• Nano-Enabled Water Technologies

Invited SpeakersProfile Details

Prof.  Wiebe De Vos
Prof. Wiebe De Vos Dr. Wiebe De Vos is an associate professor at The University of Twente, where he initiated and now leads the research group “Membrane Surface Science” (MSuS). Within his group, Dr. de Vos combines his background in the fundamentals of surface science and physical chemistry with the more applied field of membranes.

Biography

Dr. Ir. Wiebe M. de Vos obtained his Ph.D. in 2009 from Wageningen University on the topic of "Polymer Brushes": Dense layers of surface-grafted polymers that have great potential as anti-fouling coatings. He subsequently moved to Bristol University, where he studied the structure and properties of a variety of surface coatings, such as polyelectrolyte multilayers, lipid bi-layers and responsive polymer brushes. In 2012 he moved to the University of Twente, where he initiated and now leads the research group "Membrane Surface Science" (MSuS). Within his group, Dr. de Vos combines his background in the fundamentals of surface science and physical chemistry with the more applied field of membranes. His work in encompasses the coating of membranes for various functional enhancements, including anti-fouling, enhanced separations, easy-to-clean membranes and virus inactivation, but also entails building up a detailed understanding on the exact interactions between the membrane interface and selected molecules and particles. Dr. de Vos has been successful in obtaining grant income from various sources, including the prestigious personal VENI and VIDI grants from the Dutch Science Foundation, and a personal ERC-starting grant. Currently dr. de Vos supervises 10 Ph.D. students and three postdocs.  Dr. de Vos published 58 scientific manuscripts and 3 scientific book chapters. He has received over 900 citations and has an H-index of 18. 

All sessions by Prof. Wiebe De Vos

  • Day 1Monday, January 28th
11:00 am

Polyelectrolyte self-assembly for the next generation of membranes: From ultra-thin coatings to complete membranes

The intensification of the use and reuse of fresh water resources comes at a cost. Reports on rising levels of emerging contaminants in our water are numerous. New and better membranes are urgently needed to come to better and more sustainable water treatment processes. Over the past decade polyelectrolyte multilayers have established themselves as one of the most promising new materials in membrane Science and Technology. Novel nanofiltration membranes are prepared by the self-assembly of oppositely charged polyelectrolytes at the interfaces of a porous ultrafiltration support membrane. In this so-called Layer-by-Layer (LbL) assembly, the support membrane is alternatively exposed to polycations and polyanions, to build polyelectrolyte multilayer’s (PEMs) of controllable thickness. After coating the separation properties of the membrane are completely determined by the applied PEM layer.
In this contribution, we will discuss how a novel approach to PEM membrane preparation can lead to membranes with unique separation properties. We present a membrane that can retain small organics at high fluxes, while allowing ions to easily pass through the membrane. The unique membrane properties also allow for new processes to more efficiently treat both surface and waste water.
And we can even push this one step further. By a carefully controlled 1-step precipitation process, we can prepare polyelectrolyte complex based membranes, where the polyelectrolyte complex functions as the porous support membrane and as the dense separation layer. The preparation process is performed completely in water, without requiring any organic solvents. The separation performance of the new membranes is very comparable to that of the PEM based membranes that were produced using a multi-step coating method.

Auditorium between bldg. 4 & 5, level 0 11:00 - 11:30 Details