COLLOIDS AND SURFACES B-BIOINTERFACES
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2012
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IF 3.456
Z.X. Meng,Q.T. Zeng,Z.Z. Sun,X.X. Xu,Y.S. Wang,W. Zheng,Y.F. Zheng
Surface entrapment is a convenient method to immobilize the natural macromolecules on the surface of synthetic polymers. In this study, the gelatin modified and sodium alginate/gelatin modified PLGA nanofibrous membranes were fabricated via surface entrapment and entrapment-graft techniques. The surface morphology of the each single modified PLGA nanofiber was as smooth as that of untreated PLGA nanofibers. The results of water angle contact measurements and tensile tests showed that the surface entrapment cannot only improve the hydrophilicity but also enhance mechanical properties of the modified nanofibrous membranes. In addition, the sodium alginate/gelatin modified electrospun PLGA nanofibrous membrane exhibited higher hydrophilicity and better biocompatibility than the simply gelatin modified PLGA nanofibrous membrane, which suggested the surface entrapment is a facile and efficient approach to surface modification for electrospun nanofibours membranes.
研究领域:
生物材料学
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医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Chemistry-X
·
2023
·
IF 6.1
Zhuofan Huang,Kaixin Li,Lingjun Ma,Fang Chen,Xiaosong Hu,Song Miao,Junfu Ji
The crystallization of lactose usually causes the structural collapse and core material escape of flavor encapsulations. The objective of this study was to investigate the effects of different grafting degrees of WPI-inulin Maillard reaction products on the lactose crystallization and the subsequent release behaviors. Ethyl acetate was chosen as the model volatile flavor and the encapsulations were prepared by freeze-drying. The results found that the encapsulation efficiency was significantly increased from 30% to over 80% by using MRPs as wall materials. Those microparticles showed the greater flavor retention and lower moisture adsorption. In addition, the encapsulations produced by the proper Maillard reaction times (e.g., 48 h and 72 h) could effectively delay the lactose crystallization and thus improve the structural stability of the matrix. This innovation finding aims to use the Maillard reaction to control the crystallization behaviors and enhance the usefulness of high-lactose containing products in encapsulation systems.
研究领域:
食品科学
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Yitan Wang,Li Chen,Yongsheng Yan,Ji Chen,Jiangdong Dai,Xiaohui Dai
Adjacent rare earth separation has always been one of the hardest separation tasks around world. In this article, a task-specific ionic liquid Cyphos IL 104 embedded polymer inclusion membrane (PIM) was fabricated to realize the adsorption and separation of adjacent heavy rare earth elements Lutetium (III) and Ytterbium (III). Chemical composition of the PIM was verified by attenuated total reflectance Fourier transformed infrared spectroscopy and X-ray photoelectron spectroscopy. And results confirmed only P O and P–O groups participated in the formation of Rare Earth (III)-Cyphos IL 104 complex. A typical thumb-like asymmetric structure was observed by scanning electron microscopy. And the addition of Cyphos IL 104 promoted the hydrophilicity of the PIM as the water contact angle became smaller. Static adsorption and dynamic transport performances were studied in details to get the optimum separation condition. The permeability coefficients of Yb(III) and Lu(III) were 156 μm s −1 and 114.82 μm s −1 , respectively; And the initial membrane fluxes were 90.17 μm m −2 s −1 and 65.61 μm m −2 s −1 , respectively. The separation factor between Yb(III) and Lu(III) was calculated as 1.37 under the optimized transport condition. All these would provide promising developments of adjacent heavy rare earth separation with an efficient and practical membrane strategy.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Li Xu,Xianjie Zeng,Qing He,Tao Deng,Chengyi Zhang,Wen Zhang
The separation of lithium and magnesium is crucial for the exploitation of lithium resources with a high concentration of magnesium ions (Mg 2+ ). In this study, polymer inclusion membranes (PIMs) based on the stable ionic liquid (IL) extractant system were developed for separating lithium ions (Li + ) from Mg 2+ in aqueous solutions. The mixture of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C 4 mim][NTf 2 ]) and tributylphosphate (TBP) was used as the carrier to transfer Li + , and the cellulose triacetate (CTA) polymer was chosen as the matrix due to its high compatibility with [C 4 mim][NTf 2 ] via hydrogen bond. The TBP was kept in the membrane matrix without obvious leakage in the membrane extraction process, and the lithium selectivity and extraction percentage of the membranes decrease by less than 10% after five continuous extraction operation cycles. In the transport experiment using the feed containing 7.2 mmol/L Li + and 2.06 mmol/L Mg 2+ , the PIM with 40 wt% TBP-[C 4 mim][NTf 2 ] exhibits the separation factor of 2.24 for Li + /Mg 2+ and an initial flux of 0.89 × 10 −6 mol m −2 s −1 for Li + , much higher than the results of the pure CTA membranes, indicating that TBP-[C 4 mim][NTf 2 ] system is efficient for Li + extraction in PIM membrane. Besides, the PIMs we prepared were applied to extract Li + from simulative salt-lake brines with a high Li + /Mg 2+ selectivity of 23.87. The IL-based PIMs provide a possible membrane technology to extract Li + from salt-lake brines with high stability, low energy consumption and environment-friendly.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Membranes
