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Formulation de matériaux electrostrictifs


dans Alan LUNA, Formulation de matériaux electrostrictifs, 21ème Congrès Français de Mécanique, 26 au 30 août 2013, Bordeaux, France(FR)

Auteur(s) : LUNA, Alan

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  • Date
    • 2013
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    • Doctoral advisors: Pr A.Colin† and P. Poulin* † Laboratoire du Futur, UMR 5258 CNRS-Rhodia,178 Avenue du Dr. Schweitzer, 33608 PESSAC, France * Centre de Recherche Paul Pascal 115 Avenue du Dr Schweitzer 33600 Pessac, France During the last fifteen years, embedded systems have known a fast growth on industry. The application fields for sensors and captors are wide, such as weather database information, accelerometers and fatigue measurements. Nowadays, the main drawback for sensors and captors is long term autonomy. In order to overcome to this problem, it is possible to replace conventional batteries by transducers. The most promising approach is to recover mechanical energy from ambient vibrations to fulfill energy demands of microelectromechanicals systems (MEMS). Alternative capacity system’s composed by electrostrictive materials (i.e. for which dielectrics properties are modified under strain) shows several advantages compared to other analogues technologies such as piezoelectric or electromagnetics devices. As a matter of fact, electrostrictive materials are easily integrated to MEMS and operate at low voltages. A recent and exciting approach, to built-up such materials, is to use polymers filled by conductive nanoparticles. The aim of this project is to build a framework of carbon nanotubes (CNT) closed to the percolation threshold within an elastic polymer matrix, such as polydimethylsiloxane (PDMS). The mechanical and dielectrics properties (i.e. CNT framework) of the material will be driven by formulation levers using emulsions. Experimental results [1] have shown a huge sensibility of dielectric constant as a function of the CNT concentration, closed to the percolation threshold. Moreover, the above mentioned phenomenon should be found as well when the material undergoes a strain or bending. As a consequence, it might be possible to develop a capacitor, if the material is placed between two electrodes. [1] B. Vigolo, C. Coulon, M. Maugey, C. Zakri, P. Poulin Science 309, 920 (2005)
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    • document en accès libre : http://irevues.inist.fr/utilisation
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