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Russo, Paul S.

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    Soft, Responsive and Semiconducting Gels
    (Georgia Institute of Technology, 2018-04-20) Rosu, Cornelia ; Russo, Paul S. ; Reichmanis, Elsa
    Interaction of biopolymers with organic electronic materials provides an appealing opportunity to design electroactive materials for use in many applications especially bioelectronics. Because of their biocompatibility, polypeptides do not act just as simple bio- components; rather they effectively influence the organization of π-conjugated polymers into highly crystalline structures that allow charge transport. The talk will focus on poly(γ-benzyl-L-glutamate), PBLG, a synthetic polypeptide that forms thermoreversible tree-dimensional networks. Blends with poly(3-hexylthiophene), P3HT, resulted in gel materials able to switch reversibly on and off their photo-physical properties. This behavior was observed during two cycles of heating-cooling-aging. Enhanced alignment of P3HT chains into J-aggregate structures, ideal for effective electronic performance, was attributed to interactions between the PBLG benzyl side chains and P3HT hexyl arms.
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    Protein-Assisted and Polypeptide-Assisted Assembly of Particles and Polymers
    (Georgia Institute of Technology, 2018-01-23) Russo, Paul S.
    Nature builds proteins for structure, function and reactivity, which attests to the versatility of placing different chemical groups on the same polymer backbone. Following this same design paradigm, synthetic polypeptides can mimic proteins under some circumstances. One of the more interesting functions is “gatherer”. Gatherer proteins and polypeptides can collect and even align other structures, such as colloidal silica or polymers. From a processing perspective, this function promises latex-like delivery of semiconducting polymers with greatly reduced use of environmentally unfriendly solvents. We also contemplate the polypeptide liquid crystal factory, in which interactions between colloidal particles and polypeptide mesogens assemble particles for covalent, photostimulated crosslinking.