NIST Materials Science and Engineering Laboratory - Polymers Division Staff- Erik Hobbie Polymer division banner Polymer division home page Research areas link Research projects link Research facilities link Staff contact link Search link NIST link Polymer division home page Materials Science and Engineering Laboratory

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Erik K. Hobbie , Ph.D.



 

 

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Physical Scientist

Processing Characterization
  
    Phone:
(301) 975-6774
    Fax:
(301) 975-4924
    Email:
erik.hobbie@nist.gov
    Mail:
8542
 

Research Interests

My research uses a wide variety of experimental techniques, such as light scattering, microscopy, neutron/X-ray scattering, and rheometry, to study mesoscale structure and dynamics in multiphase polymeric materials. Of particular interest is how interactions between polymers and asymmetric nanoparticles influence the physical properties of complex fluids, both in equilibrium and under the highly nonequilibrium conditions encountered during processing.

Recent Publications

77. Centrifugal length separation of carbon nanotubes, J. A. Fagan, M. L. Becker, J. Chun, P. Nie, B. J. Bauer, J. R. Simpson, A. R. Hight Walker, and E. K. Hobbie, Langmuir (submitted).

76. Magneto-photoluminescence of highly aligned SWCNT films: Identifying the role of threading magnetic flux, J. Shaver, S. A. Crooker, J. A. Fagan, E. K. Hobbie, N. Ubrig, O. Portugall, V. Perebeinos, Ph. Avouris, and J. Kono, Physical Review B 78, 081402(R), (2008).

75. Characterization of single wall nanotubes by flow-field flow fractionation, J. Chun, J. A. Fagan, E. K. Hobbie, and B. J. Bauer, Analytical Chemistry 80, 2514 (2008).

74. Chromatographic fractionation of SWNT/DNA dispersions with on-line multi-angle light scattering, B. J. Bauer, J. A. Fagan, E. K. Hobbie, J. Chun, and V. Bajpai, Journal of Physical Chemistry C 112, 1842 (2008).

73. Non-Brownian microrheology of a fluid-gel interface, E. K. Hobbie, S. Lin-Gibson, and S. Kumar, Physical Review Letters 100, 076001 (2008).

72. Length fractionation of carbon nanotubes using centrifugation, J. A. Fagan, M. L. Becker, J. Chun, and E. K. Hobbie, Advanced Materials 20, 1609 (2008).

71. Measurement of single wall carbon nanotube dispersion by size exclusion chromatography, B. J. Bauer, M. L. Becker, V. Bajpai, J. A. Fagan, E. K. Hobbie, K. Migler, C. M. Guttman, and W. R. Blair, Journal of Physical Chemistry C 111, 17914 (2007).

70. Anisotropic polarizability of specific semiconducting nanotubes from electro-optical measurements in alternating electric fields, J. A. Fagan, V. Bajpai, B. J. Bauer, and E. K. Hobbie, Applied Physics Letters 91, 213105 (2007) [Virtual Journal of Nanoscale Science and Technology 16(23), 43 (2007); Virtual Journal of Biological Physics Research 14(11), 64 (2007)].

69. 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).

68. 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].

67. 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) [Virtual Journal of Nanoscale Science and Technology 15(15), 89 (2007)].

66. Shape of the isotropic-(para)nematic coexistence curve in sheared nanotube suspensions, E. K. Hobbie, Physical Review E 75, 012501 (2007) [Virtual Journal of Nanoscale Science and Technology 15(6), 81 (2007)].

65. Rheology of concentrated carbon nanotube suspensions, E. K. Hobbie and D. J. Fry, Journal of Chemical Physics 126, 124907 (2007) [Virtual Journal of Nanoscale Science and Technology 15(14), 84 (2007)].

64. Comparative measures of single wall carbon nanotube dispersion, J. A. Fagan, B. J. Landi, I. Mandelbaum, J. R. Simpson, V. Bajpai, B. J. Bauer, K. Migler, A. R. Hight Walker, R. Raffaelle, and E. K. Hobbie, Journal of Physical Chemistry B 110, 23801 (2006).

63. Nonequilibrium phase diagram of sticky nanotube suspensions, E. K. Hobbie and D. J. Fry, Physical Review Letters 97, 036101 (2006) [Virtual Journal of Nanoscale Science and Technology 14(5), 79 (2006)].

62. Charge transport in melt-dispersed carbon nanotubes, E. K. Hobbie, J. Obrzut, S. Kharchenko, and E. A. Grulke, Journal of Chemical Physics 125, 044712 (2006) [Virtual Journal of Nanoscale Science and Technology 14(6), 81 (2006)].

