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. Author manuscript; available in PMC: 2015 Nov 13.
Published in final edited form as: Environ Sci Technol. 2015 Aug 12;49(17):10642–10650. doi: 10.1021/acs.est.5b01841

Figure 4.

Figure 4

Association of MPNH2-AuNPs with bilayers containing (a) rough or (b) smooth LPS. Normalized maximum frequency shifts for the 5th harmonic (Δf5/5) during nanoparticle-bilayer exposure are displayed. Calculation of mole percent LPS content assumed three Kdo molecules per smooth LPS molecule and two Kdo molecules per smooth LPS molecule.45,46 Error bars represent one standard deviation (n = 3). (c,d) The harmonic-dependence of Δfn and the energy dissipation factor (ΔDn), where n is the harmonic number, is more pronounced for MPNH2-AuNPs interacting with bilayers containing rough LPS (panel c) than smooth LPS (panel d).19 Experiments were performed in 0.002 M HEPES (pH 7.4) and 0.025 M NaCl.