ULTRASONICS SONOCHEMISTRY
·
2012
·
IF 3.567
Mi-mi Tao,Fu Liu,Li-xin Xue
Poly(vinylidene fluoride) (PVDF) membranes were prepared by an ultrasound assisted phase inversion process. The effect of ultrasonic intensity on the evolution of membrane morphology with and without the addition of pore former LiCl during precipitation process was comprehensively investigated. Besides the inter-diffusion between the solvent and nonsolvent, the ultrasonic cavitation was thought to have significant influences on phase inversion and the resultant membrane morphology. The mutual diffusion between water and solvent during the ultrasound assisted phase inversion process was measured. The crystalline structure was detected by wide angle X-ray diffractometer (WAXD). The thermal behavior was studied by differential scanning calorimeter (DSC). The mechanical strength, forward and reverse water flux, rejection to bovine serum albumin (BSA) and pepsin were also investigated. By the ultrasound assisted phase inversion method, ultra-filtration membrane was successfully prepared, which exhibited more preferable morphology, better mechanical property and more favorable permeability without sacrificing the rejection and thermal stability.
研究领域:
材料科学
·
环境工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 15
·11104-11115
·
IF 2.993
Wei Chenjie,Cheng Qi,Lin Ligang,He Zhifu,Huang Kai,Ma Sisi,Chen Li
A novel one-step strategy is proposed for the recyclable polyimide nanofiltration (PI-NF) membranes. By designing the chain structure, the soluble polyimide polymer with coexisted imide rings and flexible pendant groups are fabricated. With the polyimide polymer as matrix, the NF membranes with integrally skinned asymmetric architecture were obtained by a phase inversion method. The structure evolution was demonstrated by scanning electron microscope and atomic force microscope analyses. The rejections of prepared PI-NF membrane for Rose Bengal, PEG 1000 and typical salts under optimized conditions were 92, 91.78, 98.68%, respectively. The rejections of NF membranes for different salts followed the order: Na 2 SO 4 > MgSO 4 > NaCl > MgCl 2 . Furthermore, the fabricated polyimide-based NF membranes show a stable performance during long-time filtration process and exhibit a confirmed excellent recyclable property.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 6
·1-11
·
IF 23.2
Wei Renbo,Huo Qi,Liu Kexin,Elnaggar Ashraf Y.,El-Bahy Salah M.,El-Bahy Zeinhom M.,Ren Juanna,Wang Lingling,Wu Zijian
With the burgeoning application of diverse electronic equipment in daily life and national defense, the requirements for electromagnetic interference shielding effectiveness (EMISE) are constantly increasing. The precise adjustment of pore structure and the controllable distribution of conductive fillers in pores have become key challenges in optimizing EMISE of porous materials. Herein, we fabricated fluorinated carbon nanotube (FCNT) and polyarylene ether nitrile (PEN) FCNT/PEN composites with advanced EMISE by precisely controlling the pore structure of PEN porous films via delayed phase conversion (DPC) method and distributing FCNT on the obtained pore walls. Dispersion and electronegativity of carbon nanotube are firstly modified by fluorination treatment, offering FCNT. The pore structures of PEN porous films with enriched FCNT on their pore walls are adjusted by changing constitution of coagulation bath and amount of porogen PVP K30. Benefiting from the separated pore structure and continuous conducting network of FCNT inside the pore, these porous films exhibit up to 27.3 dB absorption dominated EMISE with a low conductivity of 0.06 S/m. Further continuous hot pressing on these porous films results in thinner and denser films whose specific EMISE reaches an astonishing value of 6794.9 dB/cm. This in situ self-assembly of FCNT during the DPC process achieving the directional distribution of fillers in the prepared porous films initiates a novel approach for fabricating materials with advanced EMISE.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yamin Li,lifang Lin,Shengwei Sun,Nana Li,Zhibin Liang
