Professor
Department of Physics
Department of Coatings and Polymeric Materials
North Dakota State University
South Engineering 212B
Fargo, ND 58105
Tel: (701) 231-7049
Fax: (701) 231-7088
erik.hobbie [at] ndsu [dot] edu

Image: (clockwise from top left) Crosslinked polydimethacrylate colloids synthesized with a permanent interfacial coating of single-wall carbon nanotubes (SWCNTs) wrapped with single-stranded DNA; A self-assembled linear crystal of individual (1 micrometer long) SWCNTs imaged with near-infrared (NIR) fluorescence microscopy; An isolated SWCNT (5 micrometers long) in NIR fluorescence microscopy; Aggregated SWCNTs (pink) on the outer membrane of an MCT3T fibroblast; NIR emission spectra of a single-stranded DNA-SWCNT suspension.

• Wrinkling, strain softening, and charge transport in single-wall carbon nanotube membranes
• Interaction of polymer-grafted nanoparticles with biological membranes
• Microscale polymer-nanocomposite particles for biomedical applications
• Thin film polymer-nanoparticle blends

• "Self-assembly of ordered nanowires in biological suspensions of single-wall carbon nanotubes", E. K. Hobbie, J. A. Fagan, M. L. Becker, S. D. Hudson, N. Fakhri, and M. Pasquali, ACS Nano 3, 189 (2009).
• "Length dependent mechanics of carbon nanotube networks", S. S. Rahatekar, S. R. Kline, E. K. Hobbie, J. W. Gilman, K. K. Koziol, and A. H. Windle, Advanced Materials 21, 874 (2009).
• "Length fractionation of carbon nanotubes using centrifugation", J. A. Fagan, M. L. Becker, J. Chun, and E. K. Hobbie, Advanced Materials 20, 1609 (2008).
• "Length dependent optical effects in single wall carbon nanotubes", J. A. Fagan, J. R. Simpson, B. J. Bauer, S. Lacerda, M. L. Becker, K. Migler, A. R. Hight Walker, and E. K. Hobbie, Journal of the American Chemical Society 129, 10607 (2007).
• "Length dependent uptake of DNA-wrapped single walled carbon nanotubes", M. L. Becker, J. A. Fagan, N. D. Gallant, B. J. Bauer, V. Bajpai, E. K. Hobbie, S. H. Lacerda, K. Migler, and J. P. Jackupchiak, Advanced Materials 19, 939 (2007) [cover article].
• "Dielectric response of aligned semiconducting single-wall nanotubes", J. A. Fagan, J. R. Simpson, B. J. Landi, L. J. Richter, I. Mandelbaum, V. Bajpai, D. L. Ho, R. Raffaelle, A. R. Hight Walker, B. J. Bauer, and E. K. Hobbie, Physical Review Letters 98, 147402 (2007).
• "Rheology of concentrated carbon nanotube suspensions", E. K. Hobbie and D. J. Fry, Journal of Chemical Physics 126, 124907 (2007).
• "Nonequilibrium phase diagram of sticky nanotube suspensions", E. K. Hobbie and D. J. Fry, Physical Review Letters 97, 036101 (2006).
• "Anisotropy of sheared carbon nanotube suspensions", D. J. Fry, B. Langhorst, H. Kim, E. A. Grulke, H. Wang, and E. K. Hobbie, Physical Review Letters 95, 038304 (2005).
• "Elastic flow instability in nanotube suspensions", S. Lin-Gibson, J. A. Pathak, H. Wang, E. A. Grulke, and E. K. Hobbie, Physical Review Letters 92, 048302 (2004).

Image: (clockwise from top left) Separated solutions of metallic (blue) and semi-conducting (yellow) SWCNTs; Wrinkling pattern of a compressed 100 nm thick SWCNT membrane on a polymer substrate; Superposition of phase contrast and NIR fluorescent images of DNA-coated SWCNTs on an MCT3T fibroblast cell; Dendritic aggregate of bile salt encapsulated SWCNTs in NIR fluorescent image; Fluorescent SWCNTs inside IMR-90 human lung fibroblasts; Hydrated hexagonal liquid crystal of bile-salts under polarized optical microscopy; Crosslinked polydimethacrylate colloids synthesized with a permanent interfacial coating of single-wall carbon nanotubes (SWCNTs) wrapped with single-stranded DNA.