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A. Annexe and . Les, 1 Composition Les microcanaux sont fabriquésfabriquésà partir d'un polymère, Le polymère utilisé au laboratoire est le polydiméthysiloxane (PDMS, Sylgard 184), dont la formule chimique est (H 3 C)[SiO(CH 3 ) 2 ] n Si

P. La-technique-utilisée-pour-concevoir-et-fabriquer-les, est issue de l'industrie microélectronique. La photolithographie s'inspire de la lithographie, technique d'impression du 18èmesì ecle qui permettait d'imprimer plusieurs copies d'un motif en pressant des feuilles de papier contre une pierre calcaire. Sur cettedernì ere, des motifs d'impression avaientété avaientété préalablement tracéstracésà l'encre où a l'aide d'un crayon gras

A. Elles-sont-présentées-sur-la-figure, 1 et sont décrites dans les paragraphes suivants Notons que notre procédé ne comprend pas l'´ etape de lithographie souple, qui consistè a mouleràmoulerà partir des structures en PDMS (microcanaux ou autre type de forme) de nouvellespì eces en polymère, 1998.