Agathe Lizée PhD defense - Campus De Beaulieu - ISCR - Bat. 10 B - Amphi Grandjean

Chemistry and Process Engineering (CIP) team

Abstract
Membrane separation techniques are widely used in various application sectors, mainly thanks to the considerable variety of membrane materials, structures and module configurations available. To ensure optimum separation, membrane properties must be carefully selected. Numerous characterization techniques are available to study them in depth. In particular, the calculation of zeta potential helps to understand or predict separation performance. In the case of membranes, this parameter is classically determined from tangential measurements of the streaming current or potential. However, parasitic phenomena such as the electrokinetic leakage can interfere with these measurements.
This thesis seeks to transform the vision of electrokinetic leakage, considered until now as an undesirable parasitic phenomenon, in order to demonstrate that useful information can be extracted from it. Tangential measurements (flow current and potential, electrical resistance) were used to exploit the electrokinetic leakage in the case of surface functionalization of polymer membranes with polyelectrolytes, degradation of membrane material and wetting of hydrophobic membranes. The added value provided by the electrokinetic leakage analysis has been successfully demonstrated by accessing the zeta potential inside pores and highlighting physical phenomena occurring inside the porous membrane matrix.

Jury

• Patrick Fievet, University Louis & Marie Pasteur, Besançon / Reporter

• Nicolas Jouault, Sorbonne University, Paris / Reporter

• Lydéric Bocquet, ENS, Paris / Examiner

• Christel Causserand, University of Toulouse / Examiner

• Estelle Couallier, CNRS GEPEA, Saint-Nazaire / Examiner

• Emmanuelle Filloux, CIRSEE - SUEZ, Le Pecq / Examiner

• Anthony Szymczyk, University of Rennes, ISCR / PhD Supervisor

• Patrick Loulergue, University of Rennes, ISCR / PhD Co-Supervisor

Contacts
Agathe Lizée, agathe.lizee@univ-rennes.fr
Patrick Loulergue, patrick.loulergue.1@univ-rennes.fr
Anthony Szymczyk, anthony.szymczyk@univ-rennes.fr