Scientific Reports
·
2023
·Vol. 13
·期 1
·1-10
·
IF 4.6
Pang Honglei,Qiu Yayu,Sheng Weipeng
Hybrid polyvinylidene fluoride-silica-hexadecyltrimethoxysilane (PVDF-SiO 2 -HDTMS) membranes were fabricated via a non-solvent-induced phase-inversion method to create stable hollow-fiber membranes for use in the membrane contact absorption of carbon dioxide (CO 2 ). The surface properties, performance characteristics, and long-term performance stability of the prepared membranes were compared and analyzed. The outer surfaces of the prepared membranes were superhydrophobic because of the formation of rough nanoscale microstructures on the surfaces and their low surface free energy. The addition of inorganic nanoparticles improved the mechanical strength of the PVDF-SiO 2 -HDTMS. Long-term stable operation experiments were carried out with a mixed inlet gas (CO 2 /N 2 = 19/81, v/v) at a flow rate of 20 mL/min. The absorbent liquid in these experiments was 1 mol/L diethanolamine (DEA) at a flow rate of 50 mL/min. The mass transfer flux of CO 2 through the PVDF-SiO 2 -HDTMS membrane decreased from an initial value of 2.39 × 10 –3 mol/m 2 s to 2.31 × 10 –3 mol/m 2 s, a decrease of 3% after 20 days. The addition of highly stable and hydrophobic inorganic nanoparticles prevented pore wetting and structural damage to the membrane. The PVDF-SiO 2 -HDTMS membrane was found to have excellent long-term stable performance in absorbing CO 2 .
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Membranes
·
2021
·Vol. 11
·期 11
·803
·
IF 4.106
Qianqian Xu,Yuchao Chen,Tonghu Xiao,Xing Yang
The use of poly(vinylidene fluoride) (PVDF) microfiltration (MF) membranes to purify oily water has received much attention. However, it is challenging to obtain high-performance PVDF microfiltration membranes due to severe surface fouling and rapid decline of permeability. This study explored a new approach to fabricate high-performance PVDF/silica (SiO2) composite membrane via the use of a polymer solution featuring lower critical solution temperature (LCST) characteristics and the non-solvent thermally induced phase separation method (NTIPS). Coupling with morphological observations, the membrane formation kinetics were analyzed in depth to understand the synergistic effect between the LCST solution properties and fabrication conditions in NTIPS. Utilizing such a synergistic effect, the transition from finger-like macrovoid pores to bi-continuous highly connected pores could be flexibly tuned by increasing the PVDF concentration and the weight ratio of SiO2/PVDF in the dope solution and by raising the coagulation temperature to above the LCST of the solution. The filtration experiments with surfactant-stabilized oil-water emulsion showed that the permeation flux of the PVDF/SiO2composite membranes was higher than 318 L·m−2·h−1·bar−1and the rejection above 99.2%. It was also shown that the PVDF/SiO2composite membranes, especially those fabricated above the LCST, demonstrated better hydrophilicity, which resulted in significant enhancement in the anti-fouling properties for oil/water emulsion separation. Compared to the benchmark pure PVDF membrane in oily water purification, the optimal composite membrane T70 was demonstrated via the 3-cycle filtration experiments with a significantly improved flux recovery ratio (Frr) and minimal reduced irreversible fouling (Rir). Overall, with the developed method in this work, facile procedure to tune the membrane morphology and pore structure was demonstrated, resulting in high performance composite membranes suitable for oil/water emulsion separation.Keywords:PVDF/SiO2composite membrane;lower critical solution temperature (LCST);nonsolvent thermally induced phase separation (NTIPS);structural control;oil-in-water emulsion
