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Cartoon illustrating polyelectrolyte trap coating of methylene blue (MB, orange crosses) around gold nanoparticles. MB is electrostatically bound to polyacrylic acid (PAA, purple) and trapped by polyallylamine hydrochloride (PAH, dark red). Transmission electron micrographs of nanoparticle shapes and corresponding zeta potential for (a) cubes (b) spheres and (c) trisoctahedra as a function of wrapping stage.