61. Effect of shear flow on multi-component polymer mixtures, C. C. Han, Y. Yao, R. Zhang, and E. K. Hobbie, Polymer 47, 3271 (2006).

60. Small angle neutron scattering from labeled single wall carbon nanotubes, B. J. Bauer, E. K. Hobbie, and M. L. Becker, Macromolecules 39, 2637 (2006).

59. Breakup of carbon nanotube flocs in microfluidic traps, P. R. Start, S. D. Hudson, E. K. Hobbie, and K. B. Migler, Journal of Colloid and Interface Science 297, 631 (2006).

58. Rheo-optical studies of carbon nanotube suspensions, D. J. Fry, B. Langhorst, H. Wang, M. L. Becker, B. J. Bauer, E. A. Grulke, and E. K. Hobbie, Journal of Chemical Physics 124, 054703 (2006) [Virtual Journal of Nanoscale Science and Technology 13(6), 106 (2006)].

57. Shear SANS study of single-walled carbon nanotube suspensions, H. Wang, G. T. Christopherson, Z. Xu, L. Porcar, D. L. Ho, D. J. Fry, and E. K. Hobbie, Chemical Physics Letters 416, 182 (2005).

56. Colloidal particles coated and stabilized by DNA-wrapped carbon nanotubes, E. K. Hobbie, B. J. Bauer, J. Stephens, M. L. Becker, P. McGuiggan, S. D. Hudson, and H. Wang, Langmuir 21, 10284 (2005).

55. 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) [Virtual Journal of Nanoscale Science and Technology 12(4), 98 (2005)].

54. Small-angle neutron scattering study of dispersing single-walled carbon nanotubes with surfactants, H. Wang, W. Zhou, D. L. Ho, K. I. Winey, J. E. Fischer, C. Glinka, and E. K. Hobbie, Nano Letters 4, 1789 (2004).

53. Optical anisotropy of nanotube suspensions, E. K. Hobbie, Journal of Chemical Physics 121, 1029 (2004) [Virtual Journal of Nanoscale Science and Technology 10(1), 31 (2004)].

52. Ubiquity of domain patterns in sheared viscoelastic fluids, E. K. Hobbie, S. Lin-Gibson, H. Wang, J. A. Pathak, and H. Kim, Physical Review E 69, 061503 (2004).

51. Shear-induced microstructural orientation in polymer-clay nanocomposite solutions, S. Lin-Gibson, G. Schmidt, H. Kim, C. C. Han, and E. K. Hobbie, Journal of Colloid and Interface Science 274, 515 (2004).

50. 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) [Virtual Journal of Nanoscale Science and Technology 9(5), 8 (2004); Erratum - Physical Review Letters 92, 239901 (2004)].

49. Orientation of platelets in multilayered nanocomposite polymer films, M. M. Malwitz, S. Lin-Gibson, E. K. Hobbie, P. D. Butler, and G. Schmidt, Journal of Polymer Science: Part B: Polymer Physics 41, 3237 (2003).

48. Shear-induced mesostructure in nanoplatelet-polymer networks, S. Lin-Gibson, G. Schmidt, H. Kim, C. C. Han, and E. K. Hobbie, Journal of Chemical Physics 119, 8080 (2003).

47. Kinetic pathway of the bilayered-micelle to perforated lamellae transition, H. Wang, M. Nieh, E. K. Hobbie, C. J. Glinka, and J. Katsaras, Physical Review E 67, 060902(R) (2003) [Virtual Journal of Biological Physics Research 6(1), 9 (2003)].

46. Amphiphobic carbon nanotubes as macroemulsion surfactant, H. Wang and E. K. Hobbie, Langmuir 19, 3092 (2003).

45. Orientation of carbon nanotubes in a sheared polymer melt, E. K. Hobbie, H. Wang, H. Kim, S. Lin-Gibson, and E. A. Grulke, Physics of Fluids 15, 1196 (2003) [Virtual Journal of Nanoscale Science and Technology 7(15), 45 (2003)].

44. Optical measurements of structure and orientation in sheared carbon-nanotube suspensions, E. K. Hobbie, H. Wang, H. Kim, C. C. Han, E. A. Grulke, and J. Obrzut, Review of Scientific Instruments 74, 1244 (2003) [Virtual Journal of Nanoscale Science and Technology 7(11), 46 (2003)].

43. Shear-induced structure in polymer blends with viscoelastic asymmetry, E. K. Hobbie, H. S. Jeon, H. Wang, H. Kim, D. J. Stout, and C. C. Han, Journal of Chemical Physics 117, 6350 (2002) [Erratum - Journal of Chemical Physics 118, 4331 (2003)].

