Morphological aspects and structure control of dual-layer asymmetric hollow fiber membranes formed by a simultaneous co-extrusion approach

Li, Dongfei; Chung, Tai‐Shung; Wang, Rong

doi:10.1016/j.memsci.2004.06.014

Cited by 155 publications

(95 citation statements)

References 40 publications

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“…The big difference in the shrinkage of the two layers is probably due to the stabilizing effect of the incorporated clay particles in the outer layer as well as the smaller precipitation rate of the outer layer as a result of the delayed demixing induced in the outer layer. 15 Furthermore, the thermodynamically different nature of outer layer (hydrophobic) and inner layer (hydrophilic) dope solutions might hinder the possible counter-diffusion of the two layers in the air-gap or coagulation regions. 15 From a morphological outlook, it can be observed that the outer functional layer has been formed in a desirable geometry with a small thickness (120 lm) and a big inner diameter (860 lm) without any deformation or collapse in the spinning line.…”

Section: Membrane Characterizationmentioning

confidence: 99%

A novel approach to fabricate macrovoid‐free and highly permeable PVDF hollow fiber membranes for membrane distillation

2009

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Section: Membrane Characterizationmentioning

confidence: 99%

A novel approach to fabricate macrovoid‐free and highly permeable PVDF hollow fiber membranes for membrane distillation

2009

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“…Membrane samples were prepared in liquid nitrogen. 24 After mounting the specimens on the stub by using the double-sided conductive carbon adhesive tape, the specimens were stored under vacuum. All samples were sputter coated with platinum of 2-3 3 10 28 m (200-300 Å ) in thickness using JEOL JFC-1200 ion sputtering device before testing.…”

Section: Characterizationsmentioning

confidence: 99%

Exploration of ionic modification in dual‐layer hollow fiber membranes for long‐term high‐performance protein separation

Soh

Chung

et al. 2008

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).Two types of ionic modification approaches (i.e., sulfonation and triethylamination) were applied with the aid of dual-layer hollow fiber technology in this work to fine tune the pore size and pore size distribution, introduce the electrostatic interaction, and reduce membrane fouling for long-term high-performance protein separation. A binary protein mixture comprising bovine serum albumin (BSA) and hemoglobin (Hb) was separated in this work. The sulfonated fiber exhibits an improved BSA/Hb separation factor at pH ¼ 6.8 compared with as-spun fibers but at the expense of BSA sieving coefficient. On the other hand, the triethylaminated fiber reveals the best and most durable separation performance at pH ¼ 4.8. Its BSA/Hb separation factor is maintained above 80 for 4 days and maximum BSA sieving coefficient reaches 33%. Therefore, this study documents that an intelligent combination of both size-exclusion and electrostatic interaction can synergistically enhance protein separation performance in both purity and concentration.

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“…The major problem in dual layer hollow fibre membranes is low integrity and delamination problem. A good adhesion between inner and outer polymers dope can only be achieved by properly control the spinning parameters such as bore fluid composition, spinning process temperature, air gap height [14] and ratio of outer layer dope flow rate to inner dope flow rate [15].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Dual Layer Hollow Fibre Membranes for Photocatalytic Degradation of Organic Pollutants

Dzinun¹,

Othman²,

Ismail³

et al. 2015

IJCEA

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Abstract-In recent years, the membrane photocatalytic reactor (MPR) systems have attracted much attention due to their promising function in treating organic pollutant and filtering clean water. Suspended photocatalyst titanium dioxide (TiO 2 ) particle always become a problematic in hybrid MPR system due to membrane fouling and TiO 2 loss. In the past few years, considerable attention has been paid to immobilize TiO 2 nanoparticles on various materials. Since ultraviolet (UV) source and TiO 2 are required for the photocatalytic reaction, thus, it is crucial to immobilize high concentration of TiO 2 on the outer surface of the polymeric membrane support. By using co-extrusion approach, a dual layer hollow fibre (DLHF) membrane was fabricated. The effect of additives on the dope polymer solutions and membrane morphologies of DLHF were investigated using of scanning electron microscopy (SEM). The SEM results showed that DLHF membranes have a good adhesion between layers with no delamination.Index Terms-Dual-layer hollow fibre membrane, co-extrusion, photocatalytic degradation, Titanium dioxide.

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Morphological aspects and structure control of dual-layer asymmetric hollow fiber membranes formed by a simultaneous co-extrusion approach

Cited by 155 publications

References 40 publications

A novel approach to fabricate macrovoid‐free and highly permeable PVDF hollow fiber membranes for membrane distillation

A novel approach to fabricate macrovoid‐free and highly permeable PVDF hollow fiber membranes for membrane distillation

Exploration of ionic modification in dual‐layer hollow fiber membranes for long‐term high‐performance protein separation

Fabrication of Dual Layer Hollow Fibre Membranes for Photocatalytic Degradation of Organic Pollutants

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