Ranko Richert

Ranko Richert received his Ph.D. degree from the University of Marburg, Germany, in 1985, and the Habilitation degree in physical chemistry in 1991. He worked as a Postdoctoral Fellow at Tel Aviv University, Israel, in 1993, and as a Senior Research Associate at the Max Planck Institute for Polymer Research in Mainz, Germany, from 1993 to 1999. In 1994, he was a Lecturer at the Department of Physical Chemistry at the University of Mainz before joining the Arizona State University Faculty in 1999. He is currently an Associate Professor of chemistry and biochemistry at Arizona State University. The experimental research in this group adresses the physical chemistry of soft condensed matter by optical spectroscopy (triplet state solvation dynamics) and by linear and nonlinear dielectric relaxation experiments. This research is aimed at understanding the relaxation and transport phenomena in disordered materials and how they relate to the structure, length scale, dynamics, and interactions. The research topics cover the phenomena associated with glass transitions, interfacial effects, geometric confinement, relaxation and retardation processes, details of the molecular dynamics, spatial heterogeneities, nanoscopic heatflow, and the relation between macroscopic and microscopic properties.

Biography Updated on 16 March 2008

Personal Home Page

http://www.public.asu.edu/~ranko

Articles in Scholarly Journals [Incomplete List]

  1. Solvation Dynamics and Electric Field Relaxation in an Imidazolium-PF6 Ionic Liquid: from Room Temperature to the Glass Transition
    Journal of Physical Chemistry B, vol. 111, no. 18, pp. 5016–5022, 2007
  2. Glass Transition Dynamics and Boiling Temperatures of Molecular Liquids and Their Isomers
    Journal of Physical Chemistry B, vol. 111, no. 12, pp. 3201–3207, 2007
  3. Comparing calorimetric and dielectric polarization modes in viscous 2-ethyl-1-hexanol
    The Journal of Chemical Physics, vol. 126, no. 10, p. 104503, 2007
  4. Wide frequency range capacitive detection of loss in a metallic cantilever using resonance and relaxation modes
    Review of Scientific Instruments, vol. 78, no. 5, p. 053901, 2007
  5. Nonlinear features in the dielectric behavior of propylene glycol
    Physical Review B, vol. 75, no. 6, 2007
  6. Enhanced diffusivity in supercooled liquids
    New Journal of Physics, vol. 9, no. 2, pp. 36–36, 2007
  7. Measuring the Configurational Heat Capacity of Liquids
    Physical Review Letters, vol. 99, no. 18, 2007
  8. Probing heterogeneous thermal relaxation by nonlinear dielectric spectroscopy
    Journal of Physics: Condensed Matter, vol. 19, no. 20, p. 205128, 2007
  9. Primary and secondary relaxation time dispersions in fragile supercooled liquids
    Physical Review B, vol. 76, no. 6, 2007
  10. Nonlinear Dielectric Response and Thermodynamic Heterogeneity in Liquids
    Physical Review Letters, vol. 97, no. 9, 2006
  11. Solvation dynamics in viscous polymer solution: Propylene carbonate confined by poly(methylmethacrylate)
    Physical Review B, vol. 74, no. 1, 2006
  12. Fragility and thermodynamics in nonpolymeric glass-forming liquids
    The Journal of Chemical Physics, vol. 125, no. 7, p. 074505, 2006
  13. Enhanced translational diffusion of rubrene in sucrose benzoate
    The Journal of Chemical Physics, vol. 124, no. 1, p. 014510, 2006
  14. Dynamics of glass-forming liquids. XI. Fluctuating environments by dielectric spectroscopy
    The Journal of Chemical Physics, vol. 124, no. 16, p. 164510, 2006
  15. Response to “Comment on ‘On the dielectric susceptibility spectra of supercooled o-terphenyl’” [J. Chem. Phys. 123, 154502 (2005)]
