A systematic study of the impact of hydrophobicity on the wetting of MD membranes

Servi, Amelia; Kharraz, Jehad A.; Klee, David; Notarangelo, Katie; Eyob, Brook; Guillén-Burrieza, Elena; Liu, Andong; Arafat, Hassan A.; Gleason, Karen K.

doi:10.1016/j.memsci.2016.08.021

Cited by 73 publications

(52 citation statements)

References 31 publications

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“…The high hydrophobicity of keratin NFMs could reinforce their stability in water suggesting also other potential applications in membrane distillation (MD) , venting, adsorption of VOCs, and the separation of oils from oil/water emulsions . In particular, MD is a thermally driven membrane separation technology based on the use of hydrophobic microfiltration membranes separating liquids at different temperatures.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of electrospun keratin nanofiber membranes for air and water treatment

Figoli

Ursino

Ramírez

et al. 2019

Polymer Engineering & Sci

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Keratin proteins extracted from wool fibers by sulfitolysis were electrospun for the production of active nanofiber membranes (NFMs). The keratin NFMs were composited with nylon woven fabric for improving their mechanical properties as a filtration material. The prepared membranes were characterized in terms of morphology, pore size, contact angle, and performance of water and air permeability. Experimental data showed that most of investigated parameters were affected by the electrospinning time: that is, roughness rose by increasing the electrospinning time, while the narrowest pore size distribution was obtained at the longest electrospinning time (2 h). The pure water permeability (PWP) was greater for the produced NFMs than for the commercial microfiltration membranes and decreased by increasing the electrospinning time. At the longest electrospinning time, the produced NFMs showed a PWP of about 45.7 m3/m2 h bar, which is a value greater than those obtained by conventional materials used in water filtration, including microfiltration membranes. According to the data of contact angle measurements, the high hydrophobicity of NFMs membranes could reinforce their stability in water. Other potential applications could be venting, adsorption of VOCs, and separation of oils from oil/water emulsions. POLYM. ENG. SCI., 59:1472–1478 2019. © 2019 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Fabrication of electrospun keratin nanofiber membranes for air and water treatment

Figoli

Ursino

Ramírez

et al. 2019

Polymer Engineering & Sci

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“…iCVD has been used previously to prepare hydrophobic membranes for MD and other applications [12,16,[20][21][22]. A defining characteristic of iCVD coatings is the ability to make them ultra-thin (~10 nm) and the ability to tune their conformality.…”

Section: Overview Of Icvd Film Thickness and Conformalitymentioning

confidence: 99%

“…Total membrane thickness was 24 µm. Pore density was 1.5×10 12 pores/m 2 . We used initiated chemical vapor deposition (iCVD) [26] as a method to deposit a hydrophobic coating on the PCTE membranes.…”

Section: Membrane Preparationmentioning

confidence: 99%

“…Liquid entry pressure (LEP) was measured using a custom system similar to ones used previously [12,16,31,32]. A pristine sample of the membrane was held in a 13 mm syringe membrane holder (GE healthcare biosciences).…”

Section: Contact Angle Liquid Entry Pressure and Permeate Gap Membrmentioning

confidence: 99%

“…However, experimental, higher performance MD membranes are often prepared. Many of these membranes consist of a hydrophilic or hydrophobic base membrane coated with a low surface-energy chemistry to increase liquid entry pressure [11][12][13][14][15][16]. This versatile method increases the options for base membranes and surface chemistries, making it possible to produce higher performance membranes.…”

Section: Introductionmentioning

confidence: 99%

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The effects of iCVD film thickness and conformality on the permeability and wetting of MD membranes

Servi

Guillén-Burrieza²,

Warsinger

et al. 2017

Journal of Membrane Science

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Membranes possessing high permeability to water vapor and high liquid entry pressure (LEP) are necessary for efficient membrane distillation (MD) desalination. A common technique to prepare specialized MD membranes consists of coating a hydrophilic or hydrophobic base membrane with a low surface-energy material. This increases its liquid entry pressure, making the membrane suitable for MD. However, in addition to increasing LEP, the surface-coating may also decrease permeability of the membrane by reducing its average pore size. In this study, we quantify the effects of initiated chemical vapor deposition (iCVD) polymer coatings on membrane permeability and LEP. We consider whether the iCVD films should have minimized thickness or maximized non-conformality, in order to maximize the permeability achieved for a given value of LEP. We determined theoretically that permeability of a single pore is maximized with a highly non-conformal iCVD coating. However, the overall permeability of a membrane consisting of many pores is maximized when iCVD film thickness is minimized. We applied the findings experimentally, preparing an iCVD-treated track-etched polycarbonate (PCTE) membrane and testing it in a permeate gap membrane distillation (PCMD) system. This study focuses on membranes with clearly defined, cylindrical pores. However, we believe that the principles we discuss will extend to membranes with more complex pore architectures. Overall, this work indicates that the focus of surface-coating development should be on minimizing film thickness, not on increasing their non-conformality. Keywords: Membrane distillation (MD), Desalination, Track-etched polycarbonate (PCTE) membranes, Dusty gas model, Initiated chemical vapor deposition (iCVD). SLStep coverage of the iCVD coating, can be written as = S(x)Step coverage of the iCVD coating within the membrane, written as =

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Computational Fluid Dynamics (CFD) Modeling in Membrane‐Based Desalination Technologies

Yazgan‐Birgi

Ali

Arafat

2020

Modeling in Membranes and Membrane‐Based Processes

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A systematic study of the impact of hydrophobicity on the wetting of MD membranes

Cited by 73 publications

References 31 publications

Fabrication of electrospun keratin nanofiber membranes for air and water treatment

Fabrication of electrospun keratin nanofiber membranes for air and water treatment

The effects of iCVD film thickness and conformality on the permeability and wetting of MD membranes

Computational Fluid Dynamics (CFD) Modeling in Membrane‐Based Desalination Technologies

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