Preparation, characterization, and applications of electrospun ultrafine fibrous PTFE porous membranes

Huang, Yan; Huang, Qinglin; Liu, Huan; Zhang, Chaoxin; You, Yan-Wei; Li, Nana; Xiao, Changfa

doi:10.1016/j.memsci.2016.10.019

Cited by 120 publications

(50 citation statements)

References 21 publications

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“…Recently, successful hydrophilic coating of PTFE has been undertaken by Zhao et al 2019 [33], Li et al 2019 [34], and Villabos-Garcia et al 2018 [35], but also in the past by Song et al 2017 [36], Park et al 2015 [37], Mansouri et al 1999 [38], and Prasad et al 1987 [39], focusing, however, on different membrane applications. Although PTFE is a difficult polymer to work with and has little compatibility with other polymers, PVA from previous studies has worked satisfactorily with PTFE electrospun membranes [40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

et al. 2020

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This work focused on enhancing the flux on hydrophobic polymeric membranes aimed for direct contact membrane distillation desalination (DCMD) process without compromising salt rejection efficiency. Successful coating of commercial porous poly-tetrafluoroethylene membranes with poly(vinyl alcohol) (PVA) was achieved by solution dipping followed by a cross-linking step. The modified membranes were evaluated for their performance in DCMD, in terms of water flux and salt rejection. A series of different PVA concentration dipping solutions were used, and the results indicated that there was an optimum concentration after which the membranes became hydrophilic and unsuitable for use in membrane distillation. Best performing membranes were achieved under the specific experimental conditions, water flux 12.2 L·m-2·h-1 [LMH] with a salt rejection of 99.9%. Compared to the pristine membrane, the flux was enhanced by a factor of 2.7. The results seemed to indicate that introducing hydrophilic characteristics in a certain amount to a hydrophobic membrane could significantly enhance the membrane distillation (MD) performance without compromising salt rejection.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

et al. 2020

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“…A considerable amount of literature has been published on PTFE porous materials, such as the ultrafine fibrous PTFE porous material [ 17 ] and PTFE hollow fiber membrane [ 18 ] fabricated by electrospinning, focusing on investigation of surface properties. Publications that concentrate on PTFE/aerogel composites more frequently adopt dry mixing of PTFE particles with aerogels [ 19 ], wet mixing using aqueous PTFE dispersion [ 5 ] or PTFE powder [ 7 , 20 ] for engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Transport Properties of Electro-Sprayed Polytetrafluoroethylene Fibrous Layer Filled with Aerogels/Phase Change Materials

et al. 2020

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This work is the first attempt to prepare microporous polytetrafluoroethylene (PTFE) fibrous layers embedded with aerogels/phase change materials. For preparation of this layer, the needle-less electrospray technology of water dispersion of individual components is used. Microstructure characteristics, including surface morphology and particle size distribution, and various properties of the prepared materials were investigated and explained. Transport performance of the fibrous layers embedded with aerogels/phase change materials, such as the transmission of heat, air, and water vapor was evaluated and discussed in details. It was found that the electro-sprayed materials composed by spherical particles with rough surface had compact disordered stacking structure. Aerogels and phase change materials (PCMs) play different roles in determining structural parameters and transport properties of the materials. Those parameters and properties could be flexibly adjusted by optimizing the spinning parameters, changing the content or proportion of the fillers to meet specific requirements.

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“…[33][34][35] Specifically for electrospinning PTFE, dispersion of PTFE particles in water, stabilised by wetting agents, have been used along with a blend of water-soluble polymer for the preparation of the PTFE fibrous membranes. 29,36 Reports from Xiong et al 37 and Zhou et al, 38 have utilised polyvinyl alcohol (PVA) as the carrier material to produce PTFE/PVA composite fibres which were further sintered to obtain PTFE nanofibres. Similarly, Feng et al have utilised polyethene oxide (PEO) as the carrier material to obtain PTFE nanofibres from intermediate PTFE/PEO fibres.…”

Section: Introductionmentioning

confidence: 99%

Emulsion Electrospinning of Polytetrafluoroethylene (PTFE) Nanofibrous Membranes for High-Performance Triboelectric Nanogenerators

Zhao

Soin

Prashanthi

et al. 2018

ACS Appl. Mater. Interfaces

154

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Electrospinning is a simple, versatile technique for fabricating fibrous nanomaterials with the desirable features of extremely high porosities and large surface areas. Using emulsion electrospinning, polytetrafluoroethylene/polyethene oxide (PTFE/PEO) membranes were fabricated, followed by a sintering process to obtain pure PTFE fibrous membranes, which were further utilized against a polyamide 6 (PA6) membrane for vertical contact-mode triboelectric nanogenerators (TENGs). Electrostatic force microscopy (EFM) measurements of the sintered electrospun PTFE membranes revealed the presence of both positive and negative surface charges owing to the transfer of positive charge from PEO which was further corroborated by FTIR measurements. To enhance the ensuing triboelectric surface charge, a facile negative charge-injection process was carried out onto the electrospun (ES) PTFE subsequently. The fabricated TENG gave a stabilized peak-to-peak open-circuit voltage (V) of up to ∼900 V, a short-circuit current density (J) of ∼20 mA m, and a corresponding charge density of ∼149 μC m, which are ∼12, 14, and 11 times higher than the corresponding values prior to the ion-injection treatment. This increase in the surface charge density is caused by the inversion of positive surface charges with the simultaneous increase in the negative surface charge on the PTFE surface, which was confirmed by using EFM measurements. The negative charge injection led to an enhanced power output density of ∼9 W m with high stability as confirmed from the continuous operation of the ion-injected PTFE/PA6 TENG for 30 000 operation cycles, without any significant reduction in the output. The work thus introduces a relatively simple, cost-effective, and environmentally friendly technique for fabricating fibrous fluoropolymer polymer membranes with high thermal/chemical resistance in TENG field and a direct ion-injection method which is able to dramatically improve the surface negative charge density of the PTFE fibrous membranes.

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Preparation, characterization, and applications of electrospun ultrafine fibrous PTFE porous membranes

Cited by 120 publications

References 21 publications

Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

Transport Properties of Electro-Sprayed Polytetrafluoroethylene Fibrous Layer Filled with Aerogels/Phase Change Materials

Emulsion Electrospinning of Polytetrafluoroethylene (PTFE) Nanofibrous Membranes for High-Performance Triboelectric Nanogenerators

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