    The Journal of Chemical Physics, vol. 124, no. 18, p. 187102, 2006
  16. Solvent response and dielectric relaxation in supercooled butyronitrile
    The Journal of Chemical Physics, vol. 125, no. 2, p. 024504, 2006
  17. Relaxational features of supercooled and glassy m-toluidine
    Journal of Non-Crystalline Solids, vol. 352, no. 42-49, pp. 4729–4734, 2006
  18. From heterogeneous probe rotation to the hydrodynamic limit
    Journal of Non-Crystalline Solids, vol. 352, no. 42-49, pp. 4704–4709, 2006
  19. The Journal of Physical Chemistry B, vol. 110, no. 9, pp. 4371–4377, 2006
  20. The Journal of Physical Chemistry B, vol. 109, no. 49, pp. 23255–23262, 2005
  21. The Journal of Physical Chemistry B, vol. 109, no. 18, pp. 8767–8773, 2005
  22. Dielectric responses in disordered systems: From molecules to materials
    Journal of Non-Crystalline Solids, vol. 351, no. 33-36, pp. 2716–2722, 2005
  23. Dynamics of glass-forming liquids. X. Dielectric relaxation of 3-bromopentane as molecular probes in 3-methylpentane
    The Journal of Chemical Physics, vol. 123, no. 16, p. 164504, 2005
  24. The Journal of Physical Chemistry B, vol. 109, no. 22, pp. 11091–11094, 2005
  25. Identification of dielectric and structural relaxations in glass-forming secondary amides
    The Journal of Chemical Physics, vol. 123, no. 5, p. 054516, 2005
  26. Heterogeneous thermal excitation and relaxation in supercooled liquids
    The Journal of Chemical Physics, vol. 123, no. 22, p. 224506, 2005
  27. Triplet excitation transfer in glassy systems: Spatial and spectral diffusion
    The Journal of Chemical Physics, vol. 122, no. 23, p. 234508, 2005
  28. Effect of dispersion on the relaxation-retardation time scale ratio
    The Journal of Chemical Physics, vol. 123, no. 10, p. 106101, 2005
  29. Dynamics of glassy and liquid m-toluidine investigated by high-resolution dielectric spectroscopy
    The Journal of Chemical Physics, vol. 122, no. 8, p. 084508, 2005
  30. Dynamics of supercooled liquids in the vicinity of soft and hard interfaces
    Physical Review B, vol. 71, no. 14, 2005
  31. On the dielectric susceptibility spectra of supercooled o-terphenyl
    The Journal of Chemical Physics, vol. 123, no. 15, p. 154502, 2005
  32. Dielectric Studies Deny Existence of Ultraviscous Fragile Water
    Physical Review Letters, vol. 93, no. 21, 2004
  33. Intramicellar Glass Transition and Liquid Dynamics in Soft Confinement
    Physical Review Letters, vol. 92, no. 9, 2004
  34. Dynamics of glass-forming liquids. IX. Structural versus dielectric relaxation in monohydroxy alcohols
    The Journal of Chemical Physics, vol. 121, no. 22, p. 11170, 2004
  35. The Journal of Physical Chemistry B, vol. 108, no. 29, pp. 10451–10456, 2004
  36. The Journal of Physical Chemistry B, vol. 108, no. 51, pp. 19825–19830, 2004
  37. Exponential probe rotation in glass-forming liquids
    The Journal of Chemical Physics, vol. 120, no. 23, p. 11082, 2004
  38. Dynamics of glass-forming liquids. VIII. Dielectric signature of probe rotation and bulk dynamics in branched alkanes
    The Journal of Chemical Physics, vol. 121, no. 18, p. 8960, 2004
  39. Dielectric hole burning in the high frequency wing of supercooled glycerol
    The Journal of Chemical Physics, vol. 118, no. 3, p. 1356, 2003
  40. Dynamics of glass-forming liquids. VII. Dielectric relaxation of supercooled tris-naphthylbenzene, squalane, and decahydroisoquinoline
    The Journal of Chemical Physics, vol. 118, no. 4, p. 1828, 2003
  41. The Journal of Physical Chemistry B, vol. 107, no. 4, pp. 895–898, 2003
