SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Changqing Miao,Yujia Tong,Fiona Hammond Quarcoo,Xiaohui Ju,Weixing Li
Mussels in nature can adhere to the surface of hydrophobic substances by secreting adhesive substances, which has attracted wide attention by coating method for membrane modification. However, complicated processing procedures remain major problems. Here, we proposed a simple, mild and fast surface coating method. Proanthocyanidins (PC) react with 3-aminopropyl triethoxysilane (KH550) under the accelerated action of the oxidant ammonium persulfate (APS) at room temperature to form a polyphenol network. The hydrophilic network coating was constructed on PVDF membrane by surface co-deposition method for 1 h, which could effectively separate different emulsions. The water permeability of modified membrane was 18,271 L∙m −2 ∙h −1 ∙bar −1 . The permeability for separating isooctane-in-water emulsion arrived at 14,223 L∙m −2 ∙h −1 ∙bar −1 and the oil rejection rate was 99.6 %. After ten cycles, the separation flux was 10,836 L∙m −2 ∙h −1 ∙bar −1 with the rejection rate of 98.8 %. Modified membranes were soaked in acid and alkali salt solutions of different pH values for 30 days, and maintained good underwater oleophobic performance (>156°). The developed membrane showed excellent separation performance, oleophobic property and acid-base stability. The proposed membrane modification strategy was prospective for efficient separation of oily wastewater.
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EUROPEAN POLYMER JOURNAL
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2024
·
IF 5.8
Yinchao Jin,Hongyu Chen,Gongpu Wen,Jie Zhou,Zhaohui Wang,Feng Zhang,Zhaoliang Cui
The increased alkali resistance of PVDF membranes helps to extend membrane life and expand membrane applications in alkaline environments. In this paper, the amphiphilic copolymer hexafluorobutyl methacrylate (HFBMA) was grafted onto PVDF membranes via atom transfer radical polymerization (ATRP), and the corrosion resistance of PVDF-g-HFBMA in alkaline solutions was investigated. PVDF-g-HFBMA was prepared by one-step method, and the grafting rate was 29 %. PVDF membrane and PVDF-g-HFBMA membrane (PVDF-H) were prepared by NIPS. 19 F NMR and gel permeation liquid chromatography (GPC) results showed that HFBMA monomer was successfully grafted onto the main chain of PVDF by ATRP. The chemical compositions of PVDF membrane and PVDF-g-HFBMA membrane before and after alkali treatment were investigated by Fourier transform infrared spectrometer (FT-IR) and X-ray photoelectron spectroscopy (XPS). The membrane morphology was investigated by scanning electron microscopy (SEM). HFBMA replaced fluorine atoms and grafted onto PVDF, reducing the removal of HF groups and the formation of C C on the membrane surface. Following the alkali treatment, the whiteness of the PVDF membrane decreased by 95.62 %, and the elongation at break reduced by 56.66 %. The whiteness of the PVDF-g-HFBMA membrane decreased by 42.08 %, while the elongation only reduced by 2.88 %.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Yaru Wang,Jing Zhou,Jingying Xu,Hao Ye,Mengyao Zhao,Wanjing Li,Bin Yang,Xianglong Li
Poly(vinylidene fluoride) (PVDF) fibers have been widely investigated in the fields of electronics, filtration, and oil/water separation due to their exceptional piezoelectric/thermoelectric/ferroelectric properties, excellent chemical/thermal properties, and high mechanical properties. However, the application of PVDF micro/nanofibrous membrane in these fields is still limited due to the solvent toxicity of PVDF in the fiber preparation process. In this case, we developed an environmentally friendly strategy for producing pure PVDF micro/nanofibrous membranes. In detail, the centrifugally spun precursor PVDF/poly(ethylene oxide) (PEO) micro/nanofibrous membrane was obtained from a composite spinning solution composed of PVDF emulsion and PEO solution. Subsequently, the precursor micro/nanofibrous membranes were sintered at high temperature to decompose PEO and obtain pure PVDF micro/nanofibrous membrane. The results indicate that the pure PVDF fibrous membranes present nanostripe bumps on the surface. The height and number of nanostripe bumps can be easily controlled by the sintering temperature. Owing to the high surface roughness and low surface energy of the prepared PVDF fiber membranes, an excellent droplet rejection (above 155°) is produced. Moreover, PVDF micro/nanofibrous membranes have high flux (3837 L·m–2·h–1) and excellent water-in-oil separation efficiency (99.42%). This study describes a way to fabricate the pure PVDF micro/nanofibrous membranes and apply them to oil–water separation.
