, the dynamically coated porous graphene capillary column has a film thickness of about 16 μm. After aging treatment at different temperatures, the porous graphene capillary column exhibited high thermal stability up to 300°C. In addition, the porous graphene capillary column has good column repeatability and reproducibility. The retention time RSDs are 2.61–3.90% ( n = 3) during the days and 4.58–4.78% ( n = 3) column-to-column. This work demonstrates the advantageous separation performance of a good potential for the porous graphene as a new stationary phase for gas chromatography analysis.
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RSC Advances
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2022
·Vol. 12
·期 25
·16131-16140
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IF 4.036
Qiu-Ping He,Ying-Ying Wang,Peng-Fei Wang,Xiao-Ming Dou
Zeolite–polymer composite membranes have become promising and effective materials for the pervaporative separation of liquids, especially for isomeric mixtures. In this paper, silicalite-1/PDMS composite membranes have been used to investigate the separation of dichlorobenzene (DCB) isomers via pervaporation for the first time. Silicalite-1 zeolites modified by the silane coupling agent, NH3–C3H6–Si(OC2H5)3, have been incorporated into polydimethylsiloxane (PDMS). Then, the silicalite-1/PDMS composite membranes have been successfully prepared on porous polyvinylidene fluoride (PVDF) supports. The morphology and structure of the silicalite-1 zeolites and silicalite-1/PDMS composite membranes have been characterized by XRD, FTIR, SEM and BET techniques. The results show that the modified silicalite-1 zeolite particles have smaller pore sizes dispersed more uniformly in the active layers of the silicalite-1/PDMS composite membranes and present fewer aggregation and pinholes formed by the accumulation of zeolite particles. The silicalite-1/PDMS composite membranes are all dense and continuous with good homogeneity. To evaluate the pervaporative separation performance of the DCB isomers, the unmodified and modified silicalite-1/PDMS composite membranes have been further tested in single-isomer and binary-isomer systems at 60 °C. The modified silicalite-1/PDMS composite membranes present higher DCB isomer separation factors. The separation factors of the modified silicalite-1/PDMS composite membranes in the binary-isomer systems for p-/o-DCB and p-/m-DCB are 3.53 and 5.63, respectively. The permeate flux of p-DCB through the modified silicalite-1/PDMS composite membranes in the p-/o-DCB binary-isomer system is 116.7 g m−2 h−1 and in the p-/m-DCB binary-isomer system, it is 93.5 g m−2 h−1. The result provides a new approach towards the pervaporative separation of DCB isomers from their mixture for future industrialization applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Beibei Fan,Guoxu Liu,Xianpeng Fu,Zhaozheng Wang,Zhi Zhang,Chi Zhang
Triboelectric nanogenerators (TENGs), capable of harvesting distributed energy from the environment, have provided a viable solution for self-powered wearable electronics. However, their low power density and susceptibility to contamination still severely limit their practical application. Herein, we reported a “two-step” strategy to implement a waterproof self-powered wearable electronic device based on TENG. Firstly, Perfluoropolyether (PF) and hollow hierarchical silica (H-SiO 2 ) as fillers significantly improve the dielectric properties of polydimethylsiloxane (PDMS) composite films (PFS films) through polarization effect. Then the nano bumps of 10–30 nm are created on the surface of the films by surface etching, the bumps can increase the contact area of TENG. The voltage of TENG is improved from ∼ 67 V to ∼ 910 V and the current is improved from ∼ 1 μA to ∼ 25 μA. What’s more, the investigation of the surface structure of the PFS composite films by Atomic Force Microscope (AFM) revealed that the synergistic combination of multiple nanoscales (10–30 nm, 60–80 nm, 300–500 nm) is more favorable to achieve high performance of TENG. The surface structure composed of multiple nanoscales endows PFS with excellent superhydrophobicity. The PFS films remained fine performance after 40,000 drops of water and 90 days. This work achieves high performance and water resistance of TENG, demonstrating great potential in the field of self-powered wearable electronic devices.
