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Dynamical signature of two "ideal glass transitions" in nematic liquid crystals

J. Chem. Phys. 119, 10421 (2003); doi:10.1063/1.1618215

Issue Date: 15 November 2003

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Hu Cang, Jie Li, V. N. Novikov, and M. D. Fayer
Department of Chemistry, Stanford University, Stanford, California 94305
A temperature scaling analysis using the same mode coupling theory (MCT) scaling relationships employed for supercooled liquids is applied to optical heterodyne detected optical Kerr effect data for four liquid crystals. The data cover a range of times from ~1 ps to 100 ns and a range of temperatures from ~50 K above the isotropic to nematic phase transition temperature TNI down to ~TNI. The slowest exponential component of the data obeys the Landau–de Gennes (LdG) theory for the isotropic phase of liquid crystals. However, it is also found that the liquid crystal data obey MCT scaling relationships, but, instead of a single scaling temperature TC as found for supercooled liquids, in the liquid crystals there are two scaling temperatures TCL (L for low temperature) and TCH (H for high temperature). TCH is very close to T*, which results from LdG scaling, just below the isotropic to nematic phase transition temperature, TNI, but is 30–50 K higher than TCL. The liquid crystal time dependent data have the identical functional form as supercooled liquid data, that is, a fast power law decay with temperature independent exponent, followed by a slower power law decay with temperature independent exponent, and on the longest time scales, an exponential decay with highly temperature dependent decay constant. For each liquid crystal, the amplitudes of the two power laws scale with expressions that involve TCL, but the exponential decay time constant (long time dynamics) scales with an expression that involves TCH. The existence of two scaling temperatures can be interpreted as a signature of two "glass transitions" in liquid crystals. In ideal MCT developed for spheres, TC is the "ideal glass transition temperature," although it is found experimentally to be ~20%–30% above the experimental glass transition temperature, Tg. The transition in nematic liquid crystals at TCL corresponds to the conventional ideal MCT glass transition, while the transition at TCH can occur for nonspherical molecules, and may correspond to the freezing in of local nematic order. ©2003 American Institute of Physics.
History: Received 3 June 2003; accepted 20 August 2003
Permalink: http://link.aip.org/link/?JCPSA6/119/10421/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.30.-v
    Liquid crystals
  • 64.70.Md
    Transitions in liquid crystals
  • 64.70.Pf
    Glass transitions
  • 42.65.Hw
    Optical phase conjugation; photorefractive and Kerr effects
  • YEAR: 2003