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2024
·
IF 13
Jiahui Lin,Jintao Huang,Zhanhu Guo,Ben Bin Xu,Yan Cao,Juanna Ren,Hua Hou,Yongshuang Xiao,Mustafa Elashiry,Zeinhom M. El-Bahy,Yonggang Min
With the rapid development of electronic industry, it's pressing to develop multifunctional electromagnetic interference (EMI) shielding materials to ensure the stable operation of electronic devices. Herein, multilayered flexible PEG@PAN/MXene (Ti 3 C 2 T x )/PVDF@SiO 2 (PMF) composite film has been constructed from the level of microstructure design via coaxial electrospinning, coating spraying, and uniaxial electrospinning strategies. Benefiting from the effective encapsulation for PEG and high conductivity of MXene coating, PEG@PAN/MXene composite film with MXene coating loading density of 0.70 mg cm −2 exhibits high thermal energy storage density of 120.77 J g −1 and great EMI shielding performance (EMI SE of 34.409 dB and SSE of 49.086 dB cm 3 g −1 ) in X-band (8–12 GHz). Therefore, this advanced composite film can not only help electronic devices prevent the influence of electromagnetic pollution in the X-band but also play an important role in electronic device thermal management. Additionally, the deposition of nano PVDF@SiO 2 fibers (289 ± 128 nm) endowed the PMF composite film with great hydrophobic properties (water contact angle of 126.5°) to ensure the stable working of hydrophilic MXene coating, thereby breaks the limitation of humid application environments. The finding paves a new way for the development of novel multifunctional EMI shielding composite films for electronic devices.
研究领域:
材料科学
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电气工程
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纳米技术
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高分子科学
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热工程
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电磁兼容
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Jian Lan,Hongying Hou,Xiaohua Yu,Ju Rong,Fangshu Chen
Poor solid–solid interfacial compatibility has been a troubling challenge to the development of solid-state lithium metal batteries . For this purpose, inspired by mussel mimetic chemistry, the homogeneous ionic interfaces and channels between PVDF matrix and SiO 2 nanospheres were built by grafting sulfonate betaine (SB) on their surfaces via Schiff base reaction and ring opening reaction. Furthermore, the influence of SB-SiO 2 content on the structure, mechanical properties , thermal stability and electrochemical performances of the composite solid-state electrolyte was also studied. Desirably, Li + transference number and ionic conductivity of 8%SB-SiO 2 /SB-PVDF/LiTFSI electrolyte membrane were as high as 0.50 and 5.5 × 10 −5 S/cm, respectively, much higher than those of the counterparts in literatures. Uniform dispersion of SB-SiO 2 nanospheres in 8%SB-SiO 2 /SB-PVDF/LiTFSI electrolyte membrane built the homogeneous continuous ion channels, while the homogeneous structure of SB-PVDF and PVDF binder in the electrode also facilitated the interface compatibility of the membrane/electrode, and thus the synergistic effect improved the Li + transference number. The reversible specific capacity of LiFePO 4 // 8%SB-SiO 2 / SB-PVDF / LiTFSI // Li battery was 129.7 mAh/g at 1.0 C for 200 cycles, higher than those of other two electrolyte membranes, meanwhile, high-voltage LCO//8%SB-SiO 2 /SB-PVDF/LiTFSI//Li battery also exhibited good Li-storage performance, indicating high feasibility of 8%SB-SiO 2 /SB-PVDF/LiTFSI electrolyte membrane in solid-state lithium metal batteries .
