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Thin Photocatalytic TiO 2 Coatings: Impact on Bioadhesion and Cell Viability
Author(s) -
Allion Audrey,
Merlot Marie,
BoulangéPetermann Laurence,
Archambeau Catherine,
Choquet Patrick,
Damasse JeanMichel
Publication year - 2007
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.200731003
Subject(s) - photocatalysis , materials science , adhesion , irradiation , viability assay , coating , bacteria , chemical engineering , contact angle , composite material , cell , chemistry , organic chemistry , catalysis , biology , biochemistry , engineering , physics , genetics , nuclear physics
On stainless steel, TiO 2 films allowed us to modify its hydrophilic character with a UV stimuli. After a UV irradiation time of 20 min, the water contact angle on both films (250 and 500 nm) decreased from 100° to 5° and remains stable up to 2 h after stopping the UV exposure. As a consequence, TiO 2 induces a significant decrease in the bacterial adhesion level. Moreover, this coating leads to smaller clusters of adhering cells (less than 10 bacteria per cluster instead of over than 1 000 bacteria per cluster on bare steel). Both TiO 2 coatings were also photocatalytic with an efficiency proportional to the thickness. It leads to antibacterial effect on adhering cells. TiO 2 layers induce a significant decrease in the viability of adhering cells in comparison with the bare steel; it decreases from 80 to 20%.