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ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (75)
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For access to fully linked references, you need to log in. For access to fully linked references, you need to Log in.
  1. E. G. Hanson, Y. R. Shen, and G. K. L. Wong, Phys. Rev. A 14, 1281 (1976).
  2. F. W. Deeg, S. R. Greenfield, J. J. Stankus, V. J. Newell, and M. D. Fayer, J. Chem. Phys. 93, 3503 (1990).
  3. J. J. Stankus, R. Torre, C. D. Marshall, S. R. Greenfield, A. Sengupta, A. Tokmakoff, and M. D. Fayer, Chem. Phys. Lett. 194, 213 (1992).
  4. S. D. Gottke, D. D. Brace, H. Cang, B. Bagchi, and M. D. Fayer, J. Chem. Phys. 116, 360 (2002).
  5. S. D. Gottke, H. Cang, B. Bagchi, and M. D. Fayer, J. Chem. Phys. 116, 6339 (2002).
  6. H. Cang, J. Li, and M. D. Fayer, Chem. Phys. Lett. 366, 82 (2002).
  7. P. G. de Gennes, Phys. Lett. A 30, 454 (1969).
  8. P. G. de Gennes, The Physics of Liquid Crystals (Clarendon, Oxford, 1974).
  9. G. K. L. Wong and Y. R. Shen, Phys. Rev. Lett. 30, 895 (1973).
  10. T. D. Gierke and W. H. Flygare, J. Chem. Phys. 61, 2231 (1974).
  11. T. W. Stinson III and J. D. Litster, Phys. Rev. Lett. 25, 503 (1970).
  12. J. D. Litster and T. W. Stinson III, J. Appl. Phys. 41, 996 (1970).
  13. J. C. Fillippini and Y. Poggi, Phys. Lett. 65A, 30 (1978).
  14. W. H. de Jeu, in Solid State Physics, edited by L. Liebert (Academic, New York, 1978), 109 pp.
  15. H. Kresse, in Advances in Liquid Crystals, edited by G. H. Brown (Academic, New York, 1983), Vol. 6, 109 pp.
  16. W. Götze, J. Phys.: Condens. Matter 11, A1 (1999).
  17. C. A. Angell, Science 267, 1924 (1995).
  18. H. Z. Cummins, G. Li, W. Du, Y. H. Hwang, and G. Q. Shen, Prog. Theor. Phys. 126, 21 (1997).
  19. G. Li, M. Du, A. Sakai, and H. Z. Cummins, Phys. Rev. A 46, 3343 (1992).
  20. G. Li, W. M. Du, X. K. Chen, and H. Z. Cummins, Phys. Rev. A 45, 3867 (1992).
  21. J. Wuttke, M. Kiebel, E. Bartsch, F. Fujara, W. Petry, and H. Sillescu, Z. Phys. B: Condens. Matter 91, 357 (1993).
  22. W. Petry, E. Bartsch, F. Fujara, M. Kiebel, H. Sillescu, and B. Farago, Z. Phys. B: Condens. Matter 83, 175 (1991).
  23. M. Kiebel, E. Bartsch, O. Debus, F. Fujara, W. Petry, and H. Sillescu, Phys. Rev. B 45, 10301 (1992).
  24. W. Steffen, A. Patkowski, H. Gläser, G. Meier, and E. W. Fischer, Phys. Rev. E 49, 2992 (1994).
  25. R. Bergmann, L. Börjesson, L. M. Torell, and A. Fontana, Phys. Rev. B 56, 11619 (1997).
  26. V. Krakoviack, C. Alba-Simionesco, and M. Krauzman, J. Chem. Phys. 107, 3417 (1997).
  27. A. Tölle, H. Schober, J. Wuttke, and F. Fujara, Phys. Rev. E 56, 809 (1997).
  28. P. Lunkenheimer, A. Pimenov, M. Dressel, Y. G. Goncharov, R. Böhmer, and A. Loidl, Phys. Rev. Lett. 77, 318 (1996).
  29. U. Schneider, P. Lunkenheimer, R. Brand, and A. Loidl, Phys. Rev. E 59, 6924 (1999).
  30. A. Arbe, D. Richter, J. Colmenero, and B. Farago, Phys. Rev. E 54, 3853 (1996).
  31. M. Giordano, D. Leponini, and M. Tosi, J. Phys. Condens. Matter 11, A1 (1999).
  32. G. Hinze, D. D. Brace, S. D. Gottke, and M. D. Fayer, J. Chem. Phys. 113, 3723 (2000).
  33. S. D. Gottke, G. Hinze, D. D. Brace, and M. D. Fayer, J. Phys. Chem. B 105, 238 (2001).
  34. D. D. Brace, S. D. Gottke, H. Cang, and M. D. Fayer, J. Chem. Phys. 116, 1598 (2002).
