Facile fabrication of nanofiber- and micro/nanosphere-coordinated PVDF membrane with ultrahigh permeability of viscous water-in-oil emulsions

2018 ◽  
Vol 6 (16) ◽  
pp. 7014-7020 ◽  
Author(s):  
Jindan Wu ◽  
Yajie Ding ◽  
Jianqiang Wang ◽  
Tiantian Li ◽  
Haibo Lin ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Nanofibrous Membrane ◽  
Pvdf Membrane ◽  
Poly Vinylidene Fluoride ◽  
Facile Fabrication ◽  
Oil Emulsions

A superhydrophobic, superoleophilic and under oil superhydrophobic poly (vinylidene fluoride) (PVDF) nanofibrous membrane was developed through a facile electrospinning strategy.

Flexible Fibrous Piezo-Electric Sensor on Printed Silver Electrode

2014 ◽  
Vol 1685 ◽  
Author(s):  
Ho Yeon Son ◽  
Yoon Sung Nam ◽  
Woo Soo Kim
Keyword(s):  
Vinylidene Fluoride ◽  
Silver Nanowires ◽  
High Sensitivity ◽  
Cost Effective ◽  
Piezoelectric Sensor ◽  
Piezoelectric Sensors ◽  
Mechanical Stimuli ◽  
Aligned Arrays ◽  
Poly Vinylidene Fluoride ◽  
Facile Fabrication

ABSTRACTHere we introduce a facile method to fabricate a flexible piezoelectric sensor using one-dimensional (1-D) piezoelectric poly(vinylidene fluoride) (PVDF) nanofibers directly produced onto flexible printed electrodes by electro-spinning without an additional poling process. The flexible silver electrodes are fabricated on polyethylene terephthalate (PET) using silver nanowires by easy and cost-effective spraying deposition. The electrospun PVDF nanofibers have uniaxially aligned arrays on the electrodes by using a rotating collector. The fabricated PVDF piezoelectric sensors demonstrate the piezoelectric responses with repeated mechanical stimuli with good flexibility and high sensitivity. We expect that the facile fabrication of PVDF piezoelectric sensors on flexible printed electrodes can be usefully exploited to integrate the piezoelectric sensors into flexible and stretchable functional electronic devices.

scholarly journals Fabrication of a PVDF membrane with tailored morphology and properties via exploring and computing its ternary phase diagram for wastewater treatment and gas separation applications

RSC Advances ◽  
2020 ◽  
Vol 10 (66) ◽  
pp. 40373-40383
Author(s):  
S. Ashtiani ◽  
M. Khoshnamvand ◽  
P. Číhal ◽  
M. Dendisová ◽  
A. Randová ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Wastewater Treatment ◽  
Phase Separation ◽  
Ternary Phase ◽  
Vinylidene Fluoride ◽  
Ternary Phase Diagram ◽  
Simple Approach ◽  
Hydrophobic Properties ◽  
Pvdf Membrane ◽  
Poly Vinylidene Fluoride

We report a simple approach for tailoring the morphology of poly(vinylidene fluoride) (PVDF) membranes fabricated using a nonsolvent induced phase separation (NIPS) method that sustains both the hydrophilic and hydrophobic properties.

Structure and Morphology of PVDF-G-PAMPS Membrane

2011 ◽  
Vol 197-198 ◽  
pp. 1321-1324 ◽  
Author(s):  
Gui Bao Guo ◽  
Sheng Li An
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Sulfonic Acid ◽  
Proton Exchange Membrane ◽  
Vinylidene Fluoride ◽  
Proton Exchange ◽  
Pvdf Membrane ◽  
Structure And Morphology ◽  
Poly Vinylidene Fluoride ◽  
Exchange Membrane

A proton exchange membrane of blended poly (acrylamido-2- methylpropane sulfonic acid) (PAMPS) grafted onto modified poly (vinylidene fluoride) (PVDF) membrane (PVDF-g-PAMPS) was prepared. Fourier transform infrared spectroscopy is used to characterize changes of the membrane's microstructures after grafting. The morphology of the membrane's microstructures after grafting is studied by scanning electrolytic microscope.The results show that 2-acrylamido-2-methylpropane sulfonic acid is easily grafted into PVDF modified by Plain sodium silicate (Na4SiO4).

