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

By Johanna. R Bruckner

ISBN-10: 3319272020

ISBN-13: 9783319272023

ISBN-10: 3319272039

ISBN-13: 9783319272030

In this thesis Johanna Bruckner reviews the invention of the lyotropic counterpart of the thermotropic SmC* section, which has develop into recognized because the simply spontaneously polarized, ferroelectric fluid in nature. via polarizing optical microscopy, X-ray diffraction and electro-optic experiments she firmly establishes points of the constitution of the unconventional lyotropic liquid crystalline section and elucidates its interesting houses, between them a stated polar electro-optic impact, analogous to the ferroelectric switching of its thermotropic counterpart. The helical flooring nation of the mesophase increases the elemental query of ways chiral interactions are "communicated" throughout layers of kind of disordered and achiral solvent molecules that are situated 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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Extra resources for A First Example of a Lyotropic Smectic C* Analog Phase: Design, Properties and Chirality Effects

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1 is provided in the following subchapters. In principal, the properties and textures of analog phases are also similar due to the equivalent structure of the mesophases and thus are discussed simultaneously. However, the textures of lyotropic liquid crystals often appear less colorful. This is due to the lack of aromatic units in most of the typically used surfactant molecules, as the aromatic cores of thermotropic liquid crystal largely contribute to their birefringence. Exemplary texture images of the discussed thermotropic mesophase are shown in Refs.

While being compressed, drops of the UV-curable adhesive NOA 71 (Norland) were placed at the four corners of the cut glass plates. By capillary forces, the adhesive was sucked in between the two glass plates and thereby encased the substance. For curing of the adhesive, the sample was firstly irradiated with UV light for 5 min and then kept at 50 °C for at least 12 h. Thus, the sample was sealed off from the atmosphere which inhibits solvent evaporation even at elevated temperatures. If a planar alignment of the molecules was needed, a liquid crystal measuring cell either coated with nylon or with polyimide (AWAT, Fig.

To minimize measurement errors this procedure was repeated four times at different positions in the sample. Finally, the obtained values were averaged. 5 Measurement of the Helical Pitch 37 Fig. 5 a Stripe texture of the SmC* phase formed by the thermotropic liquid crystal 4-(2′methylbutyl)-phenyl-4′-n-octyl-biphenyl-4-carboxylate (CE8). By plotting the intensity profile in the highlighted area with the program ImageJ the graph shown in b is obtained. 2 The Cano Method Usually the Cano method [8] is used for chiral nematic liquid crystals.

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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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