Effect of selected spinning parameters on PVDF hollow fiber morphology for potential application in desalination by VMD

Simone, Silvia De; Figoli, Alberto; Criscuoli, A.; Carnevale, M.C.; Alfadul, Sulaiman M.; AlRomaih, Hamad; Shabouna, F.S. Al; Alharbi, Omar; Drioli, Enrico

doi:10.1016/j.desal.2014.03.004

Cited by 35 publications

(23 citation statements)

References 29 publications

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“…Based on these assumptions, the PES concentration was reduced from 20% to 18%. Plu F-127 5% was used as an additive; however, H 2 O 2% was also added to the dope, since it was found in previous works that it behaves as an excellent pore former [20,[40][41][42]. Different bore fluid compositions, with PEG or PEG/NMP were also tested in this case (Group 4 in Tables 3 and 4).…”

Section: Blank Pes Fiber Spinning Experiments and Optimization Of Dopmentioning

confidence: 99%

“…In the first group of experiments, polymeric dopes were prepared while keeping constant PES and PEG 400 concentrations, in order to compare the effect of the three additives (PVP K-17, PVP K-30, and Plu F-127). A small percentage of water was also added to the dopes, since it works as an excellent pore former [20,[40][41][42]. Viscosity was measured at 85 • C, since due to water's strong non-solvent nature, demixing may take place at a lower temperature.…”

Section: Polymeric Dope Viscositymentioning

confidence: 99%

“…The produced hollow fibers were kept in a frequently refreshed water bath for 1 day, in order to ensure complete coagulation and remove residual solvent. Then, they were soaked in a glycerol aqueous solution, with a concentration of 30 wt %, for 3-4 h, before drying, in order to avoid the collapse of their porous structure, as previously described elsewhere [20,[40][41][42].…”

Section: Dope Viscosity Measurementsmentioning

confidence: 99%

“…Fiber porosity, ε m , was calculated by measuring the void fraction, i.e., is the volume of the pores divided by the total volume of the membrane, by the gravimetric method described elsewhere [20,[40][41][42].…”

Section: Fiber Porositymentioning

confidence: 99%

“…The composition of the dopes used for the spinning experiments are listed in Table 3. Hollow fibers were produced as described elsewhere [20,[40][41][42], by the dry/wet technique. Detailed spinning conditions of each experiment are reported in Table 4.…”

Section: Dope Viscosity Measurementsmentioning

confidence: 99%

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Preparation and Characterization of Polymeric-Hybrid PES/TiO2 Hollow Fiber Membranes for Potential Applications in Water Treatment

Simone

Galiano

Faccini

et al. 2017

Fibers

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Abstract:In this work, poly(ethersulfone) (PES) ultrafiltration (UF) hollow fibers (HF) were modified by introducing TiO 2 nanoparticles (TiO 2 -NPs) in the polymeric dope, to endow them with photocatalytic properties. Different dope compositions and spinning conditions for producing "blank" PES UF fibers with suitable properties were investigated. PEO-PPO-PEO (Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol, Pluronic ® (Sigma-Aldrich, Milan, Italy) was finally selected as the additive and a suitable dope composition was identified. After the detection of an appropriate dope composition and the optimization of the spinning parameters, PES-TiO 2 HF was produced. The optimized composition was employed for preparing the mixed matrix HF loaded with TiO 2 NPs. The effect of different TiO 2 NP (0.3-1 wt %) concentrations and bore fluid compositions on the fiber morphology and properties were explored. The morphology of the produced fibers was analyzed by Scanning Electron Microscopy (SEM). Fibers were further characterized by measuring: pore size diameters and thickness, porosity, and pure water permeability (PWP). The photocatalytic activity of the new membranes was also tested by UV light irradiation. The model "foulant" methylene blue (MB) was used in order to prove the efficiency of the novel UF membrane for dye photo-degradation.

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Section: Blank Pes Fiber Spinning Experiments and Optimization Of Dopmentioning

confidence: 99%

Section: Polymeric Dope Viscositymentioning

confidence: 99%

Section: Dope Viscosity Measurementsmentioning

confidence: 99%

Section: Fiber Porositymentioning

confidence: 99%

Section: Dope Viscosity Measurementsmentioning

confidence: 99%

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Preparation and Characterization of Polymeric-Hybrid PES/TiO2 Hollow Fiber Membranes for Potential Applications in Water Treatment

Simone

Galiano

Faccini

et al. 2017

Fibers

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Highly Stretchable Separator Membrane for Deformable Energy‐Storage Devices

