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

By Johanna. R Bruckner

In this thesis Johanna Bruckner studies the invention of the lyotropic counterpart of the thermotropic SmC* section, which has develop into well-known because the merely spontaneously polarized, ferroelectric fluid in nature. through 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 said polar electro-optic impact, analogous to the ferroelectric switching of its thermotropic counterpart. The helical floor nation of the mesophase increases the basic query of the way chiral interactions are "communicated" throughout layers of roughly disordered and achiral solvent molecules that are positioned among adjoining bi-layers of the chiral amphiphile molecules. This thesis bridges an enormous hole among thermotropic and lyotropic liquid crystals and pioneers a brand new box of liquid crystal research.

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The so induced current response was recorded with a Cleverscope oscilloscope CS320A and its associated software by using a load resistance RL of 50 Ω, which was negligible compared to the resistance of the cell. Furthermore, the measured signal was averaged 16 times and a low pass filter was employed to enhance the signal’s quality. 2 Measurement of the Switching Time As the brightness of the texture depends on the orientation of the director n with respect to the crossed polarizers, a change from dark to bright can be observed if the SmC* phase or its lyotropic analog are switched from one surface-stabilized state to the other by reversing the direction of the applied electric field (cf.

8 % Sigma-Aldrich a Polyethylene glycol (PEG) is an oligomer or polymer with varying numbers of ethylene glycol units. 1 Materials and Preparation of Samples 31 system, the samples were kept in a thermos-shaker (PST-60 HL plus) at 40 °C for at least 24 h. Even though great care was taken in avoiding solvent evaporation, a certain loss of solvent has to be taken into account due to the preparation process. Nonetheless, this loss should be similar in every sample, causing only a slight absolute but not a relative error.

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