ACS Applied Bio Materials
·
2023
·
IF 4.7
Xian Ye,Yanan Li,Xiaoshuang Ma,Lin Gan,Jin Huang
Porous triboelectric polymer materials are widely used in portable sensors due to their lightweight and suitable mechanical performance, but their triboelectric properties need to be improved. Here, we propose a two-step strategy to concave the cell and cell-packing structure of triboelectric materials based on porous poly(vinylidene fluoride) (PVDF). The first step is to prepare triboelectric nanogenerators (TENGs) of PVDF with a concave cell-packing structure via oriented phase inversion. The second step is to concave the cells by radial and axial compression. The results reveal that the concavities in the cell structure at the radial direction and in the cell-packing structure at the axial direction improve the output signals of the porous PVDF TENG by ca. 150 and 110%, respectively. By contrast, the concaving in cell structure at the radial direction exerts a positive effect on triboelectric performance only when the radial compression strain is not bigger than 17.5%, especially when the cell wall is thin (ca. 0.85 μm). Meanwhile, the concavity-based strategy eliminates the irreversible deformation behavior of the porous PVDF material, enhancing its elasticity. The stability test shows that the sensor based on those materials is stable under 12,500 cycles, and the variance in the square derivation of output voltage is less than 1% during the cycle friction. Such stable and triboelectric-improved materials are assembled into sports-monitoring devices, providing an idea for the application of TENG in smart sensing.
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PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 19
·2011073
·
IF 18.808
Huiying Chen,Linlin Zhou,Zhi Fang,Shuize Wang,Tao Yang,Laipan Zhu,Xinmei Hou,Hailong Wang,Zhong Lin Wang
Inorganic lead halide perovskite has become an emerging material for modern photoelectric and electronic nanodevices due to its excellent optical and electronic properties. In view of its huge dielectric and electrical properties, inorganic CsPbBr 3 perovskite is introduced into the piezoelectric nanogenerator (PENG). Based on one-step electrospinning of solutions containing CsPbBr 3 precursors and polyvinylidene difluoride (PVDF), in situ growth of CsPbBr 3 nanocrystals in PVDF fibers (CsPbBr 3 @PVDF composite fibers) with highly uniform size and spatial distribution are synthesized. The CsPbBr 3 @PVDF composite fibers based PENG reveals an open-circuit voltage ( V oc ) of 103 V and a density of short-circuit current ( I sc ) of 170 µ A cm −2 , where the V oc is comparable to the state-of-the-art hybrid composite piezoelectric nanogenerators (PENGs) and the density of I sc is 4.86 times higher than that of lead halide perovskites counterpart ever reported. Moreover, CsPbBr 3 @PVDF composite fibers based PENG exhibits fundamentally improved thermal/water/acid–base stabilities. This study suggests that the CsPbBr 3 @PVDF composite fiber is a good candidate for fabricating high-performance PENGs, promising application potentials in mechanical energy harvesting and motion sensing technologies.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 5
·6249-6259
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IF 2.478
Han Yanxin,Shen Mingxia,Xu Yuanping,Yang Lu,Xue Yijiao,Tao Wenzhu
Owing to the large dielectric constant, ferroelectric poly(vinylidene fluoride) (PVDF) has emerged as an ideal potential component for dielectric capacitors with high energy density ( U e ). However, the intrinsic polarity of PVDF induces a large hysteresis loss, which dramatically reduces the discharged efficiency ( η ) and thus hinders its practical application. Herein, we demonstrate a simple modified polymer blending approach to enhance the η and meanwhile U e of PVDF through the employment of nonpolar polypropylene (PP). Despite the poor miscible nature of PVDF and PP, we realized the homogenous dispersion of PP within PVDF and their good interaction using a nonequilibrium manufacturing process. A minor addition of PP (< 15 wt%) demonstrated to be effective in depressing the hysteresis loss without degrading the polarization of PVDF, inducing superior η and U e . By further constructing a sandwich-structured for PP/PVDF blend composites, η and U e can be maximized to be 8.1 J/cm 3 and 75%, respectively.
