Polytetrafluoroethylene Sputtered PES Membranes for Membrane Distillation: Influence of RF Magnetron Sputtering Conditions

Pedram, Sara; Mortaheb, Hamid Reza; Fakhouri, Houssam; Arefi‐Khonsari, Farzaneh

doi:10.1007/s11090-016-9769-3

Cited by 12 publications

(7 citation statements)

References 56 publications

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“…Further, the redeposition of the fluorocarbon species from the sacrificial PTFE disc onto the sample also contributes to the formation of C−CF x and CF bonds on the surface. [24,44,45] Also, energetic Ar ion irradiation breaks the polymer chain and creates lots of free radicals. Hence, when the surface is exposed to an ambient environment, the O/C ratio increases from 0.02 to 0.3 due to the post-plasma auto-oxidation of polymer fragments created on the surface after plasma treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Even though PTFE is chemically inert, when exposed to the various gaseous plasma, apart from the morphological changes, severe chemical composition changes are also taken place on the surface. Depending upon the feed gas, several chemical changes such as defluorination, [19,20] chain scission, [21] crosslinking, [22][23][24][25] and post-plasma auto-oxidation [26] are reported by various research groups. For instance, Vesel et al [20] studied the defluorination of PTFE using hydrogen plasma and found that the F/C ratio decreased from 2.0 to 0.2.…”

Section: Introductionmentioning

confidence: 99%

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Hydrophobic to superhydrophobic and hydrophilic transitions of Ar plasma‐nanostructured PTFE surfaces

Pachchigar

Gaur

Amrutha

et al. 2022

Plasma Processes & Polymers

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Production of superhydrophobic polytetrafluoroethylene (PTFE) by Ar plasma etching is challenging as it leads to defluorination, resulting in a hydrophilic surface. The effect of radiofrequency power, treatment time, impurity, and surface temperature on Ar plasma‐treated PTFE was investigated for producing a large‐area superhydrophobic PTFE surface. To avoid impurity and substrate temperature effects, a single electrode‐based arrangement with a sacrificial PTFE disc behind the specimen was used for plasma discharge. After 5 min treatment at 100 W, the surface became superhydrophobic (water contact angle = 156°) due to the formation of isotropic nanostructures. However, 30 min of plasma treatment caused severe chemical changes resulting in a hydrophilic surface (water contact angle = 14°). A yellowish layer was formed on the surface due to crosslinking, redeposition of fluorocarbon species, and iron impurities from the plasma system confirmed by X‐ray photoelectron spectroscopy analysis.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrophobic to superhydrophobic and hydrophilic transitions of Ar plasma‐nanostructured PTFE surfaces

Pachchigar

Gaur

Amrutha

et al. 2022

Plasma Processes & Polymers

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“…Similarly, Yang et al [64] were able to obtain a superhydrophobic PVDF membrane exhibiting a contact angle of 162.4 • by CF 4 plasma treatment. Pedram et al [65] designed thin films of fluorocarbon which were deposited on PES membranes through argon plasma sputtering of PTFE targeted in RF magnetron plasma reactor. Recently, Woo et al [66] prepared PVDF membrane via electrospinning and treated the surface with CF 4 plasma.…”

Section: Surface Engineeringmentioning

confidence: 99%

Membrane Distillation: Recent Configurations, Membrane Surface Engineering, and Applications

Parani

Oluwafemi

2021

Membranes

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Membrane distillation (MD) is a developing membrane separation technology for water treatment that involves a vapor transport driven by the vapor pressure gradient across the hydrophobic membrane. MD has gained wide attention in the last decade for various separation applications, including the separation of salts, toxic heavy metals, oil, and organic compounds from aqueous solutions. Compared with other conventional separation technologies such as reverse osmosis, nanofiltration, or thermal distillation, MD is very attractive due to mild operating conditions such as low temperature and atmospheric pressure, and 100% theoretical salt rejection. In this review, membrane distillation’s principles, recent MD configurations with their advantages and limitations, membrane materials, fabrication of membranes, and their surface engineering for enhanced hydrophobicity are reviewed. Moreover, different types of membrane fouling and their control methods are discussed. The various applications of standalone MD and hybrid MD configurations reported in the literature are detailed. Furthermore, studies on the MD-based pilot plants installed around the world are covered. The review also highlights challenges in MD performance and future directions.

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“…This approach provides membranologists with the freedom to independently design and optimize the layers while the self-termination of IP led to ultrathin skin that is <200 nm [8,9]. Apart from IP, many techniques such as dip-coating [10], spin-coating [11], layer-by-layer [12,13], grafting [14], chemical vapor deposition [15], surface growth/crystallization [16,17] and sputter-coating [17,18] have been devised for the fabrication of TFC. A polymeric membrane with anisotropic structure continues to be the model for many commercial membranes available today.…”

Section: Introductionmentioning

confidence: 99%

The State-of-the-Art Functionalized Nanomaterials for Carbon Dioxide Separation Membrane

et al. 2022

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Nanocomposite membrane (NCM) is deemed as a practical and green separation solution which has found application in various fields, due to its potential to delivery excellent separation performance economically. NCM is enabled by nanofiller, which comes in a wide range of geometries and chemical features. Despite numerous advantages offered by nanofiller incorporation, fabrication of NCM often met processing issues arising from incompatibility between inorganic nanofiller and polymeric membrane. Contemporary, functionalization of nanofiller which modify the surface properties of inorganic material using chemical agents is a viable approach and vigorously pursued to refine NCM processing and improve the odds of obtaining a defect-free high-performance membrane. This review highlights the recent progress on nanofiller functionalization employed in the fabrication of gas-separative NCMs. Apart from the different approaches used to obtain functionalized nanofiller (FN) with good dispersion in solvent and polymer matrix, this review discusses the implication of functionalization in altering the structure and chemical properties of nanofiller which favor interaction with specific gas species. These changes eventually led to the enhancement in the gas separation efficiency of NCMs. The most frequently used chemical agents are identified for each type of gas. Finally, the future perspective of gas-separative NCMs are highlighted.

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Polytetrafluoroethylene Sputtered PES Membranes for Membrane Distillation: Influence of RF Magnetron Sputtering Conditions

Cited by 12 publications

References 56 publications

Hydrophobic to superhydrophobic and hydrophilic transitions of Ar plasma‐nanostructured PTFE surfaces

Hydrophobic to superhydrophobic and hydrophilic transitions of Ar plasma‐nanostructured PTFE surfaces

Membrane Distillation: Recent Configurations, Membrane Surface Engineering, and Applications

The State-of-the-Art Functionalized Nanomaterials for Carbon Dioxide Separation Membrane

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