University of Twente Student Theses


Investigation of immiscible liquid-liquid displacement in Slippery Liquid Infused Membranes (SLIM)

Eijsker, J. (2017) Investigation of immiscible liquid-liquid displacement in Slippery Liquid Infused Membranes (SLIM).

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Abstract:A bachelor assignment was performed with the Soft matter, Fluidics and Interfaces (SFI) group at the University of Twente. Research is being carried out on slippery liquid infused membranes (SLIMs): the presence of an intermediary, immiscible liquid prevents direct contact between the permeate and the membrane wall by coordinating multiphase transport through the pores. It has been shown that these systems exhibit promising anti-fouling properties for relatively clean water. The goal of the assignment: to learn more about the stability of SLIMs under more extreme conditions, i.e. surfactant solutions. In this research, porous PVDF membranes are fabricated, characterised using SEM and gas-liquid displacement porometry and infused with slippery liquids (Krytox 101 or silicone oil AR20). Most importantly, liquid-liquid displacement (LLDP) experiments are performed with several non-ionic and ionic surfactant solutions to observe the stability of the system. These surfactants are Triton X100 (non-ionic), SDS (anionic), CTAB (cationic) and DDAPS (zwitterionic), common surfactants below or at CMC. Finally, the LLDP measurements are reproduced using a microfluidic chip and a Laser Confocal Scanning Microscope (LCSM), to observe and analyse the displacement phenomenon that occurs with surfactant solutions in SLIMs. The SLIM stability with surfactant solutions is demonstrated. The LCSM experiments reveal a swift removal of the oil bulk, but a final saturation value of water below 100% that is rather stable (between 0.8 and 0.95, depending on the displacing surfactant solution). Likewise, the LLDP results confirm that a certain amount of infusion liquid is retained up to the highest fluxes for all surfactant solutions.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:35 chemistry
Programme:Chemical Engineering BSc (56960)
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