4.5 Article

Wetting-Induced Polyelectrolyte Pore Bridging

期刊

MEMBRANES
卷 11, 期 9, 页码 -

出版社

MDPI
DOI: 10.3390/membranes11090671

关键词

polyelectrolyte multilayer membrane; layer by layer; nanofiltration; polyelectrolyte complexation

资金

  1. European Research Council (ERC) under the European Unions Horizon 2020 research and innovation program [694946]
  2. DFG through the Gottfried Wilhelm Leibniz Award 2019 [WE 4678/12-1]
  3. Alexander von Humboldt Foundation
  4. EU
  5. federal state of North Rhine-Westphalia [EFRE 30 00 883 02]

向作者/读者索取更多资源

The study proposes a manufacturing procedure for controlled polyelectrolyte complexation in and on porous supports by support wetting control.
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.

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