Figure 3From: Effective polyethylene glycol passivation for the inhibition of surface interactions of peripheral blood mononuclear cells and platelets Contact angles on modified cover slips. The piranha treatment (yellow) decreases the contact angle relative to the cover slip after HCl treatment (green) from 20.67 ± 1.23° to a value of 12.30 ± 0.81°. The contact angle is increasing due to the PEGylation (blue) to a value of 33.11 ± 0.29°.Back to article page