Self-assembled monolayers of bisphosphonates: influence of side chain steric hindrance.
Bisphosphonates form self-assembled monolayers (SAMs) spontaneously on stainless steel, silicon, and titanium oxidized surfaces. We used contact angle measurements, atomic force microscopy, and X-ray reflectivity analysis to study the formation of SAMs on a model surface of ultraflat titanium (rms = 0.2 nm). The results were extended to standard materials (mechanically polished titanium, stainless steel, and silicon) and showed that water-soluble bisphosphonic perfluoropolyether can easily form SAMs, with 100% surface coverage and a layer thickness of less than 3 nm. Hydrophobic (water contact angle >110 degrees on stainless steel or titanium) and lipophobic (methylene iodide contact angle >105 degrees on titanium) properties are discussed in terms of industrial applications.
Lecollinet
G
G
SURFACTIS Technologies, F-49100 Angers, France.
Delorme
N
N
Edely
M
M
Gibaud
A
A
Bardeau
J-F
JF
Hindré
F
F
Boury
F
F
Portet
D
D