SNL  Vol.3 No.1 , January 2013
Composite Materials Containing Perfluorinated and Siloxane Units for Vertical Alignment of Liquid Crystals
Abstract: Here we report on the study of vertical alignment of a nematic liquid crystal due to the segregation between perfluorinated and the polysiloxane groups of a multi-component composite alignment material. The measured surface anchoring energy was found to depend on the relative amount of polysiloxane matrix in the composite material. These kind of self-assembly will reduce the preparation time for display by eliminating few steps.
Cite this paper: R. Alla, G. Hegde, L. Komitov, A. Morelli, E. Chiellini and G. Galli, "Composite Materials Containing Perfluorinated and Siloxane Units for Vertical Alignment of Liquid Crystals," Soft Nanoscience Letters, Vol. 3 No. 1, 2013, pp. 11-13. doi: 10.4236/snl.2013.31003.

[1]   J. Cognard, “Alignment of Nematic Liquid Crystals and Their Mixtures,” Molecular Crystals and Liquid Crystals, Supplement Series, Vol. 1, 1982, pp. 1-78.

[2]   V. Fazio, F. Nanneli and L. Komitov, “Sensitive Methods for Estimating the Anchoring Strength of Nematic Liquid Crystals on Langmuir-Blodgett Monolayers of Fatty Acids,” Physical Review E, Vol. 63, 2001, pp. 1-8, Article ID: 061712

[3]   D. K. Yoon, S.-H. Park, E. H. Lee, Y. H. Kim, P. Stenger, J. A. Zasadzinski and H.-T. Jung, ”Surface Ordering of a Perfluorinated Self-Assembled, Dendrimer on a Water Subphase,” Langmuir, Vol. 21, No. 11, 2005, pp. 4989-4995.

[4]   X. F. Li, L. Andruzzi, E. Chiellini, G. Galli, C. K. Ober, A. Hexemer, E. J. Kramer and D. A. Fischer, “Semifluorinated Aromatic Side-Group Polystyrene-Based Block Copolymers: Bulk Structure and Surface Orientation Studies,” Macromolecules, Vol. 35, No. 21, 2002, pp. 8078-8087. doi:10.1021/ma020463k

[5]   D. R. Iyengar, S. M. Perutz, C.-A. Dai, C. K. Ober and E. J. Kramer, “Surface Segregation Studies of Fluorine-Containing Diblock Copolymers,” Macromolecules, Vol. 29, No. 4, 1996, pp. 1229-1234.

[6]   Y. Katano, H. Tomono and T. Nakajima, “Surface Property of Polymer Films with Fluoroalkyl Chains,” Macromolecules, Vol. 27, No. 8, 1994, pp. 2342-2344. doi:10.1021/ma00086a060

[7]   J. Hopken and M. Mdller, “Low-Surface-Energy Polystyrene,” Macromolecules, Vol. 25, No. 5, 1992, pp. 1461-1467. doi:10.1021/ma00031a016

[8]   H. J. Ahn, S. J. Rho, K. C. Kim, J. B. Kim, B. HHwang, C. J. Park and H. K. Baik, “Ion-Beam Induce Liquid Crystal Alignment on Diamond-like Carbon and Fluorinated Diamond-like Carbon Thin Films,” Japanese Journal of Applied Physics, Vol. 44, No. 6A, 2005, pp. 4092-4097. doi:10.1143/JJAP.44.4092

[9]   H. J. Ahn, J. B. Kim, K. C. Kim, B. H. Hwang, J. T. Kim, H. K. Baik, J. S. Park and D. Kang, “Liquid Crystal Pretilt Angle Control Using Adjustable Wetting Properties of Alignment Layers,” Applied Physical Letters, Vol. 90, No. 25, 2007, pp. 253505-253507. doi:10.1063/1.2749843

[10]   T. Imae, T. Takeshita and M. Kato, “Phase Separation in Hybrid Langmuir-Blodgett Films of Perfluorinated and Hydrogenated Amphiphiles. Examination by Atomic Force Microscopy,” Langmuir, Vol. 16, No. 2, 2000, pp. 612-621. doi:10.1021/la9902237

[11]   X. Nie, R. Lu, H. Xianyu, T. X. Wu and S.-T. Wu, “Anchoring Energy and Cell Gap Effects on Liquid Crystal Response Time,” Journal of Applied Physics, Vol. 101, 2007, pp. 1-5.