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2022
·Vol. 12
·期 9
·839
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IF 4.562
Xianjie Zeng,Li Xu,Tao Deng,Chengyi Zhang,Wei Xu,Wen Zhang
The separation of lithium and magnesium from salt-lake brines with high Mg2+/Li+ratios is a main challenge for lithium extraction. In this work, novel polymer inclusion membranes (PIMs) were developed by incorporating 2-ethylhexyl phosphonic acid mono 2-ethylhexyl (P507) and tributyl phosphate (TBP) as the carriers into cellulose triacetate (CTA) polymers. The Li+could be stripped from the P507-TBP extracting carriers using pure water eluents without adding concentrated hydrochloric acid, which can help decrease carriers’ leakage risk from membrane matrixes and keep the stability of PIMs. The morphology, composition, and wettability of P507-TBP-based PIMs were characterized systematically, and the carrier content in the PIM was also optimized. In the transport experiment with the feed of 0.1 mol/L LiCl and 4.0 mol/L MgCl2, the CTA/P507-TBP60% membrane exhibits a Li+permeability of 4.76 × 10−3mol·m−2·h−1and a Li/Mg separation ratio of 10.2. After recycling seven times, the selectivity of the PIM is well-retained (>10), and the permeability of Li+decreases slightly (less than 15%). With a decent selectivity and excellent stability, PIMs containing P507-TBP carriers show great potential for sustainable and efficient lithium recovery from brines with high Mg/Li ratios.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Yanan Sun,Xiangze Jia,Chin Ping Tan,Bin Zhang,Xiong Fu,Qiang Huang
The formation of inclusion complexes (ICs) between V-type starch and flavors is traditionally conducted in an aqueous system. In this study, limonene was solid encapsulated into V6-starch under ambient pressure (AP) and high hydrostatic pressure (HHP). The maximum loading capacity reached 639.0 mg/g after HHP treatment, and the highest encapsulation efficiency was 79.9 %. X-ray Diffraction (XRD) results showed that the ordered structure of V6-starch was ameliorated with limonene, which avoided the reduction of the space between adjacent helices within V6-starch generated by HHP treatment. Notably, HHP treatment may force molecular permeation of limonene from amorphous regions into inter-crystalline amorphous regions and crystalline regions as the Small-angle X-ray scattering (SAXS) patterns indicated, leading to better controlled-release behavior. Thermogravimetry analysis (TGA) revealed that the solid encapsulation of V-type starch improved the thermal stability of limonene. Further, the release kinetics study showed that a complex prepared with a mass ratio of 2:1 under HHP treatment sustainably released limonene over 96 h and exhibited a preferable antimicrobial effect, which could extend the shelf life of strawberries.
研究领域:
食品科学
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生物学
✓ 已验证
DOI
PubMed
高影响因子
Materials
·
2019
·Vol. 12
·期 19
·3097
·
IF 2.972
Hailiang Du,Ning Tan,Li Fan,Jiajie Zhuang,Zhichao Qiu,Yanhua Lei
The diffusion coatings were deposited on commercially pure Ti and Ti-6Al-4V alloy at up to 1000 °C for up to 10 h using the pack cementation method. The pack powders consisted of 4 wt% Al (Al reservoir) and 4 wt% NH4Cl (activator) which were balanced with Al2O3(inert filler). The growth kinetics of coatings were gravimetrically measured by a high precision balance. The aluminised specimens were characterised by means of scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). At the early stages of deposition, a TiO2(rutile) scale, other than aluminide coating, was developed on both materials at <900 °C. As the experimental temperature arose above 900 °C, the rutile layer became unstable and reduced to the low oxidation state of Ti oxides. When the temperature increased to 1000 °C, the TiO2scale dissociated almost completely and the aluminide coating began to develop. After a triple-layered coating was generated, the coating growth was governed by the outward migration of Ti species from the substrates and obeyed the parabolic law. The coating formed consisted of an outer layer of Al3Ti, a mid-layer of Al2Ti and an inner layer of AlTi. The outer layer of Al3Ti dominated the thickness of the aluminide coating.Keywords:diffusion coating;aluminide;pack cementation;Ti;Ti-6Al-4V;mechanism
研究领域:
材料科学
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表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Separations
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2025
·Vol. 12
·期 2
·24
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IF 2.7
Lilei Yang,Zhongwei Ding,Zhengtao Zhu,Weidong Zhang
Selective separation of hydroxylamine (HA) from metal ions to prepare high-purity HA remains a challenge. In this study, given that HA can react with carbonyl compounds, TTA (thenoyltrifluoroacetone) was screened as a carrier to prepare the polymer inclusion membrane (PIM), which was used to separate HA from metal and inorganic acid ions. The experimental results demonstrated that the PIM exhibited good selectivity for HA. During the PIM process, the proton gradient served as a driving force to transport NH2OH(I). The electrodialysis (ED) process was used to efficiently and continuously provide proton gradient without introducing other ions, which coupled with PIM to separate HA. Under the optimum conditions, the separation factors of NH2OH(I)/Na(I) and NH2OH(I)/K(I) were 30.81 and 35.11; the purity of HA was 99.4%, indicating that the PIM-ED process can be used for high-purity preparation of HA.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2024
