Amphiphobic electrospun PTFE nanofibrous membranes for robust membrane distillation process

Omniphobic, Bilayer Carbon Nanotube-Immobilized Fluorinated (FAS) Membranes for Bioethanol Recovery at High Concentrations via Membrane Distillation

“…The effective surface porosity over the pore length was measured by a gas permeation test , and was important for studying mass transfer pathways in the membrane . From the gas permeation test, the effective surface porosity over pore length ( ∈ L normalp ) of PTFE (PTFE 0.5 μm), FAS-IM, and FAS-CNIM were found 9.15 × 107, 3.70 × 107, and 9.38 × 105, respectively, which implied that the effective porosity over pore length was decreased after modification. , The FAS coating did not change porosity over pore length significantly; however, the FAS-CNIM prepared through CNT immobilization and FAS coating led to significant decrease.…”

“…The overall membrane porosity was calculated from the ratio of the volume of the pores divided by the total volume of the porous membrane as previously reported in other similar studies. , It can usually be calculated experimentally using the gravimetric method, determining the weight of highly wetting liquid contained in the preweighed membrane sample. ,− The membrane samples were then immersed in n -butyl alcohol for 48 h, and their size and thickness of membrane sample were measured using a digital thickness gauge. The thickness of the membranes for PTFE, FAS-IM, and FAS-CNIM was determined to be 130 ± 1, 138 ± 2, and 153 ± 1 μm, respectively.…”

Effective Membrane Distillation of Landfill Leachate Concentrate Using a Superhydrophobic SiO2/PVDF Membrane for Resource Recovery

“…Moreover, Xu et al developed an electrospinning PTFE nanofibrous membrane for robust membrane distillation. 46 The fabricated PTFE membrane exhibited an unexceptionable amphiphobicity, reflected by an oil contact angle of 134.5°and a water contact angle of 166.9°even under harsh conditions. Recently, we reported a durable superhydrophobic PVDF membrane designed by facile spray-coating of fluorinated SiO 2 nanoparticles.…”

“…This modified superhydrophobic membrane (water contact angle of 152.2°) can achieve 99.99% salt rejection for desalination of the high salinity water via membrane distillation. Moreover, Xu et al developed an electrospinning PTFE nanofibrous membrane for robust membrane distillation . The fabricated PTFE membrane exhibited an unexceptionable amphiphobicity, reflected by an oil contact angle of 134.5° and a water contact angle of 166.9° even under harsh conditions.…”

Durable Polyurethane/SiO2 Nanofibrous Membranes by Electrospinning for Waterproof and Breathable Textiles

“…The well-recognized polytetrafluoroethylene (PTFE) microporous membrane, as a representative waterproof and breathable membrane, exhibits a high water vapor transmission rate and high waterproofness. PTFE has been commercialized and is generally applied in waterproof and breathable outdoor clothing and other fields. − However, PTFE microporous membranes still have some unresolved shortcomings, such as their poor resilience and troubling biological and environmental hazards. , Polyurethane (PU) has excellent elastic properties, which can solve the low elasticity problem of traditional PTFE microporous membranes and exhibit good application prospects in the direction of environmental protection. − Therefore, PU membranes have gradually become a research hotspot for waterproof and breathable textiles in recent years.…”