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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 421 to 430 of 2206 (0.026 seconds)Spelling suggestions: "subject:"crystals"" "subject:"3crystals""
| 421 |
Simple and compact device for measuring ultrashort-laser pulsesO'Shea, Patrick 05 1900 (has links)
No description available.
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| 422 |
An investigation of the effect of benzene substitution pattern on the formation of discotic phasesChau, Sotheary 12 1900 (has links)
No description available.
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| 423 |
Polymeric liquid crystals as potential processing aidsPena, Ricardo 05 1900 (has links)
No description available.
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| 424 |
Thermodynamic effects of solute molecular size and shape in liquid crystal and alkane systemsKronberg, Bengt January 1977 (has links)
No description available.
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| 425 |
Dynamic NMR studies of molecular motions and order in calamitic and discotic liquid crystalsZhang, Jing 14 September 2007 (has links)
This dissertation reports a study of three kinds of liquid crystals using modern solid state NMR techniques: chiral rod-like liquid crystals, bent-core mesogens and disc-like liquid crystals.
The properties and structures of liquid crystals are first introduced in Chapter 1. To understand the principles of different NMR phenomena, quantum mechanical theory is adopted to study different nuclear spin interactions and NMR techniques in Chapter 2.
In the next part of this dissertation (Chapter 3-6), deuterium NMR methods are used to investigate the dynamics and structures of some liquid crystal phases.
This is first done using the spin relaxation study. The parameters obtained from the model simulation can describe the molecular motion and internal dynamics in the fast motion region.
Secondly, we investigate the dynamic process of discotic mesophases and unwound smectic C* phase using the line shape simulation study.
2D deuterium NMR exchange experiments are then performed to study the jump process in TGBA* phase and SmC* phase.
The above investigation has demonstrated some powerful NMR methods for the dynamic study of liquid crystals.
The third part of the dissertation (Chapter 7-9) is concerned with C-13 NMR techniques.
After we introduce the quantum theory of different pulse sequences, theoretical models are presented to fit observations such as chemical shifts and dipolar splittings. Moreover high resolution liquid C-13 NMR experiments are introduced to study some bent-core molecules. They are useful to assist the carbon peak assignments of these molecules. The structure and ordering information of liquid crystals can be determined in their mesophases.
Finally, a brief summary of the dissertation is given in the last chapter.
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| 426 |
Synthesis and spinning of a new thermotropic liquid crystallinepolymers : characterization of fiber morphology and mechanical propertiesJenkins, Shawn Eric January 1996 (has links)
No description available.
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| 427 |
Molecular control of liquid crystalline orientation of poly(2,6-benzoxazole)Khamvongsa, Bryan January 1993 (has links)
No description available.
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| 428 |
Synthesis and charaterization of chiral 2-methyl-1,4-cyclohexanedicarboxylic acid and its polyamideLuo, Shijian January 1998 (has links)
No description available.
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| 429 |
The synthesis and characterization of a regularly alternating copolyesterWusik, Martin Joseph January 1988 (has links)
No description available.
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| 430 |
Fatigue crack propagation in single crystal CMSX-2 at elevated temperatureAntolovich, Bruce F. 12 1900 (has links)
No description available.
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