Sabri Taleb, doctorant au LPMC, a reçu le Prix du meilleur poster lors des Journées Scientifiques du C’Nano PACA qui se sont déroulées du 23 au 25 juin à Porquerolles. Le poster est accessible en bas de cette page.
Résumé du poster intitulé "Elaboration of Smart Materials with switchable wettability by conducting polymers " (Sabri TALEB, Thierry Darmanin, Frederic Guittard) :
The development of smart materials, especially those with stimuli responsive propreties, is experiencing exponential growth for their various potential applications in biomedicine, sensors, separation membranes, textiles or shape memory materials. To reach superhydrophobic surfaces, characterized by apparent contact angles above 150°, it is necessary to produce structured surfaces . Indeed, the best strategy to obtain such materials is to structure the surface at a micro- and/or nanoscale and to have intrinsically hydrophobic materials at the extreme surface. Using conducting polymers, one of the best ways is to use the electrodeposition. Controlling the electrochemical parameters and the monomer structure, this method allowed the production of structured polymers with various surface morphologies, including fibers, spherical structures, flower-like structures or cauliflower-like structures . Here, we report the possibility to obtain superhydrophobic properties with switchable water but also oil wettability by electrochemical copolymerization of two monomers (figure 1). While EDOT-F8 was used to reach superhydrophobic properties due to the presence of the fluorinated chain, EDOT-N+ allowed to switch the water and oil wettability by ion exchange thanks to the ammonium group. We report the characterization of the wettability, morphology and roughness as a function of the mol% of EDOT-N+ after electrodeposition as well as electrochemical reduction to remove the doping anions and ion exchange thanks to the ammonium groups .
Fig. 1 : Pictures of water and diiodomethane droplets after electrodeposition, reduction by changing the voltage and ion exchange with hydrophobic Tf2N ions (here, the copolymer contains 25 % of EDOT-N+)
. H. Bellanger, T. Darmanin, E. Taffin de Givenchy and F. Guittard, Chem. Rev., 2014, 114 (5), 2694–2716
. T. Darmanin and F. Guittard, J. Prog. Polym. Sci., 2014, DOI : 10.1016/j.progpolymsci. 2013.10.003
. M. Dobbelin, R. Tena-Zaera, R. Marcilla, J. Iturri, S. Moya, J. A. Pomposo and D. Mecerreyes, Adv. Funct. Mater., 2009, 19, 3326
Fluides & Matériaux Complexes, Doctorants/Post-doctorants, Surfaces & Interfaces
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