Shin

Song

Son

et al. 2018

Advanced Energy Materials

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LIBs), stretchable supercapacitors, and stretchable silver-zinc batteries. [5][6][7][8] Most of them mainly focused on the development of deformable current collectors (e.g., embedding conductive materials in soft substrates or elastic substrates) [9,10] or structural layouts (e.g., helically coiled spring design, serpentine interconnected configuration, and origami structure). [11][12][13] In comparison, a stretchable separator membrane for deformable energystorage devices attracts little attention. The separator membrane is basically used to prevent physical and electrical contact between electrodes while offering an ion conduction channel. [14] Various types of stretchable batteries are being developed, and thus the stretchable properties of the separator membrane are also required. Generally, because ionic gel-polymer electrolytes (GPEs) are easily controllable and sufficiently deformable, they have been employed as the separator membrane in deformable energy-storage devices. [13,15,16] Although ion-conducting GPEs can be used as both electrolyte and separator, they have intrinsically lower ionic conductivity than liquid electrolytes [17] and poor mechanical properties which are likely to cause an internal short problem due to the contact of both electrodes under physical deformation. [18,19] In order to fabricate a reliable stretchable energy-storage device without these limitations, the presence of a physical separation barrier having an ion-conducting channel and stretchability is essential. Recently, Liu et al. reported a stretchable separator membrane for wavy-structured stretchable LIBs using electrospinning techniques. [20] Li et al. also used electrospinning process to fabricate a stretchable polyurethane separator for stretchable supercapacitor. [21] However, electrospinning has critical drawbacks such as the use of complex equipment, slow production rate, and possible toxicity of chemical residues in electrospun fibers. Moreover, it has the limitation for largescale production for industry level due to its high cost. [22,23] Given these limitations, it is still necessary to develop and improve the fabrication methodologies for stretchable separator membranes. Although various attempts have been made in the membrane component to achieve the complete stretchability of the battery, the development of the standardized separator membrane that can be applied to various types of stretchable battery has not yet been reported. Therefore, the development of stretchable separator membranes with high processibility With the emergence of stretchable electronic devices, there is growing interest in the development of deformable power accessories that can power them. To date, various approaches have been reported for replacing rigid components of typical batteries with elastic materials. Little attention, however, has been paid to stretchable separator membranes that can not only prevent internal short circuit but also provide an ionic conducting pathway between electrodes under extreme physical deformation. Herei...

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Effect of the exposure time on the structure and performance of hydrophobic polydimethylsiloxane–poly(vinylidene fluoride) membranes via a non‐solvent‐induced phase separation process in a clean room

Zhang

Sun

et al. 2016

J of Applied Polymer Sci

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The objective of this study was to investigate the effects of the exposure time on the properties and permeability of polydimethylsiloxane (PDMS)-poly(vinylidene fluoride) (PVDF) blend hydrophobic microporous membranes, which were fabricated via a non-solvent-induced phase separation process at 25 8C and 60% relative humidity in a clean-room circumstance. For the prepared PDMS-PVDF membranes, the membrane morphologies were observed by scanning electron microscopy. Crystalline structures were observed by X-ray diffraction. Pore structures were analyzed by membrane porosity and mean pore size. Hydrophobicity was measured by contact angle measurement, and the mechanical properties were characterized by tensile strength testing. Our study results show that with increasing exposure time from 10 to 110 s, all of the membranes showed a similar pore structure: a spongelike substrate layer with a thin realm of fingerlike structures under the top surface. Phase separation between PDMS and PVDF occurred. The membrane porosity and mean pore radius decreased, and the membrane thickness increased. The membrane hydrophobicity decreased, and the mechanical properties first increased and then decreased. In addition, vacuum membrane distillation experiments were conducted. With the increase in the exposure time from 10 to 110 s, the membrane permeate flux decreased from 16.54 to 6.65 kg m 22 Áh 21, and the salt rejection was higher than 99.9%.

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Effect of selected spinning parameters on PVDF hollow fiber morphology for potential application in desalination by VMD

Cited by 35 publications

References 29 publications

Preparation and Characterization of Polymeric-Hybrid PES/TiO2 Hollow Fiber Membranes for Potential Applications in Water Treatment

Preparation and Characterization of Polymeric-Hybrid PES/TiO2 Hollow Fiber Membranes for Potential Applications in Water Treatment

Highly Stretchable Separator Membrane for Deformable Energy‐Storage Devices

Effect of the exposure time on the structure and performance of hydrophobic polydimethylsiloxane–poly(vinylidene fluoride) membranes via a non‐solvent‐induced phase separation process in a clean room

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