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JOURNAL OF ELECTRONIC MATERIALS
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2025
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IF 2.5
Zhang Yue,Zhu Bixuan,He Yu,Guo Jiacheng,He Ruiqi,Cai Chuanyezi,Ye Lu,Li Hongwei,Zhang Jianjun,Ma Sude
Polyvinylidene fluoride (PVDF) is one of the most widely studied polymers for the development of film capacitors with high energy density. However, it is still challenging to modulate the polarization hysteresis phenomenon of PVDF in a simple and effective way to achieve a significant increase in energy density. In this work, a low-loss amorphous polymer poly(methyl methacrylate) (PMMA) was introduced as a reinforcing phase to be blended with PVDF to form a matrix. The dielectric and energy storage performance of PVDF is improved by integrating the high dielectric property of barium titanate (BaTiO 3 ) with the low hysteresis property of PMMA. PMMA/PVDF-BaTiO 3 nanocomposites were prepared by spin-coating process. It was shown that the PMMA/PVDF-BaTiO 3 nanocomposites had a thin and flat macroscopic structure and a uniform and dense microstructure. The optimum dielectric constant of the nanocomposites was 12.9 at 100 Hz, and the optimum energy density was maximized to 6.5 J/cm 3 . Compared with the PVDF/PMMA composites, the dielectric and energy storage performance were significantly improved under the same conditions. This work provides a simple and effective strategy for obtaining polymer nanocomposites with high energy density and with potential as flexible dielectric substrates for film capacitors.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Bing Yang,Tingting Yu,Chenyu Yang,Weiwei Wu,Jizhou Jiang
In this work, composite films of molybdenum disulfide (MoS 2 ) with poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) were fabricated using aqueous phase transformation and hydrothermal methods, aiming at efficiently degrading tetracycline hydrochloride (TC). The findings revealed that the degradation efficiency of TC by MoS 2 @PVDF-HFP, when subjected to a combined photocatalysis process involving a simulated pressure electric field and aeration, reached a remarkable 96.11 % within 1 h-surpassing the performance observed under individual conditions. The changes in the electron density cloud on the films surface induced by the pressure electric field and the acceleration of electron transfer rate between contact interfaces were evident. Notably, the composite films exhibited a stable performance with a TC removal rate of 90.23 % after five cycles, including a relatively stable degree of mineralization. We employed Density Functional Theory (DFT) to investigate the changes in the state density of MoS 2 @PVDF-HFP under different conditions, such as compressive stress, tension, and no force. This further clarified the mechanism of piezoelectric coupling photocatalysis promoting induced charge transfer on the films surface. The research findings presented in this paper provide a promising avenue for the application of piezoelectric field-assisted photocatalysis in enhancing material performance.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lili Cao,Yuxiang Chen,Shane Feng,Yanli Su
To reduce the dielectric loss of MXene/PVDF composites near the percolation threshold, a MnO 2 /MXene hybrid structure was successfully synthesized via an ultrasonic-assisted solution process, and MnO 2 /MXene/PVDF composite films were prepared by a solution casting method. The effects of different amounts of MnO 2 nanorods on the microstructure, thermal stability, dielectric properties and mechanical properties of the composite films were investigated. At 1 kHz, the dielectric constant of 7 wt% MnO 2 /MXene/PVDF is 37.3, and the dielectric loss is as low as 0.05. The electric modulus curve, Nyquist curve and equivalent analog circuit of the composites revealed strong interface polarization and microcapacitance effects in the composites. In addition, the composite films exhibit excellent mechanical properties, and the storage modulus of the composite film loaded with 10 wt% MnO 2 is 1990.5 MPa, which is 3.44 times that of pure PVDF. This study confirms that incorporating MnO 2 nanorods into MXene/PVDF composites is an effective approach for fabricating high-performance dielectric composites.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2019
