INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Qian Xu,Hongyun Wang,Meng Zhang,Jie Wang,Xiaowei An,Xiaogang Hao,Xiao Du,Zhonglin Zhang,Yongguo Li
Pervaporation technology using PEBA-2533 membranes was investigated to separate a low concentration of pyridine from the ternary mixture of pyridine, water, and NaCl. The experimental results showed that the studied membrane could achieve the enrichment of pyridine and the rejection of NaCl simultaneously. The permeation of pyridine was driven by the temperature and pyridine concentration in the feed solution. The experimental results for the effect of NaCl content on the fluxes correlated with the simulation values of water and pyridine activities. The pyridine activity values increased and water activity decreased on adding NaCl to the feed solution. What is more, it was confirmed that the accumulation of NaCl in the membrane increased with the NaCl concentration, which could influence the flux. According to the results of molecular dynamics (MD) simulations, the introduction of NaCl reduced the number of hydrogen bonds between pyridine and water, which was beneficial to the separation. The long-term operation tests for the pervaporation process showed that the poly(ether-block-amide) (PEBA) membrane had excellent stability, which proved the feasibility of pervaporation as an industrial process.
研究领域:
化学工程
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环境科学
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材料科学
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2020
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IF 3.862
Wenhao Du,Pengwei Wu,Zhixin Zhao,Xi Zhang
Aqueous dispersion polymerization is an environmentally friendly and low-energy method for the preparation of micron polymer microspheres. Crosslinked polymer microspheres could be obtained by aqueous dispersion polymerization via methods such as controlled radical polymerization. However, most of these commonly used cross-linking methods are complicated and the product is toxic. Herein, we provided a facile approach for the preparation of temperature-responsive crosslinked polymer microspheres (c-PMAD) by aqueous dispersion polymerization. Chain transfer reaction of 2-(dimethylamino) ethyl methacrylate (DMAEMA) instead of traditional crosslinkers was used to achieve the crosslinking. It is found that the microsphere is a spherical material with uniform surface, which has an average particle size of 5.21 μm in deionized water at 25 °C. It has a relatively high thermal stability. The microsphere has the upper critical solution temperature transition (UCST) behavior at 66.5 °C. The particle size of c-PMAD could increase with increasing temperature and decrease with increasing dosage of NaCl. Moreover, diameter of c-PMAD could decrease to original size with decreasing temperature, which endows it the feature of reusing. The UCST behavior of c-PMAD could be kept in 8 wt% NaCl solution. In addition, the effect of process conditions of preparation on the particle size of microspheres were studied in this paper. Micron-sized microspheres could be obtained at 45–65 °C. Microspheres size decreased with increasing initiator dosage, decreasing monomers concentration, increasing of acrylamide dosage and increasing of crosslinker dosage.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Wenxin Jiang,Jing Wang,Dan Yuan,Zhiming Gao,Bing Hu,Yanlei Li,Yuehan Wu
Agarose microgels were prepared with bottom-up approach, and emulsifying properties of agarose microgels were investigated. Physical properties of microgels are varied with agarose concentration, and further affect the emulsifying performance of microgels. Enhanced surface hydrophobicity index and decreased particle size of microgels were recorded with the increasing of agarose concentration, which were conducive to emulsifying properties of microgels. Improved interfacial adsorption of microgels was evidenced by Dynamic surface tension and SEM. However, microscopic morphology of microgel at O/W interface indicated that increasing agarose concentration could weaken the deformability of microgels. The influence of external conditions (pH and NaCl) on the physical properties of microgels were investigated, and their effects on emulsion stability were evaluated. Compared with acidification, NaCl was appeared to be more destructive to emulsion stability. Results indicated acidification and NaCl could decrease surface hydrophobicity index of microgels, but there was differentiation in the variation of particle size. It was inferred that deformability of microgels could make contribution to the stability of emulsion. This study verified that microgelation was a feasible scheme to improve the interfacial properties of agarose, and the influence of agarose concentration, pH, and NaCl on the emulsifying performance of microgels was investigated.
研究领域:
食品科学
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材料科学
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界面化学
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产品关联
DOI
PubMed
高影响因子
OPTICS EXPRESS
·
2025
·Vol. 33
·期 1
·1359-1370
·
IF 3.3
Huiyuan Zhang,Mingyu Li,Mingyu Li,Qiu-Shun Li,Qiu-Shun Li,Xiujing Yan,Yubo Xia,Yuxia Song,Tuo Chen,Wen-Fei Dong,Jian-Jun He
In this paper, poly(diallyldimethylammonium chloride)(PDDA)/poly(sodium styrene sulfonate)(PSS) nanomembranes were deposited on the surface of long-period fiber gratings (LPFG) using the electrostatic layer-by-layer (LBL) assembly method, and the effect of NaCl on the modulation of LPFG double peaks by PDDA/PSS nanomembranes was investigated. The principle behind the emergence of double peaks was first explored using coupled mode theory, revealing that changes in the mode effective refractive index(RI) occur as the number of nanomembrane layers increases. The experimental results showed that under the conditions of PDDA with NaCl/PSS without NaCl and PDDA without NaCl/PSS with NaCl, double peaks do not appear in the spectra of LPFG as the number of thin film layers increases. In contrast, highly sensitive double peaks appear in the spectra of LPFG when both PDDA and PSS contain NaCl. Additionally, the range of these double peaks was explored. It was shown that the sensitivity of LPFG to the nanomembrane reached a maximum at 79-81 bilayers, with a sensitivity of 37.8 nm/bilayer, and the appearance of double peaks was consistent with the theoretical simulation. The findings of this study will be applied to the modification of LPFG surface biofunctional membranes and the highly sensitive detection of biochemical substances.
研究领域:
光学传感
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Mengqi Xiao,Jibao Zhang,Yang Li,Yan Li,Xuejian Liu,Xiaolin Wang,Zhenyuan Yin
Hydrate-based H 2 storage has emerged as a promising solution for offshore wind-to-hydrogen applications. Seawater is widely accessible on offshore platforms and can be directly used as a hydrate former. However, effects of salt in seawater on the kinetics of hydrogen hydrate are less understood and warrants investigation. This study systematically examines the influence of NaCl on the H 2 hydrates formation in the presence of a thermodynamic promoter, 1,3-dioxolane (DIOX). Effects of NaCl on the thermodynamics, kinetics, and morphology of H 2 -DIOX hydrates were investigated. The thermodynamic inhibition on DIOX hydrates is more pronounced than that on H 2 -DIOX hydrates in simulated seawater, resulting in a slurry-like hydrate morphology that improves gas-liquid contact. H 2 final gas uptake achieved in simulated seawater is seven-fold that of pure water with H 2 only occupying 5 12 cages of sII hydrate. Our study provides insights into the direct use of seawater for offshore hydrate-based H 2 storage.
研究领域:
储能技术
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化学工程
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海洋技术
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氢能
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物理化学
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产品关联
DOI
高影响因子
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