Modeling of relationship between water permeability and microstructure parameters of ceramic membranes

Li, Weixing; Xing, Weihong; Xu, Nanping

doi:10.1016/j.desal.2005.07.042

Cited by 66 publications

(36 citation statements)

References 12 publications

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“…As stated above, the Hagen-Poiseuille equation, is usually employed to predict the water permeability of membranes [58]. Nevertheless, this equation uses the tortuosity factor (τ) which must be estimated by theoretical equations or empirical models [59].…”

Section: Tortuosity Estimate From a Proposed Modelmentioning

confidence: 99%

Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

Lorente-Ayza

Mestre

Menéndez

et al. 2015

Journal of the European Ceramic Society

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A comparison has been made between ceramic microfiltration membranes of the same composition obtained by pressing and by extrusion in terms of microstructure and properties.The extruded membranes displayed lower porosity and smaller pore size than pressed membranes. The higher the clay content in the starting composition, the clearer this tendency became. In contrast, the difference tended to disappear when starch was added to the initial composition. The mechanical strength values followed a decreasing exponential variation with porosity, which was influenced by the starting composition and the shaping method.Water permeability reflected the strong effect of the mean pore size. The membranes synthesised from the composition with the higher clay content showed the lowest permeability, while those obtained from the composition including starch showed the highest value. A model derived from the Hagen-Poiseuille equation enabled the tortuosity values to be calculated.

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Section: Tortuosity Estimate From a Proposed Modelmentioning

confidence: 99%

Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

Lorente-Ayza

Mestre

Menéndez

et al. 2015

Journal of the European Ceramic Society

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“…5. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 5 Although the research activity on low-cost microfiltration membranes has been very intense in the last years due to the many potential industrial applications of these materials very few papers have intended to model microstructural features of sintered membranes with functional properties of the membranes [40][41][42]. This is because the use of natural minerals (ball clays, kaolin, etc.)…”

Section: Introductionmentioning

confidence: 99%

Influence of starch content on the properties of low-cost microfiltration ceramic membranes

Lorente-Ayza

Sánchez

Sanz

et al. 2015

Ceramics International

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The use of starch as pore former is frequent in the fabrication of porous ceramic membranes, since starches are cheap, innocuous and environmentally friendly. A study has been conducted to evaluate the influence of potato starch content (0-30 wt %) and sintering temperature (1100 and 1400ºC) on low-cost ceramic microfiltration membranes. The raw materials were a mixture of kaolin, alumina and starch, from which membrane specimens were shaped by uniaxial dry pressing.The results indicated that the percentage of potato starch did affect the properties of the membrane. Thus, an increase of starch content provoked a reduction of bulk density (an increase of porosity) a rise of water permeability and a substantial modification (coarsening) of the pore size distribution. This effect deals with the role as pore former of starch, which burns out when fired. More interestingly, it was experimentally observed that the effect of starch was particularly effective for starch percentages higher than 10 wt% once a connected coarse pore network is developed. On the other hand, an increase in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 sintering temperature from 1100 to 1400ºC also influenced membranes' characteristics but the effect was much less significant than that of starch content. *Manuscript Click here to view linked ReferencesA percolation analysis based on the Effective Medium Approximation (EMA) contact model allowed to conclude that the critical porosity calculated corresponds to a starch content of 10.2 wt%, which agrees quite well with the estimation from experimental results. Finally, tortuosity was calculated with a simple model derived from Hagen-Poiseuille equation. The obtained data showed that tortuosity factor decreased as the starch content or sintering temperature increased. These findings are consistent with SEM analysis and pore size determination.

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“…The relationship between permeability and the other two pore parameters could be described by the Hagen-Poiseuille formula, which is expressed as follows [23]:…”

Section: Effect Of Pressure On Permeability Of Porous Fealmentioning

confidence: 99%

Effect of pressure on pore structure of porous FeAl intermetallics

Gao

Shen

et al. 2015

Advanced Powder Technology

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Modeling of relationship between water permeability and microstructure parameters of ceramic membranes

Cited by 66 publications

References 12 publications

Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

Influence of starch content on the properties of low-cost microfiltration ceramic membranes

Effect of pressure on pore structure of porous FeAl intermetallics

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