Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 24
·12435-12444
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IF 8.867
Juan Lv,Zhengjun Gong,Zhoukun He,Jian Yang,Yanqiu Chen,Changyu Tang,Yu Liu,Meikun Fan,Woon-Ming Lau
Although superhydrophobic porous membranes are considered to be very promising candidates for oil–water separation, their fabrication methods often involve complicated treatments to build a coating with micro/nano-features on a porous mesh (called “coating on a mesh structure”), which can lead to weak mechanical stability of the superhydrophobic surfaces and the formation of inhomogeneous membrane pores. Herein, we report a facile and environmentally friendly 3D printing approach to fabricate superhydrophobic membranes with an ordered porous structure for oil–water separation using hydrophobic nanosilica-filled polydimethylsiloxane (PDMS) ink. The addition of nanosilica can improve the mechanical strength of the ink and thus ensures the formation of desired topographical structures without the risk of collapsing during 3D printing. Through adjusting the geometrical parameters, a superhydrophobic PDMS membrane was obtained, which mainly depended on the roughness at the sub-millimeter scale. More importantly, the 3D printing approach described herein integrated the superhydrophobic surface into the porous framework and resulted in a mechanically durable superhydrophobic membrane, which successfully avoids the weak interface adhesion issue that arises from the traditional “coating on a mesh structure.” Moreover, the pore size of the printed membrane could be easily adjusted via a computer program to optimize both the liquid flux and separation efficiency of the membranes. The maximum oil–water separation efficiency (∼99.6%) could be achieved for the printed porous membrane with the pore size of 0.37 mm, which also exhibited a high flux of ∼23 700 L m−2 h−1.
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
JOURNAL OF BIOACTIVE AND COMPATIBLE POLYMERS
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2017
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IF 1.31
Bin Liu,Jiangying Kuang,Leishan Shao,Xinyuan Che,Fei Wang,Yinghan Wang
A series of poly(ether imide)-graft-poly(vinyl acetate) copolymers with different molecular weights were synthesized successfully and characterized using Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, proton nuclear magnetic resonance, gel permeation chromatography, differential scanning calorimeter, thermogravimetric analysis, and X-ray photoelectron spectroscopy analyses. These copolymers were used to fabricate honeycomb-structured porous films using the breath figure templating technique. The surface topology and composition of the highly ordered pattern film were further characterized using a scanning electron microscopy. The results indicated that the poly(ether imide)-graft-poly(vinyl acetate) graft molecular weight ratio influenced the breath figure film surface topology. A model was proposed to elucidate the stabilization process of the poly(ether imide)-graft-poly(vinyl acetate)-aggregated architecture on the water droplet–based templates. In addition, cell viability has been investigated via 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide test, and the cell morphology on the honeycomb-structured poly(ether imide)-graft-poly(vinyl acetate) porous film has been evaluated using a fluorescence microscope. This porous film is shown to be suitable as a matrix for cell growth.
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 POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2015
·Vol. 54
·期 5
·678-685
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IF 3.113
Chi Lv,Kun Cui,Shu-Cai Li,Hao-Tian Wu,Zhi Ma
New block copolymers Polystyrene- b -poly (2,2,2-trifluoroethyl acrylate)- b -Polystyrene (PS-PTFEA-PS) with controlled molecular weight ( M n =5000-11000 g⋅mol −1 ) and narrow molecular weight distribution ( M w / M n =1.13-1.17) were synthesized via RAFT polymerization. The molecular structure and component of PS-PTFEA-PS block copolymers were characterized through 1 H NMR, 19 F NMR, GPC, FT-IR and elemental analysis. The porous films of such copolymers with average pore size of 0.80-1.34 μm and good regularity were fabricated via a static breath-figure (BF) process. The effects of solvent, temperature, and polymer concentration on the surface morphology of such film were investigated. In addition, microstructured spheres and fibers of such block copolymers were fabricated by electrospinning process and observed by scanning electron microscopy (SEM). Furthermore, the hydrophobicity of porous films, spheres, and fibers was investigated. The porous film showed a good hydrophobicity with the water-droplet contact angles of 129°, and the fibers showed higher hydrophobicity with the water-droplet contact angles of 142°. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54 , 678–685
研究领域:
高分子化学
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材料科学
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高影响因子
POLYMER INTERNATIONAL
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2021
·Vol. 70
·期 10
·1456-1464
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IF 2.99
Chongyang Zhang,Mengzhu Li,Handong Sun,Xigui Yue
