Xu, H.Liu, X.Su, G.Zhang, B.Wang, D.2025-12-172025-12-172012Langmuir, 2012; 28(36):13060-130650743-74631520-5827https://hdl.handle.net/1959.8/132082Polydopamine (PDA)-Au Janus particles were obtained by simply adding HAuCl4 to a PDA particle suspension, prepared via self-polymerization of dopamine in basic solution at room temperature. The structures of the PDA-Au particles are readily controlled by electrostatic repulsion between the constituent particles, which can be realized simply via adjusting the environmental pH. PDA-Au Janus particles are formed only in a narrow pH range of 2.5-3.0 due to the properly enhanced electrostatic repulsion between the Au particles growing on as-prepared PDA particles and between the Au and PDA particles. The obtained PDA-Au Janus particles can become interfacially active and self-assemble at oil/water interfaces as a result of spatially well-separated hydrophilic (PDA) and hydrophobic (Au) domains on the surfaces, reminiscent of amphiphilic molecules.enCopyright 2012 American Chemical SocietyChloridesGoldGold CompoundsIndolesPolymersMolecular StructureParticle SizeSurface PropertiesStatic ElectricityJournal article10.1021/la302394e000308839600016Xu, H. [0000-0002-9126-1593]