  42. Dielectric hole burning in an electrical circuit analog of a dynamically heterogeneous system
    Physica A: Statistical Mechanics and its Applications, vol. 322, pp. 143–154, 2003
  43. Dielectric hole burning: Signature of dielectric and thermal relaxation time heterogeneity
    The Journal of Chemical Physics, vol. 119, no. 12, p. 6150, 2003
  44. Solvation dynamics of molecular glass-forming liquids in confinement
    Journal of Physics: Condensed Matter, vol. 15, no. 11, pp. S1041–S1050, 2003
  45. Solvation dynamics in the plastic crystal and supercooled liquid state of ethanol
    Journal of Physics: Condensed Matter, vol. 15, no. 32, pp. 5429–5438, 2003
  46. Heterogeneous dynamics in liquids: fluctuations in space and time
    Journal of Physics: Condensed Matter, vol. 14, no. 23, pp. R703–R738, 2002
  47. Dynamics of glass-forming liquids. VI. Dielectric relaxation study of neat decahydro-naphthalene
    The Journal of Chemical Physics, vol. 117, no. 9, p. 4414, 2002
  48. Solvation dynamics and probe rotation in glass-forming liquids
    Chemical Physics, vol. 284, no. 1-2, pp. 103–114, 2002
  49. Heterogeneous solvent dynamics and time-resolved optical linewidths
    Journal of Non-Crystalline Solids, vol. 307-310, pp. 50–56, 2002
  50. Observation of heterogeneity in the nanosecond dynamics of a liquid
    The Journal of Chemical Physics, vol. 115, no. 6, p. 2676, 2001
  51. Theory of time dependent optical linewidths in supercooled liquids
    The Journal of Chemical Physics, vol. 114, no. 17, p. 7471, 2001
  52. Spectral diffusion in liquids with fluctuating solvent responses: Dynamical heterogeneity and rate exchange
    The Journal of Chemical Physics, vol. 115, no. 3, p. 1429, 2001
  53. Spectral selectivity in the slow β-relaxation of a molecular glass
    Europhysics Letters (EPL), vol. 54, no. 6, pp. 767–773, 2001
  54. Heterogeneous relaxation patterns in supercooled liquids studied by solvation dynamics
    Physical Review E, vol. 61, no. 2, pp. 1722–1728, 2000
  55. Capacitive scanning dilatometry and frequency-dependent thermal expansion of polymer films
    Physical Review E, vol. 61, no. 2, pp. 1755–1764, 2000
  56. Triplet state solvation dynamics: Basics and applications
    The Journal of Chemical Physics, vol. 113, no. 19, p. 8404, 2000
  57. Scaling vs. Vogel–Fulcher-type structural relaxation in deeply supercooled materials
    Physica A: Statistical Mechanics and its Applications, vol. 287, no. 1-2, pp. 26–36, 2000
  58. Dynamic thermal expansivity near the glass transition
    Journal of Non-Crystalline Solids, vol. 262, no. 1-3, pp. 276–281, 2000
  59. Macromolecules, vol. 32, no. 25, pp. 8551–8559, 1999
  60. Heterogeneous and Homogeneous Diffusivity in an Ion-Conducting Glass
    Physical Review Letters, vol. 83, no. 21, pp. 4337–4340, 1999
  61. Measurement and analysis of time-domain electric field relaxation: The vitreous ionic conductor 0.4?Ca(NO[sub 3])[sub 2]–0.6?KNO[sub 3]
    Journal of Applied Physics, vol. 85, no. 3, p. 1750, 1999
  62. The Journal of Physical Chemistry A, vol. 102, no. 29, pp. 5775–5781, 1998
  63. Dynamics of glass-forming liquids. IV. True activated behavior above 2 GHz in the dielectric a-relaxation of organic liquids
    The Journal of Chemical Physics, vol. 108, no. 15, p. 6408, 1998
  64. Spatial uniformity of the ß-relaxation in ?-sorbitol
    Journal of Non-Crystalline Solids, vol. 242, no. 1, pp. 19–24, 1998
  65. Dynamics of glass-forming liquids. V. On the link between molecular dynamics and configurational entropy
