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Nanoparticle-decorated honeycomb-structured polymeric films via breath figures with Janus particles

Miller, Sophie E. and Sun, Wei and Kornfield, Julia A. (2014) Nanoparticle-decorated honeycomb-structured polymeric films via breath figures with Janus particles. In: 247th ACS National Meeting & Exposition, March 16-20, 2014, Dallas, TX.

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Microporous polymer scaffolds decorated with nanoparticles could provide functional membranes that are needed in solar-to-fuel technologies. Therefore, efficient prodn. processes are needed for high surface area, porous membranes with distinct catalytic nanoparticles on opposite sides of a support that resists oxidn. and separates the products, e.g., hydrogen and oxygen. Breath figure (BF) patterning is an established method to create microstructured honeycomb-patterned porous polymer films. This research shows that surfaceactive nanoparticles can self-assemble onto the interfaces between the templating BF water droplets and the polymer soln. to control micrometer and nanometerscale hierarchical structure. Here, amphiphilic "Janus" nanoparticles serve as both solid surfactants and Pickering emulsion stabilizing agents, thus able to optimize ordering degree of the honeycomb structures and nanoparticle enrichment in the pore walls. Janus nanoparticles were synthesized using literature methods (with improvements that will be presented): functionalizing only the exposed surface of particles embedded on the surface of wax microspheres (colloidosomes) renders half of the particle hydrophobic. They were then employed in the BFs templating method for the first time, resulting in regular, porous films with uniform, high nanoparticle d. Humble materials (silica and polystyrene) demonstrate the method, and can now be replaced by catalyst nanoparticles (e.g., nickel, molybdenum sulfide, or cobalt-based) embedded in a semiconducting polymer to create membranes for photocatalytic water splitting.

Item Type:Conference or Workshop Item (Paper)
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Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2014 American Chemical Society.
Record Number:CaltechAUTHORS:20140422-090849228
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45102
Deposited By: Tony Diaz
Deposited On:22 Apr 2014 20:33
Last Modified:03 Oct 2019 06:26

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