Scientific Reports
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2017
·Vol. 7
·期 1
·1-12
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IF 4.259
Xiong Zhu,Lin Haibo,Liu Fu,Xiao Peng,Wu Ziyang,Li Tiantian,Li Dehong
Instability of superwetting surface is the stumbling block of flexible polymeric membranes for continuous separation of water-in-oil or oil-in-water emulsions. Manipulation of rigid superwetting nano-TiO 2 on hierarchical poly(vinylidene fluoride) (PVDF) membrane by mimicking the plant roots holding soil behaviour enabled the generation of robust superwetting surface withstanding the harshly physical and chemical torture. The unique interface combination, which fabricated by a compacted nano-layer with the thickness of ~20 μm, was disclosed by systematic structure characterization. As demonstrated by SEM, LSCM and nano-CT, the pristine PVDF membrane with large quantities of cilia-like micro/nano-fibrils can function as the plant roots to capture, cage and confine the nanoparticles to form a robustly rigid nano-coating. The as-prepared membranes showed excellent durable separation performance both in varieties of stabilized water-in-oil and oil-in-water emulsion separation for a long term with few nanoparticles loss in a continuous crossflow mode. The strategy of assembling rigid inorganic nano-particles on flexible surface offers a window of opportunity for preparation of robust organic-inorganic hybrid membranes not only for continuous oil/water emulsion separation, but also for other functional application, such as electric conduction, heat conduction, ion exchange, and in membrane catalytic reactors etc.
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
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Hu Wang,Jiangchao Chen,Pengfei Pang,Yiran Bai,Zhiqiang Zheng,Tao Huang,Kunpeng Jiang,Yunyun Zhao,Guisheng Zhu,Huarui Xu
The development of lithium-metal batteries (LMBs) with high energy density and safety is considered a top priority for the next generation of rechargeable batteries. However, the mitigation of the inevitable reaction between lithium and the liquid electrolyte (LE), as well as the subsequent formation of Li dendrites, poses a crucial challenge that needs to be addressed. Upgrading traditional LEs serves as a pivotal strategy in achieving this objective. Here, we report a ZIF-8@SiO 2 /PVDF-HFP (ZSPH) quasi-solid electrolyte (QSE) with ultra-multistage pore crosslinked network structure. The interconnected micro-stage pore structure in a honeycomb-like morphology of polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) and the rich multistage pore structure of nanoscale SiO 2 “armored” zeolite imidazolium ester backbone-8 (ZIF-8@SiO 2 ) collectively establish a multi-stage ion transport channel. This unique structure facilitates appreciable ionic conductivity (2.21 × 10 −3 S cm −1 at 30 °C) and provides a wide and stable electrochemical window (approximately 5.0 V). The Li/ZSPH9-LiPF 6 /Li quasi-solid-state cell demonstrates an impressive longevity of over 1800 h at a current density of 0.2 mA cm −2 . The high compatibility of the interface between electrode and ZSPH QSE and effective inhibition of Li dendrites growth create synergistic effects, which make it possible to realize high energy density and safe LMBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Tao Zhang,Li-Zhi Zhang
Seawater desalination is regarded as a possible way to overcome current shortages of fresh water, and membrane-based air humidification–dehumidification desalination (MHDD) represents a promising technique owing to its high-quality freshwater and cost-effectiveness; however, its development is restricted by membrane fouling. While a superhydrophobic membrane provides resistance to hydrophilic fouling, it remains susceptible to hydrophobic fouling. Here, a polyvinylidene fluoride-ZnO/MXene (PVDF-ZM) membrane, with a reversible conversion between superhydrophobicity and hydrophilicity was fabricated to achieve universal fouling resistance. It earned a competitive permeate flux (3.93 kg·m −2 ·h −1 ) and an excellent salt rejection (>99.5%). The membrane exhibited a strong anti-hydrophilic fouling ability, benefiting from its superhydrophobicity and rough surface. The adsorbed hydrophobic contaminants could desorb from the membrane surface under UV irradiation when transforming the surface wettability into hydrophilicity, exhibiting an anti-hydrophobic fouling ability. Subsequently, the membrane surface returned to the hydrophobic state under dark conditions. The membrane recovered 90% of the original permeation flux, while maintaining a salt rejection of >99.5%, thus realizing membrane self-healing. The PVDF-ZM membrane holds promise for sustainable desalination applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