·Vol. 36
·期 2
·236-247
·
IF 2.476
Cui Yanhua,Yang Lili,Meng Minjia,Zhang Qi,Li Binrong,Wu Yilin,Zhang Yunlei,Lang Jihui,Li Chunxiang
A simplified strategy for facilely fabricating antifouling graphite carbon nitride/silver phosphate (g-C 3 N 4 /Ag 3 PO 4 ) nanocomposite photocatalytic polyvinylidene fluoride (PVDF) porous membranes was developed for effective removal of rhodamine B (RhB). g-C 3 N 4 /Ag 3 PO 4 heterojunction was strongly fixed to the interior of the PVDF membranes via phase inversion method. The membrane structure was analyzed by Fourier transform spectrophotometer (FT-IR). The morphology of the prepared membranes was investigated using scanning electron microscopy (SEM), EDX-mapping and atomic force microscopy (AFM), respectively. All prepared nanocomposite photocatalytic PVDF membranes exhibited a typically porous structure, and g-C 3 N 4 /Ag 3 PO 4 nanocomposites were well dispersed inside the membranes. The obtained g-C 3 N 4 /Ag 3 PO 4 heterojunction nanoparticle decorated PVDF membrane had a lower water contact angle of 79° and higher porosity of 85% than that of other two control membranes. The nanocomposite photocatalytic PVDF porous membranes had extremely high permeation flux over 1,083 L·m -2 ·h -1 , and could be used for the removal of RhB. The removal efficiency of g-C 3 N 4 /Ag 3 PO 4 -PVDF membranes towards RhB solution under visible light irradiation reached 97%, higher than that of the pure PVDF membranes (41%) and g-C 3 N 4 -PVDF membranes (85%). Remarkably, the flux performance and flux recovery ratio ( FRR ) of membranes revealed that the g-C 3 N 4 /Ag 3 PO 4 -PVDF membranes could recover high flux after fouling, which presented better fouling resistance. Furthermore, the fabricated antifouling g-C 3 N 4 /Ag 3 PO 4 nanocomposite photocatalytic PVDF porous membranes exhibited excellent recyclability. Therefore, it is expected that g-C 3 N 4 /Ag 3 PO 4 -PVDF membranes could provide an energy-saving strategy for effective removal of organic dyes wastewater and have a great potential for practical wastewater treatment in the future.
研究领域:
环境科学
·
材料科学
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Polymers
·
2024
·Vol. 16
·期 3
·416
·
IF 4.7
Tong Ji,Yuan Ji,Xiangli Meng,Qi Wang
Temperature-responsive separation membranes can significantly change their permeability and separation properties in response to changes in their surrounding temperature, improving efficiency and reducing membrane costs. This study focuses on the modification of polyvinylidene fluoride (PVDF) membranes with amphiphilic temperature-responsive copolymer and inorganic nanoparticles. We prepared an amphiphilic temperature-responsive copolymer in which the hydrophilic poly(N-isopropyl acrylamide) (PNIPAAm) was side-linked to a hydrophobic polyvinylidene fluoride (PVDF) skeleton. Subsequently, PVDF-g-PNIPAAm polymer and graphene oxide (GO) were blended with PVDF to prepare temperature-responsive separation membranes. The results showed that temperature-responsive polymers with different NIPAAm grafting ratios were successfully prepared by adjusting the material ratio of NIPAAm to PVDF. PVDF-g-PNIPAAm was blended with PVDF with different grafting ratios to obtain separate membranes with different temperature responses. GO and PVDF-g-PNIPAAm formed a relatively stable hydrogen bond network, which improved the internal structure and antifouling performance of the membrane without affecting the temperature response, thus extending the service life of the membrane.