  35. H. Cang, V. N. Novikov, and M. D. Fayer, J. Chem. Phys. 118, 2800 (2003).
  36. R. Torre, P. Bartolini, M. Ricci, and R. M. Pick, Europhys. Lett. 52, 324 (2000).
  37. R. Torre, P. Bartolini, and R. M. Pick, Phys. Rev. E 57, 1912 (1998).
  38. M. D. Ediger, Annu. Rev. Phys. Chem. 51, 99 (2000).
  39. H. Sillescu, J. Non-Cryst. Solids 243, 81 (1999).
  40. W. Kob and H. C. Anderson, Phys. Rev. E 52, 4134 (1995).
  41. S. R. Kudchadkar and J. M. Wiest, J. Chem. Phys. 103, 8566 (1995).
  42. S. Kämmerer, W. Kob, and R. Schilling, Phys. Rev. E 56, 5450 (1997).
  43. S. Kämmerer, W. Kob, and R. Schilling, Phys. Rev. E 58, 2141 (1998).
  44. R. Schilling and T. Scheidsteger, Phys. Rev. E 56, 2932 (1997).
  45. W. Götze and L. Sjögren, Rep. Prog. Phys. 55, 241 (1992).
  46. W. Götze, J. Phys.: Condens. Matter 11, A1 (1999).
  47. W. Götze and M. Sperl, Phys. Rev. E 66, 011405 (2002).
  48. L. Fabbian, W. Götze, F. Sciortino, P. Tartaglia, and F. Thiery, Phys. Rev. E 59, R1347 (1999).
  49. H. Cang, V. N. Novikov, and M. D. Fayer, Phys. Rev. Lett. 90, 197401 (2003).
  50. H. Tanaka, J. Chem. Phys. 111, 3163 (1999).
  51. S. J. Rzoska, M. Paluch, A. Drozd-Rzoska, J. Ziolo, P. Janik, and K. Czuprynski, Eur. Phys. J. E 7, 387 (2002).
  52. M. Letz, R. Schilling, and A. Latz, Phys. Rev. E 62, 5173 (2000).
  53. S. H. Chong and W. Götze, Phys. Rev. E 65, 041503 (2002).
  54. S. H. Chong and W. Götze, Phys. Rev. E 65, 051201 (2002).
  55. H. Cang, L. Jie, V. N. Novikov, and M. D. Fayer, J. Chem. Phys. 118, 9303 (2003).
  56. L. Onsager, Ann. N.Y. Acad. Sci. 8, 627 (1949).
  57. W. Götze, J. Phys.: Condens. Matter 2, 8485 (1990).
  58. W. Götze, Liquids, Freezing and Glass Transition (Elsevier Science, Amsterdam, 1989).
  59. G. Li, G. M. Fuchs, W. M. Du, A. Latz, N. J. Tao, J. Hernandez, W. Götze, and H. Z. Cummins, J. Non-Cryst. Solids 172, 43 (1994).
  60. G. Hinze, D. D. Brace, S. D. Gottke, and M. D. Fayer, Phys. Rev. Lett. 84, 2437 (2000).
  61. L. Fabbian, W. Götze, F. Sciortino, P. Tartaglia, and F. Thiery, Phys. Rev. E 60, 2430 (1999).
  62. J. Bergenholtz and M. Fuchs, Phys. Rev. E 59, 5706 (1999).
  63. K. Dawson, G. Fo, M. Fuchs, W. Götze, F. Sciortino, M. Sperl, P. Tartaglia, T. Voigtmann, and E. Zaccarelli, Phys. Rev. E 63, 011401 (2001).
  64. A. M. Puertas, M. Fuchs, and M. E. Cates, Phys. Rev. Lett. 88, 098301 (2002).
  65. D. McMorrow and W. T. Lotshaw, J. Phys. Chem. 95, 10395 (1991).
  66. D. McMorrow, W. T. Lotshaw, and G. A. Kenney-Wallace, IEEE J. Quantum Electron. 24, 443 (1988).
  67. Y. Kai, S. Kinoshita, M. Yamaguchi, and T. Yagi, J. Mol. Liq. 65-6, 413 (1995).
  68. S. Ravichandran, A. Perera, M. Moreau, and B. Bagchi, J. Chem. Phys. 109, 7349 (1998).
  69. C. Flytzanis and Y. R. Shen, Phys. Rev. Lett. 33, 14 (1974).
  70. F. Stillinger and J. Hodgdon, Phys. Rev. E 50, 2064 (1994).
  71. J. J. Stankus, R. Torre, and M. D. Fayer, J. Phys. Chem. 97, 9478 (1993).
  72. H. Schad and H. R. Zeller, Phys. Rev. A 26, 2940 (1982).
  73. H. R. Zeller, Phys. Rev. Lett. 48, 334 (1982).
  74. V. N. Novikov and A. P. Sokolov, Phys. Rev. E 67, 031507 (2003).
  75. H. Watanabe, T. Sato, M. Hirose, K. Osaki, and M. L. Yao, Rheol. Acta 38, 100 (1999).

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