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 91 for “"photostability"”.
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Spectrokinetic studies of the photostability and the photodegradation of Diethylstilbestrol
… research purposes on the photodegradation and photostability of the photoactive Diethylstilbestrol compound (DES) a synthetic oestrogen sometimes used in the treatment of specific cancers. Both photochemical and photostability studies were carried out in order to contribute new knowledge to the …
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Mechanistic Studies of the Structure-Photostability Relationship of Organic Conjugated Polymers
… photostable. To study how dependent photostability is on a polymer’s chemical structure and frontier orbital energies, two series of CPs were studied. The first series contained two dicyano-substituted polyphenylenevinylene polymers with different side chains: …
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Study Of The Photodegradation And Photostability Of Anti-Cancer Drugs In Different Media Towards The Development Of Both New Actinometers And Liquid Formulations
… some of the problems often encountered in photostability testing and liquid formulation development. Three anti-cancer drugs will be employed as models; Dacarbazine (DBZ) has well established photostability issues, Axitinib (AXI) and Sunitinib (SUT) are two new drugs only commercially …
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New extended methine dyes for application in laser technology
… none showed RSA properties at 532nm. The poor photostability properties of these dyes prompted the synthesis of related fused ring systems derived from 4-chloro-7-diethylamino-3-formyl-coumarin and in at least one example a marked improvement in photostability was achieved. In an attempt to …
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METAL NANOSTRUCTURES-ENHANCED AIE-BASED PHOTOSENSITIZERS FOR PHOTODYNAMIC THERAPY
… to weak fluorescence at aggregated state, low photostability, and less ROS generation ability. There are two main strategies to enhance the rate of singlet oxygen generation (SOG) and the photostability of the photosensitizers. The first approach is based on the molecular design, where the new …
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Switching hybrid polymers with physically and covalently entrapped organic photochromes
… and low rigidity are preferable in terms of photostability. Significant differences were found for physically incorporated and covalently grafted chromophores. Using silylated dyes that can participate in the sol-gel process, the photodegradation rate of the whole system can be decreased as …
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Advances in single molecule spectroscopy and microscopy for biological imaging and polymer characterization
… strategies designed to increase brightness and photostability. First, we developed fluorescent dendrimer nanoconjugates (FDN) consisting of multiple individual Cy5 dye molecules conjugated to a polymer dendrimer scaffold, which allows for increases in the total brightness of the molecules. In …
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CDSE Quantum Dots and Luminescent/Magnetic Particles for Biological Applications
… [9]. Luminescent quantum dots (QDs) show higher photostability and narrower emission peaks compared to organic fluorophores [8]. The objective of my project was to apply QDs magnetic/luminescent nanoparticle as biological labels in cells. Luminescent CdSe QDs emit bright visible light with high …
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STED-4Pi Microscopy
… at 40-50 nm resolution. A major issue is the photostability of the fluorescent dyes. With the bacterial samples, it can be exemplarily demonstrated that longer depletion pulses increase photostability. An amino-reactive dye, that is stable under STED conditions, enabled the first superresolved …
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Solution-processable, mechanically-flexible lasers
… lasers having low thresholds, high photostability and potential for cost-effectiveness and compact integration. Different gain materials, designs and pump sources are used to improve the performance and capabilities of these lasers. Distributed feedback resonators are chosen due to …
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Synthesis, Characterizations, And Evaluation Of New Reactive Two-photon Absorbing Dyes For Two-photon Excited Fluorescence Imaging Applications
… two-photon absorbing (2PA) properties and high photostability, were prepared and characterized. Contemporary synthetic methods were utilized to prepare target fluorene derivatives expected to be highly fluorescent for fluorescence imaging, and, in particular, exhibit high two-photon absorptivity …
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Photocalorimetry: design, development and test considerations
… build a photocalorimeter capable of carrying out photostability testing in the pharmaceutical industry. A current challenge is to develop methods of testing the photostability of solid materials which are non-invasive, non-destructive and allow real time observations to be made. Calorimetry …
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Synthesis, Monitoring, and Molechanical Action of Light-Driven Motorized Nanomachines
… provide an almost twofold increase in photostability compared to the previous USN versions. By analyzing the rotation of a control molecule, it was demonstrated that the cy5-COT fluorophores do not affect the rotation of the motor. This improvement in photostability will further the …
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Modulated Magnetic Field Effects, Molecular Design, and Indigoids: A Mechanistic Study of Singlet Fission
… for singlet fission due to their superior photostability, high extinction coefficient, and ideal predicted triplet energy. We explore these new, versatile, potential molecular families for their singlet fission capability. Furthermore, we discuss an alternative molecular design principle …
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Development of advanced 3D tissue models and O2 imaging methodologies
… We accessed the toxicity, sensitivity and photostability of the O2-sensitive scaffolds and monitored cell oxygenation following seeding with both PC12 and HCT116 cells. Using TCSPC and PLIM multiplexed with fluorescent markers and fluorescent staining we could non-invasively correlate …
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Design, synthesis and characterization of fluorescent hyperbranched polyglycerols and organic nanoparticles with covalently bound anti-fading agents
… and more photostable than fluorescein. The photostability of the ONPs without AFAs was found to loosely correlate to its brightness. Incorporation of AFAs in the ONPs led to increased stability in some cases.
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Development of Nanoprobes for the Biological Imaging Using Positive Charged Quantum Dots and Upconversion Nanoparticles
… properties such as high photoluminescence, photostability, dual magnetic/optical modality. In this study, biocompatible and stable NPs were developed through the various surface modifications. NPs were functionalized by its conjugation with various molecules including antibody for detection …
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Surface plasmon enhanced fluorescence for biological imaging : from visible to short-wave infrared
… Imaging probes of high emissivity and photostability are the key to achieving fluorescence imaging with high signal-to-background ratio (SBR). One promising approach to developing highly bright and stable imaging probes is through surface plasmon enhanced fluorescence. In the first part …
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Automated small molecule synthesis for accelerated discovery of photo- and electroactive organic materials
… In this thesis, CLT is used to optimize the photostability of light-harvesting organic molecules with donor–acceptor structures. CLT identified critical mechanistic factors such as the role of high-energy triplet state manifolds via automated modular synthesis and characterization of only …
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