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高影响因子
NANO
·
2021
·
IF 1.556
Yilin Wu,Yan Yan,Jian Lu,Zhixin Yu,Junda Wu,Qianqian Wang,Zhongyi Jiang
A new multifunctional KGM/PDA/PVDF composite membrane was successfully prepared via facile nonsolvent induced phase inversion method. Here, the KGM component consisted of numerous covalent bonds, which could improve the corrosion resistance of membrane materials. The dopamine, as a natural “glue” between PVDF substantial and KGM, is capable of integrating different materials together suitably. The as-prepared membrane possessed superior superhydrophilic/underwater superoleophobic property, great corrosion resistance and antifouling property. The separation efficiency was as high as 99.01%, and could stay relatively stable even in the acid, alkali or high salty environment. Additionally, the membrane had great regeneration performance and could keep stable after 15 cyclic separation, which was appropriate for efficient various oil–water separation process. Moreover, the composite membrane could also effectively separate dyes in different environments and the efficiencies were all more than 91%. All in all, the multifunctional composite membrane with facile preparation method might provide a promising strategy and significant theoretical basis for the efficient separation of oil–water emulsions and dyes.
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高影响因子
Nano Research
·
2021
·Vol. 14
·期 12
·4885-4893
·
IF 8.897
Chen Dongzhen,Zhang Liang,Ning Pan,Yuan Haozhi,Zhang Yu,Zhang Meng,Fu Tao,He Xinhai
Plasmonic surface of flexible multilayered nanofibers possesses special superiority for the surface-enhanced Raman scattering (SERS) sensing of molecules and microbial cells. However, the fabrication of flexible plasmonic nanofibers with high sensitivity and reproducibility is difficult. Herein, we report a smart strategy for fabricating flexible plasmonic fibers, in which compact and homogeneous gold nanoparticles (Au NPs) are in-situ grown on the high-curvature surface of multilayered fibers of electrospun polyvinylidene fluoride (PVDF). Firstly, the surface of PVDF fibers is changed electrically, and Au seeds are deposited on the surface of PVDF fibers using electrostatic driving force. Secondly, a stable AuI 4 − complex is formed employing coordination between I − and AuCl 4 − ions, which could decrease the reduction potential of AuCl 4 − and restrain the self-nucleation, and then the reduction reaction of AuI 4 − is initiated by introducing PVDF@Au seeds to pull down the barrier of potential energy. Finally, in-situ growth of AuNPs is generated on the high-curvature surface of PVDF nanofibers, and large-scale hotspots are generated by adjacent AuNPs coupling in the three-dimensional (3D) space of multilayered fibers. Membrane of PVDF@Au nanofibers also realizes the sensitive detection of thiram molecules (low limit of detection of 0.1 nM) and good reproducibility (relative standard deviation of 10.6%). Meanwhile, due to the multilayered construction of PVDF@Au nanofibers, a valid SERS signal on 3D surface of bacteria could be generated. 3D distribution of hotspots on multilayered PVDF@Au nanofibers gives a clear advantage for SERS sensing of organic molecules and microbial cells.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jiuyun Cui,Atian Xie,Zhuo Yan,Yongsheng Yan
Although a great deal of superhydrophilic/underwater superoleophobic membranes has been developing for oil-water emulsion separation, most of them could be destroyed or lose their underwater superoleophobicity after exposure to complex conditions. In this study, a crosslinking modified PVDF/GO membrane with acid, alkali and high salt resistance was successfully prepared by a simple crosslinking process between acrylic acid and ethylene glycol dimethacrylate (EGDMA). The influences of content of acrylic acid on the membrane performance and structure evolution were investigated. The resultant composite membrane showed superior underwater superoleophobicity even in acid, alkali and salt environments. Additionally, the composite membrane could effectively separate various surfactant-stabilize emulsions under gravity-driven via wettability capillary effect with high rejection (>99%) and flux (>145 L m −2 h −1 ). The composite membrane also exhibited outstanding recyclability because of the stable covalent bridged multiple networks structure. The antifouling performance, stability and impressive recyclability make the composite membrane a promising candidate for long-term oil-water emulsion treatment.
