New details of assembling bioactive films from dispersions of amphiphilic molecules on titania surfaces
Leonardo Francisco Gonçalves Dias, Stephani Stamboroski, Michael Noeske, Dirk Salz, Klaus Rischka, Renata Pereira, Maria C. Mainardi, Marina Honorato Cardoso, Martin Wiesing, Érika Soares Bronze‐Uhle, Rodrigo Barros Esteves Lins, Paulo Noronha Lisboa‐Filho
Abstract
to reveal the antibacterial properties effected by the surface modification. Immediately after sputter deposition, titania was hydrophilic; however, after air storage and adsorption of DMOAP or ODPA, an increase in the water contact angle was observed. XPS investigations after layer formation and after antibacterial tests revealed that the attachment of layers assembled from ODPA on titania substrates is considerably stronger and more stable than that observed for DMOAP films. Heat treatment strongly affects DMOAP layers. Furthermore, DMOAP layers are not stable under biological conditions.