scholarly journals Hydrophilic modification of poly(vinylidene fluoride) ultrafiltration membranes by surface UV photo-grafting with N,N′-methylene-bisacrylamide as monomer and Ce(IV) as initiator

2015 ◽  
Vol 6 (2) ◽  
pp. 280-289
Author(s):  
Baoli Shi ◽  
Zheng Li ◽  
Xing Su
Keyword(s):  
Vinylidene Fluoride ◽  
Membrane Surface ◽  
Ultrafiltration Membranes ◽  
Water Contact ◽  
Pvdf Membrane ◽  
Hydrophilic Modification ◽  
Poly Vinylidene Fluoride ◽  
Modified Membrane ◽  
Porosity Measurements ◽  
Pure Pvdf

A UV photo-grafting method was utilised to enhance the hydrophilicity and anti-fouling property of self-made poly(vinylidene fluoride) (PVDF) ultrafiltration membranes. N,N′-methylene-bisacrylamide (MBAA) was used as monomer and Ce(IV) was used as initiator to obtain balance between grafting treatment consumption and enhanced performance. MBAA could be grafted onto the surface of pure PVDF membranes through a water-phase grafting method under UV photoradiation. When the MBAA concentration was 0.07 mol/L, the Ce(IV) concentration was 0.04 mol/L, and the irradiation duration was 3 min, the membrane surface was grafted with a sufficient amount of monomer under a UV photoradiation intensity of 5.0 mW/cm2. The water contact angle on the surface of the modified membrane decreased by approximately 16°, and flux recovery increased by approximately 40% compared with the pure PVDF membrane when treating river water. For bovine serum albumin rejection and porosity measurements no significant changes were observed between pure PVDF and graft-treated membranes. The enhanced performance of the modified membrane in this work was moderate, but the UV irradiation duration (3 min) was short. The integrative effects of UV modification in this work were satisfactory when both irradiation duration and enhanced performance were considered.

An Electrospun Poly(vinylidene fluoride) Nanofibrous Membrane and Its Battery Applications

2003 ◽  
Vol 15 (23) ◽  
pp. 2027-2032 ◽  
Author(s):  
S.W. Choi ◽  
S.M. Jo ◽  
W.S. Lee ◽  
Y.-R. Kim
Keyword(s):  
Vinylidene Fluoride ◽  
Nanofibrous Membrane ◽  
Poly Vinylidene Fluoride

Effect of Thermal Treatment on the Physical Properties of Electrospun PVDF Membrane

2012 ◽  
Vol 591-593 ◽  
pp. 1113-1116
Author(s):  
Si Chen Cheng ◽  
Yin Zheng Liang ◽  
Yi Ping Qiu
Keyword(s):  
Thermal Treatment ◽  
Tensile Property ◽  
Tensile Testing ◽  
Vinylidene Fluoride ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
Pvdf Membrane ◽  
X Ray ◽  
Before And After ◽  
Poly Vinylidene Fluoride

The electrospinning technique was used to produce poly (vinylidene fluoride) (PVDF) membrane. Thermal treatment was introduced to improve the mechanical property and dimensional stability. In this paper, the PVDF membranes before and after thermal treatment were characterized by Scanning electron microscope (SEM), differential scanning calorimeter (DSC) and wide angle X-ray diffraction (WAXD), tensile testing. The crystallinity, tensile property, as well as melting temperature changed with the treated temperature. The results hows that thermal treatment could notably increase the tensile property of electrospun PVDF membrane and 160°C is a proper temperature for thermal treating

scholarly journals Surface modification of poly(vinylidene fluoride) hollow fibre membranes for biogas purification in a gas–liquid membrane contactor system