PubMed
高影响因子
COMBUSTION AND FLAME
·
2021
·
IF 4.185
Chun Zhang,Huiqing Mao,Rui Cui,Xiandie Zhang,Jing Yang,Jie Ji,Xiang Zhou
High content of active component, low electrostatic sensitivity and superior long-term storage stability endow n-Si powder unique advantages for application in nanoenergetic composites. In this study, hydrophobic and corrosion-resistant Si@PVDF nanostructured energetic films with different stoichiometric ratios are successfully prepared by electrospinning technique . The energetic characteristics are systematically investigated in terms of thermal analysis, open-air combustion and constant-volume combustion. The results show that Si@PVDF films are microscopically composed of fibers with diameters of about 200–300 nm. With the increase of stoichiometric ratio, more and more n-Si aggregates are found on the surface of fibers. When Si@PVDF is stored in deionized water (50 °C) or NaOH solution (50 °C, 3 mol/L) for 72 h, around 100% and 73.3% of n-Si is retained. Si@PVDF can be thermally ignited, with appreciable heat and pressure output, and the combustion behaviors are strongly affected by the stoichiometric ratio and the environmental conditions. As a comparison, physically mixed Si/PVDF cannot maintain a self-sustained combustion. Through the coupled thermal analysis and mass spectrometry analysis, combined with the morphological and structural characterization of the solid residues , the reaction mechanism of Si@PVDF at a low heating rate is preliminarily obtained.
研究领域:
材料科学
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能源材料
·
燃烧化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Xuan Zhang,Liang Shen,Chen-Yu Guan,Chu-Xuan Liu,Wan-Zhong Lang,Yan Wang
This work provides a facile and effective way of incorporating SiO 2 @MWNTs in polyvinylidene fluoride (PVDF) substrate to alleviate the internal concentration polarization (ICP) impact of the resultant thin film composite forward osmosis (TFC-FO) membranes for the first time. The in-situ decoration of multi-walled carbon nanotubes (MWNTs) using tetraethyl orthosilicate (TEOS) as precursor was conducted, resulting in improved hydrophilicity and the excellent dispersion of synthesized SiO 2 @MWNTs in PVDF membrane substrates accordingly. Effects of the SiO 2 @MWNTs concentration on the morphologies and properties of the modified substrates, and further impact on the polyamide (PA) layer structure are investigated via various characterizations. Besides, the intrinsic separation properties and forward osmosis performance of resultant TFC-FO membranes are also systemically studied. In comparison with the control TFC membrane, SiO 2 @MWNT-modified TFC membranes exhibit higher water fluxes with the enhanced membrane selectivity, as indicated by the decreased J S /J V values (from 1.10 to 0.19 g/L). This work therefore presents an alternative approach to prepare TFC-FO membranes with enhanced water flux as well as increased selectivity.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Zhanpeng Yu,Xin Sun,Cong Qi,Maoqing Tang,Cheng Xue
In order to enhance solar evaporation efficiency and reduce cost, the study combined polyvinylidene fluoride (PVDF) and multi-walled carbon nanotubes (MWCNTs) with low-cost cotton fabrics. The PVDF@MWCNTs cotton composite films were prepared by non-solvent induced phase separation method, which demonstrates excellent photothermal conversion performance. The effects of structure (two-dimensional structure, three-dimensional structure), shape of three-dimensional evaporation structure (triangular, semicircular and rectangular), light intensity and brine concentration on the evaporation performance were experimentally investigated. The evaporation rate of the rectangular structure with a height of 15 mm is 3.083 kg/m 2 ·h and the evaporation efficiency is 0.938 under two light intensities and a seawater concentration of 4 wt%. The evaporation rate of the two-dimensional structure for the same material is basically in the range of 1.50 kg/m 2 ·h. The evaporation rate can be more than doubled in three-dimensional structures compared to two-dimensional structures.
