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. 2017 Apr 5;2(4):1309–1320. doi: 10.1021/acsomega.7b00007

Figure 3.

Figure 3

Real-time binding curves for frequency Δf3/3 and dissipation ΔD3 during the adsorption of phosphonic acid PEG copolymers onto Fe3O4 substrates at pH 2.0. PEG pending side chains have molecular weights of 1000 g mol–1 (a, b), 2000 g mol–1 (c, d), and 5000 g mol–1 (e, f). The data are those from the third overtone of the QCM-D acoustic device. In each panel, the first arrow at t = 0 denotes the time at which the polymer solution (concentration 0.1 wt %) is injected. The second arrow denotes the time at which DI water (pH 7.4) is introduced for rinsing. (g) Histogram for the steady-state frequencies upon polymer adsorption and rinsing.