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)
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.
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.