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Fig. 6 | Journal of Biological Engineering

Fig. 6

From: Influence of gold nanoparticle surface chemistry and diameter upon Alzheimer’s disease amyloid-β protein aggregation

Fig. 6

Effect of NP surface charge on local solution pH and charge density. The equilibrium molecular organization near the surface of NPs was modeled using a SCMFT incorporating water, hydronium, hydroxide, chloride, and Tris. Theoretical calculations were performed for 18 nm NPs in the presence of 40 mM Tris–HCl (pH 8.0) for NPs exhibiting a positive (black lines) or negative (grey lines) surface charge with absolute surface charge (σq) magnitudes of 4 e/nm2 (solid lines), 1 e/nm2 (dashed lines), or 0.1 e/nm2 (dotted lines). Local solution pH (panel a) and charge density (ρq) (panel b) are plotted as a function of distance from the NP surface

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