Polymeric Slippery Coatings: Nature and Applications

Samaha, Mohamed A.; Gad‐el‐Hak, Mohamed

doi:10.3390/polym6051266

Cited by 41 publications

(19 citation statements)

References 111 publications

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“…This qualitative comparison is supported by the consideration of the chemical similarity between keratin and Nylon 6.6, as both of them are polyamides. Moreover, the result is in accordance with the literature . A further increase in CAw (up to 20°) was reached at longer electrospinning time mainly due to the beads density increase in NFMs, which caused an increase of the membrane roughness .…”

Section: Resultssupporting

confidence: 91%

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: Resultssupporting

confidence: 91%

Fabrication of electrospun keratin nanofiber membranes for air and water treatment

Figoli

Ursino

Ramírez

et al. 2019

Polymer Engineering & Sci

View full text Add to dashboard Cite

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“…The low value of contact angle hysteresis Δθ = θa−θr, where θa represents advancing contact angle and θr is the receding contact angle (the actual measured Δθ = 3.0° to 4.5°), proved the ability of BSO to prevent the adhesion of water droplet on the substrate. This may refer to combination of the effect of surface tension of BSO and surface free energy of electrospun fiber mats acting as a repellence layer for water [ 33 , 68 ]. Observations revealed highly appreciable slippery behavior for PE and PU modified by PDMS/PA/BSO.…”

Section: Resultsmentioning

confidence: 99%

Slippery Liquid-Infused Porous Polymeric Surfaces Based on Natural Oil with Antimicrobial Effect

et al. 2021

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Many polymer materials have found a wide variety of applications in biomedical industries due to their excellent mechanical properties. However, the infections associated with the biofilm formation represent serious problems resulting from the initial bacterial attachment on the polymeric surface. The development of novel slippery liquid-infused porous surfaces (SLIPSs) represents promising method for the biofilm formation prevention. These surfaces are characterized by specific microstructural roughness able to hold lubricants inside. The lubricants create a slippery layer for the repellence of various liquids, such as water and blood. In this study, effective antimicrobial modifications of polyethylene (PE) and polyurethane (PU), as commonly used medical polymers, were investigated. For this purpose, low-temperature plasma treatment was used initially for activation of the polymeric surface, thereby enhancing surface and adhesion properties. Subsequently, preparation of porous microstructures was achieved by electrospinning technique using polydimethylsiloxane (PDMS) in combination with polyamide (PA). Finally, natural black seed oil (BSO) infiltrated the produced fiber mats acting as a lubricating layer. The optimized fiber mats’ production was achieved using PDMS/PA mixture at ratio 1:1:20 (g/g/mL) using isopropyl alcohol as solvent. The surface properties of produced slippery surfaces were analyzed by various microscopic and optics techniques to obtain information about wettability, sliding behavior and surface morphology/topography. The modified PE and PU substrates demonstrated slippery behavior of an impinged water droplet at a small tilting angle. Moreover, the antimicrobial effects of the produced SLIPs using black seed oil were proven against Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli).

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“…They ensure that the water droplets move quickly and hence decrease the water sliding angles of the membrane. Further, the presence of pocket-like cells creates a resistance to heat transfer, which helps maintain a high temperature in the feed side, ensuring a higher vapor pressure gradient, thus increasing the water flux of the MD membrane [ 89 , 90 ]. Figure 8 demonstrates the effects of air pockets that result in superhydrophobicity and anti-wetting properties.…”

Section: Incorporation Of Nanomaterials For Enhanced Performancementioning

confidence: 99%

Recent Developments in Nanomaterials-Modified Membranes for Improved Membrane Distillation Performance

et al. 2020

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Membrane distillation (MD) is a thermally induced membrane separation process that utilizes vapor pressure variance to permeate the more volatile constituent, typically water as vapor, across a hydrophobic membrane and rejects the less volatile components of the feed. Permeate flux decline, membrane fouling, and wetting are some serious challenges faced in MD operations. Thus, in recent years, various studies have been carried out on the modification of these MD membranes by incorporating nanomaterials to overcome these challenges and significantly improve the performance of these membranes. This review provides a comprehensive evaluation of the incorporation of new generation nanomaterials such as quantum dots, metalloids and metal oxide-based nanoparticles, metal organic frameworks (MOFs), and carbon-based nanomaterials in the MD membrane. The desired characteristics of the membrane for MD operations, such as a higher liquid entry pressure (LEPw), permeability, porosity, hydrophobicity, chemical stability, thermal conductivity, and mechanical strength, have been thoroughly discussed. Additionally, methodologies adopted for the incorporation of nanomaterials in these membranes, including surface grafting, plasma polymerization, interfacial polymerization, dip coating, and the efficacy of these modified membranes in various MD operations along with their applications are addressed. Further, the current challenges in modifying MD membranes using nanomaterials along with prominent future aspects have been systematically elaborated.

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Polymeric Slippery Coatings: Nature and Applications

Cited by 41 publications

References 111 publications

Fabrication of electrospun keratin nanofiber membranes for air and water treatment

Fabrication of electrospun keratin nanofiber membranes for air and water treatment

Slippery Liquid-Infused Porous Polymeric Surfaces Based on Natural Oil with Antimicrobial Effect

Recent Developments in Nanomaterials-Modified Membranes for Improved Membrane Distillation Performance

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