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Membranes
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Polymeric Porous Membranes
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Polymeric Porous Membranes

A special issue of Membranes (ISSN 2077-0375). This special issue belongs to the section "Polymeric Membranes".

Deadline for manuscript submissions: closed (31 December 2018)

Special Issue Editor

Dr. Volkan Filiz

E-Mail Website
Guest Editor
Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str.1, 21502 Geesthacht, Germany
Interests: synthesis of new monomers and tailor-made polymers for membrane applications in gas- and liquid-phase separation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Separation using polymer membranes is one of the most promising, cost-effective, and energy-efficient ways, e.g., for seawater desalination, surface water purification and recycling homogenous catalysts in chemical synthesis. Polymer membranes have been used in gas, as well as in liquid, separation fields for many years, and recent tremendous developments have led to significant achievements in both fields. Tailor-made polymer membranes with sharp molecular weight cut-offs and high fluxes based on their structure, are essential for almost all types of separation processes. This development needs to continue, as this is the only way to assist membrane research to deal with present critical problems of our society, such as, water pollution, shortages in drinking water, or retrieving solvents or catalysts from the chemical and pharmaceutical industry.

This Special Issue aims to deliver new insights and report on recent progress in the field of porous polymer membranes for separation processes, and we also aim to present new ideas and achievements. It provides not only solutions for current problems, but also the necessary inspiration for future generations. An important aspect of this Special Issue will be switchable stimuli-responsive membranes, based on synthesis, post-functionalization, etc., leading to as one example, a reduced fouling behaviour.

Authors are welcome to submit their latest results in the form of original full articles, communications or reviews of this wide topic.

Dr. Volkan Filiz
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Membranes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Porous Membranes
  • Block Copolymers
  • Polymer Synthesis
  • Mixed Matrix Membranes
  • Stimuli Responsive Membranes
  • Post-Modified Membranes
  • Membrane Fouling
  • Organic Solvent Nanofiltration
  • Oil/Water Separation

Published Papers (3 papers)

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Research

15 pages, 2883 KiB  
Article
From “Black Box” to a Real Description of Overall Mass Transport through Membrane and Boundary Layers
by Endre Nagy and Márta Vitai
Membranes 2019, 9(2), 18; https://doi.org/10.3390/membranes9020018 - 23 Jan 2019
Cited by 3 | Viewed by 3100
Abstract
The “black box” model defines the enhancement, E the polarization modulus, C ∗ / C o and the intrinsic enhancement, E o without knowing the transport mechanism in the membrane. This study expresses the above-mentioned characteristic parameters, simultaneously taking into account the mass [...] Read more.
The “black box” model defines the enhancement, E the polarization modulus, C ∗ / C o and the intrinsic enhancement, E o without knowing the transport mechanism in the membrane. This study expresses the above-mentioned characteristic parameters, simultaneously taking into account the mass transport expressions developed for both the polarization and the membrane layers. Two membrane models are studied here, namely a solution-diffusion model characterizing solute transport through a dense membrane and a solution-diffusion plus convection model characterizing transport through a porous membrane due to transmembrane pressure difference. It is shown that the characteristic parameters of the “black box” model (E, E o or C ∗ / C o ) can be expressed as a function of the transport parameters and independently from each other using two-layer models. Thus, membrane performance could be predicted by means of the transport parameters. Several figures show how enhancement and the polarization modulus varied as a function of the membrane Peclet number and the solubility coefficient. Enhancement strongly increased up to its maximum value when H > 1, in the case of transport through a porous membrane, whereas its change remained before unity in the case of a dense membrane. When the value of H < 1, the value of E gradually decreased with increasing values of the membrane Peclet number. Full article
(This article belongs to the Special Issue Polymeric Porous Membranes)
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22 pages, 12437 KiB  
Article
Formation of Thin, Isoporous Block Copolymer Membranes by an Upscalable Profile Roller Coating Process—A Promising Way to Save Block Copolymer
by Thomas Bucher, Volkan Filiz, Clarissa Abetz and Volker Abetz
Membranes 2018, 8(3), 57; https://doi.org/10.3390/membranes8030057 - 06 Aug 2018
Cited by 32 | Viewed by 9435
Abstract
In this work we present a method to manufacture flat sheet membranes with a thin isoporous block copolymer (BCP) layer (thickness <3 µm) by profile roller coating (breadth: 30 cm) on top of a porous support membrane. Highly diluted BCP-solutions were used for [...] Read more.
In this work we present a method to manufacture flat sheet membranes with a thin isoporous block copolymer (BCP) layer (thickness <3 µm) by profile roller coating (breadth: 30 cm) on top of a porous support membrane. Highly diluted BCP-solutions were used for this coating process. While we cast membranes with dimensions of 30 cm × 50 cm in this work, the procedure can easily be extended to endless dimensions in this roll to roll (R2R) process. The method offers the possibility to save >95% of BCP raw material compared to common doctor blade casting, by strongly decreasing the layer thickness to below 3 µm in combination with a highly open substructure. Additionally, we report a straightforward method to investigate the influence of the solvent evaporation time between coating and precipitation (phase inversion) on the membrane morphology using one sample only, which also ensures that all other influencing parameters remain constant. Full article
(This article belongs to the Special Issue Polymeric Porous Membranes)
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16 pages, 4645 KiB  
Article
Hollow Fiber Membranes of Blends of Polyethersulfone and Sulfonated Polymers
by Nazia Noor, Joachim Koll, Nico Scharnagl, Clarissa Abetz and Volker Abetz
Membranes 2018, 8(3), 54; https://doi.org/10.3390/membranes8030054 - 02 Aug 2018
Cited by 18 | Viewed by 6911
Abstract
Hollow fiber membranes (HFM) are fabricated from blend solutions of a polyethersulfone (PESU) with a sulfonated PESU (sPESU) or a sulfonated polyphenylenesulfone (sPPSU). The influence of different additives in the dope solution and different bore fluids on the HFM are studied. The addition [...] Read more.
Hollow fiber membranes (HFM) are fabricated from blend solutions of a polyethersulfone (PESU) with a sulfonated PESU (sPESU) or a sulfonated polyphenylenesulfone (sPPSU). The influence of different additives in the dope solution and different bore fluids on the HFM are studied. The addition of poly(sodium 4-styrene sulfonate) (PSSNa)/ethylene glycol (EG) to the dope solution results in an increased water flux of the HFM compared to its counterparts without this additive system. The morphology of the hollow fibers is examined by scanning electron microscopy (SEM). The inner surface of the hollow fibers is studied by X-ray photoelectron spectroscopy (XPS), and it is found that water permeation through the hollow fiber membranes is facilitated due to the change in morphology upon the addition of the PSSNa/EG additive system, but not by the presence of hydrophilic sulfonic acid groups on the membrane surface. Full article
(This article belongs to the Special Issue Polymeric Porous Membranes)
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