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高影响因子
FUEL PROCESSING TECHNOLOGY
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2022
·
IF 8.129
Xiaokang Nie,Jiawei Qi,Shunjie Feng,Ya Liu,Bingbing Qiu,Huaqiang Chu
The mixture of n-heptane and toluene is regarded as surrogate fuel for diesel. Under the premise of a certain carbon flow rate , the particle size, nanostructure , microcrystalline size and soot deposition morphology of three kinds of fuel laminar diffusion flames were studied by Transmission Electron Microscopy (TEM), High Resolution Transmission Electron Microscopy (HRTEM), X-ray diffractometer (XRD) and Field Emission Scanning Electron Microscopy (FESEM). The three fuels were pure n-heptane (T0), toluene / n-heptane blends with 5 vol% (T5) and 10 vol% (T10) toluene, respectively. Thermophoretic probe sampling and SiC fiber deposition were used to obtain soot samples. The results showed that with the increase of toluene content, the flame height increased and the temperature decreased at the same height. The addition of toluene increased the content of PAHs , which promoted the formation of soot, and increased the number and particle size of soot. At HAB = 30 mm, with the increase of toluene content, the graphitization degree of soot increased, which showed a larger soot fringe length and a smaller fringe tortuosity, and microcrystalline width ( L a) of soot particles increased gradually. It is worth noting that the size of a new structure in the soot deposition is counted for the first time, and it is found that its size is negatively correlated with the fringe length and microcrystalline width of soot.
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高影响因子
COMBUSTION AND FLAME
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2022
·
IF 5.767
Bingjie Chen,Peng Liu,Qiang Xu,Zhandong Wang,William L. Roberts,Heinz Pitsch
As an important component of transportation fuels, toluene has little reactivity in the low temperature regime. However, the low temperature reactivity of toluene may be enhanced by the reaction of other reactive components (e.g., n-heptane) in fuel mixtures. This work examines low temperature oxidation of toluene in jet stirred reactor oxidation of an n-heptane/toluene mixture (1:1 in mole, 500–800 K, ϕ=0.5, τ=2.0 s, p = 1 bar). Two measurement techniques, time of flight molecular beam mass spectrometry using synchrotron vacuum ultraviolet radiation as the photon ionization source and gas chromatography mass spectrometry, were applied to identify and measure 32 species, including four polycyclic aromatic hydrocarbons (PAH) and oxygenated PAH (OPAH). Numerical simulations using the latest kinetic model from Lawrence Livermore National Laboratory predicted the mole fractions of fuel molecules and small intermediates well, but under-predicted the mole fractions of oxygenated aromatics (phenol, benzyl alcohol, and cresol). The identification of benzyl peroxide–an important intermediate–supported the proposed formation pathways for the identified aromatics. Model analysis highlighted the influence of H-atom abstraction, OH/H radical ipso substitution, and OH addition reactions of toluene on the formation of phenol , benzyl alcohol, and cresol, which may further grow to OPAH molecules by the addition of benzyl radical from H-atom abstraction of toluene.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Li-Hao Xu,Yan Li,Shen-Hui Li,Ming-Yu Lv,Zhi-Ping Zhao
Expanding the metal–organic frameworks (MOFs) category using room-temperature colloidal chemistry route with regular crystal structure is challenging, but important for reducing energy consumption and realizing an economically viable application in industry. Herein, we developed a novel advanced copper terephthalate MOF (CuBDC) between graphene oxide (GO) layers using a simple space-confined growth strategy at room temperature. The inclusion of CuBDC@GO can realize high filler loadings while maintaining uniform dispersion throughout PDMS matrix. The paralled arranged CuBDC sheets created 1D inner vertical channels, along with the enlarged GO interlayer space for rapid molecule permeselective transport. The resultant mixed matrix membranes (MMMs) with 30 wt% CuBDC@GO loading improved the separation factor from 190.6 to 576.3, and simultaneously increased the total flux from 575.2 to 1357.4 g m -2 h -1 for separating 0.5 wt% butyl acetate at 40 °C. The transport mechanism was explained by adjusting the CuBDC content in composites to examine the significant increase in membrane permeability (from 12.5 to 58.3) and selectivity (from 0.7 to 2.0). Compared to alcohol or ketone, the larger size strip-like butyl acetate molecules are ideal for rapid transport through the CuBDC-supported 1D continuous inner channels, and effectively inhibit the movement of water molecules, ultimately resulting in the largest pervaporation performance improvement in butyl acetate/water separation. This CuBDC@GO prepared by a simple, green and room-temperature synthesis route can be widely applied to prepare defect-free membranes with excellent performance for sustainable applications. We also anticipate that this advanced space-confined growth strategy can be extended to various other MOFs and applications.