研究领域:
材料科学
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电化学
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电池技术
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固态电解质
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2018
·
IF 3.306
Li-Zhi Zhang,Qian-Wen Su
Membranes of low thermal conductivity (thermal insulation) but high moisture permeability are highly desired in membrane-based humidification-dehumidification (MHDD) seawater desalination technology. The porous membranes with thermal insulation could decrease the heat losses in humidification, thus the system energy performance can be improved. To satisfy this purpose, in this study, a PVDF/SiO 2 (Si aerogel) composite bilayer membrane of low heat conductivity is prepared and analyzed. To solve the problem of cracking in forming SiO 2 layer, the casting solution (TEOS, H 2 O) is doped with a drying control chemical additive (DCCA) N, N -dimethylformamide (DMF) to decrease the surface tensions in the gel. Then performance analysis of the developed membranes are conducted and the membranes are characterized. The results found that the heat conductivity is decreased from 0.08199 W m −1 K −1 to 0.04487 W m −1 K −1 , with a penalty of effective moisture diffusivity sacrificed from 4.93 × 10 −6 m 2 /s to 2.42 × 10 −6 m 2 /s. They are superior to the available SiO 2 blend insulation membranes. Further, the membranes can be optimized by facile structural manipulations such as adjusting the SiO 2 layer thickness to realize the desired performance while balancing the paradox between the permeability and heat conductivity. This is the first time that heat conductivity of membranes can be manipulated for seawater desalination.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 1
·59
·
IF 2.935
Wenqiang Wang,Xi Chen,Chu Zhao,Bowu Zhao,Hualin Dong,Shengkui Ma,Liying Li,Li Chen,Bin Zhang
A blend of Polyvinylidene Fluoride (PVDF) and SiO2microspheres inN,N-Dimethylformamide (DMF) underwent phase inversion to form a PVDF/SiO2membrane with SiO2microspheres in the membrane’s pores. Subsequently, the SiO2microspheres have been used as platforms for in site Ag nanoparticles (NPs) synthesis, forming a composite membrane. Benefitting from the full exposure of Ag NPs to the reactants, the composite membrane shows high catalytic reactivity when catalyzing the reduction ofp-nitrophenol under a cross-flow. The catalytic reaction follows the first-order kinetics, and the reaction rate increases with an increase in the amount of Ag NPs in the membrane, the reaction temperature, and the operating pressure. What is more, highly purified products can be produced and separated from the reactants in a timely manner by using the composite membrane.Keywords:Ag nanoparticles;catalysis;composite membrane;separation;SiO2microspheres
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Chuanxin Yang,Ronghui Han,Xiaoyu Guo,Shufen Zhang,Bingtao Tang,Yuang Zhang
Passive radiative cooling technology has received extensive attention as an environmentally friendly cooling solution. However, existing radiative coolers often suffer from complexities in preparation and high costs, limiting their practical applications. Here, a novel porous structure with randomly distributed microspheres is fabricated in a low-cost and simple method known as solvent volatilization-induced phase separation, employing polyvinylidene fluoride (PVDF) and monodispersed SiO 2 microspheres. Utilizing the regulation of parameters such as the size of the pores and microspheres, controllable multi-scattering of light by the microstructures is achieved. The porous PVDF/SiO 2 film, with an average solar reflectance of 93.8% and an average atmospheric window emissivity of 0.958, is self-supporting and exhibits excellent flexibility and mechanical strength. When applied to closed and windowed models, the porous PVDF/SiO 2 film effectively lowers the internal temperatures by an average of 7.0 °C and 4.6 °C in summer, respectively, and by an average of 6.7 °C and 4.4 °C in spring. This work provides a viable strategy for achieving efficient radiative cooling and improving building energy management in a simple, cost-effective, and scalable manner.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 9
·e53573
·
IF 3.057
Hongying Hou,Baoxiang Huang,Xiaohua Yu,Jian Lan,Fangshu Chen