Calcium alginate hydrogel/polyethersulfone (CaAlg/PES) hybrid membranes were synthesized via combining in situ ion crosslinking with phase conversion method. Once the Sodium alginate (NaAlg) uniformly dispersed in the casting solution contacted with Ca 2+ dissolved in coagulation bath solution in the phase conversion membrane formation process, nanoscale CaAlg hydrogel was in situ formed through ion exchange and evenly dispersed in the membrane matrix. FT-IR and XPS were adopted to confirm the formation of CaAlg hydrogel distributed in PES membrane matrix. SEM, AFM, BET analysis and contact Angle analyzer were all used to characterize the surface changes of morphology, roughness and hydrophilicity in detail. Specific separation performance was also evaluated and compared by cross-flow ultrafiltration tests. Comprehensive analysis of the measured properties of all obtained membranes, when the content of NaAlg was 1.5 wt%, the CaAlg/PES hydrogel membrane M 32 had the most excellent performance. The pure water flux increased from 1967 to 2193 L/m 2 hMPa, rejection rate of BSA was up to 99.87 %, and RFR value was almost 76.83 % after 4 cycles BSA filtration. XPS characterization of the membrane after filtration for 72 hours showed that the retention rate of Ca (2 P) reached 95 %, which further proved the stability of the membrane operation.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Dongqing Liu,Zexian Zhu,Yiping Zhao,Yingbo Chen,Yankun Tan,Yufeng Zhang
A co-polymer (SPAA6) of 5-sulfoanthranilic acid (5SAA) and ε -caprolactam was used to prepare membrane through nonsolvent induced phase separation (NIPS) method. The micro-structure of membrane was adjusted by small molecules to improve mechanic strength and performance, involving 7 commercial ionic surfactant and a self-synthesized one, S20. S20 showed the best compatibility with SPAA6, which converted spherical phase into network of strip-like units in micro-structure of membrane. Meanwhile, average pore size of the membrane was narrowed from 4.271 nm to 3.391 nm, tested by BET method. Tensile strength of membrane was improved from 2.5 MPa to 2.9 MPa. Therefore, anionic dyes rejection and membrane stability were both improved. It actually demonstrated that molecular weight distribution of SPAA6 was crucial for micro-structure construction of membrane since S20 was the SPAA6 of low molecular weight . In blend solution filtration test, membrane MS2 (1:2 for S20:SPAA6) displayed 98.22% rejection to Congo Red (CR) acid and 96.18% NaCl permeation under 1 bar. It showed 80.18% rejection to chrome blue K (ABK) and 96.28% NaCl permeation. Both water permeance were higher than 3.5 L·m −2 ·h −1 ·bar. Membrane MS2 showed the potential of fractionation of dye and NaCl, which was promising in textile waste water treatment .
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Rongrong Qiang,ChenJie Wei,Ligang Lin,Xuesong Deng,Tiantian Zheng,Qi Wang,Yixin Gao,Yuzhong Zhang
Nowadays, the separation efficiency and stability of nanofiltration (NF) membrane are of widespread concern. Inspired by the biomineralization phenomenon and its unique structure with siliceous framework, a polyimide (PI) NF membrane decorated with “silica hard phase-polymer soft phase” 3D interwoven sponge bionic structure was fabricated via a simple and effective one-step phase inversion strategy. The obtained membranes demonstrated high pure water permeability of 65 L/(m 2 ·h) and rejections of Na 2 SO 4 (91.55%) and NaCl (30.21%) at 0.4 MPa, respectively. Moreover, siliceous sponge-like structures were determined by SEM analysis, with the degree of cross-linking after membrane pore regulated as high as 88.89%. The integrity and long-term stability of the membrane in different organic solvents, including methanol, cyclohexane, acetone, ethyl acetate, n -heptane, absolute ethanol and toluene were maintained for 72 h at 0.8 MPa. Furthermore, the PI/SiO 2 membrane with siliceous sponge biologically unique structure gives rise to a scope of bioinspired membranes and shows promising prospect for the treatment of solutions in extreme environments.