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2022
·
IF 3.269
Hengfei Zhang,Taotao Zhan,Junshuai Chen,Xin Li,Ying Zhang,Maogang He
The speed of sound of the (n-butanol + n-heptane) mixtures was measured by the Rayleigh-Brillouin light scattering method at temperatures ranging from 298.05 to 618.29 K and pressures up to 9.0 MPa. The relative expanded uncertainty of the speed of sound experimental system is 1.2% (coverage factor k = 2). The mixing effects were analyzed from molecular interactions: the trend that speed of sound rises first and then decreases with the n-butanol concentration mainly depends on the rupture of alkanol structures and the molecular association, respectively. Lacking other thermophysical properties of mixtures at high temperature and pressure, six classical speed-of-sound mixing rules only based on pure component properties were evaluated by experimental data, including Wood, Nomoto, Van Dael, Impedance dependence relations, and Time-average model and Volume-average model. It was found that the estimates by Wood’s relation (recognized as Junjie’s relation) agree best with experimental data. The applicability of mixing rules was further evaluated by 21 mixtures of (n-alkanol + n-alkane), where Wood’s relation still obtains great accuracy (average of rRMSDs = 0.91% and maximum = 1.84%). For these (n-alkanol + n-alkane) mixtures of weak interaction, Wood’s relation is expected to give reliable estimates for the under a wide temperature and pressure range, for just insignificant volume change being ignored.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Yun-Jia Liu,Liu-Ying Yu,Ke-Jun Wu,Chao-Hong He
In this work, the thermal conductivities of 1,3-dichloro-2-propanol + N,N-dimethylformamide (DMF) were measured from 303 to 368 K at pressures up to 15.10 MPa by using a transient hot-wire method. Measurements were made for six compositions over the entire concentration range from 0 to 1 mass fractions of DMF, namely, 0.000, 0.200, 0.400, 0.600, 0.800, and 1.000 mass fractions of DMF. The experimental data were correlated as a function of temperature, pressure, and mass fraction of DMF. The expanded uncertainty of the obtained data was estimated to be 2% with a confidence level of 0.95 (k = 2).
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高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2022
·Vol. 102
·期 13
·5837-5848
·
IF 4.125
Shenglin Sun,Shuxian Hua,Yan Hong,Zhengbiao Gu,Li Cheng,Xiaofeng Ban,Zhaofeng Li,Caiming Li,Jingwen Zhou
BACKGROUND The formation of starch–lipid complexes is of interest to food processing and human nutrition. Fatty acid (FA) structure is important for the formation and structure of starch–FA complexes. However, there is limited research regarding the complexing behavior between amylose and different kinds of FAs, as well as the relationship between fine structures and digestibility of the formed complexes. This study aimed to investigate the behavior, fine structure, and digestibility of complexes formed between high amylose maize starch (HMS) and FA having various chain lengths and unsaturation degrees. RESULTS Complexes containing different FA structures showed V 6III -type crystals. Complexes containing 18-carbon unsaturated FAs displayed significantly higher complexing index ( P < 0.05) than other complexes. Complexes containing 12-carbon FAs and 18-carbon FAs with one unsaturation degree showed a higher degree of structural order and resistant starch (RS) content than other complexes. The 12-carbon FAs exhibited a higher binding degree with helical cavity of amylose than other FAs. Additionally, 10-carbon and 18-carbon saturated FAs tended to combine with HMS outside amylose helices more than other FAs. Laser confocal micro-Raman imaging revealed that the physically embedded 10-carbon and 18-carbon saturated FAs showed heterogeneous distribution in complexes, and that the complexed 18-carbon FAs with one unsaturation degree exhibited homogeneous distribution. CONCLUSION The behavior, structural order and digestibility of complexes could be regulated by FA structure. The 12-carbon FAs and 18-carbon FAs with one unsaturation degree were more suitable for the production of HMS–FA complexes with higher structural order and RS content than other FAs. © 2022 Society of Chemical Industry.
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高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Dinglei Zhong,Shoutian Qiu,Jiemei Zhou,Dongwei Ma,Yong Wang
Block copolymers are showing great potential in the preparation of advanced membranes for precise separations, and there is a strong interest in the development of hollow-fiber membranes (HFMs) from block copolymers. Herein, we report polysulfone-block-poly(ethylene glycol) (PSF-b-PEG) HFMs with enhanced separation performance prepared by a convenient stretching strategy. Axial stretching is first applied to the melt-spun PSF-b-PEG hollow fibers, efficiently reducing the wall thickness and outer diameter of the hollow fibers. The stretched hollow fibers are then subjected to selective swelling, thus producing HFMs with interconnected nanoporosity. We find that the degree of stretching significantly influences the diameter, length, and separation performance as well as the crystallization behavior of the hollow fibers before and after selective swelling. With a stretching percentage of 527%, the HFMs exhibit simultaneously enhanced water permeance and rejection because of thinned fiber walls and reduced pore sizes. This work reveals the important role of axial stretching in upgrading the performance of block copolymer HFMs and demonstrates that the selective swelling coupled with melt spinning is promising in the cleaner preparation of HFMs.
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高影响因子
危险品化学品经营许可证（带存储）