研究领域:
材料科学
·
环境工程
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高影响因子
ACS Omega
·
2019
·
IF 2.584
Xueting Zhao,Ning Jia,Lijuan Cheng,Ruoxi Wang,Congjie Gao
The development of antifouling membranes plays a vital role in the widespread application of membrane technology, and the hybridization strategy has attracted a significant amount of attention for antifouling applications. In this work, TA/PEI@TiO2 hierarchical hybrid nanoparticles (TPTi HHNs) are first synthesized through a simple strategy combining the multiple catechol chemistries of phenolic tannic acid (TA) with the biomimetic mineralization chemistry of titania. The TPTi HHNs are used as nanofillers to prepare PVDF/TPTi hybrid membranes. The TPTi HHNs endow the membrane with higher porosity, hierarchical roughness, greater hydrophilicity, and underwater superoleophobicity. Upon TPTi HHN loading, the PVDF/TPTi hybrid membranes exhibit enhanced antifouling performance. The flux recovery ratio can reach 92% when utilized to separate oil-in-water emulsion. Even being applied to the three-cycle filtration of oil-in-water emulsion with much higher concentration, the PVDF/TPTi membrane can still maintain a high flux recovery ratio about 85%. This study will provide a facial polyphenol-based platform to fabricate antifouling hybrid nanofillers and antifouling hybrid membranes with promising applications in oil/water separation.
研究领域:
材料科学
·
环境工程
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WATER SCIENCE AND TECHNOLOGY
·
2024
·Vol. 90
·期 3
·777-790
·
IF 2.5
Zeng Guisheng,Gong Baichuan,Li Yingpeng,Wang Kun,Guan Qian
View large Download slide View large Download slide Close modal Superhydrophobic coatings with excellent self-cleaning performance have attracted significant concerns from researchers. Although various superhydrophobic coatings with prominent superhydrophobic properties have been fabricated, most developed coatings are still inadequate in pipeline scale inhibition applications. In this work, nano-silica (nano-SiO 2 ) was modified by silane coupling of vinyltriethoxysilane (VETS) and 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (PFTS) to prepare a superhydrophobic coating. Organosilicon of PFTS and VETS was grafted onto the surface of SiO 2 for preparing the superhydrophobic coating with low surface energy, and the superhydrophobic coating was cured via poly(vinylidene fluoride) (PVDF). The results showed that the contact angle of the prepared silica-based superhydrophobic coating, denoted as VETS-PFTS@SiO 2 /PVDF, is 159.2°, exhibiting outstanding superhydrophobicity performance. Furthermore, the superhydrophobicity coating also showed satisfactory durability performance in 200 g load wear test after 50 cycles. Importantly, the superhydrophobic coating displayed promising mechanical durability, chemical stability performance, as well as maintained excellent superhydrophobic properties after being placed in water for 3 weeks, indicating the potential for long-term utilization. In the simulated scale inhibition test, it was found that the synthesized coating can also significantly decrease the deposition rate of CaCO 3 and successfully enhance its scale inhibition performance . A self-cleaning VETS-PFTS@SiO 2 /PVDF coating with superhydrophobicity was prepared simply and environmentally. The superhydrophobic product exhibited a good durability and adaptability in air. Contact angle of water on the superhydrophobic surface is more than 155°. The prepared coating has potential application in scale inhibition of pipelines.