研究领域:
材料科学
·
能源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Dongdong Shen,Yi Liu,Miao Yu,Fanyuan Kong,Binjie Xin,Yan Liu
Humidity sensors have been essential applications in the field of environment protection, agriculture, health care, and so on. It is still focused on preparing sensor materials that can serve as both substrate and humidity sensing layer with low cost, good mechanical flexibility, excellent sensitivity, and reliability. Inspired by the microstructure of the Namib Desert Beetle, in this article, we design a facile method to combine hydrophobic structure with hydrophilic structure and achieve a flexible, responsible, stable sensor (BNFM) based on Zinc oxide NPs-Polyvinylidene fluoride (ZnO-PVDF) with functions of humidity-sensing. Benefiting from the beetle-like microstructure and the specific surface area of the nanofibrous membrane, the BNFM humidity sensor is characterized by an excellent sensitivity of more than 0.7 pF/RH% as well as good response/recovery time (15/7s) within the humidity range from 19 to 92% relative humidity. Besides, the BNFM humidity sensor can be arched inside a mask for real-time detection of human breath conditions. The facile and efficient fabrication technique presents a great platform for the exploration of multifunctional humidity sensors.
研究领域:
材料科学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2023
·
IF 9.9
Wu Mengjun,Song Jiangping,Lei Jiaheng,Tang Haolin
Composite polymer electrolytes (CPEs) have attracted much attention for high energy density solid-state lithium-metal batteries owing to their flexibility, low cost, and easy scale-up. However, the unstable Li/CPE interface is always challengeable for the practical utilization of CPEs. Herein, a polymer interlayer containing K + prepared by ultraviolet (UV)-curing precursor solution is coated on Li surface to stabilize the interface between poly(vinylidene difluoride) (PVDF) composite electrolytes and Li anode. Benefiting from the physical barrier of the interlayer, the continuous decomposition of PVDF is restrained and the intimate contact between electrode and electrolyte is also achieved to reduce the interface impedance. Moreover, the added K + is utilized to further regulate smooth Li deposition. As a consequence, the symmetric Li∣Li cell with coated Li demonstrates steady cycling at 0.4 mAh·cm −2 and a high critical current density of 1 mA·cm −2 . The assembled Li∣LiFePO 4 cell presents outstanding cycling stability (capacity retention of 90% after 400 cycles at 1 C) and good rate performance. The associated pouch cell performs impressive flexibility and safety. This work provides a convenient strategy to achieve stable Li/PVDF interface for high-performance PVDF-based solid state Li metal batteries.
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 Water Process Engineering
·
2024
·
IF 6.3
Shusu Shen,Qifeng Fan,Honglin Li,Lunbo Xu,Ganwei Zhang,Renbi Bai
Developing a stable MOF-modified membrane for efficient treatment of oily wastewater remains a challenge. In this study, NH 2 -MIL-88B(Fe) (NM88B) was deposited on the commercial polyvinylidene fluoride (PVDF) membranes, and grafted with perfluorohexane-1-sulfonic acid potassium salt (PFHx) to achieve quaternization modification. This reaction proceeds in an environmentally friendly manner due to the absence of any catalyst. The introduction of fluorine atoms through grafting PFHx resulted in the modified PVDF membrane (NPF) demonstrating remarkable underwater superoleophobic property with an underwater oil contact angle at ∼180°. In separation of various oil-water emulsions, the NPF membrane afforded a high permeation flux (up to 2043 L·m −2 ·h −1 ) and rejection rate (∼99 %). The oil rejection of NPF membrane was >99 % after 10 filtration cycles of n -hexadecane-water emulsion, and the pure water flux of the recovered membrane was kept at 82.65 % of the original flux, indicating a very good reusability and stability. Filtration of mixed dye/oil-water emulsions showed that the NPF membrane remove 99 % of both oil and dye from the mixture. This work provides a simple and stable modification of PVDF membrane, exhibiting remarkable underwater superoleophobicity and hydrophilicity , thereby harboring substantial prospects in the treatment of oily wastewater.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Kai Fu,Ping Huang,Shunjian Xu,Lei Liu,Xuewen Huang,Jun Luo,Yulin Li,Huilan Yu,Haiyan Fu,Hui Ou
