Spiral wound, hollow fiber membrane modules: A new approach to higher mass transfer efficiency

Crowder, Mark L.; Gooding, Charles H.

doi:10.1016/s0376-7388(97)00174-9

Cited by 34 publications

(16 citation statements)

References 14 publications

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“…In addition, they contribute inductive, instructive, stimulating, and triggering effects to the skin cells and tissues. Numerous synthetic and natural polymers have been used for wound dressing applications as follows: natural polymers include alginate (8), gelatin (9), collagen (10), and chitosan (11,12) and the synthetic polymers such as poly(ethylene glycol) (13), silicone rubber (14), and poly(amino acid) (15) have also shown to be useful for wound healing applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Semi-Interpenetrating Polymer Network as a Bioactive Curcumin Film

et al. 2014

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Abstract. This study focused on the synthesis and characterization of a natural polymeric system employing the interpenetrating polymer network (IPN) comprising curcumin as a bioactive. Biopolymers and actives such as chitosan, hypromellose, citric acid, genipin, and curcumin were used to develop an effective, biodegradable, and biocompatible film employed therapeutically as a wound healing platform. The semi-IPN films were investigated for their physicochemical, physicomechanical, and biological properties by quantification by FTIR, DSC, and Young's modulus. Following characterization, an optimum candidate formulation was produced whereby further in vitro and ex vivo studies were performed. Results revealed a burst release occurring at the first hour with 1.1 mg bioactive released when in contact with the dissolution medium and 2.23 mg due to bioactive permeation through the skin, thus suggesting that the lipophilic nature of skin greatly impacted the bioactive release rate. Furthermore, chemical and mechanical characterization and tensile strength analysis revealed that the degree of crosslinking and concentration of polymeric material used significantly influenced the properties of the film.

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Section: Introductionmentioning

confidence: 99%

Synthesis of a Semi-Interpenetrating Polymer Network as a Bioactive Curcumin Film

et al. 2014

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“…In recent decades, numerous attempts have been made to design and fabricate effective membrane modules with optimized geometries and/or shear-induced accessories to enhance permeation and suppress undesirable polarization and membrane fouling [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…With rapid advancement of membrane science, currently available membranes used in many applications are so effective that the separation process is limited mainly by the mass transfer rate to the bulk-membrane interface rather than through the membrane itself [7]. To further interpret the mass transfer occurring in fluids, it is conventional to correlate parameters in a dimensionless form, such as the Graetz number (Gz), Schmidt number (Sc) and Sherwood number (Sh).…”

mentioning

confidence: 99%

“…reverse osmosis (RO), microfiltration (MF) & ultrafiltration (UF)), only the feed side (shell-side feeding pattern is assumed) may be subject to concentration polarization, which describes the phenomena of concentration build-up within the boundary layer near the membrane surface, due to the poor hydrodynamics and hence the low mass transfer coefficient [7]; while for most concentration-driven systems (e.g. membrane contactors), both tube and shell-side flows may have great impact on the overall module performance (e.g.…”

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confidence: 99%

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Membrane module design and dynamic shear-induced techniques to enhance liquid separation by hollow fiber modules: a review

Yang¹,

Wang²,

Fane³

et al. 2013

Desalination and Water Treatment

119

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Membrane-based separation processes have found numerous applications in various industries over the past decades. However, higher energy consumption, lower productivity and shorter membrane lifespan due to polarization and membrane fouling continue to present severe technical challenges to membrane-based separation. Improved membrane module design and novel hydrodynamics offer strategies to address these challenges.This review focuses on hollow fiber membrane modules which are well-suited to membrane contactor separation processes. Attempts to improve membrane module design should begin with a better understanding of the mass transfer in the hollow fiber module, therefore this review provides a summary of prior studies on the mass transfer models related to both the shell-side and tube-side fluid dynamics. Based on the mass transfer analysis, two types of technique to enhance hollow fiber membrane module performance are discussed: (1) passive enhancement techniques that involve the design and fabrication of effective modules with optimized flow geometry; or (2) active enhancement techniques that uses external energy to induce a high shear regime to suppress the undesirable fouling and concentration polarization phenomena. This review covers the progress over the past five years on the most commonly proposed techniques such as bubbling, vibrations and ultrasound.Both enhancement modes have their advantages and drawbacks. Generally, the passive enhancement techniques offer modest improvement of the system performance, while the active techniques, including bubbling, vibrating and ultrasound, are capable of providing as high as 315 times enhancement of the permeation flux. Fundamentally, the objectives of module design should include the minimization of the cost per amount of mass transferred (energy consumption 3 and module production cost) and the maximization of the system performance through optimizing the flow geometry and operating conditions of the module, scale-up potential and expansion of niche applications. It is expected that this review can provide inspiration for novel module development.

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“…Wound dressing materials are used in burns in order to assist the healing of wounds resulting from exposure to high levels of ionizing radiation [1] . Various natural and synthetic polymers with good biocompatibility have been used to develop wound dressing materials [2][3][4][5][6][7][8][9] . Electrospinning is widely used technique to produce nano-scaled fibers [10][11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Poly(vinyl alcohol)/Poly(vinyl pyrrolidone)-Iodine Nanofibers with Poloxamer 188 and Chitosan

Aytimur¹,

Koçyığıt²,

Uslu³

2013

Polymer-Plastics Technology and Engineering

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This study focuses on the fabrication of poly(vinyl alcohol)/ poly(vinyl pyrrolidone)-Iodine nanofibers via electrospinning. Electrospun fibers were characterized by FT-IR, DSC and SEM techniques. DSC results indicated that the thermal stability of nanofibers were improved after the addition of chitosan and poloxamer 188. SEM images showed that the spongiform structure is much more compact and fibrous in the case of added chitosan, with an average fiber diameter of 374 nm, whereas the addition of poloxamer 188 resulted in a more porous and beaded composition, with average fiber diameter of 489 nm.

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Spiral wound, hollow fiber membrane modules: A new approach to higher mass transfer efficiency

Cited by 34 publications

References 14 publications

Synthesis of a Semi-Interpenetrating Polymer Network as a Bioactive Curcumin Film

Synthesis of a Semi-Interpenetrating Polymer Network as a Bioactive Curcumin Film

Membrane module design and dynamic shear-induced techniques to enhance liquid separation by hollow fiber modules: a review

Synthesis and Characterization of Poly(vinyl alcohol)/Poly(vinyl pyrrolidone)-Iodine Nanofibers with Poloxamer 188 and Chitosan

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