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 20 of 81 for “"azobenzene"”.
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Azobenzene-functionalized molecular glasses for holographic applications
… chromophores utilized in holography are azobenzene compounds. Owing to the rich photochemistry of these chromophores, materials incorporating azobenzenes can be used as photoswitches, allowing fast and reversible control over the chemical, physical or optical properties of the entire …
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Interaction of azobenzene containing surfactants with plasmonic nanoparticles
… and cationic surfactants containing azobenzene units in their hydrophobic tail, employing absorption spectroscopy, surface zeta-potential, and electron microscopy. In the first part of the thesis, the formation of complexes between negatively charged laser ablated spherical gold …
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Synthesis and Characterisation of Photoresponsive Azobenzene-Biomolecule Conjugates
… molecular switches with a focus on the field of azobenzene switches, their isomerisation mechanisms and their value as control units on biological molecules. The introductory chapter is followed three synthesis chapters reporting on the application of copper promoted azide alkyne and uncatalysed …
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Understanding and engineering azobenzene for thermal energy storage
… and engineering of a molecule known as azobenzene which holds unique properties for thermal storage applications. The azobenzene molecule undergoes structural change into a metastable state which has the ability to store energy. This thesis utilizes the energy storage and structural …
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Holographic Investigation of Azobenzene-Containing Low-Molecular-Weight Compounds
… volume and surface 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 …
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Self-Assembly of Azobenzene Photosurfactants and the Relationship with Macroscopic Properties
Azobenzene photosurfactants (AzoPS) demonstrate the combined ability to change their shape upon irradiation with light and to self-organise into polymolecular assemblies. Photoisomerisation changes the polarity and shape of the surfactant on demand, which has led to the exploration of these …
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Azobenzene, Diphenylacetylene and Aromatic Nitrogen Heterocycles Coordinated to Early Transition Metal Metallocenes
The structures of titanocene(azobenzene) (I), vanadocene(azobenzene) (II), vanadocene(diphenylacetylene) (III) and molybdenocene(diphenylacetylene) (IV) were determined using X-ray crystallography.
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Novel effects in light-actuated systems based on dispersed azobenzene dyes and azopolymers
In this thesis we explore soft polymeric materials that can be steered by light – quite literally. Through illumination in suitable settings, these materials cannot only be modulated for example in terms of softness, but they can be brought to physically deform, meaning they change shape. The …
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Surface Relief Grating on Thin Film Containing Azobenzene-Polymer Material Linked by Hydrogen-Bonding
Thin films of azobenzene-polymer material show unique photo-responsive behavior under irradiation with two interfering laser beams. That leads to generate surface inscription pattering known as Surface Relief Grating (SRG). Moreover, two different types of polymers were used in this research, and …
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Thermal cis-trans isomerization of azobenzene studied by path sampling and QM/MM stochastic dynamics
Azobenzene-based molecular photoswitches have extensively been applied to biological systems, involving photo-control of peptides, lipids and nucleic acids. The isomerization between the stable trans and the metastable cis state of the azo moieties leads to pronounced changes in shape and other …
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Hierarchical Supramolecular Assemblies Based on Host-Guest Chemistry between Cucurbit[n]uril and Azobenzene Derivatives
… to \textit{cis} isomerisation property, azobenzene (Azo) derivatives have been widely employed in several host-guest systems, leading to various light-responsive materials. This thesis focuses on CB[8]-based ternary complexes, especially those involving Azo derivatives. These systems can …
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All-Optically Addressed Spatial Light Modulator and Diffractive Optical Element Based on Photoalignment of Azobenzene Polymer
… crystal (LC) under the photoalignment of PAZO azobenzene. Leveraging this novel photoalignment technique, the research demonstrates repeatable information recording and holographic display capabilities with high phase modulation resolution, sub-wavelength pixel sizes, ultra-wide viewing angles, …
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First Principles Studies of Cis-Trans Photoisomerization Dynamics and Excited States in Ethylene, Stilbene, Azobenzene and TATB
In principle, the energy required for electronic excitation may also arise from collisions with one or more nearby molecules. One might suggest an importance of electronic excitation in chemical processes at high temperatures and pressures, such as detonation. This possibility was tested in solid …
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Computational study on controlling the optical properties of solar thermal fuels
… hybrid system, e.g. functionalized azobenzene, a well-known photoisomer molecule, attached to carbon nanostructure templates such as carbon nanotubes, graphene, pentacene or alkene chains. Such structures have been suggested and tested as candidate solar thermal fuel materials with …
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The synthesis and in vivo evaluation of chemically modified siRNAs that contain red-shifted internal azobenzene derivative spacers for selective and tunable photocontrol of activity without UV light
… dissertation investigated the incorporation of azobenzene derivative spacers into RNA backbones by replacing two base pairs. Several siRNAs were synthesized, and then characterized bio-physically through several means. After bio-physical characterization, these siRNAs were tested in vitro …
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The synthesis and in vitro evaluation of chemically modified siRNAs that contain internal azobenzene derivative spacers for selective and tunable photocontrol of activity
… This study investigated the incorporation of azobenzene derivative spacers into the RNA backbone replacing 2 base pairs. A small library of siRNAs were synthesized and then characterized bio-physically through several means. After bio-physical characterization, these siRNAs were tested in …
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Aqueous reactions of ozone with primary aromatic amines
… by GC/MS were nitrosobenzenes, nitrobenzenes, azobenzenes, azoxybenzenes, benzidines, aminodiphenylamines, and phenazines. The N-substituted polyaromatic compounds (NPACs), azobenzenes, azoxybenzenes, and benzidines, were the products of interest because of their potential toxicity. When the …
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Enhancing thermal isomerization rates of redox auxiliary-appended azobenzenes via redox auxiliary catalysis
Azobenzene exists in E or Z isomeric forms having different three-dimensional structures, chemical properties, optical properties and electronic properties. Azobenzene can switch between E and Z conformations using light and has been incorporated in chemical systems to impart photoswitchable …
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A new class of photoresponsive surfactants
… groups, coupled through an ether linkage to an azobenzene moiety, were synthesized and developed. Structural changes associated with the interconversion of the azobenzene group between its cis and trans forms as mediated by the wavelength of an irradiating light source, cause changes in the …
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Control of molecular geometries using new photo-electro-switchable azobenzenes
There has been a recent growing interest in azobenzene derivatives because of their ability to isomerize when visible light is absorbed. This unique property allows azobenzenes to undergo reversible conformation change between the trans and cis forms upon absorbing light and slowly thermally …
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