Self-sustained webs of polyvinylidene fluoride electrospun nano-fibers: Effects of polymer concentration and desalination by direct contact membrane distillation

Essalhi, M.; Khayet, M.

doi:10.1016/j.memsci.2013.11.056

Cited by 124 publications

(64 citation statements)

References 40 publications

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“…The sample (effective membrane area 5 2.7 cm 2 ) was wetted with Profil and was placed into a test cell, through which compressed air flowed, and then, the measurements were carried out according to a procedure described in the literature. 36 The mean pore size was determined with the aid of Porolux 500 software (porometer).…”

Section: Methodsmentioning

confidence: 99%

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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Section: Methodsmentioning

confidence: 99%

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 critical concentration can also be approximated using a viscosity plot and by identifying the sharp shift in viscosity as a function of polymer concertation [36]. When the polymer concentration in solution is low, chain entanglement is not sufficient to promote chain overlap, which means fiber formation is not achievable or is poor [43]. When the solution concentration reaches and surpasses (T) value, intermolecular forces enable pristine fiber formation.…”

Section: Congruence and Parametric Controlmentioning

confidence: 99%

Multi-compartment centrifugal electrospinning based composite fibers

Wang

Ahmad

Huang

et al. 2017

Chemical Engineering Journal

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Multi-faceted technological advances in fiber science have proven to be invaluable in several emerging biomaterial and biomedical engineering applications. In the last decade, notable fiber engineering advances have been demonstrated ranging from co-axial flows (for micron and nano-scaled layering), non-concentric flows (for Janus composites) and even 3D printing (for controlled alignment). The ES process is however limited, both for commercial impact (low production rates) and also in its facile capability to deliver reliable mimicry of numerous biological tissues which comprise blended and aligned fibers (e.g. tendons and ligaments). In the technological advance demonstrated here, a combinatorial multi-compartment centrifugal electrospinning (CMCCE) system is developed and demonstrated. A proof-of-concept enabling multiple formulation solution hosting (including combinatorial grading) in a single centrifugal electrospinning system (CES) comprising one spinneret is shown. Using this process, controlled blending and tuning of resulting fibrous membrane properties (contact angle and active release behavior) via aligned and phased fiber mat composition is demonstrated. In addition, the CMCCE process is capable of replicating production rates of recently developed centrifugal electrospinning systems (~120 g/h), while potentially permitting better mimicry of naturally occurring fibrous tissue blends. It is envisaged the advance in technology will be ideally suited to engineer synthetic fibrous biomaterials with greater host surface replication and will fulfil production rate requirements for the industrial sector.

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“…Preparation conditions of PVDF and PDMS-PVDF membranes in this study were listed in Table 1. Membrane porosity (ε) was defined as the volume of the pores divided by the total volume of the microporous membrane and was determined by gravimetric method described in the literature [29]. A sample of wet membrane, which had been soaked in a low surface tension (16 dyn/cm) wetting liquid (Profil, supplied by IB-FT GmbH, Germany), was weighed using a highly sensitive electronic balance (ALC-1100.2, sartorius, German, accuracy of 0.0001 g).…”

Section: Preparation Of Membranesmentioning

confidence: 99%

“…This instrument uses the wet/dry flow method. The sample with the effective membrane area 2.7 cm 2 was wetted with the Profil and was placed into a test cell through which a compressed air flowed, then the measurements were carried out following the procedure described in literature [29]. The mean pore size was determined with the aid of the software Porolux 500 (Porometer).…”

Section: Mean Pore Sizementioning

confidence: 99%

“…According to literatures [22][23][24][25][26][27][28][29][30], the viscosity of casting solution is an important parameter for the forming of the membrane and it must be above a certain value otherwise the film cannot form during the demixing process. In addition, viscosity affects the kinetics of coagulation through affecting the interdiffusions between non-solvent and solvent.…”

Section: Viscosity Of Casting Solutionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation and characterization of PDMS-PVDF hydrophobic microporous membrane for membrane distillation

et al. 2015

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Self-sustained webs of polyvinylidene fluoride electrospun nano-fibers: Effects of polymer concentration and desalination by direct contact membrane distillation

Cited by 124 publications

References 40 publications

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

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

Multi-compartment centrifugal electrospinning based composite fibers

Preparation and characterization of PDMS-PVDF hydrophobic microporous membrane for membrane distillation

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