Adsorption of pluronic F-127 on surfaces with different hydrophobicities probed by quartz crystal microbalance with dissipation.
Triblock copolymers of polyethylene oxide (PEO) and polypropylene oxide (PPO), that is, PEOn-PPOm-PEOn, better known as Pluronic can adsorb to surfaces in either a pancake or a brushlike configuration. The brushlike configuration is advantageous in numerous applications, since it constitutes a surface repellent to proteins and microorganisms. The conformation of the adsorbed Pluronic layer depends on the hydrophobicity of the substratum surface, but the hydrophobicity threshold above which a brushlike conformation is adopted is unknown. Therefore, the aim of this study is to investigate Pluronic F-127 adsorption on surfaces with different hydrophobicities using a quartz crystal microbalance with dissipation. Adsorption in a brushlike conformation occurred on surfaces with a water contact angle above 80 degrees , as inferred from the thickness, viscosity, and elasticity of the adsorbed layer. The concentration of Pluronic F-127 in solution affected only the kinetics of adsorption and not the final layer thickness or conformation of adsorbed Pluronic molecules.
Nejadnik
M Reza
MR
Department of Biomedical Engineering, University Medical Center Groningen and University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands.
Olsson
Adam L J
AL
Sharma
Prashant K
PK
van der Mei
Henny C
HC
Norde
Willem
W
Busscher
Henk J
HJ
D000327:Adsorption; D006046:Gold / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D020442:Poloxamer / Q000737:chemistry*; D011791:Quartz; D013501:Surface-Active Agents / Q000737:chemistry; D014025:Titanium / Q000737:chemistry
D013501:Surface-Active Agents; D020442:Poloxamer; D011791:Quartz; D006046:Gold; D014025:Titanium