By Johanna. R Bruckner
In this thesis Johanna Bruckner studies the invention of the lyotropic counterpart of the thermotropic SmC* part, which has develop into well-known because the purely spontaneously polarized, ferroelectric fluid in nature. via polarizing optical microscopy, X-ray diffraction and electro-optic experiments she firmly establishes features of the constitution of the unconventional lyotropic liquid crystalline section and elucidates its interesting homes, between them a reported polar electro-optic influence, analogous to the ferroelectric switching of its thermotropic counterpart. The helical floor kingdom of the mesophase increases the basic query of the way chiral interactions are "communicated" throughout layers of kind of disordered and achiral solvent molecules that are positioned among adjoining bi-layers of the chiral amphiphile molecules. This thesis bridges an incredible hole among thermotropic and lyotropic liquid crystals and pioneers a brand new box of liquid crystal research.
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Additional info for A First Example of a Lyotropic Smectic C* Analog Phase: Design, Properties and Chirality Effects
The SmC phase basically possesses the same structure as the SmA phase with the difference that the mesogen are on the average tilted by the tilt angle θ with respect to the layer normal k. Hence, the director n is also tilted by θ. The tilt angle increases with decreasing temperature until reaching a saturated value. Typical values for the saturated tilt angle lie between 25° and 35° . If the high temperature phase is a N phase, the phase transition to the SmC phase is usually of 1st order.
D. Dörfler, Grenzflächen und kolloid-disperse Systeme (Springer, Berlin, 2002) 14. A. Blume, K. Hiltrop, K. Kratzat, T. Engels, W. C. Möller-Goymann, in Lyotrope Flüssigkristalle: Grundlagen, Entwicklungen, Anwendungen, ed. by H. Stegemeyer (Steinkopfverlag, Darmstadt, 1999) 15. T. Hyde, in Identiﬁcation of Lyotropic Liquid Crystalline Mesophases, ed. by K. O. J. Schwuger. Handbook of Applied Surface and Colloid Chemistry, vol 2 (Wiley, West Sussex, 2002) 16. Y. Kosaka, T. Kato, T. Uryu, Liq. Cryst.
Liq. Cryst. 165, 85–121 (1988) S. Singh, Phase Transitions 72, 183–209 (2000) 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. Chapter 4 Materials and Experimental Techniques In this chapter the materials as well as the preparation of samples for further investigations will be described. Additionally, experimental techniques for all applied methods will be explained in detail. 1 Materials and Preparation of Samples A series of similar surfactant molecules, which differ only in the length and composition of a linking unit, was investigated.
A First Example of a Lyotropic Smectic C* Analog Phase: Design, Properties and Chirality Effects by Johanna. R Bruckner