Figure 21.

Soft adsorbates from a liquid phase produce sloped lines in plots of Δf/n in panel (A) and ΔΓ/n in panel (B) versus n. As opposed to the case of the soft film in air (Figure 17), the apparent mass as derived with the Sauerbrey equation is smaller than the true mass. Panel (C) shows ΔΓ/(−Δf) normalized to overtone order. ΔΓ/(−Δf)/n is proportional to ${J_{\mathrm{f}}}^{\prime }$ (Equation (54)). The slope in this log-log plot is the power law exponent ${\mathsf{\beta }}^{\prime }$ (Section 4.7). The sample is a block copolymer adsorbed to the gold surface, where the soluble part forms a brush-like structure. Data kindly shared by Anna M.C. Maan, University of Groningen, FSE-Zernike Institute for Advanced Materials.