High thermal stability, mechanical property and electrochemical stability of polyvinylidene fluorid (PVDF) make it a promising solid electrolyte polymer matrix. However, it also faces some challenges such as low ionic conductivity, high crystallinity degree and the absence of reactive groups. Herein, PVDF powder was modified by chemical grafting amphiprotic sulfonate betaine (SB) for solid electrolyte (SB-PVDF) with high ionic conductivity and chemical stability. Furthermore, to improve the mechanical property and reduce the crystallinity degree of SB-PVDF, 3%, 6% and 9% SiO 2 nanospheres were also incorporated into SB-PVDF, and the resultant composite polymer solid electrolytes were marked as 3% SiO 2 /SB-PVDF, 6% SiO 2 /SB-PVDF, 9% SiO 2 /SB-PVDF. The results showed that 6% SiO 2 /SB-PVDF membrane exhibited the best overall performances, possibly due to the synergistic effect of amphiprotic SB modification and uniform dispersion of SiO 2 filler in PVDF matrix. For example, the solid-state battery Li//6%SiO 2 /SB-PVDF//LiFePO 4 delivered the initial discharge capacity of 153.0 mAh/g at 0.2 C and the reversible discharge capacity of 124.4 mAh/g at 1.0 C with the capacity retention rate of 93.8%, indicating high feasibility for solid-state lithium ion battery.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Zhong-Kun Li,Wan-Zhong Lang,Wei Miao,Xi Yan,Ya-Jun Guo
Graphene oxide (GO), one of the most promising filter materials, is intensively employed to prepare the membranes via non-solvent induced phase separation(NIPS) method, but it has not been found to modify polymeric membranes via thermally induced phase separation (TIPS) method. In this work, the derivative of GO, SiO 2 @GO nanohybrid , is fabricated and employed to synthesize PVDF/SiO 2 @GO nanohybrid membranes via TIPS method for the first time. The results indicate that the PVDF/SiO 2 @GO nanohybrid membranes experience liquid-liquid phase separation mechanism, and exhibit bi-continual and asymmetric structure. The included SiO 2 @GO nanohybrid is uniformly dispersed in the membrane matrix. With the addition of SiO 2 @GO, the top surface becomes denser and the pore size decreases; but overhigh SiO 2 @GO addition for membrane M-5 triggers in the adverse trend. This is caused by the combined actions of nucleation and growth of PVDF and viscosity increase of cast solution due to the addition SiO 2 @GO nanohybrid. The BSA rejection of membrane gradually increases with the addition of PVDF/SiO 2 @GO nanohybrid accompanied with the decline of pure water permeation flux. As the SiO 2 @GO content increases to 0.9 wt%, the PVDF/SiO 2 @GO nanohybrid membrane M-4 presents the highest BSA rejection of 91.7% and the lowest permeation flux of 182.6 L m −2 h −1 bar −1 . However, the overhigh SiO 2 @GO addition (1.2 wt%) leads to the outstanding pure water permeation flux of 679.1 L m −2 h −1 bar −1 and a much lower BSA rejection. The addition of PVDF/SiO 2 @GO nanohybrid evidently improves the surface hydrophilicity and antifouling ability of resultant membranes. The XRD patterns and FTIR spectra of membranes verify the exclusive α-phase of PVDF, and the melting temperature( T m ) and crystallinity( x c ) evidently increase with the addition of SiO 2 @GO nanohybrid up to 0.9 wt% in the dopes. Overhigh SiO 2 @GO addition (1.2 wt%) leads to small decline for these parameters.
研究领域:
材料科学
·
膜技术
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
Green Chemical Engineering
·
2020
·
IF 0
Qingping Xin,Kaiqiang Xie,Qingqing Liang,Xu Li,Yinan Zeng,Yuhang Zhao,Lei Zhang,Shaofei Wang,Hong Li,Yuzhong Zhang
In membrane contactors, maintaining a high SO 2 absorption flux and an excellent wetting resistance are crucial for hazardous gas removal. In this study, we adopted an electrospinning strategy to fabricate highly robust superhydrophobic dual-layer Elec-PVDF/SiO 2 composite membrane contactors used for flue gas desulfurization. The composite membrane contactor consisted of a durable and ultrathin three-dimensional (3D) superhydrophobic surface and a porous supporting layer, where the formulation was optimized by regulating the PVDF concentration, solvent ratio and SiO 2 particles content in electrospinning solution. The scanning electronic microscopy (SEM), EDS-mapping, water contact angle (WCA) and surface roughness of as-prepared Elec-PVDF/SiO 2 composite membrane contactors were conducted to explore the physical and chemical structure. The SiO 2 nanoparticles were uniformly loaded in Elec-PVDF/SiO 2 composite membrane contactor, and constructed micro-nano dual-coarse lotus-leaf-like morphology, which noticeably elevated surface roughness ( R a ). The SiO 2 nanoparticles also functioned as hydrophobic modifiers, which boosted the WAC up to 155°. The SO 2 absorption fluxes and SO 2 removal efficiencies were investigated. In particular, the membrane contactor doped with 20 wt% SiO 2 nanoparticles significantly elevated the stability of desulfurization performance. Besides, the membrane mass transfer coefficient ( K m ) and corresponding membrane mass transfer resistance ( H / K m ) were explored.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