研究领域:
材料科学
·
表面化学
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Shiyu Chen,Xinyang Chen,Yingkang Tian,Changyong Zhao,Rongjin Lin,Yu Qiu,Hao Zhang,Xuejie Gao,Xuhui Sun
Lithium metal batteries are considered promising candidates for next-generation energy storage systems owing to the high theoretical capacity and low electrochemical potential of lithium metal. However, conventional liquid electrolytes face challenges such as dendrite formation and “dead lithium” accumulation, limiting performance and safety of lithium metal batteries. In this study, a high-interface-compatible polyvinylidene fluoride PVDF-based quasi-solid-state electrolyte (PVDF@PS) was prepared using a simple direct scraping method, incorporating a high-affinity polyacrylic acid (PAA) binder. Under in-situ pressure during battery encapsulation, high-purity silicon was lithiated to form a lithium-silicon alloy, reducing the nucleation and diffusion barriers of lithium. Concurrently, a small amount of lithium reacted with the silicon surface oxides, forming a stable passivation layer of Li 4 SiO 4 , significantly mitigating the risk of dendrite penetration that could cause short circuits. Additionally, the PAA binder was lithiated into a highly flexible Li-PAA structure. The combination of these three components forms an alloy protective layer, enhancing the electrolyte/electrode interface stability with both flexibility and robustness. This design effectively regulates the volume changes of the lithium anode during the dynamic plating/stripping process, promotes uniform lithium deposition, and suppresses dendrite formation. Furthermore, the protection layer reduces side reactions by isolating the lithium metal from direct interaction with the electrolyte. As a result, compared to uncoated PVDF-based quasi-solid-state electrolytes, PVDF@PS demonstrates excellent stability and a notably low overpotential (20 mV) in lithium symmetric cells at various current densities. In LiFePO 4 (LFP) full cells, it retains 80.3 mAh g −1 capacity after 1300 cycles, even under a high charge/discharge rate of 5C.
研究领域:
材料科学
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能源存储
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高影响因子
Current Nanoscience
·
2024
·Vol. 20
·期 4
·543-553
·
IF 1.4
Liu Yurong,Zeng Xiaolong,Zhu Lin,Wang Cong,Geng Kuiwei,Yao Ruohe
Background: The development of high-performance piezoelectric pressure sensors with outstanding sensitivity, good linearity, flexibility, durability, and biocompatibility is of great significance for smart robotics, human healthcare devices, smart sensors, and electronic skin. Thus,
considerable progress has been achieved in enhancing the piezoelectric property of PVDF-TrFEbased composite pressure sensors by adding various ZnO nanostructures in PVDF-TrFE polymer acting as a nucleating agent and dielectric material. Aims: In this work, flexible pressure sensors with
a sandwich structure based on PVDFTrFE/ nano-ZnO composite sensing film were fabricated using a simple spin-coating method and post-annealing process, while electrospinning and high-voltage polarization processes were not adopted. Methods: Poly (vinylidene fluoride-trifluoroethylene) (PVDF-TrFE)/nano-ZnO
composite films were prepared via spin coating to fabricate flexible piezoelectric pressure sensors. ZnO nanoparticles (ZnO NPs), tetrapod ZnO (T-ZnO) and ZnO nanorods (ZnO NRs) were used as nano-fillers for piezoelectric PVDF-TrFE, to enhance the beta-crystal ratio as well as the crystallinity
of PVDF-TrFE. The structural and surface morphologies of the composite films were investigated using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results: Among three different types of ZnO nanostructures with a concentration
range (0-7.5 wt%), the sensor with 0.75 wt% ZnO NRs nanofiller exhibits a maximum output voltage of 1.73 V under an external pressure of 3 N and a maximum sensitivity of 586.3 mV/N at the range of 0-3 N. Further, the sensor can generate a clear piezoelectric voltage under bending and twisting
deformation as well as compression and tensile deformation. Conclusion: To summarize, the addition of different concentrations of nano-ZnO can remarkably improve the piezoelectric performance of the composite sensor, and ZnO NRs can achieve better piezoelectric properties of the sensor
as compared to ZnO NPs and T-ZnO. In addition, the sensor with 0.75 wt% ZnO NRs as nanofiller has the highest piezoelectric response, which is about 2.4 times that of the pure PVDF-TrFE sensor. It is demonstrated that the sensor has great potential applications in wearable health monitoring
systems and mechanical stress measurement electronics.
研究领域:
材料科学
·
传感器技术
·
纳米技术
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高影响因子
危险品化学品经营许可证（带存储）