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Experimental investigation of the overlimiting current in a micro-nanochannel system : opportunities and pitfalls

Sikkink, M.A. (2015) Experimental investigation of the overlimiting current in a micro-nanochannel system : opportunities and pitfalls.

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Abstract:The investigation of Ion Concentration Polarization (ICP) phenomena has become more and more interesting due to the implications for desalination and other important industrial operations. The ability to relatively carefully control and analyze the transport of ions using charge selective interfaces, from cation or anion selective membranes to ion-selective nanochannels, is widely studied. In literature there is already a lot of numerical analysis on ICP phenomena in a system with a perm-selective interface. In this research, ICP was studied using an array of nanochannels between microchannels. Firstly, the experimental system was optimized to achieve reliable experimental results. The optimization of the set-up was done by testing applied voltages, different measurement/equilibration time and many other factors. The outcomes have shown that despite several optimization steps the results remain di�cult to reproduce. However, due to the comparison of the theoretical conductance and the experimental conductance it was shown that the nanochannels are not behaving unexpectedly from a surface charge point of view. Recommendations for a re-design are provided.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:35 chemistry
Programme:Chemical Engineering BSc (56960)
Link to this item:http://purl.utwente.nl/essays/68431
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