Mechanically responsive films of variable hydrophobicity made of polyelectrolyte multilayers.

Date publication

novembre 2005

Auteurs

Membres identifiés du Cancéropôle Est :
Dr VOEGEL Jean-Claude

Tous les auteurs :
Hemmerle J, Roucoules V, Fleith G, Nardin M, Ball V, Lavalle P, Marie P, Voegel JC, Schaaf P

Lien Pubmed

https://www.ncbi.nlm.nih.gov/pubmed/16262287

Résumé

Mechanically responsive surfaces that allow to switch reversibly from a hydrophobic to a hydrophilic substrate are reported. The surfaces are constituted of polyelectrolyte multilayers deposited on modified charged silicone sheets. n bilayers of poly(allylamine)-Nafion (PAH-Naf) and m bilayers of poly(allylamine)-poly(acrylic acid) (PAH-PAA) composed the multilayers. A (PAH-Naf)(n) film possesses a water contact angle of around 105 degrees, whereas the contact angle of a (PAH-Naf)(4)-(PAH-PAA)(m) multilayer is around 50 degrees. When such a film with m < 5 and terminated by PAA is stretched out, its water contact angle increases up to around 100 degrees. Successive elongation/retraction cycles allow the water contact angle to alternate reversibly between 100 and 57 degrees indicating the reversible mechanical responsive nature of the film.

Référence

Langmuir. 2005 Nov 8;21(23):10328-31.