433791 Rapid Synthesis of Polymer-Stabilized Metal Colloids

Thursday, November 12, 2015: 10:45 AM
Canyon B (Hilton Salt Lake City Center)
Christina Tang1,2, Chris Sosa2 and Robert K. Prud'homme2, (1)Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA, (2)Chemical and Biological Engineering, Princeton University, Princeton, NJ

We present rapid, room temperature synthesis of PEG-stabilized gold nanoparticles using Flash NanoPrecipitation (FNP), a polymer directed self-assembly method.  During FNP, an aqueous solution of gold chloride is rapidly mixed with an amphiphilic PEG-based block copolymer dissolved in an organic solvent with a reducing agent, tannic acid (TA).   Upon mixing, gold chloride is reduced by TA and encapsulated by the self-assembling PEG-based block copolymer.  Simultaneous gold reduction and polymer self-assembly facilitated by the rapid mixing prevent secondary nucleation and Ostwald ripening.  The result is kinetically controlled growth and size focusing of encapsulated gold nanoparticles of uniform size (standard deviation <15%).  The size of the resulting gold nanoparticles and hydrodynamic diameter of the nanoparticle construct can be tuned by varying the pH.   We anticipate FNP will be a versatile platform for single-step, room temperature processing PEG-stabilized gold nanoparticles with tunable surface chemistry.  Continuous processing may also be possible.

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See more of this Session: Colloidal Dispersions I
See more of this Group/Topical: Engineering Sciences and Fundamentals