Incorporating porous structures into flexible piezoelectric materials has proven to be an effective strategy to enhance the output performance, but the fabrication processes are often intricate or environmentally harmful. In this study, natural sucrose with substantial hydroxyl groups was firstly introduced into polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) as a phase formation inducer, and subsequently removed by the dissolution of water as a pore formation agent, yielding a regular porous structure. Furthermore, porosity of the PVDF-HFP film could be simply modulated by adjusting the mass ratio of sucrose to PVDF-HFP. At low porosity levels, the dielectric constant of PVDF-HFP decreased with the increase of porosity, reaching the minimum at the critical threshold porosity of 38.8 %. Owing to the increased β-phase content and the decreased dielectric constant, the sensitivity of the porous PVDF-HFP film based piezoelectric sensor was tripled to 117 mV/N, which held promise for detecting tactile and slip signals in mechanical arms.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
·
2024
·
IF 10.7
Lirong He,Xingang Liu,Cheng Han,Dehui Wang,Qi Wang,Xu Deng,Chuhong Zhang
For polyvinylidene fluoride (PVDF) based piezoelectric composites, epitaxial growth of ZnO nanorods (ZnO-nr) piezoceramic layer on PVDF is an effective way to improve their piezoelectric performance. However, the crystal nucleus of ZnO featuring polar surfaces that cannot be directly attached to hydrophobic PVDF with low surface energy. Herein, direct ink writing (DIW) 3D printing is employed for the first time to create β-PVDF reservoirs with significantly enhanced surface energy, facilitating the attachment and epitaxial growth of ZnO-nr. The printed β -PVDF reservoirs designed with programmed macro-pores and abundant inner micropores, enable a higher loading of ZnO-nr by more than one magnitude, thereby boosting the electro-mechanical response. The resulting PVDF/ZnO core–shell piezoelectric energy harvester (PEH) delivers an output voltage of 33.2 V, as well as an unprecedentedly high relative output voltage of 2.76 V/wt.%, which is 2.63 times that of the state-of-the-art 3D-printed PVDF/piezoceramics PEHs. Furthermore, it can differentiate subtle human motions whereas hybrid PEHs cannot distinct. This work demonstrates that the DIW 3D printing approach offers a simple and convenient design idea for creating high performance PEHs.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2015
·
IF 2.515
Yanhui Xiang,Yunze Wang,Haibo Lin,Yi Wang,Zhu Xiong,Fu Liu
ABSTRACT Efficient separation of both oil-in-water (O/W) and water-in-oil (W/O) micro-emulsion was accomplished by a novel thermally responsive PVDF membrane. PNIPAAm–PVP–VTES micro-hydrogel was elaborately synthesized and incorporated into PVDF membrane, which was validated by transmission election microscopy (TEM), dynamic light scattering (DLS), X-ray photoelectron spectroscopy (XPS), attenuated total reflection Fourier transformed infrared spectroscopy (FTIR-ATR), laser confocal microscopy and thermogravimetric respectively. The thermally responsive mechanism of the engineered PVDF membrane was proposed from aspects of molecule structure, micro-hydrogel, membrane topology and membrane performance. The permeability and separation efficiency for pure water, both O/W and W/O micro-emulsions were modulated by temperature. The engineered PVDF membrane exhibited superantiwetting, outstanding permeability, high separation efficiency (> 99.90%), excellent antifouling property and reliability for long-term application. Moreover, multistage separation of oil-in-water micro-emulsion was achieved at nano-scale. Dispersed micro-emulsion droplets bigger than 20 nm and 40 nm were completely removed by manipulating the temperature below and above LCST , respectively. The engineered PVDF membrane highlights its great potential in micro-emulsion separation.
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
危险品化学品经营许可证（带存储）