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Urbanski, Martin: Nanoparticle doping in nematic liquid crystals. 2013
Inhalt
Introduction
Background
Liquid crystals - The fourth state of matter
The nematic phase
The Frank-Oseen energy
The elastic free energy density
The electric free energy density
Surface interactions and alignment
Physical properties of nematic liquid crystals
Dielectric anisotropy
Birefringence
The Fréedericksz-transition
Static director field distribution under influence of an electric field
Dynamic of field-induced director deformations
Nematic liquid crystals and doping
Size effects of dopants in the nematic phase
Nanoparticles
Microscopy on liquid crystals
Polarizing optical microscopy
Confocal microscopy techniques
Experimentals
Materials
Nanoparticles
Liquid crystalline hosts
Dispersion preparation
Microscopy
Polarizing optical microscopy
Fluorescence confocal microscopy techniques
Phase transition temperatures
Electro-optic characterization
Capacitance measurements
Transmittance measurements
Dynamic measurements
Results and discussion
General observations
Stability and solubility of nanoparticles in dispersions
Phase transition temperatures
Textures and alignment studies
Alignment on untreated glass
Birefringent stripe textures
Alignment in electro-optic test cells
Behavior under the influence of electric fields
Field-induced alignment changes
Reverse switching - Electroconvection via nanoparticle doping
Discussion of electro-optic properties
Conclusions and outlook
Appendix
A. List of symbols
B. List of abbreviations
C. Molecular structures of nematic hosts and dichroic dye
D. Contributions in peer reviewed journals
E. Conference contributions
E1. Oral contributions
E2. Poster contributions
F. Bibliography
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