Chris Evans

Materials Postdoctoral Fellow (2013–Present)
Materials Research Laboratory
UC Santa Barbara

Ph.D Chemical Engineering / Northwestern University (2013) 
B.S Chemical Engineering / University of Minnesota (2008) 
B.S Chemistry / University of Minnesota (2008)

E-mail Chris

 

Research Interests: Polymer Physics, Dynamics, Ion Transport, Self-Assembly, Interfacial Engineering, Nanoscale characterization

Current Research Activities: My postdoctoral work at the University of California-Berkeley and University of California-Santa Barbara in the Segalman group has focused on elucidating structure-property relationships in proton-conducting, polymerized ionic liquid polymers. A key finding is that proton transport, when confined within a self-assembled block copolymer domain, can either be enhanced or suppressed relative to the conducting homopolymer. Furthermore, I have developed imidazolium-based polymers as a platform for conducting a diverse array of cations by exploiting well-known cation-imidazole complex formation to dissociate metal salts. Finally, I have developed several novel PIL structures including precise imidazolium ionenes (with the charges in the backbone) as well as polymers with bulky, fluorinated ions attached to the backbone with a free imidazolium to afford high proton conductivities.

Personal Statement: I attended the University of Minnesota where I majored in Chemical Engineering and Chemistry. I was involved with research on block copolymer phase behavior as well as solvent-less processing of nanofibers. My graduate work was performed at Northwestern University with John Torkelson where I studied polymer dynamics in thin films and polymer blends. In my free time I enjoy playing music, running, and cooking. 

Selected Publications:

  • Chang, W. B.; Fang, H.; Liu, J.; Evans, C. M.; Russ, B.; Popere, B. C.; Patel, S. N.; Chabinyc, M. L.; Segalman, R. A. “Electrochemical effects in thermoelectric polymers.” (submitted to ACS Macro Letters)

  • Sanoja, G. E.; Popere, B. C.; Beckingham, B. S.; Evans, C. M.; Lynd, N. A.; Segalman, R. A. “Structure-conductivity Relationships of Block Copolymer Membranes based on Hydrated Protic Polymerized Ionic Liquids: Effect of Domain Spacing” (submitted to Macromolecules)

  • Evans, C. M.; Sanoja, G. E.; Popere, B. C.; Segalman, R. A. “Anhydrous Proton Transport in Polymerized Ionic Liquid Block Copolymers: Roles of Block Length, Ionic Content, and Confinement” Macromolecules, 2016, 49, 395-404.

  • Chang, W. B.; Evans, C. M.; Popere, B. C.; Russ, B.; Liu, J.; Newman, J.; Segalman, R. A. “Harvesting Waste Heat in Unipolar Ion Conducting Polymers” ACS Macro Letters, 2016, 5, 94-98.

  • Cho, E. S.; Evans, C. M.; Davidson, E. C.; Hoarfrost, M.; Modestino, M.; Segalman, R. A.; Urban, J. J. “Enhanced Water Vapor Blocking in Transparent Hybrid Polymer–Nanocrystal Films.” ACS Macro Letters 2015, 4, 70-74.

  • Evans, C. M.; Singh, M. R.; Lynd, N. A.; Segalman, R. A. “Improving the gas barrier properties of Nafion via thermal annealing: Evidence for dual mode diffusion.” Macromolecules 2015, 48.

  • Evans, C. M.; Kim, S.; Roth, C. B.; Priestley, R. D.; Broadbelt, L. J.; Torkelson, J. M. “Role of Neighboring Domains in Determining the Magnitude and Direction of Tg-Confinement Effects in Binary, Immiscible Polymer Systems.” Polymer 2015, 80, 180-187.

  • Askar, S.; Evans, C. M.; Torkelson, J. M. “Residual Stress Relaxation and Stiffness in Spin-coated Polymer Films: Characterization by Ellipsometry and Fluorescence.” Polymer 2015, 76, 113-122.

  • Modestino, M. A.; Walzack, K. A.; Berger, A.; Evans, C. M.; Haussener, S.; Koval, C.; Newman, J. S.; Ager, J.; Segalman, R. A. “Robust production of purified H2 in a stable, self-regulating, and continuously operating solar fuel generator.” Energy Environ. Sci. 2014, 7, 297-301.

  • Evans, C. M., Deng, H. D., Jager, W. F., Torkelson, J. M. "Fragility is a Key Variable in Determining the Magnitude of Tg-Confinement Effects in Single Layer Films" Macromolecules 2013, 46, 6091-6103.

  • Evans, C. M., Henderson, K. J., Shull, K. R., Torkelson, J. M. "Simultaneous Determination of Critical Micelle Temperatures and Micelle Core Glass Transition Temperatures of Block Copolymer-Solvent Systems via Pyrene-Label Fluorescence." Macromolecules 2013, 46, 4131-4140.

  • Evans, C. M., Narayanan, S., Jiang, Z.; Torkelson, J. M. "Modulus, Confinement, and Temperature Effects on Surface Capillary Wave Dynamics in Bilayer Polymer Films near the Glass Transition" Physical Review Letters 2012, 109, 038302.

  • Evans, C. M., Torkelson, J. M. "Major Roles of Blend Partner Fragility and Dye-Placement on Component Glass Transition Temperature: Fluorescence Study of Near-Infinitely Dilute Species in Binary Blends." Macromolecules 2012, 45, 8319-8327.

  • Evans, C. M., Torkelson, J. M. "Determining Component Glass Transition Temperatures in Miscible Blends: Comparison of Fluorescence and Differential Scanning Calorimetry." Polymer 2012, 53, 6118-6124.

  • Evans, C. M., Sandoval, R. W., Torkelson, J. M. "Glass Transition Temperature of a Component near Infinite Dilution in Binary Polymer Blends: Determination via Fluorescence Spectroscopy" Macromolecules 2011, 44, 6645-6648.

  • Meuler, A. J., Ellison, C. J., Qin, J., Evans, C. M., Hillmyer, M. A., Bates, F. S. "Polydispersity Effects in Poly(isoprene-b-styrene-b-ethylene oxide) Triblock Terpolymers." J. Chem. Phys. 2009, 130, 234903.

  • Ellison, C. J., Meuler, A. J., Qin, J., Evans, C. M., Wolf, L. M., Bates, F. S. "Polymeric Microemulsions from Polydisperse Diblock Copolymers." J. Phys. Chem. B 2009, 113 (12), 3726-3737.

  • Meuler, A. J., Ellison, C. J., Evans, C. M., Hillmyer, M. A., Bates, F. S. "Polydispersity-Driven Transition from the Orthorhombic Fddd Network to Lamellae in Poly(isoprene-b-styrene-b-ethylene oxide) Triblock Terpolymers." Macromolecules 2007, 40, 7072-7074.