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 56 for “"Organic Dyes"”.
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Three-photon Absorption Process In Organic Dyes Enhanced By Surface Plasmon Resonance
… (3PA) process has been proposed. However, 3PA in organic molecules has a disadvantage, typical values of σ3' are small (10-81 cm6s2/photon2), therefore, 3PA excitation requires high irradiances to induce the promotion of electrons from the ground state to the final excited state. To overcome this …
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Tailored diketopyrrolopyrrole-based organic dyes in photoelectrochemical cells for solar fuel synthesis
… as an alternative to precious metal-based dyes on dye-sensitised photoelectrodes. Firstly, the synthesis of a dyad photocatalyst consisting of a DPP chromophore and ruthenium-based water oxidation catalyst is described. The dyad features suitable light absorption in the visible region and …
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DENSITY FUNCTIONAL THEORY STUDIES OF PHOTOINDUCED ELECTRON EXCITATION AND TRANSFER OF ORGANIC DYES FOR PHOTODYNAMIC THERAPY, SOLAR CELLS, AND FLUORESCENCE SENSOR APPLICATIONS
… here is to understand photophysical processes of organic dyes and to design better organic molecules/systems which can be applied in many applications such as solar cells, photodynamic therapy, and fluorescence sensors. Developments of novel multichromophore organic materials for the above …
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Development of New Computational Approaches to Predict the UV-Vis Behavior of Charge Transfer Organic Dyes and Application to Novel Silole Containing Dyes
… durable, and use low toxicity components. Dyes used for DSC's often exhibit charge transfer character upon absorption of light. Predicting dye behavior in charge transfer cases has been difficult using the current computational methods and an accurate method is needed. Presented here are …
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Near-Infrared High Efficiency Organic Dye Sensitized Solar Cells (DSCs) and Biological Fluorescent Imaging Dyes
… efforts to design and synthesize near-infrared organic dyes to apply to two systems: first, for use in the improvement of DSCs by the optimization of electron rich components such as ullazine and cross-conjugated -bridges to increase photon-to-electricity conversion and second, as a way to …
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Novel Bio-Imaging Techniques Based on Molecular Switching
… the first triplet state of fluorescent organic dyes with the fluorescence process to produce fluorescence emission with unexpected phase advance compared with the excitation light, that reflects the real-time information of organic dyes' dark states. The last three techniques all harness …
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Investigation on Light-driven Photocatalyst-based Materials for Wastewater Cleaning and Environmental Remediation
… of methyl orange (MO) and rhodamine B (RhB) organic dyes. The effects of pH values and stabilities on photocatalytic performance are studied as well. The results reveal that the tube-like Ag3PO4 exhibits greatly high activities for the degradation of RhB solution under acidic condition. The …
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Nanostructured Materials Prepared With Ultrasound
… has proven to be an excellent method to produce organic-inorganic hybrid materials. Nanoporous silica spheres incorporated with various organic dyes are synthesized by USP and utilized in colorimetric sensing arrays for the identification of aliphatic amines. Further usefulness of USP is …
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Novel dopants for n-type doping of electron transport materials: cationic dyes and their bases
… microelectronics became possible. Unlike inorganic semiconductors, organic dyes are up to now usually prepared in a nominally undoped form. However, controlled and stable doping is desirable in many organic-based devices as well. If we succeed in shifting the Fermi level towards the …
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Removal of organic pollutants present in water using inorganic-organic Hybrid Multifunctional Nanocomposites
… were synthesised for the removal of organic dye pollutants from contaminated water samples. Nanocomposites were functionalised to remove dyes via adsorption, photocatalytic breakdown and separation of the nanocomposites from water by simple magnetism. Two types of nanocomposites were …
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Organic materials for second-order nonlinear optics: Approaches to optimizing and stabilizing nonlinear optical effects
… between chemical structure and properties of organic materials. Using properly constructed molecules or photoactive dopants, phenomena such as molecular relaxation, dipolar ordering, poling dynamics, and intermolecular forces in organic materials were investigated. A second objective has been …
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Fluorescent silicon nanocrystals for bioimaging
Quantum dots have been used as alternatives to organic dyes for fluorescence imaging because they are resistant to photobleaching, exhibit strong response to two-photon excitation, and can be conjugated to a wide variety of targeting molecules. Silicon (Si) nanocrystal quantum dots in particular …
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Super-resolution imaging of glutamate receptors in cultured hippocampal neurons under basal and LTP conditions
… are widely used in the literature; the other is organic dyes, which together with its necessary binding protein, are ~ 4 nm in diameter. We find that organic dyes are superior to bQDs because organic dyes have better access to synapses, which itself is only 20-25 nm across, due to their smaller …
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Rational design of hybrid organic solar cells
… present a novel design for a nano-structured organic-inorganic hybrid photovoltaic material that will address current challenges in bulk heterojunction (BHJ) organic-based solar cell materials. Utilizing first principles Density Functional Theory (DFT), we show that layered inorganic …
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Investigation into the use of surface-enhanced Raman spectroscopy (SERS) for organic dye analysis
… been developed for the identification of yellow organic dyes from 18th century Japanese Woodblock prints. Several SERS spectra of nine dyes both in solution and applied on artist paper have also been documented in hopes of assisting with pigment identification in the future.
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Cellulose-metal organic framework nanocomposite adsorbent films for water remediation
… of adsorbent films for the adsorptive removal of organic dyes, particularly methylene blue (MB) from aqueous solutions. The adsorbent films consist of solvothermally synthesized metal-organic framework (MOF)/crystalline nanocellulose (CNC) composites, supported on a cellulose acetate (CA) …
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Nanoparticles from microalgae for environmental and biomedical applications
… demonstrating significant efficiency in removing organic dyes from wastewater and addressing water pollution concerns. Overall, the findings suggest the potential of microalgae-derived nanoparticles for versatile and environmentally friendly applications.
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Intracellular labeling of live cells via transient membrane permeabilization for fluorescence and super resolution microscopy
… a variety of fluorescent probes; ranging from organic dyes (<1 kDa in size) to fluorescent immunoglobulin antibody (~150 kDa) for specific labeling of intracellular proteins. We demonstrate in numerous ways that after permeabilization the cells remained viable and responded normally to cell …
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Pressure Driven Desalination Utilizing Nanomaterials
… increase of flux rate and rejection rate for the organic dyes. Amyloid fibrils also provide structural assistance to the hybrid membrane, which supresses cracking and instability of graphene oxide sheets. The second project is to fabricate polymer nanocomposite membranes with carbon nanotubes …
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The synthesis of inorganic semiconductor nanocrystalline materials for the purpose of creating hybrid organic/inorganic light-emitting devices
… stable overtime to photobleaching compared to organic dyes. Their emission is efficient and their spectral full width at half maximum remains highly narrow as their size is synthetically changed to provide desired peak wavelengths of emission to within plus or minus a couple of nanometers. They …
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