Influence of bore fluid composition on the physiochemical properties and performance of hollow fiber membranes for ultrafiltration

Bang, Yuna; Obaid, M.; Jang, Mijung; Lee, Jangho; Lim, Joohwan; Kim, In Soo

doi:10.1016/j.chemosphere.2020.127467

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…Hollow fibers are generally fabricated by using the dry-jet wet spinning technique. The structure, morphology, outer and inner diameters, wall thickness of hollow fibers were significantly influenced by the fabrication parameters, e.g., air gap length, bore fluid, dope composition and flow rates of dope and bore fluid [7,[11][12][13][14]. Hasbullah et al [12] found that the wall thickness of polyaniline (PAni) hollow fiber decreased while the skin layer thickness increased when the air gap length increased.…”

Section: Introductionmentioning

confidence: 99%

The Effects of PEI Hollow Fiber Substrate Characteristics on PDMS/PEI Hollow Fiber Membranes for CO2/N2 Separation

Kujawski

Knozowska

et al. 2021

Membranes

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The CO2 separation from flue gas based on membrane technology has drawn great attention in the last few decades. In this work, polyetherimide (PEI) hollow fibers were fabricated by using a dry-jet-wet spinning technique. Subsequently, the composite hollow fiber membranes were prepared by dip coating of polydimethylsiloxane (PDMS) selective layer on the outer surface of PEI hollow fibers. The hollow fibers spun from various spinning conditions were fully characterized. The influence of hollow fiber substrates on the CO2/N2 separation performance of PDMS/PEI composite membranes was estimated by gas permeance and ideal selectivity. The prepared composite membrane where the hollow fiber substrate was spun from 20 wt% of dope solution, 12 mL/min of bore fluid (water) flow rate exhibited the highest ideal selectivity equal to 21.3 with CO2 permeance of 59 GPU. It was found that the dope concentration, bore fluid flow rate and bore fluid composition affect the porous structure, surface morphology and dimension of hollow fibers. The bore fluid composition significantly influenced the gas permeance and ideal selectivity of the PDMS/PEI composite membrane. The prepared PDMS/PEI composite membranes possess comparable CO2/N2 separation performance to literature ones.

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Section: Introductionmentioning

confidence: 99%

The Effects of PEI Hollow Fiber Substrate Characteristics on PDMS/PEI Hollow Fiber Membranes for CO2/N2 Separation

Kujawski

Knozowska

et al. 2021

Membranes

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“…As a plasticizer, GI can affect the stability of the internal structure of polymer materials, resulting in changes in tensile strength . With the increase of the GI ratio, the Young’s modulus of the NRL-GI film gradually decreases, as shown in Figure A,C, indicating that the softness of the NRL-GI film gradually increases.…”

Section: Resultsmentioning

confidence: 95%

“…As a plasticizer, GI can affect the stability of the internal structure of polymer materials, resulting in changes in tensile strength. 33 With the increase of the GI ratio, the Young's modulus of the NRL-GI film gradually decreases, as shown in Figure 1A,C, indicating that the softness of the NRL-GI film gradually increases. When the GI ratio is less than 10%, the morphological characteristics of the NRL-GI film are relatively stable, and the tensile force is easier to be measured.…”

Section: ■ Introductionmentioning

confidence: 93%

Glycerol and Antimicrobial Peptide-Modified Natural Latex for Bacteriostasis of Skin Wounds

Wang

et al. 2022

ACS Omega

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This work aimed to develop a glycerol antimicrobial peptide natural latex film (NRL-GI-AMP film) for the treatment of skin wound infections. The contents of this work mainly include investigating the effect of adding glycerol (GI) and an antimicrobial peptide (AMP) on the physical and chemical properties of natural latex (NRL) and analyzing the cytocompatibility, bacteriostatic activity, and infected wound healing promotion of the NRL-GI-AMP film. The results showed that the addition of GI resulted in more pores in the internal structure of the NRL film, while the addition of G(LLKK)3L AMP did not change the structure and properties of the NRL film. Compared with that of the NRL film, the infrared spectrum of the NRL-GI-AMP film did not produce new characteristic peaks, indicating that GI and AMP were non-covalently cross-linked with NRL. Addition of 10% GI reduces the toughness of the NRL-GI-AMP film by 62.0%, increases the water vapor transmission rate by 8.95 mg/(cm2·h), and reduces the water absorption and water retention distributions by 33.0 and 24.7%, respectively. AMP in the NRL-GI-AMP film could be released continuously for 40 h, and the release rate was about 45%. The NRL-GI-AMP film showed good biocompatibility and antibacterial activity and promoted the healing of infected wounds. Therefore, the NRL-GI-AP film has potential application in the development of dressings to inhibit skin wound infection and promote wound healing.

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“…[34,37] Using a bore fluid with pure nonsolvent only, typically leads to the formation of a dense and smooth lumen channel surface. [38,39] In contrast, the addition of a solvent or additives such as ethylene glycol or glycerol to the bore fluid decreases the phase inversion kinetics and a rough surface layer with fewer defects forms. [33,40] Furthermore, additives in the bore fluid such as glycerol increase the fluid viscosity and minimize the collapsing of the tubular membrane.…”

Section: Resultsmentioning

confidence: 99%

Polyelectrolyte Complex Tubular Membranes via a Salt Dilution Induced Phase Inversion Process

et al. 2021

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Tubular membrane geometries are key elements of many industrial filtration applications and artificial organs. Established processes to fabricate polymeric membranes require the use of organic solvents, which are prone to be phased out due to stricter regulations. In the quest of developing solvent‐free alternative fabrication processes, polyelectrolyte complex (PEC) membranes are recently discovered, offering a promising alternative. While flat sheet PEC membranes are successfully fabricated, tubular or hollow fiber geometries remain a material engineering challenge. For the first time, the organic solvent‐free fabrication of PEC tubular membranes in a dry‐jet wet spinning process is demonstrated. The aqueous polymer solution comprising the polyanion—poly(sodium‐4‐styrenesulfonate) (PSS), the polycation—poly(diallyldimethylammonium‐chloride) (PDADMAC), and KBr is extruded with the water‐based bore fluid through a single‐orifice spinneret, passing an air‐gap before immersed into an aqueous coagulation bath. The phase inversion kinetics are influenced to form a defect‐free lumen separation layer through the addition of glycerol to the bore fluid. The resulting tubular membranes show reproducible nanofiltration membrane properties. They have a molecular cut‐off of 320 Da, are positively charged and retain salts with a characteristic salt retention hierarchy. This promising material engineering strategy motivates to continue the quest for smaller tubular dimensions toward hollow fibers.

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Influence of bore fluid composition on the physiochemical properties and performance of hollow fiber membranes for ultrafiltration

Cited by 8 publications

References 24 publications

The Effects of PEI Hollow Fiber Substrate Characteristics on PDMS/PEI Hollow Fiber Membranes for CO2/N2 Separation

The Effects of PEI Hollow Fiber Substrate Characteristics on PDMS/PEI Hollow Fiber Membranes for CO2/N2 Separation

Glycerol and Antimicrobial Peptide-Modified Natural Latex for Bacteriostasis of Skin Wounds

Polyelectrolyte Complex Tubular Membranes via a Salt Dilution Induced Phase Inversion Process

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