Journal of Central South University
·
2014
·Vol. 21
·期 11
·4115-4120
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IF 0.464
Li Xin-she,Liu Zheng-yan,Lu Bu-shi
Ultrasound was applied for the extraction of pectin from chaenomeles . The content of pectin was evaluated by carbazole colorimetric method. Based on the results of the single factor experiment and the orthogonal tests, the optimum extraction parameters are as follows: the solid-to-liquid ratio is 1:4 g/mL, the ultrasonic power is 320 W, the ultrasonic-assisted extraction temperature is 60 °C, the ultrasonic-assisted extraction time is 50 min, and pH value is 2.0. Compared with acid hydrolyze methods, the extraction time of the present technique decreases from 70 min to 50 min, and the extraction yield increases from 1.39% to 2.61%. The results show that ultrasonic-assisted extraction is time-saving and highly efficient, so it provides a new way to extract pectin from chaenomeles .
研究领域:
食品科学
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植物化学
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DOI
高影响因子
Science China-Technological Sciences
·
2024
·Vol. 67
·期 8
·2413-2426
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IF 4.4
Cheng LeiLei,Chen RuiZhe,Zhu WeiQiang,Tian ShaoNan,Gu Jing,Yuan HaoRan,Chen Yong
The hydrogenolysis/hydrocracking of waste polyethylene (PE) has recently been intensively studied, with the general pursuit of low-temperature reaction conditions, increased oil-phase yield, and narrower carbon chain distribution. Before this, we utilized a ball-milled ZSM-22 catalyst loaded with Ru nanoparticles (NPs), which exhibited excellent hydroconversion performance. It deconstructed PE into >80 wt.% oil products under low temperatures and short reaction times. Herein, we investigated the influence of varying temperature/pressure parameters on the degree of specific hydrocracking/internal hydrogenolysis/terminal hydrogenolysis reactions. From the comprehensive energy efficiency perspective, including stirring, reaction, and product separation, as well as taking into account the degree of product isomerization and catalyst lifespan, we analyzed the optimization of parameters. This research abandons the notion that lower temperatures are better and proposes a more comprehensive evaluation framework for low-consumption hydroconversion of PE to produce high-value products.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2015
·
IF 2.947
Le Zhang,Hao Yang,Xuebin Qiao,Tianyuan Zhou,Zhongying Wang,Jian Zhang,Dingyuan Tang,Deyuan Shen,Qitu Zhang
Spray drying parameters have been systematically optimized to granulate a stoichiometric mixture of commercial oxides for YAG transparent ceramics. The processing parameters and suspension composition were changed in sequence and SEM analysis , EDS , MIP and transmittance measurements, were used to choose the best spray drying parameters. The optimized inlet and outlet temperatures of drying medium were 75 and 60 °C, and its flux and aspiration rate were 25 Hz and 30 Hz, respectively. The balanced suspension composition were: solid content 45 wt.%, binder PVB 1.0 wt.%, dispersant DS005 0.50 wt.% and the atomizer rotating speed 8000 r/min. The granulated particles exhibited excellent forming performance with mono-dispersed, spherical and fully dense aggregates, and mean size was ∼40 μm. They could be crushed under 40 MPa. The homogeneous distribution and microstructure of ceramics assured the high optical quality of YAG ceramics.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
Catalysts
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2023
·Vol. 13
·期 2
·248
·
IF 3.9
Gaokui Chen,Qiuwan Shen,Xin Zhang,Zhongwen Cai,Zicheng Shao,Shian Li,Guogang Yang
In this study, a series of A-site strontium-doped La1-xSrxCeO3-δ(x = 0.2, 0.4, 0.6, 0.8) perovskite catalysts were synthesized via the ethylenediaminetetraacetic acid (EDTA) sol-gel method for hydrogen production by methanol steam reforming. The fresh and the reduced catalysts are characterized by scanning X-ray (XRD), energy dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) techniques. Results showed that La0.6Sr0.4CeO3-δexhibited the best performance among the La1-xSrxCeO3-δcatalysts. The operating parameters were optimized to study the catalytic performance of La0.6Sr0.4CeO3-δ, including catalytic temperature, water–methanol ratio (W/M) and liquid hourly space velocity (LHSV). However, the excessive strontium content led to a decrease in hydrogen production amount per unit time, and the high W/M promoted the reverse water–gas shift reaction (RWGS), which resulted in a decrease in CO selectivity and an increase in CO2selectivity. In addition, the optimal reaction parameters are as follows: reforming temperature of 700 °C; W/M of 3:1; LHSV of 20 h−1. Furthermore, the methanol conversion rate of La0.6Sr0.4CeO3-δcan reach approximately 82%, the hydrogen production can reach approximately 3.26 × 10−3mol/g(cat)/min under the optimum reaction conditions. Furthermore, La0.6Sr0.4CeO3-δexhibits high hydrogen selectivity (85%), which is a promising catalyst for MSR application.
