Coatings
·
2025
·Vol. 15
·期 8
·965
·
IF 2.8
Wei Zhang,Xuran Zhu,Baoan Li,Boyang Hu,Leyu Shen,Yanzong Meng,Haifeng Gao
Commercial hydrophobic membranes encounter severe problems such as membrane wetting and membrane fouling under extreme conditions, which affect membrane separation performance. To enhance the anti-fouling abilities of hydrophobic membranes, a composite membrane with omniphobic characteristics was fabricated successfully in this paper. Titanium dioxide (TiO2) nanoparticles were in-situ grown via the hydrothermal synthesis method, and then fluorosilane with low surface energy was grafted on polyvinylidene fluoride (PVDF) membranes. Subsequently, the morphologies, chemical compositions, wetting properties and structural parameters of composite membranes were characterized systematically. Various contaminants were added to the feed to investigate the anti-fouling and anti-wetting performances of the composite membrane in membrane distillation tests. The results showed that butyl titanate was first hydrolyzed to form titanium hydroxide (Ti(OH)4) and then it was dehydrated to form TiO2in the hydrothermal environment. TiO2crystals continued to grow and formed rough morphology with micro-nano synergistic distribution, which is similar to a “sunflower” disk composed of cubic clusters and nanopillars. Meanwhile, fluorosilane successfully was grafted onto TiO2. The contact angles of deionized water, 0.4 mM sodium dodecyl sulfate (SDS) solution and 0.2%v/vmineral oil emulsion on the composite membrane surface were 167.3°, 162.0° and 158.5°, respectively, endowing the composite membrane with excellent omniphobic features. In direct contact membrane distillation (DCMD) tests, the composite membrane exhibited a relatively stable membrane permeate flux, and the salt rejection rate almost reached 100%. The mixture, consisting of inorganic salts, organic substances, surfactants and oil emulsions, was used as feed. In contrast, the commercial PVDF membrane flux decreased drastically and even dropped to 0 due to the membrane fouling and wetting. As for the pristine PVDF membrane, the membrane surface was covered with pollutants and membrane pores were blocked. Therefore, it was proved that the omniphobic composite membrane possesses outstanding anti-fouling and anti-wetting performance.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yan Zhong,Yangyang Liu,Jie Song,Meng Hu,Guanggui Cheng,Jianning Ding
Triboelectric nanogenerators (TENGs) are widely employed in self-powered pressure sensing, yet devices based on a single triboelectric layer have approached their performance ceiling. Herein, a “double triboelectric layer” strategy is proposed to construct a flexible, self-powered, single-electrode pressure sensor. The charge-generation layer employs Co-MOF with high surface area and excellent conductivity, blended into Ecoflex to maximize triboelectric charge output, while the charge-trapping layer incorporates highly electronegative PVDF into Ecoflex to suppress interfacial charge neutralization and expedite charge transport. Benefiting from the biomimetic micro-textured surface created by sandpaper templating, the enhanced charge-storage density afforded by Co-MOF-doped generation layer, and the elevated charge-transfer efficiency introduced by the PVDF-doped trapping layer, the device based on a double triboelectric layer boosts peak voltage to 86 V, which is a 177 % increase compared with the single-layer device (31 V). It delivers an ultrahigh sensitivity of 11.17 V kPa⁻¹ over 0–6 kPa and maintains stable operation beyond 11,00 cycles. With fast response and long-term reliability, the sensor accurately captures human motions and wrist-pulse signals. This architecture pioneers a pathway toward high-performance, self-powered sensors tailored for next-generation wearable electronics.
