Session V21: Liquid Crystals II: Nano & Bio

11:15 AM–2:15 PM, Thursday, March 16, 2006
Baltimore Convention Center Room: 318

Sponsoring Unit: DFD
Chair: P. A. Heiney, University of Pennsylvania

Abstract ID: BAPS.2006.MAR.V21.9

Abstract: V21.00009 : Adding Mono- and Multivalent Ions to Lyotropic Chromonic Liquid Crystals

12:51 PM–1:03 PM

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Authors:

  Luana Tortora
  Heung-Shik Park
  Kelly Antion
  Chris Woolwerton
  Daniele Finotello
  Oleg Lavrentovich
    (Kent State University)

Lyotropic Chromonic Liquid Crystals (LCLCs) are a distinct class of liquid crystals formed in aqueous solutions by molecules with rigid polyaromatic cores and ionic groups at the periphery [1-4]. The phase diagrams of these materials should depend on entropic factors (as in the Onsager model) and electrostatic interactions. Using optical polarizing microscopy, we studied the effects of mono- and multivalent ions on the phase diagrams of Blue 27 [3] and Sunset Yellow [2]. The monovalent ions change the temperatures of phase transitions, as described in [4], while the effect of multivalent ions is more dramatic and, in addition to the changed temperatures of phase transitions by tens of degrees, it often involves condensation of LCLC aggregates into domains with birefringence much higher than that in a normal nematic phase. Work supported by OBR B-7844. [1]J. Lydon, \textit{Current Opin. Colloid {\&} Interface Sci.} \textbf{3}, 458 (1998);\textbf{8}, 480-489 (2004); [2]V. R. Horowitz, L. A. Janowitz, A. L. Modic, P. J. Heiney, and P. J. Collings, 2005, \textit{Phys. Rew. E} \textbf{72}, 041710; [3]Yu. A. Nastishin, H. Liu, T. Schneider, T., V. Nazarenko, R. Vasyuta, S. V. Shiyanovskii, and O. D. Lavrentovich, 2005, \textit{Phys. Rev. E} \textbf{72}, 041711; [4]A.F. Kostko, B. H. Cipriano, O. A. Pinchuk, L. Ziserman, M. A. Anisimov, D. Danino, and S. R. Raghavan. J. Phys. Chem. B \textbf{109}, 19126-19133 (2005)

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.V21.9