研究领域:
化学工程
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催化材料科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Ye Yuan,Fei Shi,Qinghua Li,Yi Yang,Xiangyu Cai,Menglong Sheng,Zhi Wang
The increasingly serious situation of CO 2 emissions compels researchers to pay extensive attention to industrial processes for carbon capture. Membrane-based separation technology is widely regarded as a promising reserve method for carbon capture, featuring a wide adjustment range, flexible operation and modular design. In this work, a large-scale interfacial polymerization membrane production process for carbon capture was developed together with the construction of novel interfacial polymerization equipment with an adjustable organic phase bath and surface cross-linking unit. A monomer suitable for efficiently preparing high-performance CO 2 separation membranes was selected through a combination of experiments and simulations. The effect of production conditions on the structure and performance of large-scale membranes was investigated. The performance resilience at high pressure and short-term stability in the presence of impurities of the optimized membranes were examined. Techno-economic evaluation targeting carbon capture from post-combustion gas verifies the significant industrial application potential of the membranes.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
POWDER TECHNOLOGY
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2024
·
IF 4.5
Yuxiao Xue,Deqing Zhu,Jian Pan,Gen Li,Xuewei Lv
In this paper, two types of Ni-Cr bearing composite burdens including SP1 (79% Ni-bearing sinter and 21% Cr-bearing oxide pellets) and SP2 (84% Ni-bearing sinter and 16% Cr-bearing pre-reduced pellets) were used for the more efficient preparation of high-Cr ferronickel . Based on the metallurgical performance characterization, thermodynamic analysis and smelting parameters optimization, the qualified high-Cr ferronickel were prepared by the utilization of the Ni-Cr bearing composite burdens. The recovery rates of iron, chromium and nickel exceed 95%, 90% and 98% whereas their grades are 85.56–85.88%, 7.82–8.02% and 1.59–1.62%, respectively. Compared with SP1, SP2 possesses lower smelting duration, which indicates the appropriate proportioning of Cr-bearing pre-reduced pellets is beneficial for the smelting process. The obtained high-Cr ferronickel consisting of (Fe, Cr) 3 C and (Fe, Cr) 7 C 3 can be used as a low-cost substitute for the conventional raw materials of 200 or 300 series of stainless steel .
研究领域:
冶金工程
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材料科学
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DOI
高影响因子
Foods
·
2023
·Vol. 12
·期 5
·975
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IF 5.2
Xuyang Ding,Fujun Liu,Rui Zheng,Xuechen Pei,Ziye Wang,Dayong Zhou,Fawen Yin
High-purity eicosapentaenoic acid (EPA) ethyl ester (EPA-EE) can be produced from an integrated technique consisting of saponification, ethyl esterification, urea complexation, molecular distillation and column separation. In order to improve the purity and inhibit oxidation, tea polyphenol palmitate (TPP) was added before the procedure of ethyl esterification. Furthermore, through the optimization of process parameters, 2:1 (mass ratio of urea to fish oil, g/g), 6 h (crystallization time) and 4:1 (mass ratio of ethyl alcohol to urea, g/g) were found to be the optimum conditions in the procedure of urea complexation. Distillate (fraction collection), 115 °C (distillation temperature) and one stage (the number of stages) were found to be the optimum conditions for the procedure of molecular distillation. With the addition of TPP and the above optimum conditions, high-purity (96.95%) EPA-EE was finally obtained after column separation.
研究领域:
食品科学
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生物化学
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DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Yue Wang,Yancheng Wang,Chenhao Mao,Deqing Mei
Vat photopolymerization is a widely employed additive manufacturing (AM) technique that commonly applying a digital light processing (DLP) light engine to provide a patterned light source. Notably, printing extreme-size structures is challenging, and the selection of printing parameters was currently highly reliant on repeatable trial-and-error experiments. In this work, a theoretical model for curing depth prediction was established by observing the effect of light intensity. A correction factor n was introduced to optimize the relationship among the critical curing energy, exposure time, and light intensity. Forming experiments verified the accuracy of the proposed theoretical curing depth prediction model, and a correction factor n equal to 0.75 was obtained. Optical rheological characterization experiments and Fourier transform infrared spectroscopy (FTIR) supported the quantitative characterization of the DLP printing process while revealing a stepwise transition during photocuring. Finally, a guidance for quick selection of the optimal curing time for 3D structure was obtained and applied to the high-precision microstructure printing process. High-fidelity microneedle arrays with 12 μm details were printed. This method of rapid selection of printing parameters and printing microstructures with high-precision details can potentially be used in the field of 3D bioprinting.