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POLYMER
·
2025
·
IF 4.5
San-Ni Zhao,Zi-Li Zhang,Li-Juan Yin,Yan Wang,Yi-Le Zhu,Zhi-Min Dang,Yu Zhao
Dielectric elastomers (DEs) have been extensively studied for their excellent electromechanical conversion properties, which make them ideal for flexible and non-magnetic drives. However, the common DEs usually require a high actuating electric field to achieve outstanding performance, severely limiting their application. In this study, advanced DE composites with good mechanical and dielectric properties was designed and synthesized (named as CPBA/PVDF). Adding DMF to the precursor solution and removing it after polymerization can lower the crosslinking density and increase linear polymer plasticizers in the matrix. As a result, the Young's modulus reduces and elongation at break arises without deteriorating the hysteretic and relaxation properties. Moreover, the incorporation of polar PVDF notably increases the tensile strength and dielectric constant of the composite films. Based on these, the CPBA/PVDF-3 gets a relatively high dielectric constant (5.74@1 kHz) and low modulus (0.144 Mpa), remarkably improves its actuation sensitivity (39.86), which is three times higher than that of the CPBA matrix (11.44). Therefore, CPBA/PVDF-3 achieved a high actuating strain of 25.1 % under 17.17 kV/mm with non pre-strain, and 160 % at 36.3 kV/mm under 200 % biaxial pre-tension. Importantly, it demonstrated a specific power density of 235 W/kg at just 16 kV/mm (@ 6 Hz). In addition, a simple linear actuator based on the CPBA/PVDF film can produce a free displacement of 0.755 mm (7.55 % of the actuator's effective length) and an output force of 306.95 mN/g at 15.7 kV/mm.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Weili Shao,Shengli Zhu,Liang Zhu,Wanying Han,Hui Xu,Gaowei Nie,Shuaitong Liang,Rongwu Wang,Fan Liu
Effective particulate matter (PM) filtration in air has become a significant focus of scientific research due to the increased focus on environmental health and sustainable development. In this work, efficient nanofiber scale preparation technology is realized, based on our self-developed electrospinning equipment. Polyvinylidene fluoride/fluorinated polyurethane (PVDF/FPU) nanofiber composite membrane with multi-scale structure was designed and prepared, and successfully applied in the field of air filtration. PVDF/FPU ultrafine nanofibers with a diameter of 30 ± 5 nm were produced by employing high-conductivity dilute solution electrospinning. Subsequently, a PVDF/FPU composite nanofiber membrane material with a double-layer multiscale structure was constructed by adjusting the proportion and sequence of the spinning units of different scales. The results indicate that this double-layer, multiscale PVDF/FPU composite nanofiber membrane features a minute average pore size (0.36 μm), a high porosity rate (94.56 %), and outstanding hydrophobic properties (with a contact angle of 138.6°). This demonstrated exceptional filtration efficiency (99.98 %) and low filtration resistance (67 Pa) under test conditions of 32 L/min. After 10 wash cycles, the filtration efficiency remained above 99 %, indicating remarkable stability. Furthermore, the COMSOL simulation software was utilized to analyze the gradient filtration mechanism of the nanofiber membrane, which correlated well with the experimental results. The double-layer multiscale PVDF/FPU nanofiber composite membranes developed during this study offers a novel approach for creating highly efficient, low-resistance air-filtration materials.
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ACS Sensors
·
2024
·
IF 8.2
Ying Xu,Zhiyu Li,Yuanrong Liao,Jun Wang,Tong Zhang,Xifu Liu,Yang Zhang
Noble metal nanoparticle (NMP)-based composite substrates have garnered significant attention as a highly promising technique for surface-enhanced Raman scattering (SERS) in diverse scientific disciplines because their remarkable ability to amplify and functionalize Raman signals has positioned them as valuable tools for molecular detection. However, optimizing the size and distribution of NMPs has not received sufficient emphasis because of challenges associated with the precise control of deposition and the modulation of reducing rates during growth. In this research, we achieved the optimized size and spatial patterns of AgNWs on electrospun poly(vinylidene fluoride) (PVDF) nanofibers by utilizing a polydopamine (PDA) layer as a mild and controllable reduction mediator, by which the size and density of the AgNWs could be relatively precisely manipulated, achieving a dense distribution of effective “hot spots”. On the other hand, harnessing the inherent piezoelectric properties of the electrospun PVDF nanofibers further boosted the LSPR effect during the SERS test, forming a flexible dual-enhancing composite SERS substrate with excellent sensitivity. In addition to addressing structural aspects, exploiting synergistic systems capable of transferring external energy or forces to enhance the SERS performances presents a compelling avenue to broaden the practical applications of SERS. The dual-enhanced substrate achieved an exceptional enhancement factor (EF) of 1.05 × 108 and a low detection limit (LOD) of 10–10 M during the SERS test. This study focuses on integrating NMPs with electrospun piezoelectric polymer nanofibers to develop a dual-enhancing SERS substrate with excellent sensitivity and practicality. The findings provide valuable insights into controllably depositing NMPs on electrospun polymer fibers and hold significant implications for the development of highly sensitive and practical SERS substrates across various applications.
