Electrostatic repulsion-controlled formation of polydopamine-gold Janus particles
Date
2012
Authors
Xu, H.
Liu, X.
Su, G.
Zhang, B.
Wang, D.
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Journal article
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Langmuir, 2012; 28(36):13060-13065
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Abstract
Polydopamine (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.
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Copyright 2012 American Chemical Society