Modeling of pore formation in phase inversion processes: Model and numerical results

Hopp‐Hirschler, Manuel; Nieken, Ulrich

doi:10.1016/j.memsci.2018.07.085

Cited by 41 publications

(32 citation statements)

References 41 publications

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“…Several mathematical models of the phase inversion process were published [52,62,63,64,65,66,67,68,69]. Taking immersion precipitation as an example, liquid-liquid phase demixing plays a key role in this process.…”

Section: Methods Of Preparationmentioning

confidence: 99%

A Review on Porous Polymeric Membrane Preparation. Part I: Production Techniques with Polysulfone and Poly (Vinylidene Fluoride)

2019

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Porous polymeric membranes have emerged as the core technology in the field of separation. But some challenges remain for several methods used for membrane fabrication, suggesting the need for a critical review of the literature. We present here an overview on porous polymeric membrane preparation and characterization for two commonly used polymers: polysulfone and poly (vinylidene fluoride). Five different methods for membrane fabrication are introduced: non-solvent induced phase separation, vapor-induced phase separation, electrospinning, track etching and sintering. The key factors of each method are discussed, including the solvent and non-solvent system type and composition, the polymer solution composition and concentration, the processing parameters, and the ambient conditions. To evaluate these methods, a brief description on membrane characterization is given related to morphology and performance. One objective of this review is to present the basics for selecting an appropriate method and membrane fabrication systems with appropriate processing conditions to produce membranes with the desired morphology, performance and stability, as well as to select the best methods to determine these properties.

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Section: Methods Of Preparationmentioning

confidence: 99%

A Review on Porous Polymeric Membrane Preparation. Part I: Production Techniques with Polysulfone and Poly (Vinylidene Fluoride)

2019

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“…The interpretation of pore formation should consider time and kinetic resolution of the coagulation and during pore generation. [ 127 ]…”

Section: Water Interactions In Multiscaled Cellulosic Assembliesmentioning

confidence: 99%

Plant Nanomaterials and Inspiration from Nature: Water Interactions and Hierarchically Structured Hydrogels

et al. 2020

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Recent developments in the area of plant‐based hydrogels are introduced, especially those derived from wood as a widely available, multiscale, and hierarchical source of nanomaterials, as well as other cell wall elements. With water being fundamental in a hydrogel, water interactions, hydration, and swelling, all critically important in designing, processing, and achieving the desired properties of sustainable and functional hydrogels, are highlighted. A plant, by itself, is a form of a hydrogel, at least at given states of development, and for this reason phenomena such as fluid transport, diffusion, capillarity, and ionic effects are examined. These aspects are highly relevant not only to plants, especially lignified tissues, but also to the porous structures produced after removal of water (foams, sponges, cryogels, xerogels, and aerogels). Thus, a useful source of critical and comprehensive information is provided regarding the synthesis of hydrogels from plant materials (and especially wood nanostructures), and about the role of water, not only for processing but for developing hydrogel properties and uses.

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“…In the absence of fluctuations (Figure 2a), a pattern of alternating polymerrich and polymer-poor layers forms parallel to the film−bath interface, consistent with other numerical studies of NIPS. 8,12 We attribute the propagation of the ordered pattern to surfacedirected spinodal decomposition (SDSD). 19 In contrast, enabling fluctuations (Figure 2b) introduces disorder to the dynamics, disrupting the propagation of this ordered pattern with more isotropic bulk spinodal decomposition.…”

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confidence: 99%

Mechanisms of Asymmetric Membrane Formation in Nonsolvent-Induced Phase Separation

et al. 2020

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We report the first simulations of nonsolvent-induced phase separation (NIPS) that predict membrane microstructures with graded asymmetric pore size distribution. In NIPS, a polymer solution film is immersed in a nonsolvent bath, enriching the film in nonsolvent, and leading to phase separation that forms a solid polymer-rich membrane matrix and polymer-poor membrane pores. We demonstrate how mass-transfer-induced spinodal decomposition, thermal fluctuations, and glass-transition dynamicsimplemented with mobility contrast between the polymer-rich and polymer-poor phasesare essential to the formation of asymmetric membrane microstructures. Specifically, we show that the competition between the propagation of the phase-separation and glass-transition fronts determines the degree of pore-size asymmetry. We also explore the sensitivity of these microstructures to the initial film composition, and compare their formation in 2D and 3D.

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Modeling of pore formation in phase inversion processes: Model and numerical results

Cited by 41 publications

References 41 publications

A Review on Porous Polymeric Membrane Preparation. Part I: Production Techniques with Polysulfone and Poly (Vinylidene Fluoride)

A Review on Porous Polymeric Membrane Preparation. Part I: Production Techniques with Polysulfone and Poly (Vinylidene Fluoride)

Plant Nanomaterials and Inspiration from Nature: Water Interactions and Hierarchically Structured Hydrogels

Mechanisms of Asymmetric Membrane Formation in Nonsolvent-Induced Phase Separation

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