Investigation of Inner Surface Groove Formation Under Radially Inward Pressure During Immersion Precipitation-Based Hollow Fiber Membrane Fabrication

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Jun Yin ◽  
Nicole Coutris ◽  
Yong Huang
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Nerve Repair ◽  
Radial Pressure ◽  
Skin Layer ◽  
Elastic Cylindrical Shell ◽  
Fiber Membrane ◽  
Buckling Mode ◽  
Membrane Fabrication ◽  
Inner Surface

Axially aligned grooves can be formed on the hollow fiber membrane (HFM) inner surface under some controlled fabrication conditions during a typical immersion precipitation-based phase inversion fabrication process. Such grooved HFMs are finding promising medical applications for nerve repair and regeneration. For better nerve regeneration performance, the HFM groove geometry should be carefully controlled. Towards this goal, in this study the polyacrylonitrile (PAN) HFM groove number has been modeled based on the radially inward pressure-induced buckling mechanism. HFM has been modeled as a long six-layer fiber membrane, and the HFM inner skin layer has been treated as a thin-walled elastic cylindrical shell under the shrinkage-induced inward radial pressure. The groove number has been reasonably estimated based on the resulting buckling mode as compared with the experimental measurements.

Groove Formation Modeling in Fabricating Hollow Fiber Membrane for Nerve Regeneration

2010 ◽  
Vol 78 (1) ◽  
Author(s):  
Jun Yin ◽  
Nicole Coutris ◽  
Yong Huang
Keyword(s):  
Nerve Regeneration ◽  
Hollow Fiber ◽  
Phase Inversion ◽  
Hollow Fiber Membrane ◽  
Nerve Repair ◽  
Industrial Applications ◽  
Elastic Cylindrical Shell ◽  
Fiber Membrane ◽  
Membrane Fabrication ◽  
Recent Interest

Hollow fiber membrane (HFM) is one of the most popular membranes used for different industrial applications. Under some controlled fabrication conditions, axially aligned grooves can be formed on the HFM inner surface during typical immersion precipitation-based phase inversion fabrication processes. Such grooved HFMs are finding promising medical applications for nerve repair and regeneration. For better nerve regeneration performance, the HFM groove morphology should be carefully controlled. Toward this goal, this study has modeled the HFM groove number based on the shrinkage-induced buckling model in HFM fabrication. HFM has been modeled as a three-layer long fiber membrane. The HFM inner layer has been treated as a thin-walled elastic cylindrical shell and buckles due to the shrinkage of the compliant intermediate layer during solidification. The groove geometry, especially the groove number, has been reasonably predicted compared with the experimental measurements. This study has laid a mathematical foundation for HFM circumferential instability modeling, which is of recent interest in membrane fabrication.

Interfacially Polymerized Composite Hollow Fiber Membrane for CO2 Separation

2013 ◽  
Vol 781-784 ◽  
pp. 2040-2046
Author(s):  
Alsamani A. M. Salih ◽  
Chun Hai Yi ◽  
Bo Lun Yang ◽  
Peng Chen
Keyword(s):  
Hollow Fiber ◽  
Interfacial Polymerization ◽  
Hollow Fiber Membrane ◽  
Fiber Membrane ◽  
Acceptor Concentration ◽  
Membrane Performance ◽  
Inner Surface ◽  
Trimesoyl Chloride ◽  
Very High ◽  
Organic Monomer

PEAm-TMC/PDMS/PVC composite hollow fiber membrane for CO2 separation was developed through interfacial polymerization (IP) on the PDMS pre-coated inner surface of PVC hollow fiber. Polyetheramine (PEAm) and Trimesoyl chloride (TMC) were selected as aqueous monomer and organic monomer, respectively. SEM observation result shows that the thickness of PEAm-TMC IP layer is about 215 nm. The effects of monomer concentrations and acid acceptor concentration on the membrane performance were investigated. The results shows that the CO2 permeance decareses and CO2/N2 selectivity increases with the increasing concentrations of PEAm, TMC and Na2CO3. At 0.12 MPa, the composite hollow fiber membrane possesses a very high CO2 permeance of 964 GPU and CO2/N2 selectivity of 40.6.

Preparation of Ceramic Hollow Fiber Membrane Using Phase Inversion and Sintering Technique

2016 ◽  
Vol 1133 ◽  
pp. 141-145 ◽  
Author(s):  
Norfazliana Abdullah ◽  
Mukhlis A. Rahman ◽  
A.F. Ismail ◽  
M.H.D. Othman ◽  
Juhana Jaafar
Keyword(s):  
Hollow Fiber ◽  
Phase Inversion ◽  
Hollow Fiber Membrane ◽  
Fabrication Process ◽  
Asymmetric Structure ◽  
Sintering Process ◽  
Fiber Membrane ◽  
Membrane Fabrication ◽  
Phase Inversion Technique ◽  
The Given

Alumina hollow fiber membrane with asymmetric structure has been developed using phase inversion technique followed by sintering process. The formation of asymmetric alumina hollow fiber was influenced by a phenomenon known as hydrodynamically unstable viscous fingering. A desired morphology of the ceramic hollow fiber membrane, that consists of 52 % of finger-like and the rest is sponge-like structure, is tailored by controlled parameters during membrane fabrication process. The result shows that the ratio of alumina/PESf should be reduced to 6. At this ratio, the finger-like structure can be easily formed with inner and outer diameters were 1.11 mm and 2.05 mm respectively. From the given thickness, approximately 243 µm of finger-like length can be developed originating from the lumen of hollow fiber.

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