42. Anisotropic ordering in sheared binary fluids with viscous asymmetry: computer simulation and experiment, Z. Shou, H. S. Jeon, A. Chakrabarti, and E. K. Hobbie, Physical Review E 65, 041508 (2002).

41. Competing kinetics in simultaneously crystallizing and phase-separating polymer blends, H. Wang, K. Shimizu, H. Kim, Z. Wang, E. K. Hobbie, and C. C. Han, Journal of Chemical Physics 116, 7311 (2002).

40. Phase diagram of a nearly isorefractive polyolefin blend, H. Wang, K. Shimizu, E. K. Hobbie, Z. G. Wang, J. C. Meredith, A. Karim, E. J. Amis, B. S. Hsiao, E. T. Hsieh, and C. C. Han, Macromolecules 35, 1072 (2002).

39. Shear viscosity of phase-separating polymer blends with viscous asymmetry, H. S. Jeon and E. K. Hobbie, Physical Review E 63, 061403 (2001) [Erratum - Physical Review E 64, 049901(E) (2001)].

38. Multiple lateral length scales in phase-separating thin film polymer blends, H. Wang, R. J. Composto, E. K. Hobbie, and C. C. Han, Langmuir 17, 2857 (2001).

37. Phase inversion of polybutadiene/polyisoprene blends under quiescent and shear conditions, H. S. Jeon, A. I. Nakatani, E. K. Hobbie, and C. C. Han, Langmuir 17, 3087 (2001).

36. Internal dynamics and elasticity of confined entropic gels, E. K. Hobbie and A. D. Stewart, Physical Review E 61, 5540 (2000).

35. Laser-pulse technique for measuring the thermal diffusivity of substrate supported polymer films, E. K. Hobbie and A. S. DeReggi, Review of Scientific Instruments 70, 4356 (1999).

34. Depletion-driven phase separation and reversible aggregation in confined colloidal mixtures, E. K. Hobbie, Langmuir 15, 8807 (1999).

33. In-line study of droplet deformation in polymer blends in channel flow, K. B. Migler, E. K. Hobbie, and F. Qiao, Polymer Engineering and Science 39, 2282 (1999).

32. Vorticity elongation in polymeric emulsions, E. K. Hobbie and K. B. Migler, Physical Review Letters 82, 5393 (1999).

31. Metastability and depletion driven aggregation, E. K. Hobbie, Physical Review Letters 81, 3996 (1998).

30. Equilibrium structure of hydrogen-bonded polymer blends, C. Zhou, E. K. Hobbie, B. J. Bauer, and C. C. Han, Journal of Polymer Science: Part B: Polymer Physics, 36, 2745 (1998).

29. Light scattering and optical microscopy as in-line probes of polymer blend extrusion, E. K. Hobbie, K. B. Migler, C. C. Han, and E. J. Amis, Advances in Polymer Technology 17, 307 (1998).

28. Control of interaction strength in hydrogen-bonded polymer blends via the density of the hydroxyl group, C. Zhou, E. K. Hobbie, B. J. Bauer, L. Sung, M. Jiang, and C. C. Han, Macromolecules 31, 1937 (1998).

27. Pattern formation and scaling in critical polymer mixtures under simple shear flow, S. Kim, E. K. Hobbie, J.-W. Yu, and C. C. Han, Il Nuovo Cimento D 20, 2303 (1998).

26. Depletion force kinetics in confined colloidal mixtures, E. K. Hobbie and M. J. Holter, Journal of Chemical Physics 108, 2618 (1998).

25. Shear-induced order in a homopolymer blend with block-copolymer surfactant, A. I. Nakatani, L. Sung, E. K. Hobbie, and C. C. Han, Physical Review Letters 79, 4693 (1997).

24. Shear-induced "homogenization" of a diluted polymer blend, J.-W. Yu, J. F. Douglas, E. K. Hobbie, S. Kim, and C. C. Han, Physical Review Letters 78, 2664 (1997).

23. Droplet breakup and shear-induced mixing in critical polymer blends, S. Kim, E. K. Hobbie, J. Yu, and C. C. Han, Macromolecules 30, 8245 (1997).

22. Light-scattering photometer with optical microscope for the in-line study of polymer extrusion, S. Li, K. Migler, E. K. Hobbie, H. Kramer, C. C. Han, and E. J. Amis, Journal of Polymer Science: Part B: Polymer Physics 35, 2935 (1997).

21. Kinetics of size segregation in quasi-two-dimensional nearly-hard-sphere mixtures, E. K. Hobbie, Physical Review E 55, 6281 (1997).


 
 
 
 
NIST Materials Science & Engineering Laboratory - Polymers Division