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 17 of 17 for “"Photoacid"”.
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Visible light-induced pH control and its applications
… patterns influence the acidity of merocyanine photoacids in the dark as well as under light irradiation. The parameters which are crucial for increasing light-induced pH changes are defined and applied to synthesized merocyanine photoacids. The light-induced pH changes starting from varying …
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Ultrafast 2D IR spectroscopy of membrane peptide systems
… by implementing an ultraviolet pump laser to a photoacid-containing sample. Pumping the sample with UV dissociates the photoacid, causing an instantaneous, local pH drop, and the effect on the sample is probed by 2D IR. This new method extends the picosecond-scale 2D IR experiment to a …
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Excited states of chromophores and vibronic interactions
… the ultrafast radiationless decay of the photoacid 3- cyano-6-hydroxycoumarin in relation to the proton transfer to solvent mechanism.</p>
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Novel resist materials for next generation lithography
… resist has been developed via the addition of a photoacid generator and a crosslinker to a fullerene derivative. This thesis work presents a significant extension of the previous work. The resists have undergone comprehensive optimisation, and systematic characterisation of electron beam …
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Towards next-generation degradable polymers via double amplification
… to sunlight, using long-wave UV-sensitive photoacid generators as initiators, and acid amplifiers as the bulk phase. Small-molecule and polymeric acid amplifiers were designed, based on the known acid amplifier structures in the literature. It was found that three of the acid amplifiers …
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Development and applications of acid degradable polymeric materials
… solvent. We demonstrate that by encapsulating a photoacid generator as a trigger, we can increase the internal local acid concentration and degrade these microcapsules using UV light (365 nm). The generation of high localized proton concentration inside the oil core is capable of degrading the …
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Electron beam lithography of molecular glass resist films prepared by physical vapor deposition
… between a base and the acid of an exposed photoacid generator was established, combinatorially optimized and high resolution features were demonstrated. The first chapter of this thesis covers the characterization of the utilized electron beam lithography tool Zeiss Leo1530 equipped with …
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Mesoscale simulation of the photoresist process and hydrogel biosensor array platform indexed by shape
… these calculations led to aggregation of photoacid generator molecules in the photoresist, which was quantified. A serious limitation of mesoscale simulation is relatively long computation times. Thus, several efforts were made to improve the speed of the models. The advances of the …
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PH-responsive polymeric materials for encapsulation and triggered release
… polymerization. Encapsulation of a hydrophobic photoacid generator (PAG) in the core of the microcapsules demonstrated UV-triggered degradation.
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Biofunctionalised Coordination Cages and Quantified Speciation in Supramolecular Mixtures
… transferred to the whole system. Addition of a photoacid generator to the organo-gel formed triggered the reversible gel-sol transition of the material under alternating cycles of light irradiation and darkness. Finally, a water-soluble cage was synthesised using N-acetylatedgalactoamine …
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Investigating New Guaiazulenes and Diketopyrropyrroles for Photonic Applications
… act as sensitizers of a UV-activated (< 300 nm) photoacid generator (PAG), via intermolecular photoinduced electron transfer (PeT), upon which the PAG undergoes photodecomposition resulting in the generation of acid. In a related study, the guaiazulene methyl group at C-4 was employed to study …
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Development and characterization of polyphthalaldehyde for transient applications
… well as thermoforming via hot press molding. A photoacid generator (PAG) was incorporated into cPPA films to generate acid within the film in response to exposure to UV light. Acid cleaved the polymer backbone of cPPA and resulted in solid state depolymerization into the monomer oPA. The …
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Development of Molecular Glasses for Solvent-Free Photolithography utilizing Combinatorial Vapor Deposition
… several components. One of these components, a photoacid generator (PAG), generates acid molecules when exposed to suitable wavelengths. In a post-exposure bake, the formed protons catalytically initiate reactions between the other resist components (chemical amplification). Investigations and …
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Design and synthesis of acid-cleavable monomers for chemically degradable polymeric materials
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01
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Sacrificial polymers for rapid manufacturing of bioinspired vascular materials
… (PPC) templates. PPC containing a latent photoacid generator (PAG) is melt-processed into fibers and filaments near 150 °C, which is easily depolymerized below the extrusion temperature after activating the PAG. This orthogonal trigger approach allows melt-extrusion into mechanically …
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Part I - Access to UV photocured nanostructures via selective morphological trapping of block copolymer melts. Part II - Morphological phase behavior of poly(RTIL) containing block copolymer melts
… into their equivalent solid analogs. Cationic photoacids were combined with partially epoxidized polyisoprene-b-poly(ethylene oxide) (PI-PEO) block copolymers, forming composite blends that allow for extended thermal processing prior to cure, in addition to precise trapping of selected …
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Stimuli-responsive microcapsules for self-protecting and self-healing material systems
… properties are achieved by incorporating a photoacid generator (PAG) additive to the polymeric shell wall. Localized generation of acid leads to acid-catalyzed depolymerization of cPPA. The capsules rapidly release their core material in under a minute with only 30 s of UV exposure. The …