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PubMed
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Zhongyang Tan,Lijun Chen,Jiming Jia,Tong Liu,Wenjie Zheng,Bang Yao,Xianghai Ran
Irradiation crosslinking has emerged as an efficient and eco-friendly strategy for polymer modification, aligning with green chemistry and sustainable development principles. This study incorporated sulfone-containing bismaleimide (s-BMI) into PVDF films via solution casting method, systematically investigating the effects of s-BMI incorporation and electron beam irradiation (0–228 kGy) on PVDF. FTIR results show that both s-BMI incorporation and the irradiation did not alter the predominant γ-phase formation in PVDF film. After the incorporation of s-BMI into PVDF, the shift of infrared characteristic absorption peaks, the singular melting/crystallization peaks in the DSC curves and the decrease in melting point and crystallization temperature of PVDF were observed, confirming the existence of molecular interaction between s-BMI and PVDF chain. PVDF film even containing 10 wt% s-BMI is homogeneous without defects and has good light transmittance of 54.8 % at 500 nm. SEM results confirm the uniform dispersion of s-BMI in the PVDF film, which indicates the good compatibility of s-BMI and PVDF. The incorporation of only 5 wt% s-BMI and the irradiation at 228 kGy increased the gel content (G c ) of PVDF film from 46.6 % to 66.6 % and thus significantly improved the dimensional stability at high temperatures with the strains at 230 °C of only 5.9 %. This study shows that sulfone-containing bismaleimide is an effective additive with good compatibility with PVDF and can significantly improve the efficiency of PVDF irradiation crosslinking. The irradiation-induced highly cross-linked PVDF films with polar crystalline phases developed in this study exhibits significant potential for application in functional devices operating under high-temperature conditions in the future.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Jinhui Huang,Jianglin Hu,Yahui Shi,Guangming Zeng,Wenjian Cheng,Hanbo Yu,Yanling Gu,Lixiu Shi,Kaixin Yi
Recently, the application of membranes faces a big challenge due to membrane fouling, to alleviate this situation, the hybridization of photocatalysis and membrane filtration has aroused significant attention. In this study, we firstly introduced melamine, cyanuric acid and urea in dimethyl sulfoxide (DMSO) as precursors to fabricated the MCU(DMSO)-C 3 N 4 material with excellent photocatalytic performance, and immobilized it on PVDF membranes by vacuum filtration, subsequently adding polyethylene glycol and glutaraldehyde as crosslinkers from MCU-C 3 N 4 /PVDF membrane. The results demonstrate that with the MCU-C 3 N 4 ratio increasing, the membrane flux was gradually decreased. Besides, the photocatalytic efficiencies of MCU-C 3 N 4 /PVDF for rhodamine B (RhB) and tetracycline hydrochloride (TC) degradation are 84.24% and 71.26% respectively, which are about 8 times higher than that of the original membrane. To evaluate antifouling performance of photocatalytic membranes, we conducted a four-stage filtration system, and the flux recovery ratio (FRR) of MCU-C 3 N 4 /PVDF membranes reached over 80% (optimum 91%) under visible light irradiating (λ > 420 nm) for 30 min. Meanwhile, under visible light irradiation reversible fouling (Rr) gradually became the dominant fouling factor instead of the irreversible fouling (Rir), indicating the excellent antifouling performance of MCU-C 3 N 4 /PVDF membranes. This novel method to modify membranes with MCU-C 3 N 4 gives insight to photocatalytic and self-cleaning properties of photocatalytic composite membranes, providing theoretical basis for their broad application.
