Surface-patterning of polymeric membranes: fabrication and performance

Heinz, Özge; Aghajani, Masoud; Greenberg, Alan R.; Ding, Yifu

doi:10.1016/j.coche.2018.01.008

Cited by 100 publications

(73 citation statements)

References 94 publications

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“…On the other hand, Chen et al noticed that membranes with lower surface roughness and higher peak count exhibited the fastest fouling potential for soluble microbial products. The lower fouling of rougher membranes could be also explained in terms of turbulence promoters . When the flow is more turbulent, in the vicinity of the surface, fluid shear and flow confinement cause hydrodynamic lift forces, which transport particles or molecules back into the bulk of the fluid .…”

Section: Resultssupporting

confidence: 85%

Influence of Ag/titanate nanotubes on physicochemical, antifouling and antimicrobial properties of mixed‐matrix polyethersulfone ultrafiltration membranes

Mozia

Sienkiewicz

Szymański

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: One of the main drawbacks of membrane processes is (bio)fouling. Recent attempts to overcome these phenomena focus on incorporation of nanoparticles into polymeric membrane matrices. This paper presents an investigation of the influence of modification of polyethersulfone (PES) ultrafiltration membranes with Ag/titanate nanotubes (Ag/TNTs) on physicochemical characteristics, water permeability and antifouling and antibacterial properties.RESULTS: The modified membranes were prepared via a wet phase inversion method by adding 0.1-1.5 wt% of Ag/TNTs relative to PES into the casting solution. An increase of water permeability with increasing Ag/TNTs content up to 1 wt% was found. The modification contributed to fouling mitigation during ultrafiltration of humic acids solution due to (i) improved hydrophilicity, (ii) presence of Ag/TNTs turbulence promoters and (iii) negative surface charge of the membranes. A correlation between membrane surface roughness, zeta potential and proneness to fouling is discussed. The highest inhibition of bacterial growth, reaching 99.8 and 99.3% for Escherichia coli and Staphylococcus epidermidis, respectively, was observed at the highest Ag/TNTs content. CONCLUSIONS:The introduction of Ag/TNTs into PES membrane structures improved membrane permeability, fouling resistance and antibacterial properties. The most significant improvement was observed in the case of membranes containing the largest quantities of Ag/TNTs. density of polyethersulfone (g mL −1 ) w density of water at 20 ∘ C (g mL −1 )

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Section: Resultssupporting

confidence: 85%

Influence of Ag/titanate nanotubes on physicochemical, antifouling and antimicrobial properties of mixed‐matrix polyethersulfone ultrafiltration membranes

Mozia

Sienkiewicz

Szymański

et al. 2019

J of Chemical Tech & Biotech

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“…These T g values are well within the range (190 °C–290 °C) of PS f and polyethersulfone (PES), common support materials for TFC membranes [27]. It has been previously shown that compressing the porous supports at temperatures above the T g of the polymer leads to detrimental pore-sealing [28] due to viscous flow of the polymer. Therefore, all NIL compression experiments were conducted within the range of 40 °C–150 °C, which is well below the T g of the membranes.…”

Section: Resultsmentioning

confidence: 53%

Influence of support-layer deformation on the intrinsic resistance of thin film composite membranes

Aghajani

Wang

Cox

et al. 2018

Journal of Membrane Science

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It is commonly believed that the overall permeation resistance of thin film composite (TFC) membranes is dictated by the crosslinked, ultrathin polyamide barrier layer, while the porous support merely serves as the mechanical support. Although this assumption might be the case under low transmembrane pressure, it becomes questionable under high transmembrane pressure. A highly porous support normally yields under a pressure of a few MPa, which can result in a significant level of compressive strain that may significantly increase the resistance to permeation. However, quantifying the influence of porous support deformation on the overall resistance of the TFC membrane is challenging. In particular, it is difficult to determine the deformation/strain of the membrane during active separation. In this study, we use nanoimprint lithography (NIL) to achieve precise compressive deformation in commercial TFC membranes. By adjusting the NIL conditions, membranes were compressed to strain levels up to 60%. SEM and AFM measurements showed that the compression had minimal impact on the barrier-layer surface morphology and total surface area with most of the deformation occurring in the support layer. DI water permeation measurements revealed that the water flux reduction decreases with an increase of strain level. Most significantly, the intrinsic membrane resistance showed negligible changes at strain levels lower than 30%–40%, but increased exponentially at higher strain levels, reaching 250%–500% of pristine (unstrained) membrane values. Using a resistance-in-series model, the strain dependency of the TFC membrane resistance can be described.

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“…Therefore, researchers are focusing on simplifying and inventing new strategies of fouling control. Fouling can be mitigated by controlling physical and chemical interactions between foulant materials in the feed solution and on the membrane surface [24,25].…”

Section: Introductionmentioning

confidence: 99%

Membrane Surface Patterning as a Fouling Mitigation Strategy in Liquid Filtration: A Review

et al. 2019

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Membrane fouling is seen as the main culprit that hinders the widespread of membrane application in liquid-based filtration. Therefore, fouling management is key for the successful implementation of membrane processes, and it is done across all magnitudes. For optimum operation, membrane developments and surface modifications have largely been reported, including membrane surface patterning. Membrane surface patterning involves structural modification of the membrane surface to induce secondary flow due to eddies, which mitigate foulant agglomeration and increase the effective surface area for improved permeance and antifouling properties. This paper reviews surface patterning approaches used for fouling mitigation in water and wastewater treatments. The focus is given on the pattern formation methods and their effect on overall process performances.

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Surface-patterning of polymeric membranes: fabrication and performance

Cited by 100 publications

References 94 publications

Influence of Ag/titanate nanotubes on physicochemical, antifouling and antimicrobial properties of mixed‐matrix polyethersulfone ultrafiltration membranes

Influence of Ag/titanate nanotubes on physicochemical, antifouling and antimicrobial properties of mixed‐matrix polyethersulfone ultrafiltration membranes

Influence of support-layer deformation on the intrinsic resistance of thin film composite membranes

Membrane Surface Patterning as a Fouling Mitigation Strategy in Liquid Filtration: A Review

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