The sol/gel contribution to the behavior of γ-irradiated poly(vinylidene fluoride)

1991 ◽  
Vol 43 (3) ◽  
pp. 535-541 ◽  
Author(s):  
Y. Rosenberg ◽  
A. Siegmann ◽  
M. Narkis ◽  
S. Shkolnik
Keyword(s):  
Vinylidene Fluoride ◽  
Sol Gel ◽  
Poly Vinylidene Fluoride

scholarly journals Preparation and Electrochemical Characterization of Organic–Inorganic Hybrid Poly(Vinylidene Fluoride)-SiO2 Cation-Exchange Membranes by the Sol-Gel Method Using 3-Mercapto-Propyl-Triethoxyl-Silane

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3265 ◽  
Author(s):  
Li ◽  
Li ◽  
Li ◽  
Guan ◽  
Zheng ◽  
...  
Keyword(s):  
Membrane Potential ◽  
Oxidative Stability ◽  
Water Uptake ◽  
Polyvinylidene Fluoride ◽  
Vinylidene Fluoride ◽  
Sol Gel ◽  
Synthesis Method ◽  
Co2 Production ◽  
Inorganic Hybrid ◽  
Poly Vinylidene Fluoride

A new synthesis method for organic–inorganic hybrid Poly(vinylidene fluoride)-SiO2 cation-change membranes (CEMs) is proposed. This method involves mixing tetraethyl orthosilicate (TEOS) and 3-mercapto-propyl-triethoxy-silane (MPTES) into a polyvinylidene fluoride (PVDF) sol-gel solution. The resulting slurry was used to prepare films, which were immersed in 0.01 M HCl, which caused hydrolysis and polycondensation between the MPTES and TEOS. The resulting Si-O-Si polymers chains intertwined and/or penetrated the PVDF skeleton, significantly improving the mechanical strength of the resulting hybrid PVDF-SiO2 CEMs. The -SH functional groups of MPTES oxidized to-SO3H, which contributed to the excellent permeability of these CEMs. The surface morphology, hybrid structure, oxidative stability, and physicochemical properties (IEC, water uptake, membrane resistance, membrane potential, transport number, and selective permittivity) of the CEMs obtained in this work were characterized using scanning electron microscope and Fourier transform infrared spectroscopy, as well as electrochemical testing. Tests to analyze the oxidative stability, water uptake, membrane potential, and selective permeability were also performed. Our organic–inorganic hybrid PVDF-SiO2 CEMs demonstrated higher oxidative stability and lower resistance than commercial Ionsep-HC-C membranes with a hydrocarbon structure. Thus, the synthesis method described in this work is very promising for the production of very efficient CEMs. In addition, the physical and electrochemical properties of the PVDF-SiO2 CEMs are comparable to the Ionsep-HC-C membranes. The electrolysis of the concentrated CoCl2 solution performed using PVDF-SiO2-6 and Ionsep-HC-C CEMs showed that at the same current density, Co2+ production, and current efficiency of the PVDF-SiO2-6 CEM membrane were slightly higher than those obtained using the Ionsep-HC-C membrane. Therefore, our novel membrane might be suitable for the recovery of cobalt from concentrated CoCl2 solutions.

FESEM-EDX and CV Characteristics of Dopant (Mn, Co, Ni) Magnesium Ferrites

2013 ◽  
Vol 645 ◽  
pp. 150-153
Author(s):  
Siti Soleha Jonit ◽  
Madzlan Aziz ◽  
Rita Sundari
Keyword(s):  
Vinylidene Fluoride ◽  
Sol Gel ◽  
Carbon Electrode ◽  
Magnesium Ferrite ◽  
Cyclic Voltammetric ◽  
X Ray ◽  
Screen Printed Carbon Electrode ◽  
Scan Rate ◽  
Poly Vinylidene Fluoride ◽  
Mn Doped

Doping magnesium ferrites (MgFe2 O4) with Mn, Co and Ni, which were synthesized by sol gel method using citric acid and polyvinyl alcohol (P VA) and calcined at 500oC, showed interesting electrochemical featur es based on their cyclic voltammetric (CV) characteristics using 5 µL ferrite – poly vinylidene fluoride in ethano l deposited on a screen printed carbon electrode (SPCE) in a mixture of 1.0 M KOH and ferricyanide solution recorded with a scan rate of 0.02 Vs -1. The Mn doped magnesium ferrite (x = 0.9) showed the most remarkable CV performance over other doped element (Co and Ni) and un-doped magnesiu m ferrites. The surface morphology of doped ferrites was studied by applying a field emissi on scanning electron microscope (FESEM) in conjunction with an energy dispersive X-ray spect roscopy (EDX) analysis. The results revealed that Mn posed the highest percentage on the surface ( ≈ 21.5 %), followed by Co (≈ 19.5%) and Ni ( ≈ 6.7%) with respect to x = 0.9 of M0.9Mg0.1Fe 2 O4 (M = Co, Mn and Ni) at 500oC calcination. The study showed the possibility of yielding semi conducting ferrites using own fabricated magnesium ferrite and its metal doping.