研究领域:
材料科学
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生物制造
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光学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 130
·期 5
·3600-3610
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IF 1.395
Mengzhu Liu,Zhiqiang Cheng,Yi Jin,Xin Ru,Dawei Ding,Junfeng Li
Poly( l -lactide- co -ε-caprolactone-diOH) (PCLA) with (ABA) n type is synthesized using poly(lactic acid) (PLA) and poly(ε-caprolactone) di-OH (PCL-diOH) via chain extending method. FT-IR, 1 H-NMR, and GPC data demonstrate that PLA and PCL-diOH have reacted completely. The product is electrospun into ultrafine fibers subsequently. The optimum electrospinning parameters obtain from an orthogonal experiment are a solvent ratio (DMF/DCM) of 5/5, a polymer concentration of 28 wt %, a collector distance of 20 cm and a voltage of 18 kV. As a result, the average diameter of fibers is 0.77 µm and the uniformity is above 80%. Via range analysis, it is found that the order of the influence on diameter is solvent ratio, applied voltage, collector distance, and polymer concentration, successively. Single effect of the four governing factors on diameter and morphology is also experimentally investigated. This may provide clues for obtaining fibers with various structures by controlling the parameters. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 3600–3610, 2013
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2021
·
IF 2.262
Li Chao,Haiwang Wang,Xinfang Wei,Jinlong Li,Cheng Ji,Xiwei Qi
At present, the polymer flocculation technology has been widely used in the treatment of oil sand tailings. However, the current composite flocculant still has the problems of low flocculation efficiency and serious secondary pollution after using. In this article, cationic composite flocculant SiO2-TiO2-P(AM-DMC) with self-degrading characteristics was prepared by the surface photoinitiated polymerization technique. Above all, in order to study the synthesis process of SiO2-TiO2-P(AM-DMC), cationic composite flocculant was characterized by FTIR, TG, TEM, XPS, etc. Furthermore, the central composite design (CCD) and response surface methodology (RSM) were used to optimize the preparation parameters of the cationic composite flocculant. And the optimization results of preparation parameters of cationic composite flocculant showed that the optimal preparation parameters of SiO2-TiO2-P(AM-DMC) were as follows: mDMC: mAM = 5, monomer concentration was 35% and reaction time was 100 min. Ultimately, the flocculation parameters of SiO2-TiO2-P(AM-DMC) were optimized by CCD and RSM. Moreover, the optimization results of flocculation parameters of cationic composite flocculant showed that the optimal flocculation parameters of SiO2-TiO2-P(AM-DMC) were as follows: pH = 5, flocculant dosage was 30 ppm, kaolin concentration was 1.36%. In summary, this work had greatly enriched the knowledge of oil sand tailings treatment, and had the extremely important reference significance for realizing the parameter regulation of high-efficiency flocculation of oil sand tailings.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Ruhui Xu,Xinhai Li,Siqi Tang,Zhixing Wang,Huajun Guo,Wenjie Peng,Ding Wang,Jianguo Duan,Jiexi Wang,Guochun Yan
Accurate failure analysis plays a pivotal role in the optimization design and lifetime prediction of 4.45 V high-voltage LiCoO 2 /Graphite (LCO/Gr) batteries . Multiphysics coupling model brings great opportunities to conduct battery failure analysis quantitatively, although it is quite challenging because many model parameters need to be handled properly. Herein, we systematically elaborate the differences of ion and electron transport properties before and after cycling ageing of LCO/Gr batteries by constructing direct current internal resistance (DCR) decomposition model. The key parameters acquisition method is established, and the mechanism of DCR growth is elucidated. Furthermore, the aforementioned model parameters are refined by using a hybrid power pulse characteristics (HPPC) curve optimization algorithm based on DCR decomposition results obtained from the three-electrode battery system. Through analyzing the influence of single-factor parameter ageing on battery voltage output capacity and discharge temperature rise, the main factors affecting battery failure process are identified. For instance, the account of the positive electrochemical reaction resistance related to the k pos increased from the initial 22.9% of total DCR to 37.3% after ageing. This work provides a reliable quantitative analysis basis for the global optimization design of advanced LIBs .
研究领域:
电化学
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材料科学
·
能源工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shanxin Li,Zhiqi Zhai,Yijing Sun,Sichen Guo,Ting Peng,Hongying Yu,Xuzhou Jiang
The development of stealth materials with both efficient corrosion resistance and low-frequency microwave absorption is highly necessary. In this work, neural-structured Co@C/MWCNTs nanocomposites were successfully synthesized through a facile co-precipitation method, followed by a subsequent pyrolysis process. By adjusting the pyrolysis temperature, the pore structure, crystallinity, degree of graphitization, and electromagnetic parameters of the material were optimized. This optimization achieved a multi-mechanism synergistic effect in the low-frequency region (C-band), including impedance matching, dielectric loss, conductive loss, and magnetic loss. The results indicated that NCN-700 achieved a minimum reflection loss ( RL min ) of −64.31 dB at 4.88 GHz. Additionally, the neural-structured Co@C/MWCNTs nanocomposites exhibited significant effectiveness in low-frequency radar stealth applications, while also displaying superior corrosion resistance, self-corrosion potential ( E corr = 0.52 V), and self-corrosion current density ( I corr = 2.58 × 10 −6 A/cm 2 ). These findings suggest the promising potential for neural-structured Co@C/MWCNTs nanocomposites in applications related to low-frequency microwave absorption and corrosion protection.
研究领域:
材料科学
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电磁学
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防腐蚀工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）