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IF 11
Liurong Huang,Yuhan Yan,Lulu Qu,Feng Li,Lihong Chen,Yunliang Li
Soy protein isolate (SPI) offers high protein, nutritional benefits, and versatile functionality but requires modification due to its environmental sensitivity and functional limitations. To expand the functional characteristics and application scope of SPI, three types of carrageenan (Car) was used to form complexes with SPI. With the addition of carrageenan, the turbidity of SPI at its isoelectric point significantly decreased, and the turbidity curve shifted toward the acidic range. Structural analysis showed that λ-carrageenan significantly reduced the hydrophobicity of SPI from 218 to 150 when combined to SPI at a Car/SPI ratio of 1:5 ( P < 0.05). Fourier transform infrared spectra revealed that the electrostatic interaction between ι-carrageenan and SPI was the strongest at a ratio of 1:5. The emulsion stabilized by κ-Car/SPI complexes had the smallest creaming index, with a creaming index of 46.6% after 7 days of storage, which was 33.3% lower than the creaming index of the SPI emulsion ( P < 0.05). The ι-Car/SPI complexes exhibited the highest encapsulation efficiency for curcumin, with a value of 80.1%, which was 25.3% higher than the SPI ( P < 0.05). This study could provide solutions for the modification of SPI and enhance its application in the food industry.
研究领域:
食品科学
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生物化学
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产品关联
DOI
高影响因子
RSC Advances
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2024
·Vol. 14
·期 25
·17583-17593
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IF 3.9
Shan Zhu,Jiugang Hu
This study introduces a novel approach by integrating solvent extraction and polymer inclusion membrane (PIM) separation technologies to engineer an innovative PIM membrane material for the selective separation and enrichment of strategic metals, particularly copper, from polymetallic acidic solutions. The primary objectives were to streamline the technological process, reduce production costs, and enhance separation coefficients between copper and other metals. The optimal extraction conditions were determined as a mass fraction of Mextral®5640H : PVC : NPOE = 3 : 3 : 4, extraction temperature of 35 °C, and 0.9 mol L−1 H2SO4 in the stripping solution. Under these conditions, we achieved remarkable extraction efficiencies, with copper reaching 100%, and the separation coefficients between Cu2+ and Ni2+, Co2+, and Zn2+ exceeding 106. To elucidate the substantial differences in extraction performance between Cu2+ and the other metals (Ni2+, Co2+, and Zn2+), we employed an integrative analytical approach that combines FT-IR spectroscopy, BET analysis, and theoretical calculations. All extracted complexes demonstrated molecular sizes compatible with PIMs, underscoring the critical role of stability and back-extraction performance in the selective extraction of these metal ions.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CORROSION SCIENCE
·
2018
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IF 4.862
Lian-Kui Wu,Jing-Jia Wu,Wei-Yao Wu,Guang-Ya Hou,Hua-Zhen Cao,Yi-Ping Tang,Hui-Bin Zhang,Guo-Qu Zheng
A novel Si-Al composite coating was prepared on γ-TiAl alloy by a two-step method. Firstly, an aluminizing coating was fabricated on γ-TiAl alloy via pack cementation technique. Then a SiO 2 coating was prepared on this aluminizing coating via cathodic electrodeposition. The high temperature oxidation resistance of this composite coating was evaluated under 1000 °C. During the oxidation process, this Si-Al composite coating can react with TiAl and prevent the inward diffusion of oxygen from air to the film/alloy interface, resulting in the remarkable decreased oxidation rate of the alloy.
研究领域:
材料科学
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表面工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
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IF 3.45
Lin Wang,Yongshuai Xie,Dehua Ma,Luyi Zhu,Xinqiang Wang,Xiaotong Jin,Chonghe Xu,Ying Peng,Guanghui Zhang,Dong Xu
As a polycrystalline fiber, continuous zirconia (ZrO 2 ) fiber used at high temperatures will cause grain coarsening and strength degradation due to grain growth. In order to suppress the grain coarsening, zirconium carbide (ZrC) and carbon were introduced into ZrO 2 continuous fibers by pack carburizing , and ZrC/ZrO 2 composite fibers with a radial gradient were subsequently prepared. Due to the pinning effect of ZrC or carbon on the grain boundary, the movement of the grain boundary is limited. The composite fibers obtained in an argon atmosphere at 1400 °C exhibited fine grain, compact micromorphology, and a tensile strength of 784 MPa. The formation process of the composite fiber was accomplished by the interaction of external graphite carbon and internal residual carbon with ZrO 2 . This work provides a simple and economical method for preparing carbide composite fibers.
研究领域:
材料科学
·
高温材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）