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高影响因子
IONICS
·
2021
·Vol. 27
·期 7
·2945-2953
·
IF 2.817
Gong Xiaodong,Luo Huan,Liu Gang,Luo Cong,Niu Yanhua,Li Guangxian
The gel polymer electrolytes (GPEs) with poly(acrylonitrile-polyhedral oligomeric silsesquioxane)/poly(vinylidene fluoride) (PAN-POSS/PVDF) blends as free-standing porous membrane and ionic liquid (IL) as absorption substance were successfully prepared. By tuning the content of PAN-POSS, the porosity and absorptivity of the blended membranes could be regulated. Due to the higher porosity and absorptivity, the ionic conductivity of GPEs with 15 wt% PAN-POSS reaches to 1.91 × 10 −3 S cm −1 at 20 o C. Meanwhile, the electrolytes also show excellent mechanical properties, thermal stability, and fire resistance. More importantly, the high electrochemical window of 4.6 V (vs. Li/Li + ) has been acquired and the testing cells with Li metal anode and LiFePO 4 cathode show a tolerable rate performance. Such prepared GPEs are expected to be applied to lithium batteries with high safety and electrochemical performance.
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高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2020
·
IF 4.872
Xiarong Zheng,Yuanqiong Liu,Xiaobin Liu,Qingbiao Li,Yanmei Zheng
A novel composite electrospun fiber with high photocatalytic efficiency, good stability, strong hydrophobicity, good pollution resistance, and easy separation and recovery was synthesized. The TiO 2 @g-C 3 N 4 (TCN) with special core-shell structure (5–10 nm shell) facilitated the separation of photogenerated electron-holes and had high photocatalytic performance. The poly (vinylidene fluoride) (PVDF) electrospun fiber immobilized with TCN was successfully fabricated (PVDF-TCN) with uniform distribution and size of nanofibers by using electrospinning, which was used for degrading tetracycline under visible-light irradiation (> 400 nm). A special rougher surface of electrospun fiber obtained by washing of sacrificial PVP increased the specific surface area, which became more conducive to the adhesion of the catalyst. The water contact angle and FTIR results demonstrated that the electrospun fiber became extremely hydrophilic after adding TCN catalyst, which could effectively mitigate the fiber pollution. The PVDF-TCN-0.2g electrospun fiber exhibited excellent photocatalytic performance and the degradation efficiency of tetracycline was up to 97% in 300 min under visible-light irradiation. The mechanism of PVDF-TCN electrospun fiber degradation of tetracycline in the photocatalytic process was also proposed. In addition, the PVDF-TCN-0.2g exhibited a stable activity after 4 cycles experiments since the degradation efficiency remained about 90%. Therefore, we believed this study provided a new strategy in catalyst immobilization and wastewater treatment.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Jiayun Zhu,Shouyong Zhou,Meisheng Li,Ailian Xue,Yijiang Zhao,Wenbo Peng,Weihong Xing
A novel PVDF mixed matrix ultrafiltration membrane was prepared by blending PVDF with the deformed rebar-like Fe 3 O 4 –palygorskite nanocomposites (MPGS) using the chemical coprecipitation method. Fe 3 O 4 nanoparticles were anchored on the surface of the palygorskite nanofibers to form deformed rebar-like structures. MPGS were then distributed uniformly on the membrane matrix. PVDF chains firmly wrapped by the deformed rebar-like nanocomposites consequently enhanced the tensile strength of the PVDF membrane. At 7.0 wt % MPGS, the tensile strength increased from 1.59 MPa to 2.66 MPa. The overall thickness, skin layer thickness, finger-like voids, average pore size and surface roughness of membranes decreased with increasing amounts of MPGS. The rejection of the membrane increased to 99.09% at 7.0 wt % MPGS. The contact angle of membranes decreased from 99.14° (pure PVDF) to 78.76° (PVDF/7.0 wt % MPGS). On the other hand, the pure water flux of membranes increased from 123.57 L m −2 h −1 (pure PVDF) to 356.16 L m −2 h −1 (PVDF/7.0 wt % MPGS). The flux recovery rate of the mixed matrix membranes (PVDF/7.0 wt % MPGS) was as high as 80%. This was more than twice that of the pure PVDF membrane (31.6%). These results demonstrated that the deformed rebar-like structure of the MPGS played a critical role in determining the structures and properties of PVDF mixed matrix ultrafiltration membranes. The hydrophilicity, thermal stability, permeation flux and antifouling property of the mixed matrix membranes increased with addition of MPGS. As such, PVDF/MPGS membranes had excellent comprehensive properties thus making them ideal for application in numerous fields.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 19