As an important part of electronic packaging materials, low-dielectric materials can ensure effective signal transmission between electronic components and have an impact on the performance of microprocessor chips. Herein, a porous poly(ether sulfone) membrane with low dielectric constant is fabricated via a breath figure method to meet requirements for high performance of new packaging materials. Perfluorononyl oxide side groups are introduced into the molecular structure of a block poly(ether sulfone) polymer by post-grafting, and the pore-making process and the dielectric properties of the materials are studied. The resulting multi-block copolymers are found to have different electric and thermal properties depending on the molar ratio of perfluorononyl oxide side groups. Regular honeycomb pores can be formed with a polymer segment length of 8/16. Besides, the porous membranes with ordered pore structure on the surface possess low dielectric constant values ranging from 1.57 to 2.19 at 10 kHz. © 2021 Society of Industrial Chemistry.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2021
·Vol. 328
·期 1
·397-410
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IF 1.371
Wang Yanlin,Long Jun,Xu Wenjie,Luo Huan,Liu Jun,Zhang Yaping,Li Jinchao,Luo Xuegang
The development of highly efficient adsorbent presents an enticing prospect for U(VI)-containing radioactive wastewater treatment. In this work, a novel porous cCS/PVA/UiO-66-NH 2 membrane absorbent comprising of crosslinked chitosan (cCS), polyvinyl alcohol (PVA) and UiO-66-NH 2 is designed and prepared. The adsorption capacity of porous cCS/PVA/UiO-66-NH 2 membrane achieves 316.50 mg g −1 under an optimal condition. Furthermore, the porous cCS/PVA/UiO-66-NH 2 membrane exhibits a high selectivity for U(VI) adsorption in simulated radioactive wastewater treatment. The possible mechanism of U(VI) adsorption onto porous cCS/PVA/UiO-66-NH 2 membrane mainly includes surface complexation and cation exchange processes. In addition, the porous cCS/PVA/UiO-66-NH 2 membrane also exhibits excellent cycling adsorption-desorption performance. All these results demonstrate that the porous cCS/PVA/UiO-66-NH 2 membrane is a promising candidate for application in U(VI) removal from radioactive wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
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IF 8.4
Lidong Feng,Yubo Xu,Long-Fei Ren,Jiahui Shao
Nanoparticle doping in membranes is an ideal strategy for improving performance of aqueous-aqueous membrane extraction (AAME). However, its derived adsorption has not been investigated regarding performance enhancement/deterioration of phenol transmembrane mass transfer they might bring, especially in porous membranes. Therefore, supercapacitor-activated carbon (YEC-8)-doped (>30 mg/g) and silica-doped membranes (<0.1 mg/g) only with differentiated adsorption capacity were prepared to identify adsorption impact on phenol extraction from saline-wastewater. Surprisingly, membrane adsorption significantly inhibited phenol transmembrane mass transfer regardless of adsorption saturation rather than enhancement as we hypothesized. Compared to PVDF membrane, extraction performance of silica-doped membrane decreased by 24.0% at 2 g/L phenol. For YEC-8-doped membrane, its extraction performance even decreased by 40%-50% when facing multiple phenol concentrations. These results stated the important role of volatilization-diffusion in phenol transmembrane mass transfer in comparison with solution-diffusion. Membrane characterization and Hagen-Poiseuille model analysis demonstrated that membrane pore complexity would induce partial performance degradation. DFT calculation further confirmed that adsorption of gaseous phenol (−1.7292 eV) within membrane pores was primary limiting step in transmembrane mass transfer. Overall, this study elucidates transmembrane mass transfer pathway, process, and mechanism of phenol in AAME with nanoparticle-doped porous membrane for the first time.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Feng Cheng,Haile Shen,Mingfan Yue,Haizhou Yu,Xiaoyan Qiu
Membrane separation technology has garnered significant interest due to its energy efficiency, environmental benefits, and molecular sieving capabilities. Polymeric membranes, despite their cost-effectiveness and processability, face challenges in balancing water permeance and selectivity, primarily due to non-uniform or sparse pore structures. Block copolymer (BCP)-based isoporous membranes, fabricated via strategies like the self-assembly and non-solvent-induced phase separation (SNIPS), offer improved pore uniformity and separation performance. This work introduces an alternative strategy to produce isoporous membranes by combining phase separation and surface tension driven micelle spreading at the air/water interface. The resulting membranes feature ordered isopores ( ca. 10 nm) and exceptional water permeance ( ca. 1450 L m −2 h −1 bar −1 ), enabling precise nanoparticle separation. The membrane demonstrates stability under 20 psi pressure, with tunable thickness (via micellar solution volume) and pore size (via water temperature). The work advances the design of high-performance isoporous membranes, offering potential applications in ultrafiltration, biotechnology, and environmental remediation.
