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. Author manuscript; available in PMC: 2011 Sep 7.
Published in final edited form as: Langmuir. 2010 Sep 7;26(17):14126–14134. doi: 10.1021/la102315j

Figure 3.

Figure 3

AFM topography images of (a, b, c, d) PU and (e, f, g, h) PS based films: (a, e) bare film (PU/PS), (b, f) oxidized film (OX-PU/OX-PS), (c, g) dextranized film in air (DEX-PU/DEX-PS) and (d, h) dextranized film in PBS buffer (DEX-PU-WET/DEX-PS-WET) for 2×2 μm2 scan size. Initially, PU surfaces show a network-like morphology that remains unaltered upon oxygen plasma treatment (OX-PU) but fades upon photochemical attachment of dextran (DEX-PU). The dextranized layer (DEX-PU) shows uneven features that turn into a smooth layer when immersed in PBS buffer (DEX-PU-WET). In contrast, PS surfaces are featureless and remain so upon oxygen plasma treatment (OX-PS). Features appear upon photochemical attachment of dextran (DEX-PS) and turn into smooth layer when immersed in PBS buffer (DEX-PS-WET).