Journals / Celal Bayar Üniversitesi Fen Bilimleri Dergisi / 2018 / Cilt: 14 - Sayı: 2

Effect of Dopant Structure on Birefringences and Symmetric Tensor Invariants of Lyotropic Nematic Phases

Pages
229–235
Publication Date
2018-06-30
DOI
—
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AI Summary & Key Takeaways

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⚡ TL;DR(Too Long; Didn't Read)

It was found that the dopant molecules with aromatic ring affect the birefringences and symmetric tensor invariants more efficiently than those with straight alkyl chain.

📌 3 Key Takeaways

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Objective & Hypothesis:In this study, we investigated the effect of the dopant structure on the birefringences and the symmetric tensor invariants of lyotropic discotic nematic (ND), calamitic nematic (NC) and biaxial nematic (NB) phases.
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Key Findings & Data:Lyotropic host mixture consisted of potassium laurate (KL)/decanol (DeOH)/water.
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Conclusion & Impact:It was found that the dopant molecules with aromatic ring affect the birefringences and symmetric tensor invariants more efficiently than those with straight alkyl chain.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Lyotropic liquid crystals · nematic phases · birefringences

Abstract

In this study, we investigated the effect of the dopant structure on the birefringences and the symmetric tensor invariants of lyotropic discotic nematic (ND), calamitic nematic (NC) and biaxial nematic (NB) phases. Lyotropic host mixture consisted of potassium laurate (KL)/decanol (DeOH)/water. Some dopant molecules were added to this host mixture to obtain quaternary mixtures and to investigate the nematic phase properties by polarizing optical microscopy and laser conoscopy. It was found that the dopant molecules with aromatic ring affect the birefringences and symmetric tensor invariants more efficiently than those with straight alkyl chain.

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Cite This Article

AKPINAR, E. (2018). Effect of Dopant Structure on Birefringences and Symmetric Tensor Invariants of Lyotropic Nematic Phases. Celal Bayar Üniversitesi Fen Bilimleri Dergisi, Cilt: 14 - Sayı: 2, 229–235. https://ajindex.com/articles/108810

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References (14)

  1. Akpinar, E, Reis, D, Neto, A.M.F, Effect of alkyl chain length of alcohols on nematic uniaxial-to-biaxial phase transitions in a potassium laurate/alcohol/K2SO4/water lyotropic mixture, Liquid Crystals, 2012, 39 (7), 881–888
  2. Neto, A.M.F, Galerne, Y, Levelut, A.M, Liebert, L, Pseudo-lamellar ordering in uniaxial and biaxial lyotropic nematics: A synchrotron X-ray diffraction experiment, Journal de Physique Lettres, 1985, 46 (11), 409-506
  3. Galerne, Y, Neto, A.M.F, Liébert, L, Microscopical structure of the uniaxial and biaxial lyotropic nematics, Journal of Chemical Physics, 1987, 87 (3), 1851–1856
  4. Akpinar, E, Reis, D, Yildirim, M, Neto, A.M.F, New lyotropic mixtures with non-chiral N-acylamino acid surfactants presenting the biaxial nematic phase investigated by laser conoscopy, polarized optical microscopy and X-ray diffraction, Materials, 2014, 7 (6), 4132–4147
  5. Lavrentovich, O.D, Looking at the world through liquid crystal glasses, Contemporary Mathematics, 2012, 577, 25-45
  6. Lawson, K.D, Flautt, T.J, Magnetically oriented lyotropic liquid crystalline phases, Journal of American Chemical Society, 1967, 89, 5489– 5491
  7. Rosevear, F.B, The mesomorphic phases of surfactant compositions, Journal of the Society of Cosmetic Chemists, 1968, 19, 581–594
  8. Yu, L.J, Saupe, A, Observation of a biaxial nematic phase in potassium laurate-1-decanol-water mixtures, Physical Review Letters, 1980, 45, 1000–1003
  9. Akpinar, E, Reis, D, Neto, A.M.F, Effect of Hofmeister anions on the existence of the biaxial nematic phase in lyotropic mixtures of dodecyltrimethylammonium bromide/sodium salt/1-dodecanol/water, Liquid Crystals, 2015, 42 (7), 973–981
  10. Galerne, Y, Marcerou, J.P, Temperature behavior of the order-parameter invariants in the uniaxial and biaxial nematic phases of a lyotropic liquid crystal, Physical Review Letters, 1983, 51, 2109–2111
  11. Freiser, M.J, Ordered states of a nematic liquid. Physical Review Letters, 1970, 24, 1041–1043
  12. Alben, R, Phase transitions in a fluid of biaxial particles. Physical Review Letters, 1973, 30, 778–781
  13. Shih, C.S, Alben, R, Lattice model for biaxial liquid crystals, Journal of Chemical Physics, 1972, 57, 3055-3061. 14. de Gennes, P.G, Prost, J, The physics of liquid crystals, Clarendon Press: Oxford, UK, 1993. Chapter 1
  14. Neto, A.M.F, Salinas, S.R.A, The physics of lyotropic liquid crystals: phase transitions and structural properties, Oxford University Press: Oxford, UK, 2005, p 24