研究领域:
材料科学
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环境科学
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生物技术
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Qi Tang,Kang Wang,Xiaoming Ren,Qunchao Zhang,Weiwei Lei,Tao Jiang,Dean Shi
Antibacterial polymer membranes have been widely used in many fields of our daily life. In this study, porous PA6 membrane with ZnO nanoparticles attaching on to the surface of inner pore walls is prepared. Firstly, SMA (styrene maleic anhydride copolymer) is used to graft onto the surface of ZnO nanoparticle in DMF (dimethylformamide). Then the pre-treated ZnO nanoparticles (ZnO-SMA) are added into SEBS (Styrene-ethylene-butylene-styrene copolymer)/PA6 (60/40 wt/wt) blends with co-continuous morphology. The effects of SMA molecular structure (molecular weight and maleic anhydride content) used for ZnO-SMA nanoparticles on their dispersion states in SEBS/PA6/ZnO-SMA nanocomposites are investigated. When SMA3 (MAH = 8 wt%, Mn = 250,000 g mol −1 ), which has relatively higher molecular weight and lower MAH content, is used as the pre-treating agent, ZnO-SMA3 nanoparticles tend to be dispersed at the phase interface in SEBS/PA6/ZnO-SMA nanocomposites. However, when SMA2 (MAH = 23 wt%, Mn = 110,000 g mol −1 ) with relatively lower molecular weight and higher MAH content is used, no ZnO-SMA2 nanoparticles locate at the interface but stay within PA6 phase. Porous PA6 membranes are obtained by selectively etching SEBS phase out with xylene. It can be found that porous PA6 membrane containing ZnO-SMA3 nanoparticles still exhibits much better antibacterial property (R = 3.76) toward S. aureus even at a very low ZnO content (0.5 wt%). This result should be ascribed to almost all the ZnO-SMA3 nanoparticles being exposed to the surface of inner pore walls of PA6 membrane. This work proposes an effective method to prepare porous polymer membrane with functional nanoparticles selectively located at the inner pore walls.
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2016
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IF 6.333
Yuyue Zhao,Zhizhang Yuan,Wenjing Lu,Xianfeng Li,Huamin Zhang
Porous membranes with different charge on the surface and internal pore walls are prepared via the solvent-responsive layer-by-layer (SR-LBL) method. The effect of charge on the transport properties of different ions through the membranes is investigated in detail. The charge property of prepared membranes is tuned by assembling different charged polyelectrolytes (PEs) on the pore walls and the surface of the porous membranes. The results show that in a vanadium flow battery (VFB), the PE layers assembled on the surfaces (including pore walls) are capable to construct excellent ion transport channels to increase proton conductivity and to tune the ion selectivity via Donnan exclusion effect . Compared with the porous membrane with negative charges (7 bilayers), a VFB single cell assembled with a positively charged membrane (7.5 bilayers) yields a higher coulombic efficiency (98%). The water and ion transfer behavior exhibits a similar tendency. In the negative half-cell, the amount of V 3+ gradually increases as cycles proceed and the amount of V 2+ stays at a low and stable level. In the positive half-cell, the amount of VO 2+ decreases; while VO 2 + is accumulated. The imbalance of vanadium ions at both sides induces the discharge capacity fade.
