A morphological study of ceramic hollow fibre membranes

Kingsbury, Benjamin F.K.; Li, K.

doi:10.1016/j.memsci.2008.11.050

Cited by 337 publications

(199 citation statements)

References 20 publications

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“…Alumina hollow fibre membranes were prepared according to the method described by Benjamin et al [13]. The fabricating method was modified in order to obtain an asymmetric structure with finger-like supporting layers functioning as high throughput microreactors in series.…”

Section: Immobilized Proteinmentioning

confidence: 99%

“…Alumina hollow fiber membranes were prepared by a combined phase inversion and sintering technique [13]. Briefly, dispersant (Arlacel P135 1.3 wt %) was dissolved in NMP/water solutions and then aluminum oxide powders (58.7 wt %) at a ratio of 1:2:7 (0.01 µm:0.05 µm:1 µm) were added to the mixture.…”

Section: Preparation Of Alumina Hollow Fiber Membranesmentioning

confidence: 99%

“…Phase inversion has been widely adopted for the production of polymeric hollow fibre membranes [13], and has been further developed to fabricate ceramic counterparts after modifying the suspension compositions and incorporating an additional sintering process Asymmetric hollow fiber configuration offers a high surface area/volume ratio, after counting in the surface area of the self-organised micro-channels, which promotes an increased loading of the enzyme and a higher oil/water interfacial surface preferred in a biphasic system. Many studies have been carried out on BMRs by employing different kinds of polymeric membranes and biocatalysts [14], with limited studies available on BMRs using inorganic support, summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Use of a Ceramic Membrane to Improve the Performance of Two-Separate-Phase Biocatalytic Membrane Reactor

Ranieri

Mazzei

et al. 2016

Molecules

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Biocatalytic membrane reactors (BMR) combining reaction and separation within the same unit have many advantages over conventional reactor designs. Ceramic membranes are an attractive alternative to polymeric membranes in membrane biotechnology due to their high chemical, thermal and mechanical resistance. Another important use is their potential application in a biphasic membrane system, where support solvent resistance is highly needed. In this work, the preparation of asymmetric ceramic hollow fibre membranes and their use in a two-separate-phase biocatalytic membrane reactor will be described. The asymmetric ceramic hollow fibre membranes were prepared using a combined phase inversion and sintering technique. The prepared fibres were then used as support for lipase covalent immobilization in order to develop a two-separate-phase biocatalytic membrane reactor. A functionalization method was proposed in order to increase the density of the reactive hydroxyl groups on the surface of ceramic membranes, which were then amino-activated and treated with a crosslinker. The performance and the stability of the immobilized lipase were investigated as a function of the amount of the immobilized biocatalytst. Results showed that it is possible to immobilize lipase on a ceramic membrane without altering its catalytic performance (initial residual specific activity 93%), which remains constant after 6 reaction cycles.

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Section: Immobilized Proteinmentioning

confidence: 99%

Section: Preparation Of Alumina Hollow Fiber Membranesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of a Ceramic Membrane to Improve the Performance of Two-Separate-Phase Biocatalytic Membrane Reactor

Ranieri

Mazzei

et al. 2016

Molecules

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“…In addition, in the previous batch of HFs, the co-extrusion rate of outer layer of 0.5 cm firstly, the addition of ethanol, as a non-solvent, would increase the initial viscosity of a spinning suspension, as shown in Table 1, and secondly, the presence of ethanol would accelerate the precipitation of polymer binder during the phase inversion process because the polymer phase is closer to its precipitation point, which results in the increase of the local viscosity of the nascent fibre. The viscous fingering, [9] which is considered as the main phenomenon for the formation of the finger-like voids in the ceramic hollow fibres, has been limited by these two effects and as a result, confines the growth of finger-like voids in the fibres. As can also be seen in Figure 1, the dense electrolyte outer layer is very well-bounded to the anode inner layer, although different solvents were used for preparing the spinning suspensions of the two layers.…”

