Enhancement of track-etched membrane performance via stretching

Worrel, Leah S.; Morehouse, Jason A.; Shimko, Leah A.; Lloyd, Douglas R.; Lawler, Desmond F.; Freeman, Benny D.

doi:10.1016/j.seppur.2006.06.017

Cited by 17 publications

(14 citation statements)

References 27 publications

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“…In other words, for the same separation factor, a higher permeate flux can be obtained if the pore aspect ratio is increased. This result agrees with the experimental findings of Worrel [ 13 ] and Morehouse et al [ 11 , 12 ] who found the same effect of increasing aspect ratio of permeate flux. This strengthens confidence in the theoretical development carried out in the current work.…”

Section: Effect Of Pore Geometry On Membrane Performancesupporting

confidence: 93%

“…The results presented in this section are significant as they can help explain why previous experimental studies with stretched membranes showed that the separation factor increased, stayed the same, or even reduced for stretched membranes [ 13 ].…”

Section: Effect Of Stretching On Membrane Performancementioning

confidence: 71%

“…Previous studies show that membrane stretching can have a positive effect on membrane permeability [ 11 , 12 , 13 ]. On the other hand, the effect of stretching on the separation factor could not be properly identified as experiments showed that there were cases in which the separation factor increased, remained unchanged, or even reduced [ 13 ].…”

Section: Membrane Stretchingmentioning

confidence: 99%

“…To take advantage of improved membrane performance when pore aspect ratio is high, studies have also been conducted to see the effect of artificially increasing pore aspect ratio by uniaxial stretching of the membranes [ 11 , 12 , 13 ]. Morehouse et al [ 11 , 12 ] and Worrel [ 13 ] carried out experimental and numerical studies to study the effect of uniaxial stretching on the pore geometry and performance of PET track-etched membranes and phase-inversion PES and PVDF membranes, respectively. Both found that an increase in the pore aspect ratio resulted in improved permeate flux, but no definite trend in the rejection rate of the solutes was observed as the uniaxial strain applied to the membrane was increased.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Permeability-Selectivity Analysis of Microfiltration and Ultrafiltration Membranes: Effect of Pore Size and Shape Distribution and Membrane Stretching

2016

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We present a modeling approach to determine the permeability-selectivity tradeoff for microfiltration and ultrafiltration membranes with a distribution of pore sizes and pore shapes. Using the formulated permeability-selectivity model, the effect of pore aspect ratio and pore size distribution on the permeability-selectivity tradeoff of the membrane is analyzed. A finite element model is developed to study the effect of membrane stretching on the distribution of pore sizes and shapes in the stretched membrane. The effect of membrane stretching on the permeability-selectivity tradeoff of membranes is also analyzed. The results show that increasing pore aspect ratio improves membrane performance while increasing the width of pore size distribution deteriorates the performance. It was also found that the effect of membrane stretching on the permeability-selectivity tradeoff is greatly affected by the uniformity of pore distribution in the membrane. Stretching showed a positive shift in the permeability-selectivity tradeoff curve of membranes with well-dispersed pores while in the case of pore clustering, a negative shift in the permeability-selectivity tradeoff curve was observed.

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Section: Effect Of Pore Geometry On Membrane Performancesupporting

confidence: 93%

Section: Effect Of Stretching On Membrane Performancementioning

confidence: 71%

Section: Membrane Stretchingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Permeability-Selectivity Analysis of Microfiltration and Ultrafiltration Membranes: Effect of Pore Size and Shape Distribution and Membrane Stretching

2016

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“…Chandler and Zydney [5] showed that the initial rate of flux decline during yeast cell microfiltration was reduced for membranes with slit-shaped pores compared to membranes with circular pores, with the difference in fouling behavior arising because the deposited cells are unable to fully block the slit-shaped pores due to their high aspect ratio. Worrel et al [6] found higher flux and reduced fouling rates during microfiltration of silicon dioxide and polystyrene particles through poly(ethylene teraphthalate) track-etched membranes that were stretched to generate ellipsoidal pores (compared to the cylindrical pores in the unstretched membranes), with the increased flux in good agreement with simple theoretical calculations based on an appropriate sieve mechanism [7]. However, there are currently no experimental data on the possible effect of the membrane pore geometry on the performance of ultrafiltration membranes, largely because of the difficulty in fabricating nanometer-size pores using traditional production techniques.…”

Section: Introductionmentioning

confidence: 99%

Permeability–selectivity analysis for ultrafiltration: Effect of pore geometry

Kanani

Fissell

Roy

et al. 2010

Journal of Membrane Science

126

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The effects of pore size on the performance of ultrafiltration membranes are fairly well understood, but there is currently no information on the impact of pore geometry on the trade-off between the selectivity and permeability for membranes with pore size below 100 nm. Experimental data are presented for both commercial ultrafiltration membranes and for novel silicon membranes having slit-shaped nanopores of uniform size fabricated by photolithography using a sacrificial oxide technique. Data are compared with theoretical calculations based on available hydrodynamic models for solute and solvent transport through membranes composed of a parallel array of either cylindrical or slit-shaped pores. The results clearly demonstrate that membranes with slit-shaped pores have higher performance, i.e., greater selectivity at a given value of the permeability, than membranes with cylindrical pores. Theoretical calculations indicate that this improved performance becomes much less pronounced as the breadth of the pore size distribution increases. These results provide new insights into the effects of pore geometry on the performance of ultrafiltration membranes

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Precisely Determined Water Permeabilities of Sub‐100 nm Nanochannels

Liu

Huang

et al. 2020

Adv Materials Inter

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Membrane ultrafiltration is an extensively used technique for water purification and hence understanding the water flow confined in nanochannels is of vital importance. As a key parameter, water permeability has been the focus of fundamental researches and technical applications. However, water permeability in sub‐100 nm regime is not yet well understood as evidenced by the previously published data which are divergent from theory. Here, the precise determination of water permeabilities of sub‐100 nm nanochannels is reported. This is achieved by the proposed innovative pore diameter‐calibration method with excellent accuracy through replicating the pore geometry, and using the nanoporous ion track‐etched membrane as a model system which features well‐defined, cylindrical, straight, and equally sized nanochannels. Thanks to this accurate calibration method, the measured permeabilities show a remarkably improved precision as compared to the previously reported data. In addition, the measured permeabilities of the ultrafiltration channels are lower than the theoretical predictions. The discrepancy is explained under the framework of the wettability effect. It is expected that the work will shed light on a controversy over a decrease or increase in water permeability of ultrafiltration membranes and also guide the design of ultrafiltration membranes for water purification and separation applications.

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Enhancement of track-etched membrane performance via stretching

Cited by 17 publications

References 27 publications

Permeability-Selectivity Analysis of Microfiltration and Ultrafiltration Membranes: Effect of Pore Size and Shape Distribution and Membrane Stretching

Permeability-Selectivity Analysis of Microfiltration and Ultrafiltration Membranes: Effect of Pore Size and Shape Distribution and Membrane Stretching

Permeability–selectivity analysis for ultrafiltration: Effect of pore geometry

Precisely Determined Water Permeabilities of Sub‐100 nm Nanochannels

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