研究领域:
材料科学
·
环境工程
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 32
·期 9
·095403
·
IF 3.551
Yingqi Heng,Tianqi Xie,Xiyang Wang,Ding Chen,Jiahao Wen,Xiyong Chen,Dongying Hu,Nannan Wang,Yimin A Wu
The development of a biodegradable cellulose-based separator with excellent performance has been of great research significance and application potential for the green development of supercapacitors. Herein, the regenerated porous cellulose/Polyvinyl alcohol films (CP-10, CP-15, CP-20, CP-25) with different mass ratio were successfully fabricated by a simple blending and phase inversion process. Their electrochemical properties as separators in assembled supercapacitor were evaluated. Fourier transform infrared spectroscopy and x-ray diffraction analysis indicate that intermolecular and intramolecular hydrogen bonding existed between cellulose and polyvinyl alcohol of the CP films. Compared with other CP films, the CP-20 film shows higher mechanical strength (28.02 MPa), better wettability (79.06°), higher porosity (59.69%) and electrolyte uptake (281.26 wt%). These properties of CP-20 are expected to show better electrochemical performance as separator. Indeed, the electrochemical tests, including electrochemical impedance spectroscopy, cyclic voltammetry, galvanostatic charge discharge, demonstrate that the SC-20 capacitor (with CP-20 as separator) shows the lowest equivalent series resistance of 0.57 Ω, the highest areal capacitance of 1.98 F cm−2 at 10 mV s−1, specific capacitance of 134.41 F g−1 and charge-discharge efficiency of 98.62% at 1 A g−1 among the four capacitors with CP films as separators. Comparing the assembled SC-40 and SC-30 with two commercial separators (TF4040 and MPF30AC) and SC-PVA with Polyvinyl alcohol (PVA) separator, the CV and GCD curves of SC-20 maintain the quasi rectangular and symmetrical triangular profiles respectively at different scan rates in potential window of 0–1 V. SC-20 exhibits the highest value of 28.24 Wh kg−1 at 0.5 A g−1 with a power density of 0.26 kW kg−1, and 13.41 Wh kg−1 at 10 A g−1 with a power density of 6.04 kW kg−1. SC-20 also shows the lowest voltage drop and the highest areal and specific capacitance. Moreover, SC-20 maintains the highest value of 86.81% after 4000 cycles compared to 21.18% of SC-40, 75.07% of SC-30, and 6.66% of SC-PVA, showing a superior rate capability of a supercapacitor. These results indicate that CP films can be served as promising separators for supercapacitors.
研究领域:
材料科学
·
能源技术
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 7
·2937-2948
·
IF 3.5
Songwei Li,Shengli Pang,Xinye Qian,Lina Jin,Xiangqian Shen
The commercial application of lithium–sulfur (Li–S) batteries is limited by the inherent defects of poor conductivity of sulfur and the shuttling effect of polysulfides. To overcome these limitations, a modified layer comprising a porous network PVDF-PMMA skeleton and Ketjen black (KB) carbon nanoparticles was coated on the polyethylene (PE) separator using the phase inversion method. The PVDF-PMMA-KB (PPK) composite layer with a structure abundant in mesopores can effectively limit the shuttling effect of polysulfides via a physical barrier and adsorption. Moreover, the utilization of active substances substantially increased as the KB carbon nanoparticles could provide additional reaction sites for activating inactive polysulfides and depositing lithium sulfide. The electrochemical properties of the Li–S battery were considerably enhanced using the modified separator with a PPK layer, which was reflected in the higher rate capability and longer cycling life. The cell with a modified separator delivered a specific capacity of 723 mA h g−1 at 1 C, and the capacity retention reached 73.3% after 400 cycles with a low decay rate of 0.223% per cycle. This work provides a novel preparation method for a modified layer on the separator and promotes the large-scale application of Li–S batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Ze Kun Sun,Yuxin Zhou,Yang Jiao,Xi Quan Cheng,Yingjie Zhang,Peng Wang,Heng Liang,Xiaobin Yang,Enrico Drioli,Alberto Figoli,Jun Ma,Lu Shao
Membrane technology is believed as a cost-effective approach for solving the water issues, where as it suffers from serious membrane fouling . Surface grafting and surface coating have been proved to be effective in abating the membrane fouling; however, these processes always need additional procedures and compromise the initial permeance of the membranes. Herein, we developed a kind of highly permeable polyacrylonitrile (PAN) membranes with excellent anti-fouling performance through one-step phase inversion of the PAN casting solution containing water-soluble active additives. During the process, the water-soluble active additives could segregate towards the membrane surface and pore walls; thereby finely tailoring the pore structures of the PAN-based membranes. Moreover, the active additives could react with each other to form crosslinked networks containing multi-hydrophilic functional groups including CH 2 –O–CH 2 , –OH or -Si-OH. Consequently, the PAN-based membranes exhibited surprising superhydrophilicity with water contact angle below 10° even after soaking in water for one week and the anti-fouling permeance of the membranes increased significantly with permeance recovery rate above 93%. Interestingly, the modified membranes also demonstrated both high permeances and high separation efficiency, thereby showing strong promise in water environmental remediation including wastewater treatment and oil/water emulsion separation.