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高影响因子
CARBON
·
2025
·
IF 11.6
Xiaoxiao Yu,Yu Zhang,Xiaolei Nie,Wei Song,Lisha Chen,Haotian Li,Wanting Zhu,Danqi He,Mingrui Liu,Ping Wei,Wenyu Zhao,Qingjie Zhang
High infrared emissivity and excellent thermal conduction capability are crucial for the heat dissipation performance of heat dissipation coatings, which are applicable in the thermal management of modern electronic components. Herein, SiC nanowires/Edge-oxidized graphene/polyvinylidene fluoride hexafluoropropylene (SiC NWs/EOG/PVDF-HFP) composite coatings with three-dimensional thermal conductivity network structure were successfully prepared by the in-situ growth of SiC NWs between EOG layers through high-temperature carbothermal reduction reaction. The out-of-plane thermal diffusivity of the SiC NWs/EOG/PVDF-HFP composite coating was increased by 27 %, as compared with that of the EOG/PVDF-HFP coating, which was originating from the enhanced phonon conduction in the vertical direction by the in-situ growth of SiC NWs. The stacking faults and twin crystals generated by SiC NWs, the structural defects introduced by EOG, and the multi-scale surfaces and interfaces introduced by EOG and SiC NWs have jointly improved the infrared emissivity, enabling the SiC NWs/EOG/PVDF-HFP composite coating achieved an emissivity of 0.92. The copper plate coated with SiC NWs/EOG/PVDF-HFP coating achieved a temperature drop benefit of 9.3 °C, increasing by 126 %, 93 % and 78 %, respectively, as compared with that of the copper plate coated with EOG/PVDF-HFP coating, the copper plate coated with mechanically compounded SiC/EOG/PVDF-HFP coating, and the copper plate coated with mechanically compounded SiC NWs-EOG/PVDF-HFP coating. These findings highlight the great potential of the SiC NWs/EOG/PVDF-HFP composite coatings for application in the thermal management of electronic devices.
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PLoS One
·
2025
·Vol. 20
·期 5
·e0319802
·
IF 2.6
Xiong Dien,Nurulazlina Ramli,Tzer Hwai Gilbert Thio,Cheng Linfeng,Zhang Lin,Yuan Jiang,Yang Zhuanqing
Among various emerging energy technologies, triboelectric nanogenerators (TENGs) have garnered significant attention owing to their ability to convert environmental mechanical energy into electrical energy through the triboelectric effect and electrostatic induction. However, there are some problems with optimizing the electrical output and conversion efficiency of TENGs. This paper presents a high-performance TENG enhanced with BaTiO₃ nanowires(BTONWs) using electrospinning technology. PVDF was doped with BTONWs to fabricate TENGs with high flexibility and efficient energy conversion. BaTiO₃ and PVDF all exhibited inherent properties and triboelectric properties, maximizing the conversion of pressure into electrical energy output. This integration effectively enhances the conversion power and provides a continuous energy supply. Experimental results show that the fabricated TENGs achieved a current and voltage of 12 μA and 280 V, respectively, with a maximum power density of 1.45 W/m 2 at a load resistance of 90 MΩ. In addition, the performance of the TENGs was tested using a calculator, timer, and LED lights. By connecting to a simple external circuit and continuously tapping the TENG, the devices functioned normally, demonstrating that the TENG can constantly and stably output electrical energy by continuously collecting mechanical energy to power microgenerators. This work may significantly contribute to developing energy harvesting, wearable devices, and micropower sources.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Zeren Kang,Wei Wang,Jinhai Xu,Xiaoji Zhou,Shusu Shen,Renbi Bai