2017 ◽  
Vol 4 (11) ◽  
pp. 171321 ◽  
Author(s):  
Pengrui Jin ◽  
Chuan Huang ◽  
Jiaxiang Li ◽  
Yadong Shen ◽  
Liao Wang
Keyword(s):  
Vinylidene Fluoride ◽  
Spray Deposition ◽  
Hollow Fibre ◽  
Membrane Contactor ◽  
Pvdf Membrane ◽  
Hollow Fibre Membrane ◽  
Long Term Stability ◽  
Fibre Membrane ◽  
Poly Vinylidene Fluoride

The wetting of hollow fibre membranes decreases the performance of the liquid–gas membrane contactor for CO 2 capture in biogas upgrading. To solve this problem, in this work, a poly(vinylidene fluoride) (PVDF) hollow fibre membrane for a liquid–gas membrane contactor was coated with a superhydrophobic layer composed of a combination of hydrophobic SiO 2 nanoparticles and polydimethylsiloxane (PDMS) by the method of spray deposition. A rough layer of SiO 2 deposited on the PVDF membrane resulted in an enhanced surface hydrophobicity. The surface structure of the pristine PVDF significantly affected the homogeneity of the generated SiO 2 layer. A uniform surface coating on the PVDF upper layer resulted from the presence of micrometre and nanometre-sized roughness on the surface of the PVDF membrane, which was achieved with a SiO 2 concentration of 4.44 mg ml −1 (0.2 g/45 ml) in the coating solution. As a result, the water contact angle of the modified surface was recorded as 155 ± 3°, which is higher than that of the pristine surface. The high contact angle is advantageous for reducing the wetting of the membrane. Additional mass transfer resistance was introduced by the superhydrophobic layer. In addition, continuous CO 2 absorption tests were carried out in original and modified PVDF hollow fibre membrane contactors, using monoethanolamine (MEA) solution as the absorbent. A long-term stability test revealed that the modified PVDF hollow fibre membrane contactor was able to outperform the original membrane contactor and demonstrated outstanding long-term stability, suggesting that spray deposition is a promising approach to obtain superhydrophobic PVDF membranes for liquid–gas membrane absorption.

scholarly journals Enhancing the Antifouling Properties of Poly(vinylidene fluoride) (PVDF) Membrane through a Novel Blending and Surface-Grafting Modification Approach

ACS Omega ◽  
2018 ◽  
Vol 3 (12) ◽  
pp. 17403-17415 ◽  
Author(s):  
Shusu Shen ◽  
Yi Hao ◽  
Yiyuan Zhang ◽  
Ganwei Zhang ◽  
Xiaoji Zhou ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Surface Grafting ◽  
Pvdf Membrane ◽  
Grafting Modification ◽  
Poly Vinylidene Fluoride

Preparation and characterization of anti-fouling PVDF membrane modified by chitin

2017 ◽  
Vol 37 (3) ◽  
pp. 313-321 ◽  
Author(s):  
Manman Xie ◽  
Xia Feng ◽  
Juncheng Hu ◽  
Zhengyi Liu ◽  
Zijian Wang ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Membrane Surface ◽  
Solvent System ◽  
Pvdf Membrane ◽  
Blend Membrane ◽  
Poly Vinylidene Fluoride ◽  
And Performance ◽  
Membrane Structure And Performance ◽  
Precipitation Phase

Abstract Poly(vinylidene fluoride) (PVDF)/chitin (CH) blend membranes were prepared via the method of immersion-precipitation phase transformation with the solvent system N,N-dimethylacetamide (DMAc)/lithium chloride (LiCl) as solvent and water as coagulant. The effect of CH on membrane structure and performance was investigated. Owing to the strong hydrophilicity, CH chains enriched on the blend membrane surface and improved the hydrophilicity of the membrane. The addition of CH also led to the formation of finger-like pores and the increase of pore size and porosity. The flux and the flux recovery ratio (FRR) of the blend membrane were higher than that of pure PVDF membrane. The fouling resistance of the blend membrane was lower than that of PVDF original membrane. In a word, the addition of CH to PVDF membrane improved the hydrophilicity and the anti-fouling ability of PVDF membrane.

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