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. Author manuscript; available in PMC: 2014 Aug 14.
Published in final edited form as: Colloids Surf B Biointerfaces. 1995 Mar 8;4(2):65–75. doi: 10.1016/0927-7765(94)01150-4

Fig. 3.

Fig. 3

Dynamic water contact angles of the quaternary amine gradient surface. Advancing/receding contact angles θadv = θrec = 0° were recorded on the silica end of the gradient surface. The quaternary amine end of the gradient surface showed θadv = 46° and θrec = 20°. The angles were not dependent on pH. A, B and C indicate the positions along the gradient at which the adhered colloidal gold particles were imaged by SEM (Fig. 4). 1–5 indicate the positions along the gradient used in the fitting of the experimental results to the two adsorbed protein populations model (Eq. (4)).