研究领域:
材料科学
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电化学
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 68
·40084-40091
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IF 3.049
Guohua Sun,Jiacong Guo,Hongqing Niu,Nanjun Chen,Mengying Zhang,Guofeng Tian,Shengli Qi,Dezhen Wu
Herein, we design a controllable approach for preparing multifunctional polybenzimidazole porous membranes with superior fire-resistance, excellent thermo-stability, and high wettability. Specifically, the recyclable imidazole is firstly utilized as the eco-friendly template for micropores formation, which is an interesting finding and has tremendous potential for low-cost industrial production. The unique backbone structure of the as-prepared polybenzimidazole porous membrane endows the separator with superb thermal dimensional stability at 300 °C. Most significantly, the inherent flame retardancy of polybenzimidazole can ensure the high security of lithium-ion batteries, and the existence of polar groups of imidazole can regulate the Li+ flux and improve the ionic conductivity of lithium ions. Notably, the cell with a polybenzimidazole porous membrane presents higher capability (131.7 mA h g−1) than that of a commercial Celgard membrane (95.4 mA h g−1) at higher charge–discharge density (5C), and it can work normally at 120 °C. The fascinating comprehensive properties of the polybenzimidazole porous membrane with excellent thermal-stability, satisfying wettability, superb flame retardancy and good electrochemical performance indicate its promising application for high-safety and high-performance lithium-ion batteries.
研究领域:
材料科学
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能源技术
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2022
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IF 6.449
Zicheng Chen,Xiangyang He,Jing Ge,Guangyuan Fan,Lanhe Zhang,Ashak Mahmud Parvez,Guanhua Wang
Nanofibrillated cellulose (NFC) has presented great potential as supports for functional membrane materials owing to its unique advantages. In this work, NFC-supported MOF hierarchically porous membranes were synthesized by anchoring HKUST-1 (copper 1,3,5-benzenetricarboxylate open-framework) on NFC membrane through a green DMF-free (N,N-Dimethylformamide) method at room temperature and afterward, the as-prepared composite membrane was used to remove formaldehyde from the air. The addition of HKUST-1 particles significantly increased the specific surface area of NFC membrane without affecting the NFC properties. Meanwhile, the nucleation and growth process of HKUST-1 on the NFC membrane could be effectively regulated, which further controlled the morphology of HKUST-1 as well as the anchored position of HKUST-1. When HKUST-1 was anchored on the interior and surface of the membrane, HKUST-1 reduced the compactness of the arrangement between fibers, which resulted in a hierarchical porous structure and then exposed more active adsorption sites of HKUST-1 particles. Thus, the flexible composite membranes exhibited effective formaldehyde adsorption from a low formaldehyde concentration environment (3.0 mg/m 3 ). Under the optimum conditions, the maximum adsorption capacity of the HKUST-1@NFC-1 for formaldehyde reached 378.09 mg/g (based on HKUST-1 wt), which was considerably higher than support-free HKUST-1 powders. Consequently, the present work offers a green and controllable route to prepare NFC-supported MOF composite membranes with highly effective formaldehyde adsorption capacity and thus provides a promising option for NFC application as a flexible adsorbent support.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 67
·35769-35776
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IF 3.708
Lei Hu,Aiqing Zhang,Kai Liu,Shan Lei,Guangxin Ou,Xinjian Cheng
Polyphosphazene/SiO2 composite membranes and porous polyphosphazene membranes were prepared and their properties were studied in detail. In this work, linear polyphosphazenes with 3-aminopropyltriethoxysilane (APTS) and n-butylamino side groups were prepared via the nucleophilic substitution reaction. The substituted polyphosphazenes were cross-linked by the hydrolysis of triethoxysilanes to form polyphosphazene/SiO2 composite membranes. When the as-prepared polyphosphazene/SiO2 composites were treated with HF, the silica dissolved and porous polyphosphazene membranes formed subsequently. Their structures and morphologies were studied by IR, DSA, DMA, XPS and SEM. And their mechanical properties were investigated as well. It could be seen that the thermal stability, the contact angles and the mechanical properties changed with the ratio of APTS. Namely, the contact angle changed from 74° to 96°, and the initial decomposition temperature increased from 170 °C to 225 °C when the ratio of APTS increased. Besides, the glass transition temperature increased from −48 °C to 31 °C after the membranes were cross-linked.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）