·8403-8419
·
IF 3.553
Zhang Yuhui,Lin Ligang,Wang Qi,Qiang Rongrong,Gao Yixin,Ma Sisi,Cheng Qi,Zhang Yuzhong
A new strategy was proposed that simultaneously improves the pervaporation (PV) performance and solvent resistance via the construction of a movable crosslinked structure in ethyl cellulose/polyvinylidene fluoride (EC/PVDF) composite membrane for the purpose of benzene/cyclohexane separation. Based on the molecular design of the macrocyclic compound cyclodextrin, polyrotaxane crosslinking agent (PR=) with a special sliding/rotating property and cavity structure was successfully synthesized. Furthermore, for convenient comparative study, cyclodextrin crosslinking agent (CD=) with cavity structure bereft of a sliding/rotating property and pentaerythritol triacrylate (PETA) without sliding/rotating property and cavity structure were prepared. The composite membranes were fabricated with crosslinking modified EC as active layer, together with PVDF support layer. The molecular structure and microstructure were confirmed. The pervaporation and swelling performance of the fabricated membranes for benzene/cyclohexane were investigated. PR= modified membranes showed good solvent resistance and exhibited a flux of 4332 g·m −2 ·h −1 and separation factor of 6.26, which was higher than CD= and PETA modified membranes. The results were attributed to the facilitated transport behavior, which was markedly related with the sliding/rotating property and cavity structure of polyrotaxane (PR). The related research provides interesting suggestions for PV membrane design for the separation of organic mixtures.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2020
·
IF 3.306
Jinying Du,Ning Li,Yu Tian,Jun Zhang,Wei Zuo
A novel composite membrane was prepared successfully by blending polyvinylidene fluoride (PVDF) with the synthesized graphene oxide-zinc sulfide (GO-ZnS) nanocomposites via phase inversion method. The dispersion of GO-ZnS and its effect on the performance of the PVDF membrane were investigated using the morphology, crystal structure and chemical composition of the composite PVDF membrane. With the content of GO-ZnS in the PVDF membrane increasing from 0 to 5.0 wt%, the contact angle declined continuously and thus the hydrophilicity of membrane increased after modification. Similarly, the pure water flux of GO-ZnS/PVDF membrane reached up to 431.9 L/(m 2 h) when 5.0 wt% GO-ZnS was blended. All membranes presented a high bovine serum albumin (BSA) removal and the rejection was about 86.5%. More importantly, the GO-ZnS/PVDF membrane exhibited a smaller irreversible fouling ratio and a higher flux recovery rate, revealing that blending with GO-ZnS could improve the self-cleaning under UV irradiation and the antifouling properties of PVDF membrane.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Lanlan Tian,Mengkun Wang,Lian Xiong,Chao Huang,Haijun Guo,Shimiao Yao,Hairong Zhang,Xinde Chen
Poly (methyl methacrylate) (PMMA) based gel electrolyte has excellent chemical stability and low interfacial resistance but its mechanical strength is poor. In this study, organic palygorskite modified PMMA (p(OPal-MMA)/poly(vinylidene fluoride)) (PVDF) blend based electrolyte membrane was prepared via phase inversion casting technique. The physical and electrochemical properties of the blend membrane were investigated by XRD, SEM, tensile test and electrochemistry workstation. The results showed that PVDF can significantly improve the mechanical strength. The crystal phase of PVDF disappeared after blending. The porosity and ionic conductivity of the p(OPal-MMA)/PVDF membrane was 57.73% and 4.93 × 10 −3 S/cm respectively. The electrochemical stability window of Li/gel B-PVDF electrolyte/SS cell was stable up to 4.7 V (vs. Li + /Li), and the cell of Li/gel B-PVDF 43% electrolyte/LiFePO 4 exhibited good cycling performance and the Coulombic efficiency was maintained above 98.5% during all the cycling process.
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高影响因子
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