By Johanna. R Bruckner
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.
Read Online or Download A First Example of a Lyotropic Smectic C* Analog Phase: Design, Properties and Chirality Effects PDF
Best crystallography books
Crystals and Crystal constructions is an introductory textual content for college kids and others who have to comprehend the topic with out inevitably turning into crystallographers. utilizing the ebook will permit scholars to learn clinical papers and articles describing a crystal constitution or use crystallographic databases with self belief and figuring out.
Figueiredo Neto and Salinas (physics, U. of Sao Paulo) observe that soaps were with us for numerous millennia, and that their use in washing is at once with regards to primary ideas in self- assembling and ordering. As surfactant molecules, they're partially water-soluble and in part oil-soluble. those lyotropic platforms are very good examples of polymorphism and section alterations, looking on their temperature, strain, and different physico-chemical parameters.
Crystallography might be defined because the technology of the constitution of materi als, utilizing this note in its widest experience, and its ramifications are obvious over a extensive entrance of present clinical pastime. it isn't magnificent, for this reason, to discover that almost all universities provide a few features of crystallography of their undergraduate classes within the actual sciences.
The learn of ferroelectricity is a department of reliable country physics which has proven speedy development in the course of the fresh years. Ferroelectric fabrics convey strange electrical homes which lead them to necessary in sleek (opto)electronic expertise, esp. reveal expertise. Ferroelectric and antiferroelectric liquid crystals, together with additionally a variety of polymer kinds, are the most popular examine subject this day in liquid crystals.
- The Basics of Crystallography and Diffraction
- Chemical Crystallography - an Introduction to Optical and X Ray Methods
- Coherent X-Ray Optics
- Crystallography Made Crystal Clear, Third Edition: A Guide for Users of Macromolecular Models (Complementary Science)
- Crystal Structure Refinement: A Crystallographer's Guide to SHELXL (International Union of Crystallography Texts on Crystallography)
Extra resources for A First Example of a Lyotropic Smectic C* Analog Phase: Design, Properties and Chirality Effects
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  is used for chiral nematic liquid crystals.
A First Example of a Lyotropic Smectic C* Analog Phase: Design, Properties and Chirality Effects by Johanna. R Bruckner