    The Journal of Chemical Physics, vol. 108, no. 21, p. 9016, 1998
  66. The dielectric modulus: relaxation versus retardation
    Solid State Ionics, vol. 105, no. 1-4, pp. 167–173, 1998
  67. Nature of the non-exponential primary relaxation in structural glass-formers probed by dynamically selective experiments
    Journal of Non-Crystalline Solids, vol. 235-237, pp. 1–9, 1998
  68. Molecular dynamics analyzed in terms of continuous measures of dynamic heterogeneity
    Journal of Non-Crystalline Solids, vol. 235-237, pp. 41–47, 1998
  69. Dynamic heterogeneity, spatially distributed stretched-exponential patterns, and transient dispersions in solvation dynamics
    Physical Review E, vol. 58, no. 1, pp. 779–784, 1998
  70. Journal of Physics: Condensed Matter, vol. 9, no. 44, pp. 9661–9671, 1997
  71. Dielectric relaxation of the electric field in poly(vinyl acetate): a time domain study in the range 10-3–106 s
    Polymer, vol. 38, no. 2, pp. 255–261, 1997
  72. Dielectric loss spectra of organic glass formers and Chamberlin cluster model
    Journal of Non-Crystalline Solids, vol. 215, no. 2-3, pp. 293–300, 1997
  73. Thermally stimulated modulus relaxation in polymers: method and interpretation
    Polymer, vol. 38, no. 23, pp. 5801–5806, 1997
  74. The Journal of Physical Chemistry B, vol. 101, no. 33, pp. 6323–6326, 1997
  75. Macromolecules, vol. 30, no. 14, pp. 4038–4041, 1997
  76. Dynamics of glass-forming liquids. III. Comparing the dielectric a- and ß-relaxation of 1-propanol and o-terphenyl
    The Journal of Chemical Physics, vol. 107, no. 4, p. 1086, 1997
  77. A simple current-to-voltage interface for dielectric relaxation measurements in the range 10-3 to 107 Hz
    Review of Scientific Instruments, vol. 67, no. 9, p. 3217, 1996
  78. Geometrical confinement and cooperativity in supercooled liquids studied by solvation dynamics
    Physical Review B, vol. 54, no. 22, pp. 15762–15766, 1996
  79. Donor/acceptor-substituted phenylenevinylenes
    Advanced Materials, vol. 8, no. 11, pp. 932–935, 1996
  80. Macromolecules, vol. 29, no. 4, pp. 1266–1268, 1996
  81. Journal of Physics: Condensed Matter, vol. 8, no. 34, pp. 6185–6190, 1996
  82. Dynamics of solvation in supercooled liquids confined to the pores of sol-gel glasses
    Physical Review B, vol. 53, no. 9, pp. 5341–5347, 1996
  83. Macromolecules, vol. 28, no. 7, pp. 2429–2438, 1995
  84. Journal of Physical Chemistry, vol. 99, no. 47, pp. 17265–17268, 1995
  85. Journal of Physical Chemistry, vol. 99, no. 27, pp. 10948–10951, 1995
  86. Transient polarization four-photon “non-Condon” spectroscopy of electronic transitions in complex molecules
    Journal of Luminescence, vol. 60-61, pp. 709–712, 1994
  87. Homogeneous dispersion of dielectric responses in a simple glass
    Journal of Non-Crystalline Solids, vol. 172-174, pp. 209–213, 1994
  88. Macromolecules, vol. 27, no. 15, pp. 4318–4326, 1994
  89. Journal of Physical Chemistry, vol. 97, no. 13, pp. 3146–3150, 1993
  90. Progress towards processible materials for light-emitting devices using poly(p-phenylphenylenevinylene)
    Advanced Materials, vol. 4, no. 10, pp. 661–662, 1992
  91. Poole-Frenkel behavior of charge transport in organic solids with off-diagonal disorder studied by Monte Carlo simulation
    Synthetic Metals, vol. 37, no. 1-3, pp. 271–281, 1990
  92. Frustrated energy relaxation in an organic glass
    Philosophical Magazine Letters, vol. 59, no. 2, pp. 95–102, 1989
  93. Hopping in a Gaussian distribution of energy states: Transition from dispersive to non-dispersive transport
    Philosophical Magazine Letters, vol. 59, no. 6, pp. 325–331, 1989