Figure 4: Magnetic Aβ40 fibrils dispersed in aqueous continuous phase, before (A) and after (B) applying a magnetic field. The Aβ40 fibril/nanoparticle assemblies were prepared by addition of 8% (w/wAβ40) of the γ-Fe2O3 nanoparticles to Aβ40 fibrils dispersed in 1 mL 0.1M PBS (pH 7.4).