研究领域:
环境科学
·
材料科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 10
·2032-2039
·
IF 5.344
Pei Liu,Hongyao Du,Yu Chen,Hua Wang,Jinzhu Mao,Lianbin Zhang,Juan Tao,Jintao Zhu
Porous polymer microneedles (MNs) have great potential in transdermal medical applications due to their three-dimensional (3D) porous structures and high porosity. However, existing approaches for the fabrication of such porous polymer MNs are complicated and only applicable to limited types of polymers. Here, we describe a facile yet effective phase inversion route to prepare polymer MNs with highly porous and interconnected pore structures. The fabrication process is simple and mild without involving high temperatures or irradiation, and can be applied to a broad spectrum of commonly used polymers (e.g., cellulose acetate (CA), polysulfone (PSF), polyethersulfone (PES), polylactic acid (PLA), etc.). Thanks to the capillary effect and large cavity given by highly porous and interconnected structures, the resulting porous polymer MNs show the capability of rapidly extracting dermal interstitial fluid (ISF) and efficiently loading/releasing drug compounds. As a proof of concept, we demonstrate the use of these porous CA MNs in the highly efficient extraction of ISF for glucose level detection and administration of insulin for hyperglycemia. Given the recent trend of painless techniques in diagnosis and treatment, the current study provides a new opportunity for the fabrication of MN-based devices for transdermal ISF extraction and drug delivery.
研究领域:
生物医学工程
·
材料科学
·
药物递送系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 28
·e00259
·
IF 2
Bo Yang,Hai Xing,Yang Xia,Xin Wang,Ningning Liu
Graphical ZIF-8 was synthesized through an in-situ growth method within a PVDF membrane matrix. The PVDF/ZIF-8 composite membrane was subsequently prepared via the phase inversion method using immersion precipitation. The ZIF-8 particles were uniformly distributed in the PVDF/ZIF-8 composite membrane. The widespread use of organic dyes in industrial processes has led to increasing environmental pollution due to the discharge of dye-contaminated wastewater, necessitating more efficient dye removal methods. In this study, a poly(vinylidene fluoride) (PVDF)/ZIF-8 composite membrane was fabricated via a phase inversion method using immersion precipitation, with ZIF-8 synthesized via in-situ growth within the membrane matrix. The composite membranes were thoroughly characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and thermogravimetric analysis (TGA). The ZIF-8 particles were uniformly distributed in the PVDF/ZIF-8 composite membrane. The adsorption performance of the PVDF/ZIF-8 composite membrane was evaluated for methyl green (MG) removal. At 313 K with an adsorbent dose of 10 mg, the membrane exhibited an adsorption capacity of 172.30 mg g⁻¹ and a removal ratio of 87.21%, demonstrating that the incorporation of ZIF-8 significantly enhanced adsorption performance. Adsorption isotherm studies revealed that the process followed the Freundlich model, while kinetic analysis indicated a pseudo-second-order mechanism. Additionally, thermodynamic investigations suggested that the adsorption was endothermic and spontaneous. The major driving force for adsorption was identified as electrostatic interactions between the dye and the membrane. These findings highlight the potential of PVDF/ZIF-8 composite membranes for effective dye removal from wastewater.
研究领域:
环境科学
·
材料工程
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2019
·Vol. 12
·期 17
·2813
·
IF 2.972
Haijuan Li,Ling Li,Shuaizhi Zheng,Xinming Wang,Zengsheng Ma
To improve the thermal shrinkage and ionic conductivity of the separator for lithium-ion batteries, adding carboxylic titanium dioxide nanofiber materials into the matrix is proposed as an effective strategy. In this regard, a poly(vinylidene fluoride-hexafluoro propylene)/dibutyl phthalate/carboxylic titanium dioxide (PVDF-HFP/DBP/C-TiO2) composite separator is prepared with the phase inversion method. When the content of TiO2nanofibers reaches 5%, the electrochemical performance of the battery and ion conductivity of the separator are optimal. The PVDF-HFP/DBP/C-TiO2(5%) composite separator shows about 55.5% of porosity and 277.9% of electrolyte uptake. The PVDF-HFP/DBP/C-TiO2(5%) composite separator has a superior ionic conductivity of 1.26 × 10−3S cm−1and lower interface impedance at room temperature, which brings about better cycle and rate performance. In addition, the cell assembled with a PVDF-HFP/DBP/C-TiO2separator can be charged or discharged normally and has an outstanding discharge capacity of about 150 mAh g−1at 110 °C. The battery assembled with the PVDF-HFP/DBP/C-TiO2composite separator exhibits excellent electrochemical performance under high and room temperature environments.Keywords:TiO2nanofiber;PVDF-HFP;composite separator;phase inversion;thermal shrinkage;ionic conductivity
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）