Accelerating the Design of β-CD-PVDF-based Molecularly Imprinted Nanocomposite Membrane for Selective Separation: A Surface Functional Monomer-Directing Strategy

NANO ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. 2050138
Author(s):  
Junda Wu ◽  
Jia Gao ◽  
Zhiqing Hou ◽  
Wendong Xing ◽  
Jiangdong Dai ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Sol Gel ◽  
Composite Membranes ◽  
Basal Membrane ◽  
Inversion Method ◽  
Separation Performance ◽  
Hydroxyl Groups ◽  
Functional Monomer ◽  
Practical Applications ◽  
Poly Vinylidene Fluoride

Enoxacin, as the broad-spectrum antibacterial activity antibiotics, has been widely used in treatment of bacterial diseases in animals and humans around the world. The extensive use of enoxacin in healthcare has also caused increasingly serious environmental risk as a matter of course. In this work, enoxacin imprinted poly (vinylidene fluoride) (PVDF) composite membranes (EIPCMs) were developed by strategy of surface grafting beta-cyclodextrin ([Formula: see text]-CD) for the improved hydrophilic and antifouling properties of the basal membrane. PVDF membrane was prepared by phase inversion method, and [Formula: see text]-CD was grafted onto the surface after hydroxyl groups modification. The effects of adding amount of [Formula: see text]-CD on performance of basal membranes were systematically examined. Further, the specific recognition sites were fabricated via sol–gel surface imprinting method using 3-aminopropyltriethoxysilane (APTES) and tetraethoxysilane (TEOS) as functional monomer and cross-linker, respectively. The specific adsorption and permeation experiments were investigated and explored the separation performance and mechanism of EIPCM. The results indicated that the as-prepared EIPCMs not only exhibited highly favorable features and high rebinding strength (31.25[Formula: see text]mg g[Formula: see text], but also possessed superior selective performance toward enoxacin (imprinted factor [Formula: see text] is 3.15). Furthermore, in order to investigate the practical applications of EIPCMs, the adsorption experiments were carried out using environmental sewage. The work developed here shows great potential for further applications in selective recognition and separation antibiotics pollution from the environment.

scholarly journals Sol-gel transitions of poly(vinylidene fluoride) in organic solvents containing LiBF4

2011 ◽  
Vol 43 (6) ◽  
pp. 540-544 ◽  
Author(s):  
Hidenobu Shimizu ◽  
Yuka Arioka ◽  
Masaki Ogawa ◽  
Risei Wada ◽  
Masaru Okabe
Keyword(s):  
Organic Solvents ◽  
Vinylidene Fluoride ◽  
Sol Gel ◽  
Poly Vinylidene Fluoride

A novel solid electrolyte formed by NASICON-type Li3Zr2Si2PO12 and poly(vinylidene fluoride) for solid state batteries

2021 ◽  
pp. 2140001
Author(s):  
Jingxiong Gao ◽  
Jie Wu ◽  
Songyi Han ◽  
Jingze Zhang ◽  
Lei Zhu ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Solid Electrolyte ◽  
Vinylidene Fluoride ◽  
Sol Gel ◽  
Cycle Performance ◽  
Composite Electrolyte ◽  
Electrolyte Membrane ◽  
Nasicon Type ◽  
Poly Vinylidene Fluoride ◽  
The One

Owing to their high ionic conductivity and excellent flexibility, composite polymer electrolytes (CPEs) have been widely studied in solid lithium metal batteries (SLMBs). In this study, a new solid electrolyte of NASICON-type Li3Zr2Si2PO[Formula: see text] (LZSP) was prepared by the sol–gel method, and then a new type of CPE membrane containing LZSP and Poly(vinylidene fluoride) (PVDF) was synthesized by slurry-casting method. The CPE membrane presented much higher ionic conductivity of 5.66 × 10[Formula: see text] S ⋅ cm[Formula: see text] at 25[Formula: see text]C and stronger electrochemical stability compared to the one without LZSP. In addition, the cells containing the composite electrolyte membrane exhibited considerable rate performance and cycle performance.

Physical properties of sol-gel derived poly(Vinylidene Fluoride)/Silica hybrid

1996 ◽  
Vol 108 (1) ◽  
pp. 279-289 ◽  
Author(s):  
Shoichiro Yano ◽  
Nobuaki Okubo ◽  
Kazutaka Takahashi
Keyword(s):  
Physical Properties ◽  
Vinylidene Fluoride ◽  
Sol Gel ◽  
Poly Vinylidene Fluoride ◽  
Silica Hybrid
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