PTFE porous membrane technology: A comprehensive review

Guo, Qiang; Huang, Yan; Xu, Min; Huang, Qinglin; Cheng, Jinxue; Yu, Shiwen; Zhang, Yuxin; Xiao, Changfa

doi:10.1016/j.memsci.2022.121115

Cited by 63 publications

(24 citation statements)

References 194 publications

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“…[ 37,39–42 ] Fluorinated polymers (PTFE, PVDF, and CYTOP) may also act as fluorinating agents. [ 43–47 ]…”

Section: Fluorination Of Porous Carbonaceous Materialsmentioning

confidence: 99%

“…[37,[39][40][41][42] Fluorinated polymers (PTFE, PVDF, and CYTOP) may also act as fluorinating agents. [43][44][45][46][47] Nevertheless, even if this fluorination route has proven to be very efficient and reliable, the costs of both the solid fluorinating agents and the thermal process (for the decomposition and release of fluorine species) hinder its use at an industrial scale.…”

Section: Indirect Fluorination Using Fluorinating Reagentsmentioning

confidence: 99%

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Fluorination and its Effects on Electrocatalysts for Low‐Temperature Fuel Cells

Chatenet

Berthon‐Fabry

Ahmad

et al. 2023

Advanced Energy Materials

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The benefits of covalent grafting of fluorine atoms onto carbonaceous materials are described for the design of new electrocatalysts for low‐temperature fuel cells. In order to obtain the best results, the fluorination conditions must be carefully chosen according to the physicochemical properties of the starting materials (specific surface area, pore size distribution, crystallinity, and doping). By describing the main fluorination routes, the article aims to help in the choice of efficient treatment conditions. The effects of fluorination on the performance of the platinum group metal (PGM)‐based catalyst and the non‐PGM‐based electrocatalyst are discussed. Finally, future research prospects and technical challenges of fluorination for fuel cells are proposed.

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“…[ 37,39–42 ] Fluorinated polymers (PTFE, PVDF, and CYTOP) may also act as fluorinating agents. [ 43–47 ]…”

Section: Fluorination Of Porous Carbonaceous Materialsmentioning

confidence: 99%

Section: Indirect Fluorination Using Fluorinating Reagentsmentioning

confidence: 99%

Fluorination and its Effects on Electrocatalysts for Low‐Temperature Fuel Cells

Chatenet

Berthon‐Fabry

Ahmad

et al. 2023

Advanced Energy Materials

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“…However, porous PTFE membranes are challenging to fabricate by common phase inversion or melt spinning methods 10 because PTFE has high melt viscosity, negligible solubility which makes it difficult to process using conventional processing techniques 3,6,13 . Due to its specific processing needs, stretching, sintering, wrapping, electrospinning, and near field electrospinning methods can be employed in the fabrication of PTFE membranes 14 . But PTFE expansion and sintering processes remain the main commercial techniques for the manufacture of porous PTFE membranes 15–17 .…”

Section: Introductionmentioning

confidence: 99%

“…Expansion process involves extrusion, followed by stretching to form microporous films. These expanded PTFE membranes are called e‐PTFE membranes are usually prepared by uniaxial or biaxial stretching 13,14,19 to achieve a higher specific surface area, which provides high gas permeability and more contact area between the particles and fibers, while providing sufficient particle retention 5 . However, the stretching technologies generally suffered from wide pore size distribution, low porosity at small thickness of membranes 20 .…”

Section: Introductionmentioning

confidence: 99%

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Preparation and comparison of electrospunPEO/PTFEandPVA/PTFEnanofiber membranes for syringe filters

Akduman

2023

J of Applied Polymer Sci

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The fabrication of a high‐performance PTFE membrane remains challenging and still under interest. Electrospinning is one of the possible fabrication methods for PTFE membranes. But, due to the high solvent resistance and the high melt viscosity, PTFE emulsion should be blended with a carrier polymer solution and then it can be electrospinned. In this study, PTFE membranes were produced with four different ratios of PVA and PEO polymers as carrier and then sintered at 380°C, to left only PTFE nanofibers behind. Produced hydrophobic PTFE membranes' WCA values were between 120‐132° for PEO/PTFE nanofibers and 112‐124° for PVA/PTFE nanofibers. SEM images revealed that PEO/PTFE membranes preserved their fibrous structure better. After sintering, diameter of 7PEO/PTFE, 8PEO/PTFE, 9PEO/PTFE, and 10PEO/PTFE nanofibers were 612, 818, 822, and 923 nm, respectively. Only 30PVA/PTFE nanofibers showed some fiber structure after sintering with evenly distributed pores. PEO/PTFE membranes were thicker than commercial syringe filter membranes and PVA/PTFE membranes and was about 0.24 μm. Although mean pore size measurements of both PEO/PTFE and PVA/PTFE membranes were 0.90 and 1.07 μm, respectively and higher than commercial membranes, bacterial removal tests of PEO/PTFE membrane were promising and close to commercial syringe filter results with 1.3 3log CFU/mL.

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Hydrovoltaic energy from water droplets: Device configurations, mechanisms, and applications

Li,

Wang,

Deng

et al. 2023

Droplet

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Water, the source of life, contains immense energy and manifests in diverse forms. Hydrovoltaic technology enables the direct interaction between water and materials to generate electricity, a vital necessity for industry modernization. Due to the ubiquitous presence and easy availability of falling water, hydrovoltaic energy derived from water droplets has attracted considerable attention and shown great potential in raindrop energy harvesting. In this review, a comprehensive summary of the latest advancements in harvesting hydrovoltaic energy from water droplets is presented, with a focus on the configurations and underlying mechanisms of hydrovoltaic devices. Additionally, a brief discussion on the applications of droplet‐based hydrovoltaic devices is presented, along with future prospects for this energy‐harvesting technology.

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PTFE porous membrane technology: A comprehensive review

Cited by 63 publications

References 194 publications

Fluorination and its Effects on Electrocatalysts for Low‐Temperature Fuel Cells

Fluorination and its Effects on Electrocatalysts for Low‐Temperature Fuel Cells

Preparation and comparison of electrospunPEO/PTFEandPVA/PTFEnanofiber membranes for syringe filters

Hydrovoltaic energy from water droplets: Device configurations, mechanisms, and applications

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