On the droplet formation in hollow-fiber emulsification

Breisig, Hans; Hoppe, Jens; Melin, Thomas; Weßling, Matthias

doi:10.1016/j.memsci.2014.05.022

Cited by 14 publications

(13 citation statements)

References 31 publications

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“…Using liquids in the core of a bicomponent fiber can add new characteristics to the fibers applications. There are a large number of studies reporting optical, self‐healing, and membrane applications of liquid‐filled fibers. Xu et al .…”

Section: C/s Fibersmentioning

confidence: 99%

Recent advances in core/shell bicomponent fibers and nanofibers: A review

Naeimirad

Ali

Kotek

et al. 2018

J of Applied Polymer Sci

146

103

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There has been a steady progress in developing synthetic fibers in the past few years. Bicomponent fibers and nanofibers in a core/shell (C/S) configuration, including two dissimilar materials have presented unusual potential for use in many novel applications. These fibers can be produced using a variety of materials via different techniques i.e., coaxial melt spinning and electrospinning. In this review, we discuss the recent advances in C/S fibers and nanofibers' production. The first part has been assigned to the bicomponent fibers manufacturing technology, while production and applications of C/S nanofibers have been described in the second part.

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Section: C/s Fibersmentioning

confidence: 99%

Recent advances in core/shell bicomponent fibers and nanofibers: A review

Naeimirad

Ali

Kotek

et al. 2018

J of Applied Polymer Sci

146

103

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“…Some other microfluidic research works are based on the fibers' internal surface . Scientists from Empa carried microflow (Figure ) through the melt‐spun liquid core and hollow fibers using a home‐developed setup, assisted with external pressure.…”

Section: Lab On Fibermentioning

confidence: 99%

Microfluidic through fibrous structures: Recent developments and future trends

Naeimirad

Abuzade

Babaahmadi

et al. 2019

Mat Design & Process Comms

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This report shortly reviews recent developments in fabrication and application of low-cost and low-volume microfluidic devices using fibrous structures, e.g individual fiber, threads, and textile fabrics. Microfluidic concept is capable via wicking (capillary action) either external pumping of fluids through pathways of multifilament threads and textile structure. Furthermore, textile patterning and combination of hydrophilic and hydrophobic fibrous materials can be helpful. Different materials, e.g. cotton fibers and hollow fibers, have been used by several techniques to form hydrophilic-hydrophobic contrast and liquid control in textile-based microfluidic devices. The wicking property and flexibility of fibrous structures make it suitable for 3D microfluidic devices.These fiber-based microfluidic systems have potential applications in diagnostics and human health monitoring systems.

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“…Since both phases are largely made of water, their wetting properties are similar, thus the selection of the material is not trivial as in oil-water systems. 20,21 A membrane with a high wetting affinity towards a polar (aqueous) phase such as polyethersulfone (PES)/polyvinylpyrrolidone (PVP) membranes would render the droplet formation impossible since it is susceptible to wetting by both phases. In contrast, a membrane material with poor water wettability can minimize the risk of wetting by the droplet phase.…”

Section: B Experimental Setup For Droplet Formationmentioning

confidence: 99%

“…Further details on the experimental setup can be found in a previous publication. 20 C. Experimental procedure Following the considerations described above, the more hydrophobic 28 and lighter PEGrich top phase is used as continuous phase (cf. Figure 1) The module is placed with the outlet pointing downwards due to the higher density of the phosphate-rich bottom phase (q B ¼ 1151.4 g/l vs. q T ¼ 1078.9 g/l, both measured in a 5 ml pycnometer).…”

Section: B Experimental Setup For Droplet Formationmentioning

confidence: 99%

“…19 In a particularly precise membrane-based process, a hollow fiber membrane is used to create an accelerated coflowing stream that, in turn, leads to thread break-up and the production of droplets with very narrow size distributions even below 1% standard deviation. 20,21 This method can also be used in a microfluidic channel configuration and allows potential downsizing into the micrometer scale. 22 As opposed to today's microfluidic processes, this ATPS droplet formation process does not rely on an external trigger as will be presented below.…”

Section: Introductionmentioning

confidence: 99%

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Droplet formation and shrinking in aqueous two-phase systems using a membrane emulsification method

Breisig

Weßling

2015

Biomicrofluidics

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Using a membrane emulsification method based on porous hollow-fiber membranes in combination with an aqueous two-phase system (ATPS), we are able to produce "water-in-water" droplets with narrow-dispersed size distributions. The equilibrium phases of the aqueous two-phase system polyethylene glycol-dipotassium hydrogen phosphate are used for this purpose. The droplet diameter of a given fluid system is determined by the flow rates of the continuous and disperse phase as well as the hollow fiber dimensions. When diluting the disperse phase and thus moving the ATPS system out of equilibrium, the droplet size can be further reduced in comparison to the equilibrium case. Generally, droplets formed with this method have diameters 20%-60% larger than the inner hollow fiber diameter. The new strategy of diluting the disperse phase allows the production of droplet diameter below the inner diameter of the membrane.

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On the droplet formation in hollow-fiber emulsification

Cited by 14 publications

References 31 publications

Recent advances in core/shell bicomponent fibers and nanofibers: A review

Recent advances in core/shell bicomponent fibers and nanofibers: A review

Microfluidic through fibrous structures: Recent developments and future trends

Droplet formation and shrinking in aqueous two-phase systems using a membrane emulsification method

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