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. Author manuscript; available in PMC: 2020 Jan 21.
Published in final edited form as: Angew Chem Int Ed Engl. 2018 Dec 18;58(4):1077–1082. doi: 10.1002/anie.201811763

Figure 2. Stretching of polymer chains along sticky locations.

Figure 2.

a, Representative F-D traces showing stretching events in the middle of plateaus. b, Histogram showing the unbinding force of stretching events (N = 306). Inset shows schematic visualization of a pDA polymer chain that is adsorbed to a surface via mostly weak interactions along its contour length with occasional strong interactions with the surface (indicated in blue). Given the heterogeneous nature of pDA, the origins of the strong interactions at sticky points are unknown, but could represent catechol, quinone or other functional groups known to be present in pDA.