QCM-D-measured adsorption of human fibrinogen (HF) onto silica-coated sensors grafted with the siloxane-control [blue solid line], PEO-silane amphiphiles (n = 3, 8, and 16) [dashed lines] and PEO-controls (n = 3, 8, and 16) [solid lines]. After equilibration for 5 min with PBS, the sensors were exposed to HF for 20 min and then to PBS for 5 min.