Kalde, Anna ; Kamp, Johannes ; Evdochenko, Elizaveta ; Linkhorst, John ; Wessling, Matthias (2021)
Wetting-Induced Polyelectrolyte Pore Bridging.
In: Membranes, 11 (9)
doi: 10.3390/membranes11090671
Article, Bibliographie
Abstract
Active layers of ion separation membranes often consist of charged layers that retain ions based on electrostatic repulsion. Conventional fabrication of these layers, such as polyelectrolyte deposition, can in some cases lead to excess coating to prevent defects in the active layer. This excess deposition increases the overall membrane transport resistance. The study at hand presents a manufacturing procedure for controlled polyelectrolyte complexation in and on porous supports by support wetting control. Pre-wetting of the microfiltration membrane support, or even supports with larger pore sizes, leads to ternary phase boundaries of the support, the coating solution, and the pre-wetting agent. At these phase boundaries, polyelectrolytes can be complexated to form partially freestanding selective structures bridging the pores. This polyelectrolyte complex formation control allows the production of membranes with evenly distributed polyelectrolyte layers, providing (1) fewer coating steps needed for defect-free active layers, (2) larger support diameters that can be bridged, and (3) a precise position control of the formed polyelectrolyte multilayers. We further analyze the formed structures regarding their position, composition, and diffusion dialysis performance.
| Item Type: | Article |
|---|---|
| Erschienen: | 2021 |
| Creators: | Kalde, Anna ; Kamp, Johannes ; Evdochenko, Elizaveta ; Linkhorst, John ; Wessling, Matthias |
| Type of entry: | Bibliographie |
| Title: | Wetting-Induced Polyelectrolyte Pore Bridging |
| Language: | English |
| Date: | 2021 |
| Publisher: | MDPI |
| Journal or Publication Title: | Membranes |
| Volume of the journal: | 11 |
| Issue Number: | 9 |
| DOI: | 10.3390/membranes11090671 |
| Abstract: | Active layers of ion separation membranes often consist of charged layers that retain ions based on electrostatic repulsion. Conventional fabrication of these layers, such as polyelectrolyte deposition, can in some cases lead to excess coating to prevent defects in the active layer. This excess deposition increases the overall membrane transport resistance. The study at hand presents a manufacturing procedure for controlled polyelectrolyte complexation in and on porous supports by support wetting control. Pre-wetting of the microfiltration membrane support, or even supports with larger pore sizes, leads to ternary phase boundaries of the support, the coating solution, and the pre-wetting agent. At these phase boundaries, polyelectrolytes can be complexated to form partially freestanding selective structures bridging the pores. This polyelectrolyte complex formation control allows the production of membranes with evenly distributed polyelectrolyte layers, providing (1) fewer coating steps needed for defect-free active layers, (2) larger support diameters that can be bridged, and (3) a precise position control of the formed polyelectrolyte multilayers. We further analyze the formed structures regarding their position, composition, and diffusion dialysis performance. |
| Uncontrolled Keywords: | layer by layer, nanofiltration, polyelectrolyte complexation, polyelectrolyte multilayer membrane |
| Divisions: | 16 Department of Mechanical Engineering 16 Department of Mechanical Engineering > Chair for Process Engineering of Electrochemical Systems |
| Date Deposited: | 13 Sep 2023 11:13 |
| Last Modified: | 13 Sep 2023 11:13 |
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