Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"Molecular glass"”.
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Perylene Diimide Molecular Glass: Investigations of Charge Transport
A new glass-forming organic semiconductor material was synthesized using a known electron transport material, perylene diimide, and attaching it to a molecular glass in order to allow the material to be solution processed. Devices were made using a simple metal-semiconductor-metal structure and …
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Electron beam lithography of molecular glass resist films prepared by physical vapor deposition
… the synthesis of applicable positive tone molecular glass resist materials was addressed in the third chapter. Finally in the fourth chapter a completely new patterning concept based on the salt formation between a base and the acid of an exposed photoacid generator was established, …
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Dielectric Properties of Molecular Glass Formers; from the Liquid State to the Tunneling Regime
… is to extend the dielectric investigations of molecular glass forming systems down to cryogenic temperatures (2 K), but also to complement previous work above the glass transition temperature Tg. The measurements were performed on systems composed of simple, mostly rigid molecules. Having at …
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Holographic Investigation of Azobenzene-Containing Low-Molecular-Weight Compounds
… relief gratings in azobenzene-containing low-molecular-weight compounds are investigated to obtain a broader understanding of this new class of material. Azobenzene chromophores undergo light-induced trans-cis-trans isomerization cycles leading to a reorientation of the long axis of the …
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The Dynamics of Molecular Glasses Studied by Light Scattering
… work is devoted to studying the dynamics in molecular glass formers applying the light-scattering (LS) technique, in particular tandem Fabry-Perot interferometry which allows to cover the frequency range from 0.3 GHz to 1000 GHz. Chapters 4 to 7 each present, in a self-contained way, …
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Generation of ultrahigh frequency acoustic waves for the characterization of complex materials
… anomalous thermal conductivity of silica glass. Separately, an experiment which utilizes impulsive stimulated thermal scattering is used to measure the anomalous low-temperature thermal conductivity of a molecular glass, glycerol. The results, taken in the context of the aforementioned …
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Studies on Optically Induced DC-Voltage in Thin Film Structures
… was significantly increased by adding a poled molecular-glass film in a capacitor configuration. The resulting device is capable of detecting light below the ITO-bandgap at ambient temperature without any bias voltage. It does not rely on the photoelectric effect, which is at the origin of the …
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Terahertz spectroscopy to explore the role of vibrational dynamics in systems with varying structural order and disorder
… an amorphous matrix of suitable small organic molecular glass formers. Degradation mechanisms catalysed by water clusters, the influence of the solvation shell in solution upon reconstitution, and crystallisation processes are important aspects to consider in this context, and this thesis …
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Study of atomic scale dynamics of glass-forming metallic liquids using neutron scattering experiments and molecular dynamics simulations
Bulk metallic glasses are not the archetypal glass-former due to their large propensity for crystallization. They are characterized by complex multi-body interactions; yet have a simple structure that lacks internal degrees of freedom usually present in prototypical network or molecular …
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Azobenzene-functionalized molecular glasses for holographic applications
… and characterization of azobenzene-containing molecular glasses as well as their application as functional materials in specific holographic experiments. By utilizing a modular design principle, we were able to fine-tune their physical and photo-physical properties and optimize the molecular …
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Study of relaxation processes in simple glass formers by means of 2H NMR spectroscopy
In the present work molecular glass formers were investigated by means of multidimensional 2H NMR (solid echo and 2D spectra, stimulated echo decays, spin-lattice and spin-spin relaxation). We focused our attention on glass forming liquids that were composed of simple, rigid molecules in order to …
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Development of Molecular Glasses for Solvent-Free Photolithography utilizing Combinatorial Vapor Deposition
… with solvent-free film preparation of low molecular weight, amorphous, photosensitive resists by physical vapor deposition (PVD), their subsequent UV exposure through a mask and their development to produce features in the micro- and nanometer range. In the frame of the thesis towards a …
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Primary and Secondary Relaxations in Neat and Binary Glass Formers Studied by Means of Dielectric Spectroscopy
… thesis is the investigation of neat and binary molecular glass formers studied with the help of dielectric spectroscopy (DS). One of two main interests followed by this thesis is to refine the generic picture of the dynamic susceptibility, including the temperature evolution of primary and …