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Best "Poster Prize" awarded by C’Nano PACA

Sabri Taleb,PhD student at LPMC, has been awarded the Best Poster Prize during the C’Nano PACA Workshop which took place at Porquerolles, from the 23th to the 25th of June 2014. The poster is available at the bottom of this page.

Abstract of the poster entitled "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 [1]. 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 [2]. 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 [3].

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+)

[1]. H. Bellanger, T. Darmanin, E. Taffin de Givenchy and F. Guittard, Chem. Rev., 2014, 114 (5), 2694–2716

[2]. T. Darmanin and F. Guittard, J. Prog. Polym. Sci., 2014, DOI : 10.1016/j.progpolymsci. 2013.10.003

[3]. 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