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Degree Information:
Research Interests:
Polyelectrolytes, Polymer Solutions and Gels, Advanced Polymer Characterization Methods, Polymer-Based Sensors of Water Quality, Single Molecule Visualizations, Aqueous Polymer, Polymers in Ionic Liquids
Current Research:
Polymers and block copolymers offer unique avenues for the fabrication of nanostructured materials. Over the past decade we have been developing routes and understanding the mechanism by which the orientation of the morphology in thin block copolymer films can be controlled with exquisite precision. This has given rise to a plethora of applications of polymers in current technologies. Efforts in our group have recently focused on: developing large scale arrays of nanoscopic elements using block copolymers having exceptional long-range order and, by chemical modification of the polymer; minimizing the size scale of the elements; simplifying the fabrication process; and, by use of supercritical fluid (SCF) CO2, performing spatially-specific metallization chemistries within the microphase separate morphologies. We are currently exploring electronic, magnetic, biological and sensory applications of the scaffolds and templates that are generated. In addition, by understanding the interfacial activity of nanoparticles we are developing routes to achieve multi-length scale ordering of nanoparticles that are emerging as interesting platforms for encapsulation and diffusion barriers. By use of electrostatic pressures at polymer interfaces we are also studying the enhancement of interfacial fluctuations and routes by which the lateral length scale and amplitudes of the fluctuations can be controlled. Finally, both hydrostatic pressure and SCF CO2 are being used to control the phase behavior in entropically driven phase transitions in polymer mixtures and block copolymers, discovered in our group, and on are recently discovered closed-loop phase diagram. Optical, laser scanning confocal, electron and scanning force microscopies, and neutron (reactors and spallation sources), light and x-ray scattering (in-house and synchrotron-based) are key techniques used in these studies.
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Selected Publications:
- D. A. Chen, A. Nakahara, D. G. Wei, D. Nordlund and T. P. Russell, “P3HT/PCBM Bulk
Heterojunction Organic Photovoltaics: Correlating Efficiency and Morphology,” Nano Letters 11, 561-567, (2011). - J. Xu, T. P. Russell, B. M. Ocko and A. Checco, “Block Copolymer Self-Assembly in
Chemically Patterned Squares,” Soft Matter 7, 3915-3919, (2011). - A. Serghei, D. Chen, D. H. Lee and T. P. Russell, “Segmental dynamics of polymers during
capillary flow into nanopores,” Soft Matter 6 (6), 1111-1113, (2010). - J. Tang, H. Wang, D. Lee, M. Fardy, Z. Huo, T. P. Russell and P. Yang, “Holey Silicon as an
Efficient Thermoelectric Material,” Nano Letters 10, 4279-4283, (2010). - J. Huang, B. Davidovitch, C. Santangelo, T. P. Russell and N. Menon, “Smooth Cascade of
Wrinkles at the Edge of a Floating Elastic Film,” Physical Review Letters 105 (3), 038302/1-
038302/4, (2010). - H. D. Koh, S. Park and T. P. Russell, “Fabrication of Pt/Au Concentric Spheres from Triblock Copolymer,” ACS NANO 4(2), 1124-1130 (2010).
- J. U. Lee, J. W. Jung, T. Emrick, T. P. Russell and W. H. Jo, “Morphology Control of
Polythiopene-Fullerene Bulk Heterojunction for Enhancement of High Temperature Stability of Solar Cell Performance by a New Donor-Acceptor Diblock Copolymer,” Nanotechnology 21, 105201 (2010). - W. Chen, S. Park, J. Y. Wang and T. P. Russell, “Fabrication of Nanoporous Block Copolymer Thin Films through Medication of Interfacial Interactions with UV Cross-Linked Polystyrene," Macromolecules 42(18), 7213-7216 (2009)
- S. Park, D. H. Lee, J. Xu, B. Kim, S. W. Hong, U. Jeong, T. Xu and T. P. Russell,
“Macroscopic 10 Terabit/square inch Arrays from Block Copolymers with Lateral Order,”
Science 323(5917), 1030-1033 (2009). - T.P. Russell and D.H. Lee, “Performing Under Pressure,” Nature Nanotechnology 4(11), 703-704 (2009).
- J.L. Lutkenhaus, K. McEnnis, A. Serghei and T.P. Russell, “Confinement Effects on
Crystallization and Curie Transitions of Poly(vinylidene fluoride-co-triflouroethylene),”
Macromolecules (2009).