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confidence: 99%

High‐Performance, Anode‐Supported, Microtubular SOFC Prepared from Single‐Step‐Fabricated, Dual‐Layer Hollow Fibers

et al. 2011

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Micro-tubular solid oxide fuel cells (SOFCs) have been developed in recent years mainly due to their high specific surface area and fast thermal cycling. Previously, the fabrication of micro-tubular SOFC was achieved through multiple-step processes. [1][2][3] A support layer, for example anode-support, is first prepared and pre-sintered to provide mechanical strength to the fuel cell. The electrolyte layer is then deposited and sintered prior to the final coating of cathode layer. Each step involves at least one high temperature heat treatment, making the cell fabrication time-consuming and costly, with unstable control over cell quality. For a more economical fabrication of micro-tubular SOFC with reliability and flexibility in quality control, an advanced dry-jet wet extrusion technique, i.e. a phase-inversion-based coextrusion process, is developed. Using this technique, a dual-layer electrolyte/electrode (either anode or cathode) hollow fibre (HF) can be formed in a single step. Generally, the electrolyte and electrode materials are separately mixed with solvent and polymer binder to form the outer and inner layer spinning suspensions, respectively, before simultaneously co-extruded through a triple-orifice spinneret, passing through an air gap and finally into a non-solvent external coagulation bath. In the mean time, a stream of non-solvent internal coagulant is supplied through the central bore of the spinneret. Thickness of the two layers are largely determined by the design of the spinneret and can be adjusted by the corresponding extrusion rate, while the macrostructure or morphology of the prepared HF precursor can be controlled 1 Submitted to by adjusting co-extrusion parameters such as suspension viscosity, air gap, flow rate of internal coagulant, etc. The obtained dual-layer HF precursor is finally co-sintered once at high temperature as a procedure to remove polymer binder and form bounding between the ceramic materials. In our previous work, [4][5][6] a dual-layer HF support for micro-tubular SOFC, which consists of an electrolyte outer layer of approximately 80 µm supported by an asymmetric anode inner layer with 35 % finger-like voids length, was successfully fabricated using the co-extrusion/co-sintering process. A single cell that obtained after deposition of a multi-layer cathode onto the dual-layer HF produced the maximum power density of 0.59 W cm -2 at 570 o C.[6] Improvement on the structure of the dual-layer HFs was further performed by reducing the electrolyte layer thickness to as thin as 10 µm and the maximum power density of the corresponding cell markedly increased to about 1.11 W cm -2 at 600 o C. [7] Although this result has proved the potential of the dual-layer HF as a promising support for micro-tubular SOFC, the value of powder density was still slightly lower than the ramextruded anode-supported cell with similar electrolyte thickness and highly porous anode (about 1.29 W cm -2 at 600 o C).[8] One of the possible major reasons for the lower power output is the less effectiv...

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“…Characteristics of asymmetric ceramic membranes are mainly influenced by process parameters such as suspension composition, air gap, extrusion rate, bore liquid flow rate and sintering temperature (Lee et al, 2014;Liu et al, 2003;Sun et al, 2006;Kingsbury and Li, 2009;Li et al, 2006). GarciaGarcia et al (2011GarciaGarcia et al ( 2012 showed that the increase in the sintering temperature increased the bending strength of the membrane but decreased its permeability.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of Asymmetric Alumina Hollow Fibres: Application for Hydrogen Permeation in Composite Membranes

Terra

Lemos

Silva

et al. 2016

Braz. J. Chem. Eng.

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-Asymmetric alumina hollow fibres produced by the phase inversion/sintering method present advantages in that high area/volume ratios and low mass transfer resistances are achieved due to the geometric configuration and the pore size distribution, respectively. Here we characterise hollow fibres that were prepared with different internal coagulants and at different sintering temperatures. Additionally, a palladium membrane was deposited on these different hollow fibres and hydrogen permeabilities through them were compared. More fingers were obtained when a mixture of solvent with water was used as internal coagulant, instead of pure water. At the same sintering temperature, nitrogen permeance through the fibre was increased 5-fold when a mixture of solvent and water was used as internal coagulant instead of pure solvent, and the water flux was increased 7-fold. The decrease in the sintering temperature increased the water permeance through the fibre from 21.4 to 63.9 L h when using a more permeable hollow fibre as substrate. These results elucidate better conditions to fabricate hollow fibres that present low mass transfer resistances.

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A morphological study of ceramic hollow fibre membranes

Cited by 337 publications

References 20 publications

Use of a Ceramic Membrane to Improve the Performance of Two-Separate-Phase Biocatalytic Membrane Reactor

Use of a Ceramic Membrane to Improve the Performance of Two-Separate-Phase Biocatalytic Membrane Reactor

High‐Performance, Anode‐Supported, Microtubular SOFC Prepared from Single‐Step‐Fabricated, Dual‐Layer Hollow Fibers

Characterisation of Asymmetric Alumina Hollow Fibres: Application for Hydrogen Permeation in Composite Membranes

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