Effect of wet and dry-jet wet spinning on the shear-induced orientation during the formation of ultrafiltration hollow fiber membranes

Qin, Jianjun

doi:10.1016/s0376-7388(00)00552-4

Cited by 118 publications

(51 citation statements)

References 34 publications

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“…All three of these variables were changed simultaneously, and so the effect of each variable independently on fiber diameter can not be reported. Qin et al (2001) also reported an increase in fiber diameter if the air gap was eliminated (i.e. the spinneret rests just above the coagulant).…”

Section: Wet / Dry Spinningmentioning

confidence: 94%

“…A number of different factors influence the product of wet spinning. These parameters include spinneret geometry, temperature, dope extrusion rate, dope and coagulant composition, fiber take-up speed, and length of the air gap (Qin, 2001). A key fiber characteristic, fiber diameter, has been found dependant on several of these variables.…”

Section: Wet / Dry Spinningmentioning

confidence: 99%

“…For example, Qin demonstrated that the fibers with no air gap were stronger and had higher stiffness, but were less permeable to water than fibers drawn with an air gap. Qin (2001) postulated that these results were not a factor of gravity induced tensile forces (because the air gap was only 1 cm), but instead, they were due to a more ordered molecular structure in the no-air gap conditions (the molecular order structure was locked into place upon coagulation by removing the solvent immediately after passing through the spinneret).…”

Section: Wet / Dry Spinningmentioning

confidence: 99%

“…The resulting polymer tube can be coagulated in a manner identical to fiber spinning. It has been suggested by many research groups (Qin, 2001;Mok, 1995;Wienk, 1995;Pereira, 2001;Yang, 2001) that these structures can be used as filter membranes with the permeability controlled through the alteration of the previously discussed variables. In addition, composite tubes have been constructed from two different polymers, allowing one polymer to be the primary source of structural support and the other polymer, with favorable membrane qualities such as a hydrophilic boundary, to allow for interaction between the tube wall and a surrounding fluid.…”

Section: Wet / Dry Spinningmentioning

confidence: 99%

“…Wu et al [4,15] have shown a correlation between increased take-up speed and superior mechanical properties.…”

Section: Melt Spinningmentioning

confidence: 99%

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A characterization of micromanipulator controlled dry spinning of micro- and nanoscale polymer fibers.

Berry¹

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No current micro fabrication technique exists for producing roomtemperature, high-precision, point-to-point polymer nanofibers in three dimensions.Producing rounded structures in a third dimension is particularly difficult to accomplish with conventional planar micro fabrication techniques. Therefore, the purpose of this study is to characterize a novel method for fabricating such structures.In this investigation, PMMA micro-and nano-fibers have been fabricated using a technique which involves drawing a solvated polymer bridge between two liquid pools with a stylus positioned by an ultra-high-precision micromill. The solvent in the solution bridge rapidly evaporates, leaving a suspended PMMA fiber between the two pools. In order to characterize this process, fibers were drawn over a 1.8 mm silicon trench and fiber diameter was measured over a variety of different solution concentrations and polymer molecular weights. In addition, the fluid characteristics of the solutions were measured to allow for comparisons between fiber diameter and properties such as viscosity and surface tension.Fiber diameters ranging from 450 nm to 50 J.1IIl were drawn during the characterization experiments. In addition, fibers as small as 140 nm were drawn over distances less than 1.8 mm. It was observed that fiber diameter enlarged as both solution concentration and polymer molecular weight increased. In an attempt to decrease fiber diameter variance, different stylus materials were also examined, and it was found that a parylene-coated stylus resulted in a fair reduction, but not elimination, of the diameter variance. Although fiber diameter variances remain somewhat high, possibly due to unwanted solution IV buildup on the stylus tip, this fabrication technique presents a simple method for producing precisely positioned, low temperature, suspended polymer fiber structures on the micro-and nanoscale.

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Section: Wet / Dry Spinningmentioning

confidence: 94%

Section: Wet / Dry Spinningmentioning

confidence: 99%

Section: Wet / Dry Spinningmentioning

confidence: 99%

Section: Wet / Dry Spinningmentioning

confidence: 99%

“…Wu et al [4,15] have shown a correlation between increased take-up speed and superior mechanical properties.…”

Section: Melt Spinningmentioning

confidence: 99%

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A characterization of micromanipulator controlled dry spinning of micro- and nanoscale polymer fibers.

Berry¹

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Fluid Flow Templating of Polymeric Soft Matter with Diverse Morphologies

et al. 2023

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It is challenging to find a conventional nanofabrication technique that can consistently produce soft polymeric matter of high surface area and nanoscale morphology in a way that is scalable, versatile, and easily tunable. Here, the capabilities of a universal method for fabricating diverse nano‐ and micro‐scale morphologies based on polymer precipitation templated by the fluid streamlines in multiphasic flow are explored. It is shown that while the procedure is operationally simple, various combinations of its intertwined mechanisms can controllably and reproducibly lead to the formation of an extraordinary wide range of colloidal morphologies. By systematically investigating the process conditions, 12 distinct classes of polymer micro‐ and nano‐structures including particles, rods, ribbons, nanosheets, and soft dendritic colloids (dendricolloids) are identified. The outcomes are interpreted by delineating the physical processes into three stages: hydrodynamic shear, capillary and mechanical breakup, and polymer precipitation rate. The insights into the underlying fundamental mechanisms provide guidance toward developing a versatile and scalable nanofabrication platform. It is verified that the liquid shear‐based technique is versatile and works well with many chemically diverse polymers and biopolymers, showing potential as a universal tool for simple and scalable nanofabrication of many morphologically distinct soft matter classes.

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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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Effect of wet and dry-jet wet spinning on the shear-induced orientation during the formation of ultrafiltration hollow fiber membranes

Cited by 118 publications

References 34 publications

A characterization of micromanipulator controlled dry spinning of micro- and nanoscale polymer fibers.

A characterization of micromanipulator controlled dry spinning of micro- and nanoscale polymer fibers.

Fluid Flow Templating of Polymeric Soft Matter with Diverse Morphologies

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

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