The poor thermal stability of polyvinylidene fluoride (PVDF) membranes and their tendency to swell in organic solvents limit their widespread application in the field of membrane technology. In this study, the fluorinated polyimide (FPI), P(6FDA-BAPOFP), was investigated for the first time as a modifier for the PVDF membrane to enhance its stability at high temperatures and in organic solvents. By leveraging the inherent affinity between the C-F bond in FPI and PVDF, the compatibility of the physical blending has been significantly improved. The optimal addition of 2.5 % FPI led to a 2.0-fold increase in flux while preserving rejection. The introduction of FPI into the membrane effectively delayed the thermal weight loss, demonstrating stable performance in 90 °C water. In particular, after an operational period of up to 12 days, the modified membrane exhibited > 80 % Congo Red rejection and relative stable permeance (85 L·m −2 ·h −1 ·bar −1 ). This high-flux polymer membrane contributes to energy conservation and emissions reduction in industrial production.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Jianan Zan,Wei Shan,Lu Guo,Kwun Nam Hui,Min Luo,Fuming Chen
The global transition to green energy has precipitated a surge in the demand for lithium resources. However, terrestrial lithium reserves are limited and unevenly distributed. While the ocean harbors abundant lithium, its ultralow concentration and the interference from high concentrations of background ions pose significant challenges for efficient extraction. This study introduces a strategy for lithium extraction from seawater, leveraging the synergistic effect of a flexible LLZO/PVDF-HFP composite membrane and a TEMPO redox couple. A cubic phase garnet-type Li6.5Ga0.25La2.75Ba0.25Zr2O12 (LLZO) solid electrolyte, prepared via a sol–gel method, was compounded with PVDF-HFP to create a flexible membrane with high lithium-ion selectivity. With integration into a redox flow device, the TEMPO redox couple drives the transmembrane migration of lithium ions. The effects of the applied voltage, TEMPO concentration, and operating time on the lithium extraction performance were systematically investigated. At an optimal constant voltage of 1.5 V, the lithium concentration in the enriched solution reached 20.6 times that of the initial seawater. The system demonstrated excellent selectivity with Li/Na, Li/Ca, and Li/Mg selectivity factors of 2309.3, 11164.2, and 3808.9, respectively. After 72 h of continuous lithium extraction, the Li+ concentration in the recovered solution reached 130.6 times that of the feed, with an average energy consumption as low as 34.1 Wh/g(Li). This research demonstrates a promising path for the development of low-cost, highly selective seawater lithium extraction technologies.
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高影响因子
CHINESE CHEMICAL LETTERS
·
2025
·
IF 8.9
Bin Wang,Qingqing Zhou,Junjie Lu,Chuyang Li,Mengmeng Fan,Wenwei Ding,Bifu Sheng,Wenjuan Zhu,Qian Ni,Huixin Chen,Xiang Han
Poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP)-based solid polymer electrolytes show great potential for high energy lithium metal batteries, however, the residual solvent and related severe side reactions limit its development. Herein, a PVDF-HFP-based solid polymer electrolyte modified by fluorobenzene (FB) co-solvent is designed to address these problems. The introduced FB with weak solvation interaction regulates the coordination environment and induces anions to enter the solvation structure, generating more contact ion pairs (CIPs) and aggregates (AGGs). In addition, the anions-derived LiF-rich interphases help to improve the interface stability against Li metal. As a result, the FB-PVDF-HFP achieves high ionic conductivity (4.1 × 10 −4 S/cm) and low activation energy (0.125 eV) at room temperature. In addition, Li||Li symmetric cells using FB-PVDF-HFP electrolyte can achieve uniform and dendrite-free lithium deposition/stripping in the long-term cycling over 2300 h. The assembled solid-state Li|FB-PVDF-HFP|LFP full cell shows improved rate performance and cycling performance (600 cycles at 0.5 C and 450 cycles at 3 C) at room temperature. This work verifies the feasibility of fluorinated terminated solid polymer electrolytes on its lithium-ion transport and interfacial stability in lithium metal batteries.
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危险品化学品经营许可证（带存储）