LANGMUIR
·
2025
·
IF 3.9
Ran Yu,Liying Pu,Xiaofang Wang,Peng Liu,Xiang Shen
The eco-friendly nature and energy efficiency of polymeric membranes have established them as pivotal materials for oil-in-water emulsion separation. However, persistent membrane fouling caused by oil deposition remains a major challenge, significantly hindering their practical implementation in industrial settings. In this work, thiol–ene photochemistry was employed to synthesize PEGylated silica nanoparticles (SiO2-g-PEGDA) using poly(ethylene glycol) diacrylate (PEGDA) and hexanedithiol (HD) as monomers. Biomimetic PVDF membranes were engineered via vapor-induced phase separation (VIPS) by integrating SiO2-g-PEGDA nanoparticles, followed by secondary coagulation in a dopamine (DA) solution. The experimental results demonstrate that the biomimetic membranes exhibit a characteristic sponge-like cross-sectional morphology and well-defined rough surface microstructures, which are attributed to the synergistic roles of SiO2-g-PEGDA as nanofillers and DA as interfacial cross-linker during secondary phase separation. Energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) analyses confirm that the combined action of nanoparticles and PDA significantly increases the density of hydrophilic functional groups on membrane surfaces and within pore channels. The membranes exhibit excellent hydrophilicity and underwater superoleophobicity, achieving an outstanding emulsion flux of 3537 Lm–2 h–1 bar–1 and an oil removal efficiency of 98.5%. After 15 cycles of oil–water separation, the membranes maintain a high flux recovery rate of 85.6%. Moreover, the biomimetic membranes possess exceptional operational stability, as evidenced by consistent surface wettability under organic solvents, strong acid and high-salinity conditions.
研究领域:
高分子科学
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膜技术
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材料科学
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化学工程
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环境工程
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表面化学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Cleaner Engineering and Technology
·
2021
·
IF 0
Huijuan Gong,Honglei Pang,Mengfan Du,Zezhi Chen
In order to obtain high performance polyvinylidene fluoride (PVDF) hollow fiber membrane for post combustion carbon dioxide (CO 2 ) capture from flue gas by membrane contact absorption technology, a novel mixed matrix membrane fabrication process was proposed in this study. The mixed matrix PVDF-SiO 2 (silicon dioxide)-HDTMS (hexadecyltrimethoxysilane) hollow fiber membranes fabricated via this process exhibit super-hydrophobicity on the outer surface and high mechanical strength. Among the membranes, the PVDF-SiO 2 (1.5)-HDTMS membrane exhibited the highest CO 2 absorption performance, which was due to its excellent properties. It had water and diethanolamine (DEA, 1 mol/L) contact angles of 159.3° and 157.5°, respectively. Tensile strength, elongation at break, and LEP W (liquid entry pressure of water) of it were 3.2 × 10 6 Pa, 35.0%, and 9.0 × 10 5 Pa, respectively. The CO 2 absorption flux of PVDF-SiO 2 (1.5)-HDTMS membrane attained 2.39 × 10 −3 mol‧m −2 ‧s −1 , which was 7.2% and 141.4% higher than that of the PVDF-HDTMS-1.5 and PVDF membranes, respectively. Moreover, CO 2 absorption flux of the PVDF-SiO 2 (1.5)-HDTMS membrane decreased only 3% after twenty days of continuous operation. Highlighted by the outstanding performance in membrane contact CO 2 absorption, the PVDF-SiO 2 (1.5)-HDTMS membrane shows great potential in the application of membrane contact absorption for post-combustion CO 2 capture.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
危险品化学品经营许可证（带存储）