A First Example of a Lyotropic Smectic C* Analog Phase: by Johanna. R Bruckner PDF

By Johanna. R Bruckner

ISBN-10: 3319272020

ISBN-13: 9783319272023

ISBN-10: 3319272039

ISBN-13: 9783319272030

In this thesis Johanna Bruckner stories the invention of the lyotropic counterpart of the thermotropic SmC* part, which has develop into well-known because the basically spontaneously polarized, ferroelectric fluid in nature. by way of polarizing optical microscopy, X-ray diffraction and electro-optic experiments she firmly establishes facets of the constitution of the radical lyotropic liquid crystalline part and elucidates its attention-grabbing homes, between them a mentioned polar electro-optic influence, analogous to the ferroelectric switching of its thermotropic counterpart. The helical floor country of the mesophase increases the elemental query of the way chiral interactions are "communicated" throughout layers of roughly disordered and achiral solvent molecules that are situated among adjoining bi-layers of the chiral amphiphile molecules. This thesis bridges a massive hole among thermotropic and lyotropic liquid crystals and pioneers a brand new box of liquid crystal research.

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Extra info for A First Example of a Lyotropic Smectic C* Analog Phase: Design, Properties and Chirality Effects

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25, 79–94 (1974) F. Hardouin, G. H. F. Achard, J. Phys. Lett. 42, L63–L66 (1981) F. Sigaud, F. R. M. Levelut, J. Phys. 42, 107–111 (1981) F. H. F. M. Levelut, J. Phys. Lett. 43, L327–L331 (1982) H. , in International Tables of Crystallography, vol. A, 5th edn. ed. by T. Hahn (Wiley, 2005) H. Sackmann, Liq. Cryst. 5(1), 43–55 (1989) D. Demus, in Sequence Rule and Reentrant Behavior ed. by H. Stegemeyer. E. Cladis, Phys. Rev. Lett. 35(1), 48–51 (1975) Y. Nishihata, H. Sakashita, H. Terauchi, S. Takenaka, S.

5 a Long-range orientational and positional order as found for a crystal. b Hexatic smectic phase with long-range orientational but only short-range positional order (redrawn after [24]) viscosity can be explained by the all-trans confirmation of the surfactants’ alkyl chains, which is also referred to as ‘frozen’. In some cases, chiral liquid crystals which possess a very strong tendency to segregate into smectic layers and at the same time exhibit a very high twisting power form so-called twist grain boundary phases (TGB) [29].

It is not completely clarified when and why re-entrant phases appear. g. on the basis of frustration, geometric complexity or competing fluctuations [42, 43]. For lyotropic liquid crystals, the temperature plays a secondary role in the formation of the individual mesophases. The primary influence on the phase sequence is exerted by the solvent concentration. The solvent concentration is directly connected to the packing parameter and thus to the micellar shape (cf. Sect. 1), which largely determines the mesophase type.

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A First Example of a Lyotropic Smectic C* Analog Phase: Design, Properties and Chirality Effects by Johanna. R Bruckner

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